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Comments to date: 8. Page 1 of 1. Average Rating:
dan 9:32am on Sunday, September 12th, 2010 
"Well, after using fm mods i decided that it was time to move on and buy something else. i had 2 choices 1. "This is my 3rd tape adapter for my iPod - first was Monster Cable, then Dynex (?) - which was the worst, and now this Sony one.
andrea05 5:25pm on Sunday, September 5th, 2010 
The only issue that I have found is that the rubber ear buds can compress at times - I simply pull them back out, but it can be anoying at times.
FlipstartJim 2:07pm on Tuesday, August 31st, 2010 
Hello Bargain Hunters! lightweight, great sound, wide range, comfy none Placement of the headset in the ear of the Creative EP630 with coverage from rubber provide a fantastic experience audio in MP3 format.
joegaber 6:41pm on Tuesday, August 17th, 2010 
Creative EP-830 Noise Isolating Earphones Very disappointed with these earphones, i bought them off the back of very good reviews i had read.
fonty 12:13pm on Monday, July 12th, 2010 
The silicone fittings are changeable so you can choose the right size for your ears. Bad thing about that is that they tend to fall off now and then.
mr.potato 10:08am on Saturday, July 3rd, 2010 
Sound quality??? After reading other review I am extremely surprised at what I am listening to. Amazing Creative EP-630 In-Ear Noise-Isolating Headphones (Black) I got a pair of these when I ordered my XPS computer system back in 2008.
wesc 8:55am on Tuesday, June 15th, 2010 
I use this in my 1998 car with a tape deck to connect my ipod. I find the fm transmitters annoying, and unreliable. This is much simpler. It was fast fun and easy. Stuck the cassette in plug in my MP3 player and listen to good quality music with no static. Easy Setup","Good Quality".
xhazerdusx 11:56am on Tuesday, April 27th, 2010 
My first IEM were "Koss Spark Plug" ( 2 pairs ) and I thought they were good, but after trying EP-630 I forgot "Plugs" like a horrible nightmare. These came with my Dell XPS 1530 and I tried them for the first time and really was impressed.

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




Product Review Column from QST Magazine
July 1999 ICOM IC-706MKIIG HF/VHF/UHF Transceiver The AOR AR7000B Wide Range Communications Receiver
Copyright 1999 by the American Radio Relay League Inc. All rights reserved.

Product Review

Edited by Joe Bottiglieri, AA1GW Assistant Technical Editor
By Rick Lindquist, N1RL Senior News Editor Recently I was scanning the automobile adsa vain exercise in wishful thinking when I spotted a writeup for the latest model of my current vehicle. Some of the features of the 1999 model were exactly the ones Id often wished my car possessed. My vehicle was the first of its line, however. This got me thinking about the time I bought my first 2-meter all-mode transceiver back when I was active on the satellites. It was a fine little transceiver, and I only recently parted company with it. But I never quite got over the fact that not six months after Id bought my latest and greatest radio, the manufacturer came out with a new and improved version that incorporated all the features Id come to wish that my rig had. By now it should come as no surprise that I own an original IC-706 transceiver. We original owners have become greener with envy with each incarnation of the IC-706 line. Some have happily traded up. Since the original debuted in 1995 to the oohs and aahs of the Amateur Radio community, ICOM has continued to up the ante (but not the price) almost each succeeding year, almost like model years in the auto industry. But while the Amateur Radio industry is not like the auto industry, ICOM has distinguished itself in recent years by trumping its own aces and by correcting in subsequent models shortcomings that we have revealed during the course of our product reviews. Getting yet another look at this hugely popular model gave us the opportunity to dig a bit more deeply into the basic unit, and to see how the various enhancements over the subsequent two models have made the IC-706 a better radio. So, it is trade-in time again? Lets see what the IC-706MKIIG brings to the table.

Whats New, Pussycat?

The primary new features of the MKIIG are the addition of the 70-cm band, the inclusion of DSP, and more power50 Won 2 meters (history buffs will recall the original 706 put out 10 W on 2, the MKII 20 W). Yes, there are some other features that some users will consider significant or important, but for most folks, these are the big three. Well get to the others in due course. They are largely incremental improvements, however. DSP was an approximately $150 option in the initial MKII. Now, its standard. If for nothing other than competitive reasons, this was a wise move on ICOMs part. We
recently praised the Yaesu FT-100 for having superb DSP featuresincluding the ability to digitally tailor your transmit audio on SSBsomething you wont find on the MKIIG. The DSP features on the IC-706MKIIG are not quite as rich, but they are competent as far as they go. The DSP menu offers two primary features: noise reduction and an autonotch filter to zap heterodynes while operating SSB. The IC-706MKIIG lets you adjust the level of noise reduction you prefer. While overall noise reduction was measured in the vicinity of 10 dB, as with the FT-100 we found a bit of rolloff at the high end plus a substantial amount of frequency ripple. With the NR cranked up full tilt boogie on SSB, the digital processing noise becomes much more apparenteven annoying at times. But, it might very well be far less

Bottom Line

With the addition of yet another band (70 cm), more power on 2 meters and the incremental improvements made with each new version of this popular transceiver, perhaps the 706 has reached its zenith. Theres not much left to improve.

annoying than the noise youre trying to reduce, so its one of those trade-offs. One characteristic where the DSP in the 706 excels is the autonotch. Lab measurements revealed a notch depth for a single tone at greater than 50 dB. This is considerably better than the 20 dB notch depth on the FT-100. Something new for FM-lovers: The MKIIG lets you set the automatic splits for repeater operation for HF, 50, 144 and 430 MHz, a real plus for repeater users. These settings are part of the initial set mode menu. This split is the one youll get when you press the DUP button in FM mode. The IC-706MKIIG knows the split direction too, depending upon the band segment. The MKIIG also includes tone scan capabilitysomething thats optional in the nearest competitor, the FT-100. The Instruction Manual is a little unclear about this, but you have to be in repeater mode and have TON enabled. The SWR Graph mode is a new and potentially useful feature that generates a little graphic representation of your SWR over a selectable range of HF or 6-meter frequencies. The menu lets you set the number of sample points to graph (3, 5, 7 or 9) and the step size between each point (10, 50, 100 or 500 kHz). The resulting graph is a set of vertical bars. The number of bars correFrom July 199 QST ARRL
Table 1 ICOM IC-706MKIIG, serial number 01674
Manufacturers Claimed Specifications Frequency coverage: Receive, 0.03-200, 400-470 MHz; transmit, 1.8-2, 3.5-4, 7-7.3, 10.1-10.15, 14-14.35, 18.068-18.168, 21-21.45, 24.89-24.99, 28-29.7, 50-54, 144-148, 430-450 MHz. Power requirement: Receive, 2.0 A; transmit, 20 A. Modes of operation: SSB, CW, AM, FM, AFSK, WFM (WFM receive only). Receiver SSB/CW sensitivity, bandwidth not specified, 10 dB S/N: 1.8-30 MHz, <0.15 V; 50-54 MHz, <0.12 V; 144-148, 430-450 MHz, <0.11 V. Measured in the ARRL Lab Receive, as specified; transmit 1.8-2, 3.5-4.1, 6.9-7.5, 9.9-10.5, 13.9-14.5, 17.9-18.5, 20.9-21.5, 24.4-25.1, 28-30, 50-54, 144-148, 430-450 MHz.
Receive, 1.4 A; transmit, 21 A. Tested at 13.8 V. As specified.
AM sensitivity, 10 dB S/N: 0.3-1.8 MHz, <13 V; 1.8-30 MHz, <2 V; 50-54,144-148, 430-450 MHz, <1 V.
FM sensitivity, 12 dB SINAD: 28-30 MHz, <0.5 V; 50-54 MHz, <0.25 V; 144-148, 430-450 MHz, <0.18 V.
Blocking dynamic range: Not specified.
Two-tone, third-order IMD dynamic range: Not specified.

Third-order intercept: Not specified.
Second-order intercept: Not specified.
Receiver Dynamic Testing Noise floor (mds), 500-Hz filter: Preamp off Preamp on 1.0 MHz 124 dBm 130 dBm 3.5 MHz 137 dBm 142 dBm 14 MHz 136 dBm 142 dBm 50 MHz 139 dBm 142 dBm 144 MHz 138 dBm 142 dBm 432 MHz 138 dBm 143 dBm 10 dB (S+N)/N, 1-kHz tone, 30% modulation: Preamp off Preamp on 1.0 MHz 3.3 V 1.7 V 3.8 MHz 0.68 V 0.44 V 50 MHz 0.25 V 0.21 V 120 MHz 0.91 V 0.39 V 144 MHz 0.68 V 0.39 V 432 MHz 0.67 V 0.37 V For 12 dB SINAD: Preamp off Preamp on 29 MHz 0.39 V 0.20 V 52 MHz 0.25 V 0.17 V 146 MHz 0.29 V 0.16 V 440 MHz 0.29 V 0.16 V Blocking dynamic range, 500-Hz filter: Preamp off Preamp on 3.5 MHz 125 dB 118 dB 14 MHz 122 dB* 120 dB* 50 MHz 116 dB* 112 dB* 144 MHz 111 dB* 101 dB* 432 MHz 109 dB* 106 dB* Two-tone, third-order IMD dynamic range, 500-Hz filter: Preamp off Preamp on 3.5 MHz 89 dB 87 dB 14 MHz 89 dB 86 dB 50 MHz 89 dB 82 dB 144 MHz 88 dB* 83 dB 432 MHz 85 dB 82 dB Preamp off Preamp on 3.5 MHz 3.4 dBm 13 dBm 14 MHz 1.3 dBm 11 dBm 50 MHz 4.9 dBm 15 dBm 144 MHz 3.0 dBm 16 dBm 432 MHz 8.7 dBm 18 dBm Preamp off, +36.4 dBm; preamp on, +38.5 dBm.
Reference Level: 0 dB PEP

4 Frequency Offset (kHz)

Figure 1Worst-case HF spectral display of the IC-706MKIIG transmitter during twotone intermodulation distortion (IMD) testing. The worst-case third-order product is approximately 30 dB below PEP output, and the worst-case fifth-order product is down approximately 33 dB. The transceiver was being operated at 100 W PEP output at 21.25 MHz.
Figure 2Worst-case VHF/UHF spectral display of the IC-706MKIIG transmitter during two-tone intermodulation distortion (IMD) testing. The worst-case third-order product is approximately 25 dB below PEP output, and the worst-case fifth-order product is down approximately 40 dB. The transceiver was being operated at 50 W PEP output at 144.2 MHz.
Figure 3CW keying waveform for the IC-706MKIIG showing the first two dits in fullbreak-in (QSK) mode using external keying. Equivalent keying speed is approximately 60 wpm. The upper trace is the actual key closure; the lower trace is the RF envelope. Horizontal divisions are 10 ms. The transceiver was being operated at 100 W output at 14.2 MHz. Note the considerable shortening of both dits.

From July 199 QST ARRL

Manufacturers Claimed Specifications
FM adjacent channel rejection: Not specified. FM two-tone, third-order IMD dynamic range: Not specified.

Measured in the ARRL Lab

20 kHz channel spacing, preamp on: 29 MHz, 66 dB; 52 MHz, 64 dB; 146 MHz, 70 dB; 440 MHz, 71 dB. 20 kHz channel spacing, preamp on: 29 MHz, 66 dB*; 52 MHz, 64 dB*; 146 MHz, 70 dB*; 440 MHz, 75 dB; 10 MHz channel spacing, preamp on: 52 MHz, 91 dB; 146 MHz, 78 dB; 440 MHz, 80 dB. S9 signal at 14.2 MHz: preamp off, 34 V; preamp on, 11 V; 52 MHz, preamp off, 14 V; preamp on, 6.6 V; 146 MHz, preamp off, 18 V, preamp on, 4.1 V; 432 MHz, preamp off, 17 V, preamp on, 5.7 V. At threshold, preamp on: SSB, 14 MHz, 1.4 V; FM, 29 MHz, 0.11 V; 52 MHz, 0.06 V; 146 MHz, 0.06 V; 440 MHz, 0.06 V. 2.1 W at 10% THD into 8. Range at -6dB points, (bandwidth): CW-N (500 Hz filter): 200-1000 Hz (800 Hz); CW-W: 182-3077 Hz (2895 Hz); USB-W: 182-3077 Hz (2895 Hz); LSB-W: 182-2667 Hz (2485 Hz); AM: 275-2860 Hz (2585 Hz). First IF rejection, 14 MHz, 120 dB; 50 MHz, 54 dB; 144 MHz, 64 dB; 432 MHz, 108 dB; image rejection,14 MHz, 112 dB; 50 MHz, 121 dB; 144 MHz, 71 dB; 432 MHz, 80 dB.
S-meter sensitivity: Not specified.
Squelch sensitivity: SSB, <5.6 V; FM, <0.3 V. Receiver audio output: 2.0 W at 10% THD into 8. IF/audio response: Not specified.
Spurious and image rejection: 1.8-30 MHz, 70 dB; 50-54 MHz, image rejection, 65 dB, IF rejection unspecified; 144-148, 430-450 MHz, IF and image rejection, 65 dB.
Transmitter Power output: HF & 50 MHz: SSB, CW, FM, 100 W AM, 40 W (high); 144 MHz, 50 W (high); AM, 20 W (high); 430 MHz, 20 W (high); AM, 8 W (high).
Transmitter Dynamic Testing HF & 50 MHz: CW, SSB, FM, typically 103 W high, <1 W low; AM typically 29 W high, <1 W low; 144 MHz: CW, SSB, FM, typically 53 W high, <1 W low; AM, typically 19 W high, <1 W low; 430 MHz: CW, SSB, FM, typically 20 W high, <1 W low; AM, typically 6 W high, <1 W low. Spurious-signal and harmonic suppression: 50 dB HF, 53 dB; 50 MHz, 67 dB; 144 MHz, 61 dB; 430 MHz, 68 dB. on HF; 60 dB on VHF & UHF. Meets FCC requirements for spectral purity. SSB carrier suppression: 40 dB. As specified. >59 dB. Expanded Product Review Report Available Undesired sideband suppression: 50 dB. As specified. >64 dB. The ARRL Laboratory offers a detailed test result report on the ICOM IC-706MKIIG that gives Third-order intermodulation distortion (IMD) products: Not specified. See Figure 1. in-depth, technical data on the transceivers perforCW keyer speed range: Not specified. 6 to 50 WPM. mance. Request the IC-706MKIIG Test Result ReCW keying characteristics: Not specified. See Figure 3. port from the ARRL Technical Department, 860594-0278; e-mail Members Transmit-receive turn-around time (PTT release to 50% S9 signal, 21 ms. can see this on-line on our Members Only Web site. audio output): Not specified. Receive-transmit turn-around time (tx delay): Not specified. SSB, 20 ms; FM, 210 ms. Unit is suitable for use on AMTOR. Composite transmitted noise: Not specified. See Figures 4 and 5. Bit-error rate (BER), 9600-baud: Not specified. 146 MHz: Receiver: BER at 12-dB SINAD, 2.2103; BER at 16 dB SINAD, 4.6105; BER at 50 dBm, <1.0105; transmitter: BER at 12-dB SINAD, 4.6103; BER at 12-dB SINAD + 30 dB, 2.1104. 440 MHz: Receiver: BER at 12-dB SINAD, 2.3103; BER at 16 dB SINAD, 8.4105; BER at 50 dBm, <1.0105; transmitter: BER at 12-dB SINAD, 2.8103; BER at 12-dB SINAD + 30 dB, 1.9104. Size (HWD): inches; weight, 5.4 pounds.

Note: Unless otherwise noted, all dynamic range measurements are taken at the ARRL Lab standard spacing of 20 kHz. *Measurement was noise-limited at the value indicated. Third-order intercept points were determined using S5 reference.
Reference Level: - 60 dBc/Hz Vertical Scale: dBc/Hz
sponds to the number of sample points, the height of each bar indicates the SWR at that point. This is a very neat featureespecially if youre trying to figure out where your antenna system is going wrong.

What Got Better?

One of the nice little touches on this transceiver is how the IF bandwidth icon pops up in the menu keys area as soon as you touch the IF SHIFT knob. The bandwidth narrows appropriately if you switch in a narrow filter too. Another nice touch is the backlighted buttons. Even the P.AMP/ATT, RIT/SUB and TUNER/CALL buttons are visible in darkness. When not activated, they emit a dull, orange glow. An annoying and potentially damaging problem that wed spotted in the earlier models in the IC-706 line appears to have been eliminated for the most part in the MKIIG. In From July 199 QST ARRL
Frequency Sweep: 2 to 22 kHz from Carrier
Figure 4Worst-case HF spectral display of the IC-706MKIIG transmitter output during composite-noise testing. Power output is 100 W at 14.02 MHz. The carrier, off the left edge of the plot, is not shown. This plot shows composite transmitted noise 2 to 22 kHz from the carrier.
Figure 5Worst-case VHF/UHF spectral display of the IC-706MKIIG transmitter output during composite-noise testing. Power output is 20 W at 432.02 MHz. The carrier, off the left edge of the plot, is not shown. This plot shows composite transmitted noise 2 to 22 kHz from the carrier.
the earlier incarnations, if you cut back the powersay to match the required input for an amplifierthe transmitter still would put out a very brief spike of up to full output power when the transmitter was first keyed that lasted until the ALC took hold and reined in the output to the desired level. Some users reported that amplifiers sometimes would kick off as a result. ICOM apparently was listening. The leading-edge spike on the MKIIG is much less prominent and should not cause the same sorts of problems.
The IC-706MKIIG continues the worthy tradition of being an easy-to-use and (almost as important) easy-to-mount subcompact radio. As with all the previous 706s, this versions control buttons and knobs are logically positioned and adequately spaced and sized for convenient operation. The tuning speed automatically increases with faster knob rotation and a well-designed knob spinner and a drag adjustment lever is provided. The built-in speaker in the last two iterations actually sounds pretty decent. The thermostatic control for the cooling fan, also added with the MKII model, was a welcome improvementespecially for fixed-station operation. ICOM offers a nice selection of optional IF filters. Two slots are available (up from one in the original 706), and the plug-in sockets make the filters easy to install or swap out. Unlike the competition, the radios in the 706 series only require a single quick-release separation cable for remote mounting of the control head. The head includes a connection point for the mike, and a switch on the back of the front panel allows you to use the phones jack for either headphones or an external speaker. This is a real convenience if you intend to use the radio in multiple applications. Two notable weak points present in both of the earlier units, unfortunately, have also remained unchanged in the G. From the advent of the IC-706 series, one of the things wed complained about was fact that turning on the noise blanker can impart a lot of crackling artifacts, especially on a busy band or in the presence of nearby strong signals. Yes, it does work to eliminate pulse noiseI checked it out on the engine noise of passing vessels while operating marine mobile one weekend, and it worked just fine. Only when the band started to fill up a bit later did I start hearing the characteristic crackling noiseand realize Id left the NB on. The AGC is another thing thats the same across the entire model line. It can be fast or slow (no display indication means its in the slow mode), but not off. For my tastes, the fast AGC is too fast for comfortable SSB listening, and I wasnt crazy about it for CW either. My tendency was to leave the AGC in the slow mode at all times. The AGC is accessible via the main menu.

Multiple Menus

First-time users of the IC-706MKIIG (or From July 199 QST ARRL
of any of the 706 lineage, for that matter) will encounter a bit of a learning curve getting used to all the menus. The IC-706MKIIG has not one, not two, but four menus; unfortunately, the Instruction Manual does not cover all of them in the same place. Lets take a look at the layers of menus. First, theres the M menua primary menu set that includes four sets of three choices apiece. These have not changed from the previous model. Successive quick presses of the DISP button get you to the S menu and the G menu. The S menu includes the Memo Pad, the Scan Func, the B.S.R. (bandstacking registers), and the D.S.P. functions. The G menu includes the Band Scope, an SWR Graph mode, a TX Freq readout mode, and a Memory Name mode. But wait, theres more: press and hold the DISP button and you get to the Q or Quick Set menu, which sets a variety of mode-related functions in addition to power output. There are some changes in this menu set, owing to the fact that ICOM has shifted some settings that were manual adjustments on the MKII are now menu adjustments on the MKIIG. The VOX GAIN and ANTI VOX used to be little trimpot adjustments on the side of the transceiver. Putting them into the Quick Set menu is a giant step toward greater convenience. The only trimpots on the side of the radio now are COMPression GAIN and the BEEP/SIDE Tone adjustments. To top it all off, the 706 series provides whats called an Initial Set menu. The Initial Set menu in the MKIIG contains 37 choices as opposed to 28 in the MKII, so there are some changes in the Initial Set menu from the previous model. One possibly convenient settingits the first one in this set of adjustmentsis called Mode Select. It lets you inhibit the selection of unneeded modes. This eliminates the admittedly minor annoyance of having to step through, say, RTTY, when switching modes when you have no intention of operating RTTY. Since the buttons now are backlighted on the MKIIG, the Initial Set menu provides a way to set the backlighting at either the HI or LO brightness level. The MKIIG is 9600 bps capable; you set the packet speed1200 bps or 9600 bps via the Initial Set menu. In the 9600 bps setting, the signal from the TNC passes through an internal limiter to maintain bandwidth. This brings up another new item from the previous model. The MKIIG has a new 6-pin mini-DIN DATA jack on the rear apron for packet connections to a TNC for either 1200 bps or 9600 bps operation. Something thats really handy for FM repeater ops is that the Initial Set menu on the MKIIG also lets you select a DUP offset9.999 MHzto set the standard repeater split on HF, 50, 144 and 430 MHz. You still can set a standard split that you then can retrieve at the push of a menu function button. Once enabled via the Initial Set menu, the DUP offset makes available the onetouch repeater function. As it suggests, it

allows you to set repeater operation with the push of one switch. Something new on the MKIIG, the auto repeater function, also is enabled via the Initial Set menu. This automatically activates the repeater settings (duplex direction and tone encoder on or off) when the operating frequency is within a repeater subband. This means, for example, that the duplex direction automatically will be + if youre in the 147 MHz range of 2 meters and within the repeater subband. The upside of the individual menus is that not all items are in one big menu and, as a result, are more accessible. The downside is that all menu items are not in one big menu. It can be difficult to remember which menu function is where, and the groupings are not always intuitive. In addition to other information, the convenient Operating Guide that accompanies the manual includes a Menu Switch Flow Chart that certainly is a step in the right direction to simplifying matters.

Lets do the Numbers

In performance terms, did anything important change between the MKII and the MKIIG? SSB and CW sensitivity numbers are about the same across the boardHF and VHF. The 70-cm band falls into the same ballpark as well. Blocking dynamic range was slightly betteras much as 12 dB better and not noise-limited on 3.5 MHz this time. Two-tone, third-order IMD dynamic range measurements were ever so slightly better than the previous modeland only noise-limited on 144 MHz this time, not on all bands. There was one difference. On the MKII we looked at early last year, thirdorder intercept had been in the positive numbers (preamp off) on 3.5 and 14 MHz. All third-order intercept numbers were negative on our MKIIG. AM sensitivity appeared to be significantly improved on the MKIIG we tested. On 3.5 MHz, it went from 1.0 V to 0.68 V. In the aircraft band, it went from 2.0 V to 0.91 V. FM sensitivity numbers between the MKII and the MKIIG were comparable on 50 and 144 MHz and slightly better on 10 meters.

CW Keying

In the two earlier IC-706 models, wed noted some limitations on the CW keying, especially when transmitting at speeds in excess of around 30 WPM using full-break-in, with or without the internal CW keyer. Our Lab measurements (see Figure 3) backed up the on-air reports wed received of clipped characters. Dits were all shortened with highspeed keying. In the semi-break-in mode, only the first dit was shortened. The on-air reports I received from my CW connoisseurs on 40 meters were not especially flattering of the IC-706MKIIG while using full-break-in and the internal keyer at or above 30 WPM or so. By the way, the IC-706MKIIG menu reads out CW
sending speed using the actual number (or a rough approximation) of words per minute. On the FT-100, you have to guess, since the number is only a relative indicator of sending speed.
Compared to the Competition
The IC-706MKIIG seemed to appear in response to the Yaesu FT-100, the first radio of the subcompact genre to offer the 70cm band and announced at Dayton Hamvention 1998. Their features and street prices are similar, but there are some differences that go beyond the merely cosmetic. Whether these will matter to you depends a lot on how you plan to use the radio. Wed strongly suggest you take a close look at the product review for the Yaesu FT-100 (see

Getting Started

The programming scheme used in this radio is really quite uniquefor a communications receiver that is If your VCR has been flashing 12:00 PM since the day you plugged it in, perhaps this is not the radio for you. Several different menus and submenus are used to configure general operating parameters; to set the clocks and timers; to program the individual memories; to assign frequency limits for searches; to set upper and lower memory positions for programmed scans and to input alphanumeric tags. These appear on the screen in much the same format as the programming menus on most current VCRs and television sets. Each menu screen contains a list of related settings move a cursor to the setting you wish to change and press the ENT er key. This gives
you access to a submenu, or puts you in position to input digits with the keypad. Some settingsmode and bandwidth for examplerequire stepping through a group of choices with the main tuning knob or the + and buttons on the remote. Once you get a feel for it, its really quite simple. The receiver includes two separate VFOs and a memory mode. 100 channels in 15 banks provide plenty of storage for your favorite frequencies. Alphanumeric tagging, up to 7 characters (practically a necessity with 1,500 memories), lets you easily keep track of your stored information. Each memory/bank location retains the frequency, the memory name, the AGC setting, the mode and the IF bandwidth settingsand displays them all simultaneously (see Figure 6). After tuning around a bit and catching some action in the VFO mode, it wont be long before youll want to try programming
a few frequencies into the memories. Press and hold the EDIT/. key on the front panel to bring up the Memory Function menu (see Figure 7). Here youll find menu items that let you edit or delete memoriesor copy, move or swap memory information. The memory menu is only accessible using the front panel mounted EDIT/. key. This key is not included on the remote.

Search and Scan

In addition to the typical scan and search operations, the 7000B also includes eight search and eight scan memories. Press and hold the SEARCH/8 button and the Program Search menus appear. You use the main tuning dial or the + and TUNE buttons on the remote to move between the search memories. You can program into each a search name (40 Mtrs for example), stop and start frequencies, scan direction, tuning step size, mode, bandwidth and scan pause duration. Hit the RUN/BRK key and a band scope display appears (see Figure 8). The receiver then searches the range, graphically displaying the relative signal strength and pausing on active frequencies. Theres even a setting that can automatically store up to 100 active frequencies into your choice of memory banks. From July 199 QST ARRL

A combination of cutting-edge display technology and impressive spectrum agility make the AR7000B an attractive and versatile tool for the widerange communications enthusiast.
Table 2 AOR AR7000B, serial number 050011 Manufacturers Claimed Specifications Frequency coverage: Receive, 0.1-2000 MHz (cell blocked). Power requirement: Receive, 1.5 A;
Receiver SSB/CW sensitivity, bandwidth not specified, 10 dB S/N: 0.1-0.7 MHz, <1.6 V; 0.7-20 MHz, <1.5 V;20-1200 MHz,. <0.5 V; 1200-2000 MHz, <2.0 V
Measured in the ARRL Lab As specified.
Receive, 1.2 A. Tested at 13.8 V.
Modes of operation: SSB, CW, AM, FM, WFM. As specified.
AM sensitivity, 10 dB S/N: 0.1-0.7 MHz, <4.2 V; 0.7-20 MHz, <3.5 V; 20-1200 MHz, <1.3 V; 1200-2000 MHz, <4.0 V.
FM sensitivity, 12 dB SINAD: 0.1-0.7 MHz, <4.0 V; 0.7-20 MHz, <2.0 V; 20-1200 MHz, <0.56 V; 1200-2000 MHz, <1.6 V.
Second-order intercept: Not specified. FM adjacent channel rejection: Not specified. FM two-tone, third-order IMD dynamic range: Not specified.
S-meter sensitivity: Not specified. Squelch sensitivity: Not specified. Receiver audio output: 1.0 W at 10% THD into 8. IF/audio response: Not specified.
Receiver Dynamic Testing Noise floor (mds), 500 Hz filter: 1.0 MHz 127 dBm 3.5 MHz 129 dBm 14 MHz 131 dBm 50 MHz 137 dBm 144 MHz 135 dBm 432 MHz 140 dBm 10 dB (S+N)/N, 1-kHz tone, 30% modulation: 1.0 MHz 3.67 V 3.8 MHz 3.16 V 50 MHz 1.23 V 120 MHz 1.33 V 144 MHz 1.88 V 432 MHz 0.676 V For 12 dB SINAD (15 kHz bandwidth): 29 MHz 0.305 V 52 MHz 0.489 V 100 MHz 0.489 V 146 MHz 0.402 V 223 MHz 0.320 V 440 MHz 0.214 V 902 MHz 0.335 V 1270 MHz 0.421 V Blocking dynamic range, 500-Hz filter: 3.5 MHz 95 dB 14 MHz 98 dB 50 MHz 69 dB 144 MHz 67 dB 432 MHz 69 dB Two-tone, third-order IMD dynamic range, 500-Hz filter: 3.5 MHz 78 dB 14 MHz 78 dB 50 MHz 80 dB* 144 MHz 102 dB* 432 MHz 98 dB 3.5 MHz 12 dBm 14 dBm 14 MHz 50 MHz 17 dBm 144 MHz +18 dBm 432 MHz +7.0 dBm +51.4 dBm. 20 kHz channel spacing: 29 MHz, 44 dB; 52 MHz, 43 dB; 146 MHz, 46 dB; 440 MHz, 36 dB. 20 kHz channel spacing: 29 MHz, 44 dB*; 52 MHz, 43 dB*; 146 MHz, 46 dB*; 440 MHz, 36 dB*; 10 MHz channel spacing: 52 MHz, 73 dB; 146 MHz, 91 dB; 440 MHz, 63 dB. S9 signal 1 at 14.2 MHz: 242 V; 146 MHz, 237 V. At threshold: SSB, 14 MHz, 2.5 V; FM, 29 MHz, 0.45 V; 52 MHz, 1.0 V; 146 MHz, 0.71 V; 440 MHz, 0.35 V. 0.8 W at 10% THD into 8.
Press and hold the SCAN/9 key to access the Program Scan memories. Each contain settings to set up a memory channel scan between selected upper and lower memory channel limits. A setting in the memory menu allows you lock out specific memories from the scan modes. The scan speed in either search or scan is 20 channels per second. One priority channel is also included. With the priority feature activated, the selected memory channel will be checked for activity at an adjustable time interval between 1 and 60 seconds.

Hook Ups

The rear panel includes a jack for 12 V dc inan external ac power supply is provided. The antenna connector is a BNC type. Theres an 8-pin DIN auxiliary socket, a female DB-9 jack for direct connection to your PC COM port for computer progamming or control and a 3.5 mm external speaker jack. (Youll find a second 3.5 mm jack on the front panel for headphones.) The remaining items mounted here are two RCA type connectorslabeled VIDEO and AUDIO, and a small slide switch marked PAL/ NTSC. The 8-pin auxiliary socket contains connections for switching circuitry tied to squelch activity, a mute control point, a fixed level audio output, a 12V dc (10 mA) voltage source and ground. The VIDEO and AUDIO jacks and the associated switch allow some interesting possibilities. You can connect the video output to TVs or VCRs that have auxiliary NTSC or PAL inputs (in the US, video equipment typically uses the NTSC format). The receivers display will now appear on your TV. You can even connect the audio output of the 7000B to the audio input of your home electronics. Much to the consternation of my spouse, I connected the audio and video jacks to the television in our living roominstant big screen receiver! While I couldnt get away with this arrangement long enough to run further tests, Im confident that similar interconnection with our VCR would have resulted in a great system to capture frequency activitysuch as the local public service trafficfor later review. Pop in a tape, set the VCR for LP, hit record and youre in business. Not only will you have a record of the radio communicationsyoull also capture the full front panel displayfrequency, signal strength, date/time, etc Sitting there in my living room, remote control in hand, enjoying one of my favorite pastimes was tremendous fun. It didnt last longI was soon once again banished to my basement shack. If DX listening is your passion, youll be happy to find that the AR7000B includes five separate clock/date displays. You can program in local and UTC time/date and still have space to set information for three distant locations. You can assign any three letter alphanumeric tag to identify the displayed time zone (EST, UTC, PST, for example). A
Range at 6dB points, (bandwidth): CW-N (500-Hz filter): 526-1111 Hz (585 Hz); USB-W: 222-2666 Hz (2444 Hz); LSB-W: 222-2666 Hz (2444 Hz); AM: 176-3317 Hz (3141 Hz). Spurious and image rejection: Not specified. First IF rejection, HF, 89 dB; VHF, 65 dB; UHF, 48 dB; SHF, 71 dB; image rejection, HF, 114 dB; VHF, UHF, SHF, N/A. 2 Size (HWD): inches; weight, 7.7 pounds.
Note: Unless otherwise noted, all dynamic range measurements are taken at the ARRL Lab standard spacing of 20 kHz. *Measurement was noise-limited at the value indicated. Third-order intercept points were determined using noise-floor reference. 1S-meter is color based, so S9 figures were taken at the maximum limit of the green region. 2The image rejection for these frequencies is outside of the ARRL Labs measurement capabilities.

Figure 6The display screen of the AR7000B showing the contents of memory channel 2 of bank 1. Graphic representations of the signal strength and volume level appear at the top of the screen. The selected squelch level is indicated in S units.
Figure 7Most programming operations are carried out using a system of menus does this arrangement look familiar?
Figure 8The AR7000B band scope in the search mode. The band limits, search name (40 Mtrs in this example), mode, step size, bandwidth, sweep direction and pause duration can all be varied in a setup menu.
on the remote or the front panel cycles you through the selections. Five receiver on/off timers are also available. These are programmable for both the time and date. Use these in conjunction with the squelch activated relay control and the fixed level audio output (accessible from the 8-pin auxiliary jack), and you can set up a tape recorder to capture scheduled communications. You could also use these timers and the audio/video outputs to tape with your VCRjust program identical stop/start times into both units.

Back to the Shack

The AR7000B is a triple conversion superhet with digital signal processing applied at the 10.7 MHz IF. This allows a wide range of DSP-based selectable filter bandwidths and an IF shift featureboth very handy for fighting off nearby interference. Fast and slow AGC settings are available, and theres a 10 dB attenuator included as well. Tuning around in this wide a chunk of frequency spectrum is a blast. You can use the front panel tuning knob, the tune buttons on the remote, or enter frequencies into the VFOs directly on the front panel or the remote keypad. The main tuning knob rotation action is detented. I did run into some instances where the rebound of the switching action bounced the frequency back a step as I cranked. While this was a bit unusual, it was not a major annoyanceI did most of
my tuning with the remote control. I started out on the lower end of the range tuning through the AM broadcast band. Although the AM sensitivity in this frequency range is greater than 3 V (see Table 2), there were still plenty of distant stations to explore between the big locals. I tuned past a weather report from Toronto, a talk show in Buffalo and finally settled on listening to a ballgame rebroadcast from an Ohio station. AM audio quality, even when using the built in top-firing speaker, is quite goodon both broadcast and shortwave AM. Tuning up into the HF ham bands and listening in the SSB and CW modes revealed decent overall performance. While not quite up to the standards weve come to expect in radios designed specifically for the Amateur Radio market, this unit compares favorably with some of the other communications receivers weve looked at recently. The ability to tune in 10-Hz steps, the wide variety of available DSP-based filters and the IF shift feature worked very well for casual HF listening. In the SSB modes, you can select digital filter bandwidths of3, 2.5 or 2 kHz. For CW, you can choose from 5 bandwidths ranging from 800 Hz all the way down to 50 Hz. AM choices are 8, 6 and 3 kHz. Lab tests revealed two-tone, third-order IMD dynamic range in the HF bands in the high seventiesperformance does suffer a bit under busy band conditions. Moving up into the VHF region and beyond, the tremendous memory capacity, the

band scope and the automatic frequency storage system make it easy to find and collect interesting subjects for your listening library. Sorting through the accumulated frequencies, choosing which ones to keep or delete, assigning alphanumeric tags and deciding which bank to archive them in will keep you occupied for hours. If your main listening interests center around local FM activity in this upper end of the frequency spectrum, you may be a bit disappointed the lack of CTCSS squelch.

Overall Impressions

The AR7000B lures you in with its pretty face and its user-friendly programming scheme. What true electronics buff could possibly resist the opportunity to connect yet another audio/video device to the home entertainment system and add one more remote to the ever-growing pile on the coffee table? The AR7000B falls slightly short of the performance benchmarks set by some of the other tabletop receivers currently available in the AOR line. That saidits likely that some may be willing to compromise a bit of performance for the unique display and control arrangement and the interesting interconnectivity options offered by this receiver. Manufacturer: AOR USA, Inc, 20655 S Western Ave, Suite 112, Torrance, CA 90501; 310 787-8615; fax 310-787-8619; http:\\ Manufacturers suggested list price, $1460. Typical current street price, $1150.

From July 1999 QST ARRL

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Improvement of modulation SSB for IC-706 Kenwood MC-45 mic on your Icom IC-706 Tune controller mod for IC-706 Motorola Keypad Microphone for IC-706 IC-706 to codan 9350 auto antenna tuner interface IC-706 all version, modulation tweaks at ease IC706 Mk1- Deaf on 144Mhz
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Increased mic gain for the icom IC-706 Increased SSB modulation ic-706 e-z fix for the 706 ICOM IC-706, NO RX Sensitivity. ICOM IC-706, RF OUTPUT on 1 band only and low on others Adding an extra RX-only port in the Icom IC706
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Improved VHF recieve mod (see also yellow wire mod) To expand the band on the VHF portion FM Transmit Fix
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IC-706 Microphone Audio Response Improvement "Halbautomatik" f++r manuelle Tuner am ICOM IC-706 IC-watt tune modification/An Icom IC706 Tune Trigger IC-706, MKII, MKIIG xmit mods - tip Some tips. MARS/CAP Modification for ICOM IC-706 Icom IC-706 Review
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Icom ic-706 with a computer Mic


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Contact author: iw5ejm

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This information will allow the use of an Icom 706. I have ONLY used this on my 706 so test it on all others at your own risk. You will need an 8 conductor (RJ-45) ethernet connector (male) and a crimping tool. Radio shack has a non-crimp version if you don't want to invest $45 for a new tool. If you place the tab down, pin 1 is the furthest to the left. Computer's mic are electret condenser element. There are lot's of type: headset, desktop. clips mic.choose the best for you. The problem stems from the fact that electret condenser elements must be powered. Usually any voltage between 1 and 12 volts will work. The current draw is very low. While some microphones will use their own battery, most expect to get power from the radio (or whatever it's plugged into). If you examine the male plug at the end of most electret condenser microphones, you will find a 1/8 inch (3.5 mm) stereo plug. It's very easy to jump to the conclusion that the three terminals must be ground, signal, and power, most likely on the sleeve, tip, and ring, respectively. For the several microphones I checked, all coming from computer applications, the plug was stereo, but the cable was mono. The tip and ring terminals are connected together within the molded plastic plug. By the way, the plugs on computer microphones tend to be red in color. This matches the color on the jack, making it easier to determine where the plug belongs. This implies that the signal wire and the power wire are the same wire. This will work, so long as you use a blocking capacitor to keep the DC voltage off of the audio input, and a resistor to allow a voltage drop as the signal level changes. Let's get very specific. On my ICOM radios, pin 1 of the front panel 8-pin microphone connector is the audio input. I connected a 10 uF capacitor to this pin. Pin 2 of the connector is the element power, which is +8 VDC. I connected a 2.2K ohm resistor to that pin. The free end of the capacitor, which is also the (-) end if the capacitor has polarity, is connected to the tip terminal of a 1/8 inch (3.5 mm) female jack. The free end of the resistor is connected to the ring terminal of the 1/8 inch jack. the third connection is ground, pin 7 on the connector. Ground is wired to the sleeve terminal of the jack. Since I use VOX, and my headset does not have a PTT (push to talk) switch, I do not need to wire up the PTT pin. Your application may differ.

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IC-706 Audio Punch overwork


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Contact author: Ernesto Lastra B+??hme

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Dear 706 users, Attached find a rework of the original idea to increase the audio punch on the stock Icom Mic and i.e. a Heil Headset Mic. The Mic Gain was very poor; only with COMP on no screaming was necessary,hi. Taken the first idea found here at the page lead me and my friend Jochen, DG2IAQ to think over. On my 706 first versions the Mic Bias resistor R 393 on the MAIN PCB (underside) was 1kOhm origin. The main PWR was guided via C 467 (10-??F) to GND; the rest was used by the IC 22 Mic-Amp. This was way to low in value; therefore the Mic-Gain (Menu Q2) was always on high! Removing the stock 1 kOhm resistor and installing a 4.7 kOhm resistor instead was the right thing to do. Audio Mic Gain is now at 3 or 4 in Q2 Menu!! And no more screaming. The COMP GAIN Pot is now ccw to min !!!!! Thinking about some more punch in the audio / basses line, leads us to check the R/C design of R 236 and C 210. As previously described do not solder a C of 220 pF over/ parallel with C 210 instead, remove C 210, remove R 236 and replace with new value: C 210 = 330 pF and R 236 with 120 kOhm. This gives a 4 kHz low pass and good for full "voodoo" sound !! The Gain normally is 27k / 5k6 = 5 times, with 120 k / 5K6 we reached 20 times gain!!! All you have to do is to remove all the connectors and cables and gently move the MAIN

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PCB of its position, turn the PCB around and check the SMD parts as seen in the Pictures. After installation Mic-Gain and COMP Gain pot must be realigned! No responsibility will be taken, it is on you own risk SMD parts are very little to work with and you can ruin your PCB ez !! Many thanks to the first intro of this mod and OM Jochen, DG2IAQ who helped also to find "specially" the 1kOhm Resistor , hi !!!
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External Amplifier Keying from the IC-706


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Contact author: Bob Wolbert, K6XX
Icom??????s IC-706 compact transceiver is intended for mobile use, but its small size also appeals to DXpeditioners. Unfortunately, Icom designers decided against installing a T/R (transmit/receive) control line output for interfacing an external power amplifier. The circuit presented here provides that interface. A 13-pin DIN connector on the rear panel of the rig has a bidirectional control pin named HSEND (HF Send). In receive mode, it is pulled to +8V through approximately 1.2kW. When transmitting, HSEND is about zero volts. Since it is bidirectional, grounding HSEND externally will also place the transceiver in transmit mode. The characteristics of this pin prevent its use as a direct T/R signal for most amplifiers??????it only sinks about 6mA, and most amplifier control lines pull higher than 8V. Directly connecting HSEND to a typical amplifier could damage the IC-706. This circuit is designed to switch amplifiers using up to 40V and 200mA on its T/R control line. It is a double inverter that isolates the amplifier??????s T/R voltage from the more ??????delicate?????? HSEND, with Q1 buffering HSEND and Q2 switching the amplifier. I built this circuit inside the hood of the 13-pin DIN, with a length of RG-174 coax running to the amplifier. If your amplifier relay needs more than 200mA of current or voltage greater than 40V, replace Q2 with a suitable power transistor. The IC-706 now keys my amplifiers, but it gives the Alpha fits??????not because of the T/ R switching, but because the Alpha is a fully-protected high gain amp, and the IC-706 has an awful, full power leading edge spike than trips the overdrive protection. Even when the IC-706 is adjusted to the 40W or so needed to drive the Alpha to 1500W of output, a several millisecond 100+ watt RF pulse is output at initial key down. This is a major design fault with the ALC circuitry inside the IC-706. It prevents using the Alpha with the IC-706 in all modes except SSB, and occasionally faults even on initial voice peaks in that mode. The unprotected, lower gain AL-1200 requires all available drive power from the ??????706, and does not flinch. Other unprotected highgain amplifiers will not shut down, but might suffer severely reduced tube life from the overdrive. I do not recommend using the IC-706 with any amplifier requiring less than 100W of drive. The two-transistor circuit described allows keying power amplifiers from the IC-706. It is small and simple, and may be built inside the connector hood of the interface cable. An Icom design flaw prevents using the IC-706 with high gain amplifiers, however.

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Now the filter is ready to be installed. Just one tip: If you are going to install it in a IC706 use the slot filter number 2. There is very few height between the filter and the cover, and the speaker is just above the filter in the slot 1 so as you filter will be slightly taller than original you will be in troubles to close the cover. Best 73, any comments email me. My email address is OK in QRZ.COM. EA2BSN Note, this mod would apply to the following ICOM: IC-575, IC-706, IC-725, IC-737, IC746, IC-756, IC-775, R-72, R-75.
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voted: 4

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Improvement of modulation SSB for IC-706


Contact author: Michael A.Kourdov
For improvement of quality of sounding SSB on my transceiver I use Microphone with a reverberator or a mode surround. It is the most simple updating with the biggest effect. As a microphone it is possible to use any microphone. Use of microphones from a cellular telephone is possible. Dynamic microphones give also good effect.
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Kenwood MC-45 mic on your Icom IC-706


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Contact author: Kyle, K0KN
Use Kenwood MC-45 mic on your Icom 706. Info by Kyle Yoksh, K0KN This adds DTMF capability to your 706 for low cost. Audio reports on FM and SSB have been very good with this mic. First, you will need a new coiled mic cord. Kenwood uses a common GND for the PTT and 8v supply, as well as the MIC ground, so the stock mic cord is just 4 conductor. Icom uses a separate MIC ground, so it is necessary to use a coiled cord with 5 conductors. I found a coiled cord in my junk box with RJ45 modular connectors already on it! These were sometimes used for old wired-in cellular car phones. Prepare the mic end of the cable with a suitable strain relief, or in my case a simple knot. Note that a little physical modification of the mic case will be needed if you select the latter method. With the new cable ready, start by finding the GND side of the mic element with an ohmmeter. Measure between pins 4 or 5 of the original mic connector (GND) and both mic element connections. When you find the ground side of the mic, cut this wire close to the PCB. Bend the wire away from the PCB a safe distance. Make sure you have enough room to attach a new wire to the mic element. You've now isolated mic ground from common ground. You will attach a wire to the mic element in just a moment. Apply a drop of glue to secure the mic element to the PCB, as the wire you just cut also used to support the mic element. Connect your new RJ45 cable to the mic using the table below. For those new to RJ45 connectors, hold the connector with the pins facing up, and the locking pin down. The pin numbers are 1 through 8, left to right.

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IC706 Mk1- Deaf on 144Mhz


Contact author: Vic GW3RME
An American amateur has given his answer to one reason why the 706 can go deaf on 144 Mhz. It because of two small sm coils becoming detached from the main circuit board. The coils are located under the power supply socket which will need sliding up from its location to allow the sm coils to be resoldered. In my opinion the reason the coils become detached is due to faulty mechanical design. If the set is used moible frequently, with the constant removal and replacement of the power connector the socket bends and then comes into contact with the coils which get loosened from the circuit board. The permanent cure is to fix the power socket with hot melt glue at the top of its vertical travel when it will not then come into contact with the coils. Vic GW3RME
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Increased mic gain for the icom IC-706


This modification isn't easy but it takes care of the low audio problem and brings the 706 up to speed. IC22 is the microphone preamp chip. R236, the feedback resistor, is 27K from the factory. Remove it and replace with a 120K resistor. Add a 220 pF bypass capacitor in parallel with C210 and you are ready to go!
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Increased SSB modulation ic-706


Contact author: stephen
Adjust R511 clockwise, which is located near the front left of the radio to increase maximum SSB talk power (Transmit total gain).
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down. I have done this to my 706 M2G and you can do this to a 706 and it runs fine. The only problem I have is that you have to pull out the front bracket/ rest and you can't fold it back unless you find a smaller fan around 1 inch. have fun. 73's Mark KG4OHH Gayle KG4QOZ
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ICOM IC-706, NO RX Sensitivity.


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Contact author: David, VK4GL
( The display is still tuning OK though. ) 1: Check RL1 on the filter board. Watch RL1 as you power on/off. The relay has a clear case. This is a Tx / Rx relay for switching the antenna from the RX input to the PA output. If Q1 driver transistor is short, the relay is held ON, so the receiver is almost stone-deaf. The antenna is connected to the PA all the time.
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ICOM IC-706, RF OUTPUT on 1 band only and low on others
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This can be caused by a blown relay Driver transistor on the the FILTER board. There are a set of band-pass filters switched by input/output relay pairs. If one of the relays stays closed, then two filters are effectively in parallel, so the filter tuning is stuffed, and the PA doesn't see the correct load. Check by measuring the relay drive power as the receiver is tuned. (Set the dial tuning steps to 100 KC for ease of tuning.) Measure the drive change on each relay coil at the appropriate frequency transisiton. The switch points for changeover of the filters are:
Freq MHz 0 - - - - - - - 60 Drive Line L1 L2 L3 L4 L5 L6 L5 Relay pair RL14 and 15 RL12 and 13 RL 4 and 5 RL 8 and 9 RL 10 and 11 RL 6 and 7 RL 2 and 3
The problems in both cases had probably been caused by RF leakage on transmit across the PCB due to salt. The rig had been used in the tropics on an island in a past life. There was corrosion evident on some of the tin-plate shields, mild-steel screws, etc.
This article has been read 11341 times.
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Adding an extra RX-only port in the Icom IC706


Contact author: Jaap van oosten
This is usefull when using a big PA and or for RF bandpass filters. My FT102 + transverter recently broke down So i now use the IC706. The sensitivity of the IC706 is not what I was used with the transverter. There is raise of noise when connecting the antenna so in fact it is just suffici+??nt. Using the IC706 with an external PA you might need a lownoise preamp. But it is not so easy to use because without extra protection relays it can, and sure will be destroyed by the driving power of the IC706. The best solution is having an extra RX??????only input like most bigger tranceivers have. This way the preamp can be placed direct behind the first antenna relay and the output of it Goes to the RX-only port. The best place for this antenne relay of course is as close as possible to the antenne to avoid extra cable loss however not so practical. Adding a separate RX port is an easy and clean modification. There is a spare opening in the backpannel where an extra BNC connector can be placed. Extra rings are used to fit because the hole is to big for the BNC. Then this BNC must be connected to J1 (rx) point found at the back of the filterunit. The filterunit is situated top-backside. After removing 5 screws the board can be moved up at the backside Just enough to mount the BNC underneath it. It is not needed to remove it completely that would be a problem because of all connections to it.

Bedienungsanleitung f++r die "Halbautomatik": Die TUNER-Taste hat die gleiche Funktion wie mit Automatik-Tuner, nur Abstimmen muss
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man manuell. Falls die Antenne vor Ablauf der 20 Sekunden angepasst ist, schaltet ein Druck auf die TUNER-Taste den Transceiver auf QSO Betrieb um.
Haftungsausschluss: Der Autor ++bernimmt keine Haftung f++r eventuelle Schden an Gerten, Leib und Leben der Nachbauer.
Literaturhinweis: [1] ICOM @DL de:DJ9XB 24.08.99 18:1555 Bytes tune control' fuer IC706, aber Handbetrieb HI *** Bulletin-ID: O89DB0ZDF02H ***
St++ckliste R1 = 1M Widerstand R2 = 10k Widerstand R3 = 8k2 Widerstand R4 = 100k Widerstand R5 = 1k Widerstand R6 = 5k6 Widerstand R7 = 15 Widerstand C1 = 22 Tantal-Elko 16V C2 = 10n Sibatit C3 = 100n Sibatit C4 = 100n Sibatit C5 = 22 Tantal-Elko 16 V T1 = BC548 NPN-Transistor T2 = BC559 PNP-Transistor T3 = BC548 NPN-Transistor D1 = ZPD 5V1 Z-Diode IC1 = NE 555 Lochrasterplatine ca. 46mm x 25mm Schrumpfschlauch St1 = siehe Text
Alternative zum modifizierten PC Stecker: Steckergehuse Molex 03-09-2041, Best.Nr. 143-207, ca. DM 0,40
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Chrimp-Kontakte 02-09-2118, 143-219, ca. DM 12,- (gibt es nur in Beutel = 100 St.) Fa. Farnell, Gr++nwalder Weg Deisenhofen. oder Original ICOM Kabel f++r AH-3 oder AH-4 zum Preis von ca. DM 80,00

Bild 1 Stromlaufplan

Ausschneiden Bild 2 PC-Stecker
Bild 3 Layout ( vergr+??ssert )
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Bild 4 Lochrasterplatine

Bild 5 Lochrasterplatine L+??tseite
This article has been read 13468 times.
IC-watt tune modification/An Icom IC706 Tune Trigger


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Contact author: Larry Lefczik, WA2EHZ
(Some assembly required) The ICOM IC-706 has a nifty feature built in to help the operator tune the HF antenna SWR. By pushing the TUNE button on the front panel, the radio switches to CW mode and transmits a 10 Watt carrier. This state last for approximately 10 seconds or the operator can terminate sooner by pushing the button again. This was designed to work with the Icom automatic antenna tuners. There have been a few circuits developed to fool the 706 into thinking there is a Icom tuner attached and produce the same tuning signal which can be used with a manual antenna tuner or many automatic tuners, some get quite complex. Well, being the cheap guy I am, and being one to tinker, I felt there had to be a simple way to do this. I began reading the various postings on the Internet. I went back to an email exchange I had with Ed, W1AAZ in early April 1999 on Vartel's ICOM 706 Discussion Group. Ed explained the functions of the TKEY and TSTR pins on the "AH-3" connector on the 706. The outcome was a simple RC circuit which I have built right on a Molex connector which plugs into the AH-3 jack on the back of the IC706. Construction: The (+) side of C is connected to the 13.8VDC pin. The (-) side connected to TSTR and TKEY which are connected together. Resistor R is in parallel with C. Below is a diagram of the AH4 connector on the back of the IC706 where the < indicates the pointy end of the connector (Pin 1 = TKEY). You can buy the Molex connector at Radio Shack (#274-0224).

< TKEY TSTR 13.8V |_____| | | R | +--\/\/\/--+ | + | +----)(----+ C GND ]
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Bottom view of connector Note: I have also used this connector to tap power for "ClearSpeech" DSP speaker. The power cable shown is not part of the TUNE TRIGGER circuit.
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The values I use are C=1000uF 16WV R=92K Ohms 1/8 Watt which result in 15 seconds of tune time. As you can see, these are tied in parallel. If you want to use a physically smaller capacitor such as 440 uF, you can adjust the time by raising R. The extreme values I found are:
2K<R<3.3M Ohms 10uF<C<4700uF.
Operation: Be sure to read the manual about the various Initial Settings that can affect the operation with a tuner connected, otherwise you may go into the TUNE mode every time you change frequency or push the PTT. Turn off the radio and plug in the unit. Make sure you have some sort of load on the HF antenna connector. Turn on the IC706, the radio sees TSTR is high during boot up and thinks there is a tuner connected. Be sure the meter is in the SWR mode. Push the TUNE button. The TUNE light should flash counting the seconds and stay lit when finished, as stated in the manual. You may interrupt the cycle by pressing TUNE again.
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If you terminate the TUNE mode early by pressing the button again, you must wait for the remainder of the time-out period to re-start. If you don't then the cycle is started over again when you press TUNE and you still must wait, but longer. This is why I have opted for 15 seconds instead of a possible 30 seconds. One way to reset the timer is by powering the IC706 off then on. I have noticed false triggering when the supply voltage AT THE IC706 POWER CONNECTOR drops during transmit and C has not yet totally discharged. This is caused by the TKEY voltage dropping through the trigger point because the supply voltage drops while C is discharging. This lead me to upgrade my power supply cable so there is less voltage drop when I transmit. Alternate design: You can eliminate the capacitor and the TKEY to TSTR connection if you want to manually trigger the IC706 into TUNE. You do need the pull-up resistor between TSTR and 13VDC to make the radio think there is a tuner present during power up. Then ground TKEY to trigger the TUNE mode as long as TKEY remains grounded. Thanks to Ed, W1AAZ for the explanation of the connector. Enjoy! 73 de Larry Lefczik
This article has been read 17276 times.

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6 meters and 2 meters, all-mode 100 watts on HF and 6 meters (10 watts on 2 meters) Innovative, easy-to-operate menu system. It becomes quite easy and natural to use after reading the well-written manual for about an hour. (In contrast to my Yaesu FT-470 HT, which I still cannot figure out.) The manual is very well written, with lots of easy-to-understand diagrams. Simple, but useful and configurable band scope. (Previously available only on very expensive rigs like the Icom 781.) This allows you to examine nearby frequencies for activity. Split frequency operation appears complicated at first, but the rig's "quick split" mode makes it fast and easy. Built-in electronic keyer at no extra charge. The Up/Down buttons on the mic can be used as a paddle. This has rejuvenated by interest in CW. I worked a couple of slow CW stations on the novice portion of 80m, which made me remember how fun CW is. FSK (Nice feature for this price range) DTMF and programmable offset for repeaters and split frequency work Good audio reports from contacted stations. A station on 3.85 MHz reported "a very good signal for a mobile". A 2m FM station reported "very good audio. so that's the 706 I've been hearing about." Works very well with the AH-3 antenna tuner. This is the Icom HF (1.8-30 MHz) random wire tuner that worked with the 725. The tuner is mounted under the trunk lid of my car with cable ties. It can also be mounted outdoors. It will tune any 8foot whip or wire for any HF band. (You need 40 feet for it to tune to 160m.) You can press a button to enable the tuner, or the tuner can fire off automatically if your SWR is too high. With my 7-foot 6-meter whip, I can tune to any HF band above 3.5 MHz. That means I need only one simple antenna for HF and 6m. 100 memories that store frequency, split offset, mode, and FM tone. Two antenna connectors: one for HF/6m and one for 2m. The connectors are switched at 60 MHz. Jacks for remote speaker and/or headphones on both the face plate and the back of the rig. Multifunction meter: S meter, SWR, relative power output, ALC.


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************************************************** *ARRL Radio Designer v1.0 *IC-MHz to 200 MHz bandpass filter * Gary Coffman KE4ZV 1/18/96 ************************************************** Blk **Component data inductors L22:1.2uH L49:82nH L40:68nH L25:0.15uH L26:0.18uH L27:1.2uH

;ideal 27nH ;ideal 22nH

**Component data capacitors C51:.001uF C154:20pF C153:0pF C152:32pF C53:0pF C151:24pF C52:18pF C54:220pF C55:22pF C56:82pF C57:27pF **Node list IND L=L22 CAP C=C51 CAP C=C154 IND L=L49 CAP C=C153 CAP C=C152 IND L=L40 CAP C=C53 CAP C=C52 CAP C=C151 CAP C=C54 IND L=L25 CAP C=C55 CAP C=C56 IND L=L26 CAP C=C57 IND L=L27 BPF:2POR END
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;was 12pF ;was 20pF ;was 20pF
**Frequency block FREQ ESTP 50MHz 300MHz 511 END **********************
Gary Coffman KE4ZV 534 Shannon Way Lawrenceville, GA 30244
This article has been read 12559 times.
Icom IC-706 Extended RX mod
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By OH6LGM Icom 706 doesn't out of stock listen to frequencies over 148MHz, although that is advertised. At Least mine didn't. Studying the schematics I noticed a front-end filter, that should be operating in the range of 60MHz - 200MHz. I studied the filter with a program and noticed, that the passband was 60MHz - 140MHz !! The upper end was blocked out. I changed the circuit in a way that enables the radio to work as advertised by removing Capacitors C53 and C153. Now the filters upper edge is around 230MHz. This modification doesn't affect 2m RX in anyway, because 2m has its' own, thight frontend, that is used instead of the modified filter, when in 2m band. HF and 6m aren't affected either. The Capacitors are found in the PA UNIT board, behind the external speaker connector in a relatively easy place. The job requires cautiousness because the components dislike static and excessive heat. This modification works, if the radio isn't already modified with the modification, which puts 2m front-end in use in frequencies above 144MHz. At Least My unit worked well with this modification. Measured from my IC-706:
Frequency 60-140 144-Sensitivity (microvolts /20dB SINAD) 0.14 0.12 0.18 0.15 0.2 0.3 0.4 0.6 1.5 1.5 >100mV -- deaf! 5 29
This article has been read 15887 times.
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Info/mods for IC-706

Print ######################################################################## New yellow wire disconnect and reattchment to vco switch bank works!!!!! This mod is great thanks for everyones help out there!! ########################################################################

(Cecil A. Moore~) writes: > In article, > wrote: > >>The fourth yellow wire seems to control >>a lowpass/highpass 120 MHz filter. In the standard configuration the >>highpass filter is used only on 144-148 MHz, every other frequency uses >>the lowpass. Anyway, if you want to listen to frequencies above 120 MHz >>this mod is very useful. It does even remove most of the FM band >>intermodulation. I just don't understand why Icom has not put the switching >>limit on 120 MHz instead of 144/148. > > Does this mod affect HF or 6m? After the mod, what frequencies use the LP > and what frequencies use the HP filter?
The mod affects only frequencies above 60 MHz. If you just cut or remove the yellow wire, the HP or actually 2m bandpass filter is used all the time. Last night I took the loose yellow wire and connected it to a VCO control switch transistor
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(?) on the lower PC board. Now I have the LP filter in use between 60 and 129 MHz and the 2m bandpass between 129 and 200 MHz. There are five SMD transistors on the lower PC board just behind the "MENU" button. The one in the middle controls the VCO that is in use from 60 to 129 MHz. The single pin has 5V when within this range. The mod affects only frequencies above 60 MHz. If you just cut or remove the yellow wire, the HP or actually 2m bandpass filter is used all the time. Last night I took the loose yellow wire and connected it to a VCO control switch transistor (?) on the lower PC board. Now I have the LP filter in use between 60 and 129 MHz and the 2m bandpass between 129 and 200 MHz. There are five SMD transistors on the lower PC board just behind the "MENU" button. The one in the middle controls the VCO that is in use from 60 to 129 MHz. The single pin has 5V when within this range. There is a trace from this pin to a plated-through hole near J8. This is a good place to connect the wire. (I haven't even seen the schematic so cannot say if this is the best way to do it. But it works for me.) 129 MHz seems to be quite close to the cross-over point of the LP and 2m BP filters. Here is a listing of the (NBFM) signal strength needed to "light" the first segment on the Smeter on each frequency:
MHz 185 uV/LP.30 uV/BP 140

After the mod I can listen to the Helsinki airport on 134 MHz but the Meteo on 128.4 is still drowned in intermod from the FM BC band.
>thanks and 73, Cecil, KG7BK, OOTC (not speaking for my employer)
Neither am I. Proceed at your own risk etc. And have more fun with the 706!
This article has been read 19153 times.
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voted: 3.33 Fantastic

IC-706 Expanded frequency
If you think to change your new little rig into a UFO read following info. Read everything and wait. "Notice : We can not guarantee specification when expand frequency" To find every detail you shoud have the service manual. At this moment I have to deal with some bad copy's. I think they went for 21 times into a Xeroxcopy. By cutting diode D59 only, "nyea what's up doc?" does not work. So here are the results (read the above notice) to leave your UFO on the table. ** Cut the D59 diode on main Unit. (TOP SIDE of P.C. Board) ** Where do you find this little thing? If you can locate the Filter option place you will see in the middle of the P.C. board 5 little things on one line and this is what you're looking for. But whait. Maybe this can help you.
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** If you have a USA-version you need additional modification. ** ** Cut D60 and jumpre wire W4. ** Next lets find Q38 or R353 on MAIN UNIT (top side of P.C. Board) You can find this when you are already in the rig, you have a large metal cover (like a box, probably there is a lot of money inside HI)
+---------------+ -?? -?? -?? -?? -?? -?? -?? -?? -?? -?? -------------------?? -?? -?? -?? -?? -?? -?? -?? -?? -------- -?? -?? *. -?? -??. -?? -??. -?? -?? -------- -?? -?? -?? -?? -?? -?? -?? -?? -?? +---------------+
**Then you have to cut the P.C. board at a certain point on the bottom side.** It is not so far away from H2, H6 and IC 32 **And then you have to add a jumper wire from pin 11 of IC32 and a certain point on the bottom of the main unit. So only cutting D59 this is a joke. I can even say a BIG joke. To explain you the total modification you need a service manual. In a few day's (around 100 HI) I'm able to put the schematics on packet. I will try and hopefully you can do something with it. So don't jump around in your nice equiped shack, do not make a UFO out of your new 706 just wait and I can see what I can do.
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Hold your horses. HIHIHIHIHI Any comments, AA2ZE@ON7RC.#BR.BEL.EU 73 de AA2ZE
This article has been read 23431 times.

IC706 - spare 0.3A

Dr Oms If you can spare more than 0.3 Amps from battery on /p operation switch off backlight of yellow display (Initial Set Mode, item 5.) This helps much, i have only abt 1.1 Amps for receive now I did not find any info in the manual Best of luck 73 petr



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