(IC-475) (IC-475) (IC-475) (IC-475) (IC-490) (IC-490) (IC-490) (IC-4SAT) (IC-4SE) (IC-551) (IC-551) (IC-551) (IC-551) (IC-551) (IC-575) (IC-575) (IC-575) (IC-575) (IC-575) (IC-575) (IC-575) (IC-575) (IC-575) (IC-575) (IC-575) (IC-575) (IC-701) (IC-701) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706) (IC-706)
SSB RF Gain English language Tuning speed English language Frequency range & CTCSS tones English language Umbau des IC475E/H zum betrieb mit G3RUH-Modem (9600 Baud) German language Modifikation af IC-490 for 9K6 English language IC-490A 10MHz up modification English language Anschluss eines G3RUH Modems und AFSK-Modem an IC-490E German language ICOM IC-4SAT extended transmit mod English language Extending the Rx. coverage of the IC-2SE and IC-4SE English language Modification af the ScanRate and ScanSpeed for IC551D English language IC-551D to rx down to 47.000 MHz English language IC-551/551D Frequency Alignment English language IC-551/551D EX-107 VOX UNIT -- Installation English language IC-551/551D EX-108 P.B. TUNE UNIT -- Installation English language IC-575 Freq. steps mod English language Power control modification English language Restoration of pass band tuning English language Splitting into RX- and TX paths English language Modification of cw pass band (BFO) English language Disabling of SBB squelch English language Very fast AGC English language SSB RF Gain English language Tuning speed English language Frequency range & CTCSS tones English language General Coverage TX Modification English language Pass band Tuning Modification English language Extended frequency converage on the ICOM IC-701 HF Transceiver English language Computer control of ICOM 701 via accessory connecter English language Info/mods for IC-706 English language IC-706 Expanded frequency English language IC706 - spare 0.3A English language MARS/CAP Modification for ICOM IC-706 English language Icom IC-706 Review English language Enables out-of-band transmit for 1.6 MHz to 54 MHz English language More semsitive transmit for 2 meter English language IC-MHz to 200 MHz bandpass filter English language Icom IC-706 Extended RX mod English language Some tips. German language IC-706, MKII, MKIIG xmit mods - tip English language IC-watt tune modification/An Icom IC706 Tune Trigger English language "Halbautomatik" fr manuelle Tuner am ICOM IC-706 German language FM Transmit Fix English language IC-706 Microphone Audio Response Improvement English language Improved VHF recieve mod (see also yellow wire mod) English language To expand the band on the VHF portion English language Adding an extra RX-only port in the Icom IC706 English language

This modification is read 873 times.
(IC-22) Icom IC22S Packet Modification
The Icom IC22S is a ten watt diode matrix PLL synthesized 2 meter rig manufactured in the early 1970's. In it's stock condition it tunes 146-148 MHz in 15 KHz steps. Since I am sure there are a few of these sitting on shelves collecting dust due to the limited tuning range, why not modify them for the perfect packet rig. First replace the 7.68 MHz Oscillator/Divider crystal (X1) with a 5.12 MHz crystal. This will move the band to 145.00- 146.94 MHz in 10 KHz increments. The repeater offset will now be 400 KHz which should not pose a problem in simplex packet operation. I will give the diode matrix settings for the most commonly used packet frequencies. You can formulate others as needed using the formula N=100*(f-145)+61 and the manual. The diode positions indicated ARE WHERE DIODES ARE PRESENT. The other positions are left empty. 145.01= 145.03= 145.05= 145.07= 145.09= D5,D4,D3,D2,D1 D6 D6,D1 D6,D2 D6,D2,D1 top of page
This modification is read 719 times.
(IC-22) IC-22S mods for 5 KHz step
I have prepared information to modify the IC22S sythesizer to allow it to have 5 KHZ steps in lieu of the original 15 KHZ steps. This will allow the rig to go onto 145.01 MHZ for packet radio operation. In short, the modification requires changing a crystal, making some copper path cuts, adding some jumpers, and installing a new divide by N counter which consists of three CMOS digital integrated circuits. If you put it on a frequency as low as 145.01 you will also need to re-tune the front end and you may need to re-tune the VCO free running frequency. I have made the mod to my radio and am using it to up-load this file. I re-tuned the front end to increase sensitivity back to the normal although it did work without re-tuning. I did not have to adjust the VCO. If you would like to receive the information which consists of a schematic of new counter, old and new block diagrams and instructions to incorporate and test the modifications, send an SASE (standard business envelope, 22 cents postage) to: Jon Reeves, WB9CNE 12125 Trolley Rd. Oaklandon, In 46236-3056 NOTE: The information which will be mailed is being prepared for publication. It is requested that the information be used only for modification of your personal radio and not be passed on without this note or placed on any bulletin board system. I am releasing the information now to assist packet radio operators in their efforts to move to 145.01 MHz and would appreciate consideration of this request.
This modification is read 715 times.
(IC-22) Step modification (packet radio operation)
Before doing any other modification, pins 13 and 16 of IC1 (programmable divider, TC-5080P, PLL board) should be connected together. This allows the PLL to accept all the binary codes and then cover all the frequency range possible with the 22S. This modification is currently done and could be already done on your rig. STEP MODIFICATION (PACKET RADIO OPERATION): The normal STEP between "channels" is 15 KHz. For example, you can tune 146.610, 146.625, 146.640 MHz, but not 146.620, 146.630, etc. The step is settled by the crystal X1 (on the PLL board), located near the VCO (big metal box). The normal frequency of this crystal is 7.680 MHz. This crystal also sets the offset (normal: 600 KHz) when using duplex mode, since the offset is made by a logic circuit that adds 40 to the binary code applied to the programmable divider (PLL). Think about it: 40 x 15 KHz = 600 KHz!!!

q q q q

The unit will now transmit out of the amateur bands. The above modifications provided the following capabilities with my particular unit. FREQUENCY COVERAGE
(VHF) RECEIVE 74.9 Mhz. - 127.9 Mhz. 138.0 Mhz. - 168.0 MHz. 174.1 Mhz. - 189.69 Mhz. 200.0 Mhz. - 287.22 Mhz. 310.0 Mhz. - 349.0 Mhz. (UHF) 355.0 Mhz. - 409.98 Mhz. OFF TRANSMIT OFF 138.0 Mhz. - 159.0 Mhz. OFF OFF OFF
412.37 Mhz. - 498.0 Mhz. 792.85 Mhz. - 966.66 Mhz.
410.5 Mhz. - 470.0 Mhz. OFF
Receive sensitivity throughout both of the Ham bands was better than.5 of a microvolt. Sensitivity in the 200 Mhz. range was a disappointing 1 millivolt and in the 800 Mhz. band a good.7 of a microvolt. Remember, while the unit will receive on those frequencies, it is illegal to monitor cellular telephone communications.
This modification is read 1011 times.
(IC-24) IC-24AT ext frquency
I received the following mods for 24AT out-of-band from a very reliable source (although they don't specify RX only or RX/TX), for 75-195 MHz, 200-490 MHz, and 740-960 MHz. Rumor has it (unconfirmed) that the unit even switches to AM in the air band! 1. 2. 3. 4. 5. Remove diode D8 [see figure below] Attach diode D7 [I believe this is already equipped] Attach diode D12 Remove diode D13 Simultaneously hold "LIGHT", "B", and "#" keys and turn the power on. Release all keys after the display goes out (checks all LCD segments). [This is supposed to enable the out-of-band frequencies above] 6. Simultaneously hold "LIGHT" and "2" keys and turn the power on. This enables the 10 MHz frequency digit entry. 7. Simultaneously hold "LIGHT" and "3" keys and turn the power on. This enables the 100 MHz frequency digit entry.
__________________ | | | | | | | CPU | | | | | | | |________________| o [D7] o o o o [D8] o o o [D12] o D7 lower left pin is anode of one diode, lower right is cathode of the other. Top pin is common D12 upper pins are cathodes of diodes, lower is common anode. See text
__I_ | | |__| |/| | | |__| I
__I_ | | | | D? | | | | |__| I
WARNING: I have NOT tried the hardware mods and cannot vouch for them, so proceed at your own risk! I am told that the newer 24AT's (believed not to have made it to the US yet) will have the hardware mods in place, so only steps 5-7 will be necessary. So, try this first. Steps 5-7 don't seem to have any effect on a 24AT without the correct hardware mods. BTW, this has been attempted on 2 units with serial numbers around 1000 and mid-1100's, neither of which worked. :-( Like I said, the ones with the mods aren't here yet. There are 5 screws to remove the case (5th is on the strap hook). Keep the top panel controls with the front of the radio, and be VERY careful pulling the back off because there are fine ribbon cables connecting the front & back. I don't think they'll take much flexing. Additionally, diodes D7, D8, and D12 are surface mount components. They contain 2 diodes connected to 3 pins. Diodes D7 and D12 are different configurations. I believe D8 and D12 are different, so I wouldn't put the removed D8 in the spot for D12. Since they are surface mount, removal of D8 may not be all that difficult for those with steady hands and a fine low power soldering iron, but adding D12 would be a bear. I know of no reason that small discrete diodes couldn't be used in for D12. D13 is a small but standard axial diode, and can be easily cut. It is for this reason I have not attempted the hardware mods. Now, if the referenced posting is correct, and only D13 needs to be

Note: a strong signal will be seriously distorted in AGC OFF mode. Implementation:

(IC-275) SSB RF Gain

Cut the lead (FM8V) conneted to (pin5, J6, potmeter PCB, green) about 4 cm from the plug Connect the short plug end with R14 (on the potmeter PCB) by soldering it to the end that is connected to the plug (+8V) This will enable the FM RF GAIN in SSB/CW.

(IC-275) Tuning speed

This modification is read 679 times.

29-10-1998

(IC-275) Splitting into RX- and TX paths
This modification is read 691 times.
(IC-28) ICOM IC-28A AND IC-28H ext frq
To make the IC-28 transmit 138-174 MHz, cut D21 (no retuning required). D21 is a tiny glass diode standing on-end near the center of the upper circuit board, accessible by removing the top cover. The IC-28 is the only convertible ham rig I know that covers the 170-MHz federal government (including national park) frequencies. [source: W9MKV] Date: 16-01-2002 Subject: no cut 28-H mod The 28-H can be modified by removing a wire from a connector that connects to d21. Simply trace the circuit from d21 to the connector and pull the wire out by pressing the small metal tab on the connector and wrap it in electrical tape. The radio then can easily be "unmodified" by simple plugging the wire back into the connector. Unsure of pin# or connector number as I modified one over 10 years ago, and didn't bother to note pin or connector number.
This modification is read 1294 times.
From: Giovanni Luce, N8IWK
(IC-28) The long, noisy squelch-tail of the Icom IC-28
The long, noisy squelch-tail of the Icom IC-28 (A or H model) 2-meter transceiver can be shortened by replacing C110 (4.7 uf) with a smaller value (0.1 to 0.47 uf). (I can't remember the source of this information.) I put a 0.33 uf in my IC-28H; it's a very worthwhile modification. The capacitor is on the bottom board (the one with the lithium battery), just southeast of IC4 as you face the front of the upsidedown radio. The only difficult part is finding the right p-c pads to desolder on the back of the board. To remove the board: Remove bottom plate, unplug speaker. Unplug coaxial antenna connector (gray wire). Other connectors may remain in place. Remove 5 mounting screws, one in each corner and one near center. Tilt the board out of the radio. The button in the upper left corner is CPU reset; you may have to reprogram the memories if it is pressed. Remember that, although the radio is off, parts of the circuit are live so be sure not to short any part of the board during the modification.

(Cecil A. Moore~) writes: > In article 1995Nov8.090310.1@ntc01.tele.nokia.fi, > harjula@ntc01.tele.nokia.fi 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 (?) 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 S-meter on each frequency:
MHz 185 uV/LP.30 uV/BP 2.5.15.11 140
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 modification is read 566 times.

18-06-2000

(IC-729) Using two Icom rigs in transceive
Author: Richard Mekka - richard@mekka.freeserve.co.uk.MODIFICATION.NET
I have an IC729 and a R72 rx in the shack here, and I wanted to try some experiments with using separate aerials for receive & transmit. Getting the two pieces of equipment to "talk" to each other using the CI-V interface was no problem, but try as I might I could not see a way to prevent a master-master situation i.e. turning either tuning knob caused the other rig to follow. What I wanted was a master-slave set-up; in my case the IC729 to control the R72 but NOT the opposite. This would mean that having started a QSO I could use the receiver for split operation, or as a kind of RIT. Initial thoughts consisted of having a switch to break the CI-V line as and when transceive was not needed, but this wasn't very elegant and would involve lots of switching on and off. Then I had a great idea. What common electronic device lets signals pass one way but not the other? Correct! The good old humble diode! A quick lashup proved that my theory was right. The 0.7 volt drop does not effect operation of the data signal in the desired direction, which is a little surprising as the signal is only a 2 volt signal (unterminated) to begin with. Maybe the fanout is reduced with the diode fitted, but I have been unable to test this. In the end I made up a lead with the diode in series with the coax "inner", inside one of the jack plug covers Don't bother trying to work out which way round to solder it: if control is the wrong way reverse the lead. It's probably worth marking the lead so that it isn't used for audio work - might cause a few strange effects!
(IC-729) Modification Icom IC-729: General coverage TX
Open up the radio and locate the pll board, cut diode D5. The board should be located on the left hand side at the rear. Reset the cpu by pressing function and the mw button together while turning the radio off and on again. That will give you tx coverage from 1.6 to 30MHz!
This modification is read 661 times.

05-10-1998

(IC-730) Preventative Maintenance for the ICOM IC-730
Though the IC-730 is a good-performing, reliable radio, many of these units have been in service for a number years and are beginning to show their age. The following preventative maintenance procedures should be done to all IC-730's that come in for repair. You will find that when you take a few minutes to attend these minor details while the radio is on your bench, your returnrepair rate for the IC-730 will be almost nil. 1. On the RF unit, resolder the connectors at J2 and J3 on the RF unit. Due to the relatively thick coax cables on the connectors, these joints tend to crack with age and cause intermittent transmit and receive problems. 2. Make sure the receiver preamp works. If inoperative, replace relay RL1 on the RF unit. Install the factory update to prevent relay failure 3. Check transistor Q5 on the RF unit. If it is a 2SC945Q, replace it with the improved 2SC2878B to prevent spurious output from the transmitter and failure of the driver transistors. If Q5 is a type 1636, it doesn't need to be replaced. 4. Clean the RIT pot and switch with tuner cleaner. These controls are usually noisy and erratic, making the RIT hard to use. 5. Tighten the chrome-plated PC board mounting screws. The type of screw and spacer used in the IC-730 tends to come loose if the radio is used in a high-vibration, mobile environment. Don't forget to tighten the screws on the logic and IF units located beneath the main unit. 6. Check the bandwidth coupler for proper tightness. Tighten as needed.

This modification is read 1070 times.

From: Chris

(IC-775) New product information IC-775DSP
Icom's new superior class HF transceiver the IC-775DSP is designed as a successor to the IC765. The IC775DSP offers high quality receive and transmit audio for serous DX'ers. In addition, a non-DSP type, the IC775, is also available. DSP (Digital Signal Processing; DSP-type only) DSP digitally transposes transmit and receive audio signals to produce desired AF frequenca characteristics and in addition performs the following functions:
Noise reduction - DSP converts all analog audio components to digital components, then seperates them into voice and noise at the digital stage. In this way, voice components can be singeld out and demodulated back to analog signals so that weak signals that would normally be drowned out by noise are audible. The reduction level can be adjusted to obtain the most desired audio characteristics. PSN modulation - PSN method (Phase Shift Network) generates SSB signals directly without DSB signals or SSB filters. Therefore even audio characteristics, over the entire range from low to high audio components, can be obtained, as well as high quality audio without filter group delays. Automatic notch filter - automatically suppresses the highest level beat signals in the audio frequency. Twin PBT - One of the more highly praised funtions of the IC-781 - twin PBT narrows the IF-passband in two stages to efficiently eliminate interfering signals. This function is especially useful during crowded band conditions such as pileups, contests, or for nets, etc. IF Notch - The IC-775's notch filter funtions at the IF stage, therefore, sharp and deep filter characteristics are obtained as with the IC-781. Automatic Notch (DSP-type only) - An automatic frequency adjusting notch filter ia available at the AF stage seperate from the IF notch. This automatic notch reduces the maximum beat level with no manual adjustment necessary. APF (Audio Peak Filter) - Allows a particular frequency to pass through at the AF stages. This function is convenient for CW operation. In addition, CW pitch is also related changed with APF. Dual Watch Funtions Dual watch monitors 2 frequencies on the same band simultaneously. Ideal for contests, traffic handling, DX chasing and net control work. To operate the dual watch, the IC-775 has two PLLs, two RF circuits and a balance control to balance signal strenght. Twin Tunning Knobs For convenient dual watch operation, the transceiver has two tuning knobs. The large main knob has good tension and response; the small, independent sub small knob can be used to watch a sub frequency. Newly designed PLL A new design is employed in the PLL circuit using ICOM's DDS technology and removing mixer circuits, resulting in higher quality C/N characteristics and superior spurious rejection. Power MOS FET's for clean signal. Superior 3rd, 5th, 7th IMD characteristics are oblaimed by power MOS FET's with high voltage. The IC-775 employs power MOS FETs in the pre-driver, driver and final amplifier stages, providing a clean 200 W of output over all bands.

Turning this board over with the LCD now facing you there is position for 7 SMD diodes marked A or A2 on the right hand side just above the central mounting point. The easiest way of removing them without damaging the assembly is to desolder one end with desoldering braid and the while heating the contact with the soldering iron lift that end with a small pointy screw driver (0.7mm jewellers are good!). They just need to clear the board by a fraction and then they can be easily reinstalled if necessary. Reverse this procedure to reassemble and be bloody carefull!!!. Cheers ERIC. Many tnx to Eric for finding the programming diodes. In the European version (IC-Q7E) there are 3 diodes mounted. Counting from the screwhole, there are # 1,3 and 7 installed. Number 1 sets the VHF tx range to 144-146 MHz. Number 3 sets the UHF tx range to 432-438 Mhz. Number 7 enables the facilities dedicated to the E-version, 1750Hz etc. So, if You want to keep the E-version don't remove #7. Removing #1 and 3 enables tx range from 136-174 and 400-470 MHz. For expanding only rx at the celluar band on 800 MHz, it seems to be another mod. too. Take a look at ZANA's home page www.alles.or.jp/~zana/index.htm if you are keen on Japanese.
This modification is read 3070 times.

23-03-1999

(IC-Q7) Icom Q7A mods from the factory
I have received the mods for the Q7A radio from Icom. You will have to take dissasemble the radio by : 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Removeing the batteries Removeing the 2 screws in the battery compartment Remove rear cover Desolder and remove the back board Remove the last screw on right side of radio Remove the antenna and volume knob and the two nuts Desolder the speaker leads Slide main board out Hold board that faces the front of the radio towards you Remove the SMT (s) as per ic-q7a.gif image Reassemble Reprogram
I have tried this on my radio and it works just great. TX is from 140 Mhz to 170 Mhz and 400 Mhz to 470 Mhz with no degradation in the receiver or transmitter. I also placed the radio on a service monitor and specs were the same as manufacturers specs. ( except the transmitter He He He ) Be careful and have fun, Any questions about this mod please feel free to E~Mail me anytime. Ray N2ZEM
This modification is read 2973 times.

(IC-W2A) IC-W2A Expand frequency
This is less of a mod than it is a function. To expand the receiver frequency range of the new Icom IC-W2A to 118.00-170.00, 322.00-513.00, and 800.000-970.000, do the following: Hold down the Light, B, and # keys while turning the power on. That's actually a four button sequence, since power on is controlled by a keypad button.
This modification is read 1120 times.
(IC-W2A) IC-W2A Cross Band Repeat Function
To access the cross-band repeat function, first perform the extended receive mod by holding down the Light/B/# keys while turning on the power. To enable cross-band repeat, set each band to the frequency and mode desired. Set the current band to VHF. Press (Function-2) (Function-Enter) and the little "L" indicator will flash. The radio is now in the cross-band repeat mode. Do disable, press (Function-Enter) again.
This modification is read 947 times.
(IC-W2A) IC-W2A Extended Transmit Mod
Call the ICOM parts department ((206) 454-8155) and order a pair of MA133 diodes (P/N 1790000850). These are the three terminal surface mount diode packages. It is probably not advisable to substitute conventional leaded glass diodes here due to size restraints.
3 +--------+--------+ +-->|----->|--+ +-+-------------+-+ 1 2
The modification involves removing one surface mount component and installing two others. The working parts are extremely small and the mod should not be performed unless you are comfortable with working while using a loop eyepiece or other magnifying device. This is a "surgical" operation. Take all the usual precautions with respect to static electricity, etc. Remove 5 screws holding back on, and two screws on side of case below the PTT switch. Gently pry the unit apart. Inside the unit are two RF "stack" units. The complete RF "stack" is composed of two enclosed sheet metal boxes sandwiched
together, about 1.5" wide, 2" tall and.5" thick. Each RF stack unit (one per band) is totally self contained, is about.25" thick, and plugs into the "motherboard" using connectors mounted on one end. First, remove the stack units. To do this, remove one screw from each side of the stack. Remove the single screw off the bottom end of the stack and gently remove the metal spring clip holding the stack together. Carefully lift each stack unit out by pulling it back and down. They should easily unplug from the upper motherboard. Set them aside for now. At this time the back side of the front panel is clearly accessible and the two CPU's are visible side-by-side across the top. Now refer to the following illustration: Top of Radio, Back side of Front Panel
_____________________________________________________ -------| | | CPU-1 | | | ---------------------.<: <-D1. D2-> V D3->. V. V <-D? ---------| |fuse | | ----------------| | | CPU-2 | | | -------| | |--| | | P | | T | | T | | | |--| | | | | | | |

_____________________________ |_ ic341 ic201 o ic5 flat cabel HHHHHHHHHHHH ______________________________| o | 5| |__ | | O | _| __|__ |diode| |_____| | | | O_|

WARNING!

1=D528, 2=D52, 3=D525, 4=D523, 5=D531 All diodes have 3 legs! Then push for RX expand. Crossband repeater function is possible on the IC-W32E but it dosent work on my radio. It depends on witch CPU U have. But U
could always try it. Set VHF and UHF FQs, turn tone squelch on, turn lock function on, turn off the tranciver, push [SQL], [MAIN] and [BAND] keys and turn power on. E-mail: sm6vit@hotmail.com.MODIFICATION.NET sm6vit@swipnet.se.MODIFICATION.NET packet: sm6vit@sk6yw.o.swe.eu
This modification is read 2327 times.
(IC-W32) To extend the receiver and open up 800 MHz receive (cellular blocked) for IC-W32A
Turn off the radio Press and hold the band and squelch buttons. Turn on the radio while holding these buttons, wait for 5 seconds before you release the band and squelch buttons. Now the receiver should be opened up as far as it will go.
Date: 31-12-2001 Subject: All IC-W32-A Pushbutton Mods

From: Scott KF4JDP Terry

Not functional any longer,Tried all of them and none of them work. If anyone has an explaination please E-MAIL me Thanks Scott 73 Date: 22-03-2002 Subject: IC-W32A Firmware Change Apparently Icom made a firmware change at some point to comply with FCC guidelines regarding cellular telephone reception. There may have been other issues relating to it, but the short version of it is W32A's after a certain point no longer had the "super-extended" receive the earlier units did. It usually revolves around cell-phone reception though. I mean, God forbid if we overhear someone order a pizza or something. R. Evans KE4RWS
This modification is read 2466 times.
From: Randy Evans, KE4RWS

12-09-1999

(IC-W32) IC-W32 TX modification. Only a picture.

03-02-2001

(IC-W32) ICW32 E Crossband repeater
Author: Dr. Werner Furlan - furlan@gmx.net.MODIFICATION.NET
A. Aktivieren des Crossband-Repeater-Betriebs beim Handfunkgeraet IC-W32E: 1. VHF- und UHF-Frequenzen einstellen. 2. Squelch-Funktionen in beiden Baendern auf Rauschunterdrueckung stellen. 3. LOCK aktivieren. 4. Ausschalten 5. SQL+MAIN+BAND gleichzeitig gedrueckt halten und einschalten. Schluessel im Display blinkt. B. Deaktivieren des Crossband-Repeater-Betriebs: SQL halten und LOCK druecken. 73! Werner OE9FWV

Connect the NTC, FAN and power and adjust with P the voltage the fan gets (6.5V at 20 degrees celcius). Just trie it and You will be amazed (and think by Yourselve why did'nt came ICOM up with that idea). The cost for all of this was just $10 us dollar and 1 hour of work. Thanks to C@rlos for sending me the schematics. When You turn on the PS85 the fan will start at full speed (to remind You how noisy it can be) after about 2 seconds it will slow down. I thought about replacing the red LED in the front for a dual colour one so You can see what the fan is doing but decided not to that (yet). Any suggestions ? Just e-mail me: pe3hmp@hotmail.com.MODIFICATION.NET
This modification is read 423 times.
(R-1) R1 (and IC-nSAT) Owners Note
R1 Tech Note #1 (c) 1991 Paul Flaherty The BNC connector on most HTs leaves something to be desired, and the R1 and cousins are no exception. The connector nut and the back case form a smooth - smooth metal boundary, and the connector eventually will come loose. If this happens to you, do *not* merely retighten the nut. Instead, take it off, place a lock washer underneath the nut, and *then* retighten. If you don't, you'll wind up with a cycle of loosening and retightening. This is not a good thing, since the wire connecting the BNC to the PC motherboard is solid, and the solder connection leaves something to be desired. If you've already managed to twist the wire loose from the PC board, all is not lost; the wire may be reattached. WARNING: The following instructions are *NOT* for the faint of heart. If you have *ANY* doubts about your technical abilities (especially soldering), find someone experienced with repair of handheld radios to do it for you. You'll need: A low wattage soldering iron, preferably cordless The soldersucker of your choice
A very small phillips screwdriver (the smallest standard Craftsman will do) Some fresh eutectic solder, thin variety An anti - static wrist strap Mouse clips or a small pair of needle nose pliers Strap yourself in. Doubtless, the R1 can be zapped by static. 1. Take out the two long screws on the upper right of the back case, the small screw in the upper right of the front case, near the tether hole, and the two screws in the bottom of the front case. 2. Separate the front case from the rest of the radio. There is a printed circuit ribbon connecting the front case to the motherboard, and the ribbon is located on the right (viewed from the front) side. 3. Remove the four phillips screws which hold the motherboard to the back. 4. Now, a few notes on how the R1 is put together. The gray plastic plate, on which the three controls on top of the R1 (squelch, volume, tune) are mounted, slides free from the back case. The gray plastic plate, the controls, the power and speaker jacks, and the motherboard all remove as one piece (thank the Great Engineer). 5. Remove the 300 maH battery by pulling toward you (it's held in place by a metal clip) (and note that it's nicely connectorized for replacement somewhere down the road). Now, pull on the lower (eg, the part that was nearest the battery) portion of the motherboard, while pushing the power and speaker jacks thru the holes, and then lift up on the gray plastic top piece. The whole mess will come free. Take note of the small piece of rubber which fits between the motherboard and the back case. This forms the shock mount for the board. Also note the small piece of gray rubber which forms the light/lock pushbutton. 6. Take a breather, or have the nurse sponge down your forehead. 7. Remove the BNC connector. Curse loundly. 8. Remove the solder and wire from the PC board hole (in the corner of the board). 9. Reattach the BNC connector to the PC board. 10. Now for the fun part. Insert the BNC connector into the hole, while pushing the motherboard back into position, taking note to reinsert the gray pushbutton piece on the right side of the case (as viewed from the front). Refit the gray top piece. Place the small rubber shock mount behind the pc board, and reinstall the four screws (I used a pair of surgical mouse clips for this, but a pair of needle nosed pliers will do). 11. Reinsert the battery, replace the front cover, and reinstall screws. 12. Turn on. If you've done everything right, you'll have a working R1. If not, make sure you havn't pinched any wires in between the case halves. One final note: The antenna that comes with the R1 leaves a lot to be desired. Try using a Radio Shack PRO-34 scanner antenna instead; the improvement is impressive.

PARTS Q1/Q2 R1/R2 C3/C4

AFFECTED BOARD TYPE CHANGE TO NEW PART NUMBER 2SC 1214 DC to DC Board 2SC 2655 906-00385 3.3 KOHM DC to DC Board 5.16 K 915-01173 PF DC to DC Board 0.001 MF 50V 918-01500 ceramic cap Q11/Q12 Display Board 2SC2655 906-00385 R31/R32 3.3KOHM Display 5.16k Ohm 915-01173 C13/C16 Display 0.001 MF 918-01500
DETAIL PROCEDURE: 1. 2. 3. 4. 5. 6. Remove top and bottom cover. Remove front panel sub-assembly from main chassis of radio Remove the DC to DC board and replace components as listed Reinstall DC to DC board. Replace front panel sub-assembly onto main chassis of radio Replace top and bottom covers.
ESTIMATE TIME TO COMPLETE IS 1 hour
(R-7000) IC-R7000 scanning improvement
With the scan delay control in "off" position, the scan function resumes immediatly when the signal heard disappears. Consequently, you lost a two-way communication until the next memory scan has occured. On the ICR7100 this feature has been corrected, and the scan function resumes approximately 2 seconds after the signal has disappeared. Here is a simple tip for getting the same resume condition on the ICR7000. On the main unit, there is a signal called "stop" which is available and used by the logic unit. The modification is done by using a monostable multivibrator wired for retriggerable condition on a trailing edge ("stop" signal). The corresponding diagram is drawn below.
from main unit (+9V/W25) R1: 1 K : R2: 100 K : : (K) Pot: 220 K Zener : Cap: 47 uF : tantalum :.. Zener: 3,9 V : : : : : : : gnd. : D1: 1N4148 : R1 : : : : D2: 1N4148 : : : : IC: CD4528B : gnd (IC) : (K): cathode : : : + :. : : : : : : : Cap : : : : : : : : - : : : gnd : : gnd : : : : : : : : :.: : : : :..D1.(K). : : : : : : : gnd : : :.D2.(K).: : : : : : :.Pot.R2.: : : : : : : from main unit : : : (stop OUT / W37 bottom) :.. : from main unit (stop IN / W37 top)
All the components are mounted on a small PCB. This PCB is installed behind the S-meter, close to IF board. Power is supplied through link W25. This link is located on main unit near diode D25. The input/output stop signals are picked on the two edges of link W37 (you have to open it). Top of W37 (close to W9) is the IN signal. Bottom of W37 (close to W11, W12) is the OUT signal. Link W37 is also located on main unit (left vertical PCB). It is not necessary to remove the main unit board. You can solder the wires directly on the components side. Please note that IN/OUT signals are TTL levels, so the DC supply for the IC is about 5 volts (through 3,9 V zener diode). Delay can be set between 2,5 and 6,5 seconds by adjusting the potentiometer.
(R-7000) Intermittent display
Author: Burt I. Weiner - biwa@pacificnet.net.MODIFICATION.NET

OPTION 2 CHANGES ARE IMPLEMENTED EXACTLY AS DISCUSSED IN THE PRECEDING TEXT EXCEPT THE "NARROW" FILTER SWITCH IS USED INSTEAD OF THE "BOTH SWITCHES IN" CONFIGURATION TO ACCESS THE ADDITIONAL BANDWIDTH. THIS OPTION MAY ONLY BE USED IF NO CW NARROW FILTER HAS BEEN INSTALLED IN THE RECEIVER.
A. Remove the top cover of the receiver. B. Turn ON the filter switch (S1) on the main PC board. S1 is a small slide switch not far from the center of the board. C. Locate D37 on the main PC board right next to IC3 near the center of the board. Cut the top (cathode) lead of the diode, leaving enough wire on both sides of the cut to make connections to. Bend the wire lead on the diode up. Solder a jumper wire from the cathode lead of D37 to the cathode (top) lead of D39 (located on the opposite side of IC3). D. PERFORM THIS STEP ONLY IF YOU WISH TO MAKE THE "IF-SHIFT" MODIFICATION FOR THE SSB/CW/RTTY "BOTH SWITCHES OUT" POSITION, AS DISCUSSED IN THE PREVIOUS TEXT. IF YOU ONLY WANT THE EXTRA AM BANDWIDTH, SKIP TO STEP "E." Cut the top (cathode) lead of D44, leaving enough wire on both sides of the cut to make connections to. Bend the wire lead on the diode up and solder a jumper wire from it to the top (cathode) lead of D42 (located near filter switch S1). E. Cut the top (cathode) lead of D46 (located a little toward the front of the main PC board). Make sure the two clipped leads are not touching. F. Locate D45 on the main PC board (near IC3). Cut the top (cathode) lead of the diode, leaving enough wire on both sides of the cut to make connections to. Bend the wire lead on the diode up. Solder a jumper wire from the cathode lead of D45 to the lead sticking out of the PC board which was clipped from D44. If step D was not performed, then solder the jumper to the cathode (top) lead of D44. G. Inspect your work and verify all steps were done properly. Make sure all tools are out of harm's way. Reconnect power, antenna and an external speaker, and test the modification. You should now have the following bandwidth settings:
AM wide. AM normal. SSB/CW/RTTY wide. SSB/CW/RTTY normal.. or SSB/CW/RTTY normal.. 6 KHz 2.8 KHz 2.8 KHz 2.4 KHz 2.3 KHz (CFW455IT) [no change] (FL-70/CFW455IT) (FL-70/CFW455IT) [no change] (FL-44A) [IF-shift, if step D was performed] (FL-30/FL-44A) [no change, if step D was not performed] (FL-30/FL-44A)