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Icom IC-7200

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Icom IC 7200 Basic Operation

 

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Comments to date: 8. Page 1 of 1. Average Rating:
Sliego 7:06pm on Tuesday, November 2nd, 2010 
WHEN YOU BUY A REFURBISHED COMPUTED YOU ARE HOPING FOR NO PROBLEMS BECAUSE OF THE 90DAY WARRENT INSTEAD OF 1YEAR THIS HARD DRIVE WORKS GREAT FOR MY NE...
fernin8r 7:48am on Wednesday, October 27th, 2010 
Pay attention to those adapter! We had four Lacie external hard disks using those kind of adapter.
MasterTom 9:22pm on Saturday, October 9th, 2010 
After opening the box to many similar strategy type games, medieval total war was something very different indeed.
ZeusTexas 7:00pm on Friday, July 2nd, 2010 
250GB Hitachi Hard Drive Serial ATA 3.5inch (SATA) 250GB Hitachi Hard Drive Serial ATA 3.5inch (SATA) ...seems to be OK... works OK...arrived on time.
lesliek 5:50pm on Friday, June 25th, 2010 
Disk had read errors on both Acronis backup and Hitchi own test program, after 1 month. This hard drive is awesome, i bought 2 of these for Acer Home Server to replace a WD Green and the performance is better than Western Digital Green.
EricR 6:16pm on Friday, May 7th, 2010 
I bought this drive to replace my old 250gb western digital and 320gb samsung hard drives.
chris_fwhrs 6:27am on Saturday, April 24th, 2010 
250GB Hard Drive The vendor was good and the disc works just fine, but I had trouble with their carrier. Several phone calls, contradicing advice. RELIABLE And better than SEAGATE relieable and probably the best simple deisgn that does the job right!!!!RECOMMENDED unlike for seagates!! Hitachi Deskstar 7K1000 1TB S/ATA11 Internal 3.5" Hard Drive - HDS721010KLA330 So far, the drive has performed perfectly.
Jim Ramsey 3:52pm on Saturday, April 10th, 2010 
Bought these for a RAID array in the NAS I built for my home network. My second experience with Hitachi; the first was was not good. Here read/write data (MB/s): Seq 122.9/116.5 510K 51.6/45.06 4k 0.868/1.429 4k QD32 1.123/0.975 Still works after 8 months with no problems.

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Documents

doc0

PRODUCT REVIEW

Key Measurements Summary

ICOM IC-7200 HF and 6 Meter Transceiver
20 kHz Blocking Gain Compression (dB)
2 kHz Blocking Gain Compression (dB)

99 110

20 kHz 3rd-Order Dynamic Range (dB)
2 kHz 3rd-Order Dynamic Range (dB)
Reviewed by Steve Sant Andrea, AG1YK ARRL Assistant Editor The IC-7200 combines some of the IC7000s brains with the IC-718s brawn.1,2 With the 7200, ICOM has created a transceiver with many of the digital features users expect in a modern radio, but packaged in a compact, rugged IC-718 size case that just begs to be taken along for the ride. With receiver coverage from 30 kHz to 60 MHz and transmitter coverage from 160 to 6 meters at 100 W in SSB, CW and RTTY and 25 W in AM, the IC-7200 will keep you on the air whether from home, car or boat.
complexity beneath. Most of the buttons serve two functions. The primary function is selected with a short press of the button; the secondary function by holding it down for about a second. Each action, press or hold, activates a different set of functions. This control philosophy has been used on ICOM radios for quite a while and quickly becomes second nature. Additionally, ICOM has made the front panel water resistant. While not waterproof, it will tolerate an occasional blast of spray on your boat or a spilled coffee cup during a contest.

23 +35

20 kHz 3rd-Order Intercept (dBm)

-40 -11 +35

2 kHz 3rd-Order Intercept (dBm)

TX -20 -32

Transmit 3rd-Order IMD (dB)

Rear Panel Front Panel

The IC-7200s front panel is neat and uncluttered. On the left are the front-firing speaker, microphone and headphone jacks and two dual function knobs. The center section contains the display, six function buttons and the main tuning dial. The right hand section contains a group of 17 buttons and a dual function knob. As with all microprocessor controlled radios, the number of controls belies the

1M. Wilson,

TX -20
K1RO, ICOM IC-7000 HF/VHF/ UHF Transceiver, Product Review, QST, May 2006, pp 64-71. QST Product Reviews are available on the Web at www.arrl.org/ members-only/prodrev/. 2S. Ford, WB8IMY, ICOM IC-718 HF Trans ceiver, Product Review, QST, Jul 2000, pp 63-67.
The 7200 runs on 13.8 V dc and requires about 20 A. A fused power cable is supplied. The radio incorporates an electronic keyer with the KEY jack on the rear panel. The external speaker jack accepts a 3.5 mm plug. A single SO-239 UHF connector is provided for the antenna connection. The rear panel has a bumper that protects the connectors from rough handling. Heres a new feature: a universal serial bus (USB) interface. Transmit and receive audio can be sent over the USB interface, along with CI-V commands for transceiver control. In order to use the USB interface, you must download free driver software from ICOM, and a detailed manual is available too. This driver looks like a standard sound card to applications software, so your existing digital mode software should work
Transmit 9th-order IMD (dB)
Dynamic range and intercept values with preamp off. Intercept values were determined using -97 dBm reference

80 M 20 M

Bottom Line
The IC-7200 is a compact, easyto-operate HF and 6 meter transceiver that offers many features for voice, CW and digital mode operating. Rugged, water-resistant packaging makes it attractive for portable and emergency stations.

Mark J. Wilson, K1RO

Product Review Editor

k1ro@arrl.org

June 2009 51
with this interface eliminating the need for an external computer/radio interface for digital modes such as PSK31 or RTTY. A traditional ICOM REMOTE jack provides another means for control of the 7200 from your computer if you have the appropriate CI-V interface and software. Jacks for ALC (automatic level control) and SEND (TR relay control) are available for connection to a linear amplifier. A TUNER connector provides an interface to control an optional external antenna tuner. The ACC jack is a 13-pin connector that provides a transmit control line, a data line and keying line; ALC voltage line; a 1 A, 13.8 V dc output; RTTY keying control; a modulation input; an audio line output and a squelch control output. A matching plug is supplied with the 7200, providing a set of color-coded pigtails for the accessory connector inputs and outputs.
Table 1 ICOM IC-7200, serial number 0201073
Manufacturers Specifications
Frequency coverage: Receive, 0.03-60 MHz; transmit, 1.8-2, 3.5-4, 5.3305, 5.3465, 5.3665, 5.3715, 5.4035, 7.0-7.3, 10.0-10.15, 14.0-14.35, 18.068-18.168, 21.0-21.45, 24.89-24.99, 28.0-29.7, 50-54 MHz. Power requirement: 13.8 V dc 15%; receive, 2 A (max audio); transmit, 22 A (100 W out). Modes of operation: SSB, CW, AM, RTTY.

Measured in the ARRL Lab

Receive and transmit, as specified. Reduced receiver sensitivity below 500 kHz.*
At 13.8 V dc: 1.15 A receive (max audio), 16.5 A transmit (100 W out). Operation confirmed at 11.7 V (max 75 W out). As specified.
Receiver Receiver Dynamic Testing SSB/CW sensitivity, preamp on, filter shape Noise Floor (MDS), 500 Hz bandwidth: sharp,10 dB S/N: 1.8-29.7 MHz, <0.16 V; Preamp off Preamp on 50-54 MHz, <0.13 V. 1.0 MHz 121 dBm 131 dBm 3.5 MHz 131 dBm 141 dBm 14 MHz 132 dBm 141 dBm 50 MHz 135 dBm 142 dBm Noise figure: Not specified. 14 MHz, preamp off/on: 15/6 dB AM sensitivity, 10 dB S/N: 10 dB (S+N)/N, 1-kHz, 30% modulation: 0.5-1.799 MHz, <13 V; 1.8-29.7 MHz, Preamp off Preamp on <2 V; 50-54 MHz, <1 V. 1.0 MHz 4.8 V 1.5 V 3.8 MHz 1.6 V 0.5 V 50 MHz 0.9 V 0.4 V Blocking gain compression: Not specified. Gain compression, 500 Hz bandwidth: 20 kHz offset 5/2 kHz offset Preamp off/on Preamp off 3.5 MHz 137/133 dB 101/82 dB 14 MHz 138/135 dB 102/83 dB 50 MHz 135/125 dB 89/76 dB Reciprocal Mixing (500 Hz BW): Not specified. ARRL Lab Two-Tone IMD Testing** Band/Preamp Spacing Input level 3.5 MHz/Off 20 kHz 31 dBm 19 dBm 14 MHz/Off 20 kHz 14 MHz/On 20 kHz 14 MHz/Off 5 kHz 14 MHz/Off 2 kHz 50 MHz/Off 20 kHz 33 dBm 17 dBm 0 dBm 44 dBm 25 dBm 49 dBm 34 dBm 0 dBm 65 dBm 36 dBm 0 dBm 34 dBm 22 dBm 20/5/2 kHz offset: 103/92/85 dBc. Measured Measured IMD level IMD DR 131 dBm 100 dB 97 dBm 132 dBm 99 dB 97 dBm 51 dBm 141 dBm 97 dB 97 dBm 132 dBm 83 dB 97 dBm 28 dBm 132 dBm 67 dB 97 dBm 20 dBm 135 dBm 101 dB 97 dBm Preamp off/on: +78/+78 dBm. Calculated IP3 +19 dBm +20 dBm +17 dBm +23 dBm +26 dBm +2 dBm +11 dBm 7 dBm 2 dBm +14 dBm 31 dBm 11 dBm +10 dBm +17 dBm +16 dBm

Band Selection

The 7200 includes a stacking register for each band, selected with the numeric keys. Holding the BAND button activates stacking register selection and the word BAND is displayed. Pressing the numeric key for the band you want will automatically set the active VFO to that band with the same configuration (frequency, mode, filter, preamplifier, and so on) that you last used on that band. The 7200 has two separate VFOs (A/B) and a 7 + 1 digit frequency display (a 1 Hz digit is displayed in some situations). Frequency can be set manually with the main tuning dial or entered directly using the numeric keys. A one button equalizer copies VFO A into VFO B. While using the main tuning dial, there are three methods of controlling the tuning step (rate) of the main dial: tuning step, auto tuning step and 14 tuning function. The dial can also be locked by holding the SPCH button. The default is a 10 Hz step. Pressing the TS button activates the tun symbol. ing step, which is indicated by a Holding the button gives you the choice of five tuning steps: 0.1, 1, 5, 9 and 10 kHz. The auto tuning step function senses when you are rotating the main dial rapidly and increases the tuning step. This is convenient, for example, to move from the CW to the phone portion of the band more quickly. The auto tuning step speed varies between two and five times the normal rate, depending on its settings. Finally, the 7200 includes a 14 tuning function used in the SSB data, CW and RTTY modes. While 14 tuning is active, the tuning step of the main dial is reduced to about 370 Hz per turn. This permits the precise tuning required by some digital modes. Direct frequency entry is activated by pressing the F-INP ENT button, entering the

52 June 2009

Second-order intercept: Not specified.
frequency and pressing the F-INP ENT again to set the active VFO to the entered frequency. If you make an error, pressing SET returns you to the previous frequency. The receiver incremental tuning (RIT) feature permits you to trim up the sound of a received signal to maximize readability. The RIT control is located at the lower right and can adjust the receive frequency about 10 kHz. A final tuning aid is a band edge marker. When activated, the 7200 will issue a beep
whenever you cross the edge of the current amateur band.

Modus Operandi

The 7200 has seven mode choices: LSB/USB, CW/CW-R (CW Reverse; shift to the opposite sideband), RTTY/RTTY-R and AM; FM is not included. Pressing the MODE button changes the operating mode in a circular fashion, LSB-CW-RTTY-AMLSB and so on. To access USB and the reverse modes, press MODE to select LSB,

QS0906-Prodrev01

Receiver DSP noise reduction: Not specified. Notch filter depth: Not specified. S-meter sensitivity: Not specified. Squelch sensitivity; SSB: Not specified. Receiver audio output: 2.0 W into 8 at 10% THD. IF/audio response: SSB BW = 2.4 kHz: >2.4 kHz/6 dB, 3.6 kHz/60 dB; CW BW = 500 Hz: >500Hz/6 dB, <900 Hz/60 dB. Spurious and image rejection: HF and 50 MHz: 50 MHz: >70 dB. Transmitter Power output: HF and 50 MHz: SSB, CW; 2-100 W; AM carrier power, 1-25 W. Spurious-signal and harmonic suppression: >50 dB on HF, >63 dB on 50 MHz. SSB carrier suppression: >50 dB. Undesired sideband suppression: >50 dB. Third-order intermodulation distortion (IMD) products: Not specified. CW keyer speed range: Not specified. CW keying characteristics: Not specified. Transmit-receive turnaround time (PTT release to 50% audio output): Not specified. Receive-transmit turnaround time (tx delay): Not specified. Composite transmitted noise: Not specified. Weight: 12.1 pounds. Price: $1100.
Receiver Dynamic Testing Variable, 10 dB maximum. Manual notch: > 75 dB, Auto notch: 50 dB; attack time 168 ms. S9 signal at 14.2 MHz: preamp off, 67.8 V; preamp on, 14.3 V At threshold, preamp on: SSB, 1.0 V 2.3 W at 10% THD into 8. Range at 6 dB points, (bandwidth): CW (500 Hz): 384-816 Hz (522 Hz); Equivalent Rectangular BW: 486 Hz USB: (2.4 kHz) 279-2756 Hz (2477 Hz); LSB: (2.4 kHz) 273-2750 Hz (2477 Hz); AM: (6 kHz) 188-3049 Hz (2861 Hz). First IF rejection, 14 MHz, 113 dB; 50 MHz, 94 dB; image rejection, 14 MHz, 62 dB; 50 MHz, 76 dB. Transmitter Dynamic Testing SSB/CW, 1.4-103 W typical; AM, 0-28 W typical. HF, >57 dB; 50 MHz, 68 dB. Meets FCC requirements. >70 dB. >70 dB. 3rd/5th/7th/9th order (worst case band): HF: 32/31/43/58 dB PEP; 50 MHz: 30/36/44/61 dB PEP. 6 to 58 WPM. See Figures 1 and 2. S9 signal, 30 ms. Unit is suitable for use on AMTOR. SSB, 13 ms. See Figure 3.

0 -20 -40 -60 -80 -14025 Freq.

QS0906-Prodrev02

0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 TIME
Figure 1 CW keying waveform for the IC-7200 showing the first two dits in full-break-in (QSK) mode using external keying. Equivalent keying speed is 60 WPM. The upper trace is the actual key closure; the lower trace is the RF envelope. (Note that the first key closure starts at the left edge of the figure.) Horizontal divisions are 10 ms. The transceiver was being operated at 100 W output on the 14 MHz band.
Size (height, width, depth): 3.8 9.inches, incl protrusions, without rack handles.
*Preamp off/on: 505 kHz, 121/128 dBm; 137 kHz, 116/95 dBm; 30 kHz, 77/66 dBm. The preamp does not improve sensitivity below approximately 250 kHz. **Receiver testing was performed with the bandwidth set to 500 Hz and the filter shape to sharp. ARRL Product Review testing now includes Two-Tone IMD results at several signal levels. Two-Tone, 3rd-Order Dynamic Range figures comparable to previous reviews are shown on the first line in each group. The IP3 column is the calculated Third-Order Intercept Point. Second-order intercept points were determined using 97 dBm reference. Single beat note. Reduces two beat notes by 40 dB with attack time of 230 ms. Default values, medium filter, sharp setting. Bandwidth is variable; smooth setting is available. CW bandwidth varies with PBT and pitch control settings.
Figure 2 Spectral display of the IC7200 transmitter during keying sideband testing. Equivalent keying speed is 60 WPM using external keying. Spectrum analyzer resolution bandwidth is 10 Hz, and the sweep time is 30 seconds. The transmitter was being operated at 100 W PEP output on the 14 MHz band, and this plot shows the transmitter output 5 kHz from the carrier. The reference level is 0 dBc, and the vertical scale is in dB.
0 -20 -40 -60 -80 -100 -120 -140 -160 -180 1x1x1x10 4

QS0906-Prodrev03

CW or RTTY and then hold MODE to access the alternate mode. For CW operation, pitch, sidetone level, key type, break-in type, keyer speed and CW sideband (LSB/USB) can all be configured. For RTTY, the 7200 includes a twin peak f ilter, preset for 2125 Hz and 170 Hz shift; three FSK mark tones, four shift widths and selectable keying polarity are also available. To further improve the flexibility of the 7200, each mode (SSB, CW, RTTY and AM) can be separately disabled. So, for ex-
ample, if your operating style doesnt include RTTY, you can disable it and it will not be included when stepping through the modes. The 7200 also has a data mode for SSB and AM. When activated, the modulation for SSB and AM is taken from the MOD input of the accessory connector or the USB interface. CW-R and RTTY-R, once selected, will remain selected even after changing modes; SSB mode defaults to the normal mode, LSB on 160, 75/80 and 40 meters, USB elsewhere for each go-around.

1x10 5

1x10 6
Figure 3 Spectral display of the IC-7200 transmitter output during composite-noise testing. Power output is 100 W on the 14 MHz band. The carrier, off the left edge of the plot, is not shown. This plot shows composite transmitted noise 100 Hz to 1 MHz from the carrier. The reference level is 0 dBc, and the vertical scale is in dB.

June 2009 53

Keeping Track
The IC-7200 is equipped with 201 memory channels. Channels 1 through 199 are memories that can store the transmit and receive frequencies and the operating mode. The remaining two (P1, P2) are band edge channels used as upper and lower frequency limits for the scanning feature. Programming the memory chan- Figure 4 The rear panel of the IC-7200 includes nels is simple. In VFO mode, set antenna and power connectors, ALC and TR control your frequency, rotate the M-CH for a linear amplifier, provisions for digital modes and knob to select a channel and hold computer control. the MW (memory write) button. The 7200 will respond with three beeps when the frequency is stored. Thats it! Now is where you find those items that change you never have to look up that net frequency often, RF power output or keyer speed for again. Programming memory channels in instance. QSM items vary according to the memory mode is similar except you first operating mode in use. Pressing SET opens select the channel to program and then set the QSM, and holding SET opens the SM. up the frequency. Interfering with Interference Recalling the channel is just as simple The 7200 has many interference fighting press the V/M button to activate the memory mode; MEMO will display. Use features, most of which use its digital signal the M-CH knob to select the channel you processing (DSP) system. The IF passband want and youre there. In less time than it width is DSP controlled, according to the takes to say DX, the selected frequency is operating mode, from 50 Hz to 8000 Hz. transferred to the active VFO and you are Each mode has three filter widths narrow, middle and wide. Each width is separately ready to radio! Once you have 201 frequencies stored, adjustable. Im primarily a phone operator a scanner becomes a necessity. The 7200 and found the default phone widths of 1800, is equipped with two scanning modes: pro- 2400 and 3000 Hz to be very good choices. grammed and memory. The programmed For those CW folks out there, the narrow CW scan uses the band edge channels ( P1 and filter default is 250 Hz. This is thoroughly P2) as its lower and upper limits, scanning up to date compared to the IC-718 with its each frequency between those two points. limited selection of optional crystal filters The memory scan steps through only those and DSP add-on for notch filter and noise frequencies stored in memory channels. It reduction starts from the lowest programmed channel and continues to the highest, then jumps back Passband Tuning The DSP passband tuning (PBT) feature and starts over. When it reaches an active frequency, it allows you to shift the entire IF passband stops. The scan resume function controls slightly higher or lower in frequency or to the stop time. With scan resume OFF, the narrow and enlarge the passband width. PBT is controlled by the TWIN PBT dual scan stops at the first active frequency and the scan is canceled. If scan resume is ON, knob located on the upper left of the front the scan will stop on the active frequency panel. The inner knob adjusts PBT1 (the and wait. If the frequency remains active for high frequency edge of the passband) and 10 seconds or goes quiet for 2 seconds, the the outer knob PBT2 (the low frequency edge). The manuals description of the PBT scan will resume. is somewhat thin, so some clarification is Configuring the Radio in order. The neutral position for the PBT is with There are many aspects of the 7200s operation that can be customized to meet both the inner and outer knobs at detent. In your operating style. The Set Mode (SM) this position the IF passband is centered on menu is where you convert the stock radio the IF frequency and the width is set to the into your radio. The Set Mode includes 41 filter passband width setting. If you move items that are of the set-and-forget type. both knobs simultaneously counterclockThis is where you adjust settings such as wise (ccw), you move the passband lower LCD backlighting, meter peak hold and the in frequency without changing its width. Moving both knobs clockwise (cw) shifts internal keyers dot/dash ratio. There is also a Quick Set Mode (QSM) the entire passband higher in frequency. in addition to the regular set mode. QSM So if an interfering station appears slightly

54 June 2009

below your receive frequency, rotating both knobs cw will move the passband higher in frequency, eliminating the interfering signal. The width of the passband can be changed by adjusting the knobs separately. If you turn the inner (high edge) knob cw you are raising the upper frequency limit widening the passband. If you turn the outer (low edge) knob cw you are raising the lower frequency limit narrowing the passband.

Notch Filters

The automatic and manual notch filters are DSP functions used to notch out a very narrow sliver from within the IF passband. This allows you to remove an interfering carrier that is too close to your desired signal for PBT manipulations to eliminate. The digital notch filters are more useful against heterodynes, CW and digital signals than voice modulation. The automatic notch filter (ANF) scans the IF passband, detects up to two interfering signals and notches them out with between 40 and 50 dB of attenuation. The ANF will also track interfering signals as they move across the passband. The manual notch filter (MNF) is operator controlled using the MNF knob at the lower right. You rotate the knob, moving a stationary notch of 75 dB attenuation across the passband, until the interfering signal is removed. The MNF can only notch one signal at a time and will not track a moving signal, but it provides a noticeably deeper notch. The width of the MNF can be adjusted. The ANF and MNF cannot be used together.

Noise Reduction

The DSP noise reduction (NR) feature distinguishes between noise and a signal and then acts, digitally, to reduce the noise with minimal effect on the signal. It will only take one evening of operating on 80 or 160 meters to appreciate its usefulness. With a signal tuned in, just press the NR button to activate the feature, and then hold NR to open the adjusting menu. Turning the dial will vary the NR value between 0 and 15. Dont be tempted to crank the NR up to 15 and just leave it there, though. At low levels of NR, audio quality is not affected, but at the higher levels some audio quality will be lost. Begin with the lowest level of NR and raise it to get the best balance between noise and readability. Last but not least is the noise blanker (NB) This is the great granddaddy of all noise controls and limits pulse type noise.
The NB will act on any strong signal and will distort a loud, nearby station so it should only be used when needed. The 7200s NB has two adjustments, level and width. These can be accessed directly from the NB key. NB level sets the level above which the DSP blanks out the noise spike; NB width sets the time the attenuation is applied.

Lab Testing

The bar for receiver performance in transceivers at all price points has been raised in the nine years since we reviewed the IC-718. Although test procedures and reporting have changed as well, checking comparable numbers in Table 1 against the IC-718 lab tests shows significant improvement in the IC-7200s dynamic range performance. The transmitters third-order IMD is improved as well. ARRL Test Engineer Bob Allison, W B1GCM, took this opportunity to visit Synergy Microwave and check the accuracy of the Labs HP-3048 Phase Noise Test System against newer instrumentation. Dr Ulrich Rohde, N1UL (Synergy Microwave founder and chairman), and Michael Tracy, KC1SX (former ARRL test engineer and now on the Synergy staff) found good correlation between their equipment and the ARRL Lab test results shown in Figure 3. Regular readers of this column will remember that Dr Rohde donated the HP3048 to ARRL to replace the Labs original setup, which was nearly 20 years old. (See May 2006 QST, page 70, for details.) ARRL greatly appreciates the technical assistance, consultation and equipment that Dr Rohde has provided over many years.

Figure 5 The IC-7200s amber display is small but very readable. It includes indicators for often-used features and settings.

Operating Experience

My HF station uses a wire antenna and manual antenna tuner for multiband operation. I set the IC-7200 output to 20 W during adjustment, and the radio didnt seem to be disturbed by the momentary high SWR my antenna presents on some bands. I began operating using the supplied hand microphone. I set the internal meter to ALC and found the audio was very low at the default setting of 50%. Ultimately I found that I needed to raise the microphone gain to 100% in order to get reasonable audio reports. At this point I decided to try using the internal speech compressor. I adjusted the compressor per the manual instructions operating into a dummy load and found that audio reports were much improved. This issue also affects the voice operated transmitting (VOX) feature. Even with the VOX GAIN at 100% I still had to hold the hand microphone within a few inches of my mouth for reliable operation. I also noted a tendency to hit the UP/DN buttons
on the microphone accidentally changing the frequency; this is further complicated by the fact that the dial lock doesnt lock the UP/DN buttons, although if set to act as a keyer, they will not do anything except in CW mode. When trying CW I was flummoxed since keying the transmitter produced a sidetone but no output. I checked my cabling to be sure no problem had developed and found none. A few minutes digging in the manual revealed the solution. The default mode for CW is break-in OFF. With break-in OFF, an outboard TR switch (such as a foot switch) is required. The switch connection is prominently displayed in the manuals Connections for CW section. Having used the rig on SSB, I just plugged in a key expecting to configure the CW later. Lesson learned read your manual. The 7200 will accept straight key, bug or paddles. It has an internal keyer adjustable from 6 to 60 WPM, or you can use your favorite external keyer or computer software. While operating in either break-in mode, the clatter of the TR relay is quite noticeable. If you enjoy operating CW at speeds over 20 WPM in full break-in (QSK), I would suggest using headphones and closing the shack door. For DXing, split frequency operation is accomplished using two buttons. Just tune in the DX station on VFO A and hold the SPLIT button to copy VFO A to VFO B. Then press the A/B button to display VFO B and tune it to the transmit frequency. Thats it youre split. The 1 2.5 inch amber LCD is similar to the IC-718s display. Its definitely not the dazzling full color screen found on the IC7000, but its readable without difficulty and contrast is very good using the LO backlight setting. I found the HI setting too bright for indoor use, but for outdoor, bright sun venues it would probably be fine. The front-firing speaker produces unusually clear sound for a small, internal speaker. As an added aid, pressing the SPCH button generates a female voice that recites the radios frequency, received signal strength and mode. The IC-7200s utility as a portable rig will make it a good fit for emergency operations. I found its controls easy to understand and

had the rig operating fairly quickly. A cheat sheet of basic procedures in the hands of an operator experienced with modern transceivers should allow them to get to their mission quickly. I must stress, however, that the 7200 should have its settings configured before the emergency as these settings greatly impact the rigs operation. Thermal issues need to be kept in mind when operating the 7200. When operating high duty cycle modes, the heat sink on the rear panel will get quite hot. The fan is audi ble but quiet and produces a brisk air flow. ICOM says it is normal for the radio to get hot during high duty cycle modes and the radio does not require a reduction in power output. The transceiver includes thermal protection so that if the radio senses it is getting too hot, the drive is reduced automatically.

The Hard Stuff

The IC-7200 includes a hardcopy manual, which gives you a firm grounding in the transceivers operation. The manual is of the cookbook variety that explains how to wire up the 7200 for various types of operation and options, basic operating procedures for getting on the air, advanced procedures to guide you with its finer points and general information about programmable features and troubleshooting. The manual includes little snippets of theory but primarily consists of the step-by-step operating procedures. The procedures are straightforward and include illustrations of the controls used, the displays that should appear and, in some cases, additional diagrams to help explain a particular function. It does lack directions for the initial setup. I would suggest that once wired up, you start by reviewing the Basic Operations chapter to get a quick feel for the rig. When you are comfortable, hook up a dummy load and go to the Receive and Transmit chapter, then follow the referenced procedures to set up such basics as microphone gain, compressor level, CW pitch and other necessary adjustments for the modes you operate. This will make your initial excursions onto the bands much more enjoyable.

Last Thoughts

The IC-7200 is a rugged, compact rig that is packed with more digital flexibility than can be discussed here. It is well suited for portable operations and will make a good HF solution for your EmComm group. It should also be considered for recreational vehicle or apartment locations where its solid performance and small footprint will be an asset. Manufacturer: ICOM America, 2380 116th Ave NE, Bellevue, WA 98004; tel 800-872-4266, fax 425-454-1509, www.icomamerica.com.

June 2009 55

doc1

IC-7200 User Evaluation & Test Report
By Adam Farson VA7OJ/AB4OJ
Iss. 3, December 3, 2008. Supersedes Iss. 2, November 28, 2008.
Introduction: This report describes the evaluation of IC-7200 S/N 0201013 from a user perspective, as well as the results of several RF lab tests performed on the radio. I was able to spend a number of days with the IC-7200 in my ham-shack, and thus had the opportunity to exercise the radios principal features and evaluate its on-air behavior. Appendix 1 is the detailed test report. 1. Physical feel of the IC-7200: The IC-7200 conveys the solidity typical of a military tactical mobile radio set. I found the overall feel of the main tuning knob and other controls very smooth and pleasant. The rugged construction of the case and front panel, with the positive tactile feel of the Neoprene push keys, adds to this impression of solidity. The main tuning knob, with its chunky Neoprene grip, feels very smooth and has less than 0.5 mm side-play. The other rotary controls, some of which are detented, also have a positive feel. The large, concentric Twin PBT knobs are very comfortable to use; although the IC-7200 lacks the PBT CLR key found on other Icom DSP radios, the center detent facilitates setting Twin PBT to the neutral position. The radio is solidly constructed and superbly finished. It conveys a smooth, precise overall feel. The rear bumper protects the rear-panel connectors and heat-dissipator fins, and the optional front handles (if fitted) will protect the front panel and its controls from accidental damage. Installation of these handles is strongly recommended. 2. Multiple key functions and menus: Most of the front-panel keys have secondary functions which are accessed by pressing and holding the key for 1 sec. The digit-entry function of the numerical keys is actually secondary, and is entered by pressing the F-INP key. The yellow numerical digits are a clue to this, as the F-INP marking is yellow. The secondary BAND (band-selection) function of the F-INP key is marked in white, in keeping with the band markings on the numerical keys (band selection is their tertiary function!) All this may sound more confusing than it actually is. I found the process fairly intuitive after a quick read of the relevant user-manual sections. The SET menu familiar to users of other Icom DSP radios has two levels, accessible by pressing and holding the M-CH/RIT key. Press & hold once to enter the QUICK SET menu transmit power output, MIC Gain, etc. Press & hold again to enter the in-depth SET menu. This menu is similar to SET/OTHERS on other Icom DSP radios. The MCH/RIT key also serves as an EXIT key. Similarly, M-CL restores a selected parameter to its default value.
I found RIT activation a bit tricky. To change the M-CH/RIT control to RIT, the RIT key must first be pressed to activate RIT. The M-CH/RIT knob will switch to RIT automatically when RIT is active (RIT icon displayed). Again, a quick read of the relevant chapter in the user manual was most helpful. The filter selection and adjustment procedure is similar to that on other Icom DSP radios. Press and hold the FILTER key for 1 sec. to adjust the filter bandwidth. All filters are continuously adjustable. The CW Pitch control is a QUICK SET menu item, rather than a separate control. I found it via the user manual! Pressing and holding the Preamp key inserts a 20 dB attenuator in the RF signal path, in place of the preamp. The radios controls and menus were easy to use once I grew accustomed to them. This is certainly a very good way of saving front-panel space without hurting the radios ergonomics. A user familiar with a radio such as the IC-756Pro3 or IC-7700 should find the IC-7200s learning curve minimal. 3. LCD display: Although the IC-7200s monochrome LCD display is fairly small (64 x 24 mm), I found it sharp, highly legible and sufficiently contrasty for comfortable viewing in bright room light or outdoors. There are 3 backlight settings: HI, LO and off. HI is the default. Filter selections and feature activation are displayed via on-screen icons. Some of these are quite small, but I found them easily readable. 4. USB PC interface: The IC-7200 is equipped with a rear-panel USB B port. Thus, the radio can be directly connected to a laptop or other PC via a standard USB A-B cable. This is without doubt one of the IC-7200s strongest features. The USB port transports not only CI-V data, but also TX and RX PCM baseband between the IC-7200 and the computer. As a result, the USB cable is the only radio/PC connection required. Gone forever is the mess of cables, level converters and interface boxes! This is a feature which I would really like to see on all future Icom HF radios. 5. Filter selections and Twin PBT: As do the other Icom DSP transceivers, the IC-7200 offers fully configurable RX IF selectivity filters for all modes. Default Wide, Mid and Narrow filter selections are available for all modes, with continuously variable bandwidth via menu. In addition, there are selectable Sharp and Soft shape factors for SSB and CW. As mentioned in Section 1, the Twin PBT controls have a center detent which facilitates setting Twin PBT to the neutral position (nominal bandwidth, no passband shift). The IC7200 Twin PBT feature operates similarly to that of all other Icom DSP radios, except that there is no BPF icon or visual indication of passband modification on the LCD. This places the user at a slight disadvantage when configuring a non-BPF filter.

6. BPF vs. non-BPF filters: As in the IC-756Pro series and the IC-746Pro, the IC7200 allows the user to select two additional shapes for 500 Hz or narrower filters, in addition to SHARP and SOFT. These are BPF (steeper skirts) and non-BPF (softer skirts). To configure a BPF filter, select a 500 Hz or narrower CW, RTTY or SSB-D filter with Twin PBT neutral. To set up a non-BPF filter, select a filter with BW > 500 Hz, and narrow the filter to 500 Hz or less by rotating the Twin PBT controls. On the IC-7200, this must be done by ear (or by means of spectral-analysis software in the connected PC.) Examples are illustrated in Figures 3 & 4 (Page 8). 7. Notch Filters: The tunable manual notch filter (MNF) is inside the AGC loop, and is very effective. The MNF has 3 width settings (Wide, Mid and Narrow); its stopband attenuation is at least 70 dB. The manual notch suppresses an interfering carrier before it can stimulate AGC action, thus preventing swamping. The auto notch filter (ANF) is post-AGC. It suppresses single and multiple tones, but strong undesired signals can still cause AGC action and swamp the receiver. MNF and ANF are mutually exclusive, and ANF is inoperative in CW mode. 8. NR (noise reduction): The DSP NR functionality works very well. In SSB mode, the maximum noise reduction occurs at a level setting of 10 (max. = 15). As NR level is increased, there is some loss of highs in the received audio; this is as expected. The measured SINAD increase in SSB mode was about 6 dB. 9. NB (noise blanker): I found the DSP NB somewhat more effective than the IC756Pro IIIs analog NB. It will strongly attenuate fast-rising noise pulses, but is somewhat less effective on power-line hash. NB works best in conjunction with NR. 10. Transmit audio parameters: The IC-7200 has only two transmit audio menu items, Mic Gain and compression level. The DSP IF-level compressor is similar to that provided on other Icom DSP radios. It works very smoothly, and does not distort at the default compression level value of 5 (approx. 6 dB compression). The IC-7200 supports emission designator 2K8J3E (to ensure FCC compliance on 60m.) Thus, no transmit bandwidth or equalization menus are provided. The corresponding AM designator is 5K6A3E (double-sideband). The RTTY mode supports F1B (FSK, TX only) and F2B (AFSK). Note that the IC-7200 is not fitted with a transmitter audio monitor. 11. Metering: Three selectable transmit meter scales are provided - Po (RF output), SWR and ALC. Only one of these is displayed. In receive, the on-screen bar-graph indicator is always the S-meter.

12. Interfacing with Ham Radio Deluxe (HRD). Simon Brown HB9DRV and I worked together over a period of several evenings to interface his well-known software suite to the IC-7200. The single USB interconnection greatly facilitated this task. I installed the Icom USB drivers (downloadable from the Icom Japan world-wide support site) and HRD on my laptop. The IC-7200 showed up in the computer as USB Audio Codec. Once I had set the levels correctly, HRD started working, and was displaying PSK31 and RTTY traffic and waterfalls. A level problem was discovered in the course of this task. Simon reported that the PCM baseband level at the input to HRD was 20 to 30 dB below the expected value. A singletone test on the radio then revealed that the analog baseband level at the line audio output (ACC socket, Pin 12) was only 30 mV; the specification calls for 100 to 300 mV. As the line audio output drives the USB audio codec directly, this explained the low PCM level which Simon reported. This issue has been reported to Icom. (Refer to Appendix 2-A.) 13. Brief on-air report: After completing the test suite, I moved the IC-7200 to my shack and connected it to my solid-state 1 kW amplifier and multi-band vertical antenna. The interface was straightforward RF drive, PTT, ALC and carrier request (for amplifier autotuning). Once I had set up the ALC for 1 kW output, I was off and running. On tuning around 20m SSB, I noted that the receive audio sounded clear and crisp on the IC-7200s internal speaker, and excellent on my SP-20. The NB was quite effective against my local power-line noise, but did not eliminate it completely as does the NB on my IC-7700. The NR was very effective, and compared favorably with that of the IC756Pro3. The preamp (10 dB gain) brought weak KL7 stations up to very comfortable copy without S/N degradation. I did not have the opportunity to operate the radio under very strong signal conditions. The SSB filters were excellent, as we have come to expect from other Icom DSP radios. The MNF and ANF were extremely helpful. I was able to notch out single tones with the MNF; the ANF reduced the levels of multiple tones, suppressing the higher-pitched tone and reducing the level of the lower-pitched tone by about 20 dB. Two stations I worked on 20m SSB both reported that the transmit audio with the stock HM-36 hand microphone was a little on the mellow side and lacking in highs. When I substituted my Heil GM-5 for the HM-36, one of these stations complimented me on the audio quality. I also worked a station on 40m CW, using a straight key and semi-break-in. I did not check for dit-clipping. Slight filter ringing was evident when using the CW-M (500 Hz) and CW-N (250 Hz) filters with the Sharp shape factor, preamp on and fast AGC. There is noticeably less ringing if the Soft shape factor is selected. Ringing can be reduced even further by selecting the CW-W (1.2 kHz) filter and narrowing it with Twin PBT (nonBPF).

In a quick check of AM reception, I listened to various MF and HF broadcast stations. A local station on 690 kHz and a music broadcast on 13690 kHz sounded good on the IC7200s internal speaker, but much clearer (as one would expect) on my SP-20. The AM Wide filter (8 kHz) yielded the best frequency response, but Mid (6 kHz) sounded somewhat smoother and Narrow (3 kHz) cut the highs excessively. Unlike other Icom DSP radios in which Twin PBT becomes IF Shift on AM, the IC-7200s Twin PBT is fully functional in this mode. The default (Normal) AGC setting was fine under average to good signal conditions, but I found the Fast setting (AGC-F) quite useful in dealing with rapid selective fading. I found that the NR was quite effective in improving the S/N ratio of weak AM signals, but a setting above 6 cut the highs severely. The NB caused noticeable distortion on modulation peaks, and caused unacceptable pumping at settings above 80%. The ANF is effective in suppressing unwanted tones and heterodynes, but MNF causes distortion when tuned across the signal. The reason for this is that MNF suppresses the carrier in a manner similar to selective fading. An EMC issue was observed when using a headset plugged into the IC-7200s PHONES jack. Distorted RF feedback was heard when transmitting SSB; it was quite severe at 100W and much worse at 1 kW. This problem was observed on 40, 20 and 17m only, and disappeared when a dummy load was substituted for the antenna feedline. (Refer to Appendix 2-B.) 14. Conclusion: After several days worth of cockpit time on the IC-7200, I am very favorably impressed by its solid, refined construction, smooth operating feel, impressive array of features and excellent on-air performance. This is a lot of radio in a very compact package. And Icom have truly scored a coup with the straightforward USB computer interface. 15. Acknowledgements: I would like to thank Ray Novak N9JA at Icom America, and Paul Veel VE7PVL at Icom Canada for making an IC-7200 available to me for testing and evaluation. I would also like to thank Simon Brown HB9DRV for his enthusiasm and help in interfacing HRD to the IC-7200. Adam Farson, VA7OJ/AB4OJ e-mail: farson@shaw.ca http://www.ab4oj.com/ October 11, 2008
Copyright 2008 A. Farson VA7OJ/AB4OJ. All rights reserved.
Appendix 1: Some Performance Tests
As performed in my home RF lab, October 6 11, 2008. Rev. 2, November 28, 2008; Tests 12 & 13 re-run with HP 8563E spectrum analyzer. Rev.3: Test 14 (Power-output tests) added.

IC-7200 S/N 0201013

A. Receiver Tests
1. MDS (Minimum Discernible Signal) is a measure of ultimate receiver sensitivity. In this test, MDS is defined as the RF input power which yields a 3 dB increase in the receiver noise floor, as measured at the audio output. Test Conditions: ATT off, NR off, NB off. Levels in dBm.

Preamp off on 3.6 MHz SSB 2.4 kHz CW 500 Hz -124 -130 -136.5 -140 14.1 MHz SSB 2.4 kHz CW 500 Hz -124 -129 -136 -142 50.1 MHz SSB 2.4 kHz CW 500 Hz -131 -134 -139 -145
1a. AM Sensitivity. Here, an AM test signal with 30% modulation at 1 kHz is applied to the RF input. The RF input power which yields 10 dB (S+N)/N is recorded. Test Conditions: ATT off, NR off, NB off, Wide (8 kHz) filter. Levels in dBm.
Preamp off on 0.9 MHz -97 -107 3.9 MHz -107 -117 14.1 MHz -107 -115
2. Reciprocal Mixing Noise occurs in a superheterodyne receiver when the noise sidebands of the local oscillator (LO) mix with strong signals close in frequency to the wanted signal, producing unwanted noise products at the IF and degrading the receiver sensitivity. Reciprocal mixing noise is a measure of LO spectral purity. In this test, a strong "undesired" signal is injected into the receiver's RF input at a fixed offset from the operating frequency. The RF input power is increased until the receiver noise floor increases by 3 dB, as measured at the audio output. Reciprocal mixing noise, expressed as a figure of merit, is the difference between this RF input power and measured MDS. The test is run with preamp off. The higher the value, the better. Test Conditions: SSB mode, 2.4 kHz filter, preamp off, ATT off, NR off, NB off. Reciprocal mixing noise in dB. Offset kHz 3.6 MHz LSB 14.1 MHz USB 5 94.10 98.5 98
3. IF filter shape factor (-6/-60 dB). This is the ratio of the -60 dB bandwidth to the -6 dB bandwidth, which is a figure of merit for the filters adjacent-channels rejection. The lower the shape factor, the tighter the filter. In this test, an approximate method is used. An RF test signal is applied at a power level approx. 60 dB above the level where the S-meter just drops from S1 to S0. The bandwidths at -6 and -60 dB relative to the input power are determined by tuning the signal generator across the passband and observing the S-meter. Reciprocal mixing noise limits the level range to 60 dB or less. Test Conditions: 10.000 MHz, SSB/CW modes, preamp off, AGC normal, ATT off, NR off, NB off. Filter Sharp Soft 2.4 kHz SSB 1.2 1.Hz CW 1.26 2.Hz CW 1.4 2.56 4. SSB filter roll-off. An RF test signal is applied at a level 6 dB below AGC threshold, with AGC off. The signal is offset 1 kHz from the receive frequency to produce a test tone. While tuning the signal generator across the IF passband, the frequency and audio level are noted at several points on the filter flank. Test Conditions: 10.000 MHz, SSB 2.4 kHz filter, preamp off, AGC off, ATT off, NR off, NB off. Input signal level -101 dBm (6 dB below measured -95 dBm AGC threshold.) Roll-off in dB. Offset Hz Sharp Soft 250 ---1.5 --1 --0.5 -0.-1.5 -3

Figure 1: 2.4 kHz SSB filter (Sharp)
Figure 2: 2.4 kHz SSB filter (Soft)
Figure 3: 500 Hz CW filter (Sharp, BPF)
Figure 4: 500 Hz CW filter (Sharp, non-BPF)
Figure 5: 500 Hz CW filter (Soft)
The above examples depict typical filter passbands. Due to the limited dynamic range of the measurement method, the amplitude scale is not accurate.
5. NR noise reduction, measured as SINAD. This test is intended to measure noise reduction on SSB signals close to the noise level. The test signal is offset 1 kHz from the receive frequency to produce a test tone, and RF input power is adjusted for a 6 dB SINAD reading (-121 dBm). NR is then turned on, and SINAD read at 30% and 50% (max.) NR settings. Test conditions: 10.000 MHz LSB, 2.4 kHz Sharp, AGC normal, preamp off, ATT off, NR off, NB off, Twin PBT neutral. NR Level SINAD dB 8 to (max.) This shows an S/N improvement of 6 dB with NR at maximum for an SSB signal roughly 6 dB above noise level. This is an approximate measurement, as the amount of noise reduction is dependent on the original signal-to-noise ratio. 6. Manual Notch Filter (MNF) stopband attenuation and bandwidth. In this test, an RF signal is applied at a level slightly more than 70 dB above MDS. The test signal is offset 1 kHz from the receive frequency to produce a test tone. The MNF is carefully tuned to null out the tone completely at the receiver audio output. The stopband attenuation is equal to the difference between the test signal power and MDS. Test conditions: 14.100 MHz USB at -70 dBm (S9), 2.4 kHz Sharp, AGC normal, preamp on, ATT = 0 dB, NR off, NB off, MNF on, Twin PBT neutral. Results: MNF nulls out signal completely. Measured MDS was -142 dBm per Test 1. Thus, stopband attenuation 72 dB (= -142 {-70}) The receive frequency is now offset on either side of the null. The frequencies at which the audio output rises by 6 dB are noted. The -6 dB bandwidth is the difference between these two frequencies. MNF -6 dB BW Wide 91 Hz Mid 48 Hz Narrow 30 Hz
Figure 6: Manual Notch Filter (W).
Figure 7: Manual Notch Filter (M).
Figure 8: Manual Notch Filter (N).
The above figures depict the Manual Notch Filter stopband for Wide, Mid and Narrow settings. Due to the limited dynamic range of the measurement method, the amplitude scale is not accurate.

7. AGC impulse response. The purpose of this test is to determine the IC-7200's AGC response in the presence of fast-rising impulsive RF events. Two types of event are applied to the receiver input; RF bursts with a fast-rising wavefront, and pulse trains with short rise times. Test conditions: 14.100 MHz USB for 7a (2.000 MHz for 7b), 2.4 kHz SSB filter (Sharp), NR off, NB off, Preamp off for 7a (on for 7b), AGC Fast. 7a. RF bursts. A pulse generator applies a pulse train to the modulation input of the RF signal generator. The test is performed at two steady-state RF power levels: -20 dBm (S9 + 50 dB) and -10 dBm (S9 + 60 dB) at 14.100 MHz. The pulse generator is adjusted to generate RF bursts of 1.2 S duration. Burst rise time (to -3 dBr) is 200 nS. Pulse period is 600 mS. At -10 dBm, S-meter peaks to S9 + 20 dB. The result for -20 dBm is similar. The AGC recovers completely in 200 mS. There is no evidence of AGC clamping. In Figure 9, the blue bars are the inter-pulse intervals, and the black bars are the AGC recovery intervals.
Figure 9: AGC response for RF bursts at -10 dBm.
7b. Test with pulse trains. Here, the pulse generator is coupled to the IC-7200 RF input via the pick-off port of a line sampler. The sampler's main port is terminated in 50. The IC-7200 is tuned to 2 MHz, as the RF spectral distribution of the test pulse train has a strong peak in that band. AGC Fast is selected as before, but Preamp is on. The pulse rise time (to 70% of peak amplitude) is 10 nS. Three pulse durations are used: 30, 50 and 100 nS. In all cases, pulse period is 600 mS. Pulse amplitude is 16Vpk (e.m.f.) As in Test 7a, the AGC recovers completely; there is no evidence of clamping. Pulse duration nS 100 AGC recovery mS S-meter reading 100 (no clamping) S(no clamping) S(no clamping) S9
Figure 10: AGC response for pulse trains.
8: Noise blanker (NB) impulse response. As the IC-7200's noise blanker is a DSP process "upstream" of the AGC derivation point, the NB should be very effective in suppressing impulsive RF events before they can stimulate the AGC. To verify this, the NB is turned on during Test 7b (above). NB Level is adjusted for best suppression of the test pulses. At 30 nS pulse duration, the S-meter deflection is completely suppressed, showing that the impulsive events never reach the AGC derivation point. Faint ticks are audible in the speaker; as NB Level is varied, the ticks are quieter at 100 than at 0. Next, NR is activated. With NR and NB on, the ticks are inaudible. 9: S-meter tracking & AGC threshold. This is a quick check of S-meter signal level tracking. Test conditions: 2.4 kHz USB, Preamp off, ATT off, AGC normal. A 14.100 MHz test signal at MDS is applied to the RF input. The signal power is increased, and the level corresponding to each S-meter reading is noted. (S9 readings are taken with Preamp off, Preamp 1 and Preamp 2 in turn.) To measure AGC threshold, the test signal is offset -1 kHz to produce a test tone, and the input level turned down to MDS. The IC-7200 AF Gain control is adjusted for -6 dBr test tone level. The input signal power is then increased until test tone level no longer increases. The test is then repeated with AGC OFF. The actual AGC threshold (knee) is the point at which the AGC OFF test tone level first exceeds that for AGC ON (normal).

S dBm S0 -93 S1 -91 S2 -89 S3 -86 S4 S5 S6 S7 S8 S9 S9+10 S9+20 S9+30 -84 -81 -78 -76 -73 -70 -60 -51 -40 Preamp on: S9 = -84 dBm. ATT on: S9 = -50 dBm. Measured AGC threshold (preamp OFF): -95 dBm. S9+40 -32 S9+50 -25 S9+60 -16

B. Transmitter Tests

10. CW Power Output. In this test, the RF power output into a 50 load is measured at 14.100 MHz in CW or RTTY mode, at a primary DC supply voltage of +13.8V. RF Power Setting Po Meter % Power Output W 11. SSB Peak Envelope Power (PEP). Here, an oscilloscope is loosely coupled to the IC7200 RF output via a line sampler. At 100W CW, the line sampler is adjusted for a peakto-peak vertical deflection of 6 divisions. Test conditions: USB mode, Mic Gain 50, Comp Level 10, supply voltage +13.8V. Speak loudly into the microphone for full-scale ALC reading. Figures 11 & 12 show the envelope for 100W PEP, without and with compression respectively. (Note that here, COMP LVL = 10 to show the effect of compression. In practice, COMP LVL should be 5 or lower.)
Figure 11: 100W PEP speech envelope, no compression
Figure 12: 100W PEP speech envelope, with compression
12. Transmitter 2-tone IMD test. In this test, a 2-tone test signal is applied to the USB port from a tone-generator program running on a laptop computer. A spectrum analyzer is loosely coupled to the IC-7200 RF output via a line sampler. At 100W CW, the line sampler is adjusted for a convenient 0 dBc reference (here 10 dB below reference level.) Test Conditions: DC supply 13.8V, measured at DC power socket. 14100 kHz USB-D, DATA on, D-Mod = u, USB Level 100. Test tones: 700 and 1700 Hz, at equal amplitudes. On computer, adjust USB Codec device volume for -6 dBc test tone level ( = 100W PEP). Figure 13 shows the two test tones and the associated IMD products.
Figure 13: Spectral display of 2-tone IMD at 100W PEP.
2-tone IMD Products at 100W PEP IMD Products Relative level (0 dBc = 2-tone PEP) IMD3 (3rd-order) -33 dBc th IMD5 (5 -order) -37 dBc th IMD7 (7 -order) -50 dBc IMD9 (9th-order) -59 dBc
13. AM spectrum and THD with single-tone modulation. As in Test 12 above, the spectrum analyzer is loosely coupled to the IC-7200 RF output via a line sampler. On the IC-7200, RF Power is adjusted for 25W resting carrier. The line sampler is adjusted to set the carrier at a convenient 0 dBc reference. A 1 kHz test tone is applied to the USB port from the tone-generator program running on the laptop computer. Test Conditions: 14100 kHz AM, DATA on, Mod = u, USB Level = 100. On computer, adjust USB Codec device volume for -7 dBc test tone level (90% modulation.) Figure 14 shows the carrier and sidebands. Note the additional sidebands due to harmonic distortion at the high modulation level. The 2nd and 3rd harmonics are at -32 and -37 dBc respectively, corresponding to 2.8% THD.

Figure 14: AM carrier and sidebands.
Harmonic Sidebands at 25W Carrier, 90% Mod. Harmonic Relative level (0 dBc = carrier) nd 2 -33 dBc rd 3 -36 dBc 4th -47 dBc th 5 -58 dBc
14. Power-output tests (December 3, 2008).
Several IC-7200 owners who operate their radios in mobile/portable configurations or on sailboats have expressed interest in the transmitter output as a function of battery voltage, and also in the DC input current at reduced RF power output. The following tests should address these concerns. Test Conditions: 14.100 MHz, RTTY mode for all tests except 14c: 12V TX IMD (USB-D). 14a. RF power output Po vs. DC input current Iin with supply voltage Vin = 13.8V (as measured at DC input socket). In this test, Po is initially set at 100W via menu, then reduced as per the table. Iin is recorded for each Po value.
Vin (V) 13.8 Iin (A) 8 Po (W) 5
The IC-7200's efficiency deteriorates markedly at reduced Po.
14b. Po vs. Vin (as measured at DC input socket). In this test, Vin is initially set at 13.8V, then reduced as per the table. Po is recorded for each Vin value.
Vin (V) 13.8 13.0 12.5 12.0 11.5 11.0 Po (W) 80 67
14c. Transmitted 2-tone IMD Products at Vin = 12V, Po = 100W PEP. The test procedure here is the same as for Test 12, except that Vin = 12V.
2-tone IMD Products at Vin = 12V, Po = 100W PEP IMD Products Relative level (0 dBc = 2-tone PEP) IMD3 (3rd-order) -36 dBc IMD5 (5th-order) -35 dBc IMD7 (7th-order) -45 dBc IMD9 (9th-order) -59 dBc
Note that IMD5 is worse than IMD3 at reduced Vin.
Appendix 2: Issues encountered during review and testing
A. Low Baseband Output (ACC Pin 12 and USB Codec Output)
IC-7200 S/N 0201013. Test date: 9 October 2008 In the course of Ham Radio Deluxe debugging, it was determined that the PCM level arriving at the Digital Master 780 (DM780) Monitor was very low, even on strong PSK31 signals. The program indicated that the PCM level arriving at the soundcard via the USB line was only 4% of the maximum possible value. This can be seen in Figure 15, where the percentage level shown in the DM780 Monitor window is only 4 to 5% of maximum. This low level greatly reduces the dynamic range of the PSK31/RTTY decoder in HRD.
Figure 15: DM780 Monitor for IC-7200 USB Output.
To investigate further, I looked at the block diagram of the IC-7200. (Page 16 is an annotated partial block diagram showing the area of interest.) D/A converter IC1292 feeds receiver baseband to the AAFO line, which in turn drives ACC Pin 12 (AF OUT) and USB Codec IC3202. The PCM baseband from the USB Codec is sent in digital form to the PC. I set up a single-tone test as follows: Tune the IC-7200 to 14399 kHz USB-D (Data ON), apply an RF signal at 14100 kHz and -70 dBm (S9) to the antenna socket. Measure the RX baseband (1 kHz test tone) level at ACC Pin 12 with a high-impedance RMS AC voltmeter. The measured voltage at Pin 12 is 30 to 32 mV. Per the user manual, the spec is 100 to 300 mV. I repeated the test on my IC-756Pro3 and IC-703+, and the corresponding baseband levels at ACC1 Pin 4 (AF Out) were 320 mV and 100 mV respectively. I do not think there is an AAFO level adjustment unless there is one in the alignment menu. Not having a service manual, I do not know whether this is the case. I suspect that a firmware change may be required.

B. Headphone EMC issue

An EMC problem was observed when using a headset plugged into the IC-7200s PHONES jack. Distorted RF feedback was heard when transmitting SSB; it was quite severe at 100W and much worse at 1 kW. This problem was observed on 40, 20 and 17m only, and disappeared when a dummy load was substituted for the antenna feedline. This issue may have been local to my shack, as Icom were unable to duplicate it. Copyright 2008 A. Farson VA7OJ/AB4OJ. All rights reserved. December 3, 2008. 17

 

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