Modifications for the ICOM - RogerK

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This modification is read 2320 times.top of page06-05-2001(IC-718) Modify IC-718#04 to IC-718#03Author: Jan SP2EXE - sp2exe@poczta.onet.pl.MODIFICATION.NETHow to change freqency coverage from version IC-718#04 to IC-718#03?It is easy to restrict the freqency range (to modify from #04 to #03)Remove D50 diode in the Logic board is enough.D50 is located close to D54.73 de Jan SP2EXE sp2exe@poczta.onet.pl.MODIFICATION.NETThis modification is read 1868 times.top of page19-07-1998(IC-720) ICOM IC-720 extended xmitTransmitter is unlocked by snipping the light blue wire that's at the very end of the top hatch cover to the left middle side of thetransceiver.This modification is read 1186 times.top of page
19-07-1998(IC-720) Modifying IC-720A to get rid of rotary relayI have just finished modifying an old IC-720A HF transceiver to replace the rotary relay filter control with a set of reed relays anda small digital circuit to select the appropriate relay and provide feedback to the existing CPU in the radio so it thinks it's still onthe rotary relay. The cost for parts was about $25; the cost of my time was slightly more than that, but it was "fun".The modification is so far successful, and the radio is much quieter in band switching as well as being more reliable (the oldrotary relay was impossible to get mechanically aligned correctly, leading to poor connectivity between the rx/tx and theantenna, as well as many missed stepping pulses).Summary: Use the step-pulse line to drive a small SPDT relay; use the SPDT relay to drive an R/S flip-flop (built from two nandgates) to provide a clean step signal (the existing step signal has some kind of very high speed clock train superimposed on itand therefore was not usable directly). Feed the pulse train into a CMOS decade counter type 4017. Take the appropriate decadeoutputs (active high) and recreate the switch-position feedback signals using a small diode matrix ala the original design. Alsouse the decade outputs through 33K resistors to turn on 2N3904 NPN transistors, which are used to select the appropriate (1 of7) DPST reed relays. The CMOS chips (the nand gates and the decade counter) can be had at Radio Shack and must be poweredfrom 9V (or so) because the radio does not use 5V logic (of course...)I mounted the reed relays inside the original low-pass filter subassembly, and the rest of the circuitry on a small perf-board nearthe SWR module (connected by ribbon cable).This is not a detailed design description but if you are interested I will provide more details. This project did ssalvage anotherwise-worthless IC-720A, but I don't think I'd do it again (rather time consuming, but perhaps you can benefit from myexperience and save some time).This modification is read 1146 times.top of page19-07-1998(IC-720) Amtor mods FOR IC-720AI present here again the mods for amtor operation for the Icom IC-720A transceiver.I received this infos in the year 1984-1985 !On my Icom IC-720A i did the first set of mods (by G4ICM) and now my Icom IC-720A works well in amtor and packet !I hope that this infos are useful for someone!73 DE IK3BVD OP.ENRICOMods for the Icom IC-720A:There are 4 sets of mods. Some duplication will be obvious.By G4ICMMain board:Change C40 C42 C43 C54 to 0.1 uFChange C69 TO 0.01uF.I.F. Board:C87 may be 33uF, but shown as 0.0047uF, which is on print side.Change C87 to 2.2uF, leave 0.0047 on print side.R.F. Board:Remove C169 C127. Change C165 to 0.47uF.Noise blanker update. (check if done)Change C116 to 10uFChange C171 to 0.01uFIf in difficulties call england 2273 63859By KB9ISDelete C40 and C43 on main unitChange C42 and C43 (10uF and 2.2uF) to 1uF.Disable A.F.Muting- link short-C69.
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Modifications for the ICOMcreated 2
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(IC-271)(IC-271)(IC-271)(IC-2710)(I
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(IC-475)(IC-475)(IC-475)(IC-475)(IC
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(IC-756pro) Expand tx-freqeuncy for
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(IC-W2E)(IC-W31)(IC-W31)(IC-W31)(IC
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2. After about 0.5 second, press st
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21-10-1999(AT-500) ICOM AT-500 Tune
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4. Program the radio to the local w
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19-07-1998(IC-03) ICOM 02/03/04 & V
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This modification is read 553 times
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6. Reinstall the RAM board into the
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27-10-1998(IC-1275) Power control m
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27-10-1998(IC-1275) Modification of
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●Connect the short plug end with
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This modification is read 1316 time
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50MHz to something like 204MHz cont
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26-07-2001(IC-207) Band Expansion f
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Fig. 3: The circuit extract from IC
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19-07-1998(IC-22) Icom IC22S Packet
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More detailed:In the true spirit of
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19-07-1998(IC-229) IC-229H Fix CPU/
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In addition, if you want to put an
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By diode:●●Remove D17 diode on
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1. Remove diode D14 (if there is an
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cut... I'm guessing, but it could b
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19-07-1998(IC-24) IC-24AT enabling
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19-07-1998(IC-24) Tip to to functio
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This complete the mods done with su
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Comment:These TRX is accorded to my
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this mod of use as I have.Any comme
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other wires come in. Take the cable
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17-11-2000(IC-2700) Enabling ICOM 2
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19-07-1998(IC-271) IC-271 / 471 fue
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RAM card version B images:This modi
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12-11-2000(IC-2710) Crossband Repea
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Note:From Bill K7RIEICOM has not tr
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19-07-1998(IC-275) Improve the stab
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●●●●●●●●●●remov
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Note: a strong signal will be serio
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19-07-1998(IC-28) The long, noisy s
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not a hard mod to do,..........but
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02-04-2000(IC-2800) IC-2800H cross
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19-07-1998(IC-281) Extended Receive
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encased it in shrink-tube. The oper
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push buttonswitch ^ ^| |___________
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19-07-1998(IC-2IA) IC-2IA lousey xm
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1. Change to RECEIVER MODE (not rec
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13.0V 5.0W12.0V 5.0W11.0V 5.0W10.0V
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MODIFICATION (Refer to figure 1.)1.
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Procedure1. Remove the covers from
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19-07-1998(IC-3200) Fix for IC-3200
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4. select a frequency of 150.000Mhz
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19-07-1998(IC-3220) How to iface Ic
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Now power on and type in the freque
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One note on the above - the BNC con
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e shorted to ground and cause PLL u
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19-07-1998(IC-451) IC-451 aus 9600F
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3. If by accident you lose power to
Page 125 and 126: 19-07-1998(IC-475) IC-475 Freq. ste
Page 127 and 128: Problem:This is a general transceiv
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Page 139 and 140: Remove the back cover. If you place
Page 141 and 142: 27-10-1998(IC-575) SSB RF GainProbl
Page 143 and 144: 26-06-2001(IC-575) Pass band Tuning
Page 145 and 146: The trimpot leads will need to bent
Page 147 and 148: 19-07-1998(IC-706) Info/mods for IC
Page 149 and 150: ¦ ¦¦ ¦¦ ¦¦ ¦¦ ¦----------
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Page 154 and 155: From: gary@ke4zv.atl.ga.us (Gary Co
Page 156 and 157: Mehr Dynamik in der Modulation beko
Page 158 and 159: Operation:Be sure to read the manua
Page 160 and 161: Alternative zum modifizierten PC St
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Page 172 and 173: This information and photos was sup
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Page 178 and 179: Delete cap. CT14 at pin 6 of IC3 on
Page 180 and 181: 18-06-2000(IC-729) Using two Icom r
Page 182 and 183: 19-07-1998(IC-735) IC-735 Remote Wo
Page 184 and 185: 19-07-1998(IC-736) Icom IC-736 DDS/
Page 186 and 187: Also probably would apply to IC 735
Page 188 and 189: RAM card version B images:This modi
Page 190 and 191: John Schmitz NS8EAdditional informa
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Page 198 and 199: inspect your job to be sure that th
Page 200 and 201: 28-01-2002(IC-751) ICOM IC-751 Dual
Page 202 and 203: Step 8: Turn the radio off and inst
Page 204 and 205: To be neater you could remove the s
Page 206 and 207: [W804] | |Remove=>[W805] | CHIP |[W
Page 208 and 209: Date: 23-02-2002 User comment From:
Page 210 and 211: less.The second way to adjust the I
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Page 214 and 215: 19-07-1998(IC-765) Icom IC-765 Pass
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Page 218 and 219: 70% AM.My personal findings are tha
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Add a diode on the blank position b
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---- gar keine Diode ----Breitband
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To disable the x-band repeater just
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Well this should make things verry
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Set radio in VFO mode, and select f
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27-05-2001(IC-910) Expanded functio
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●●●350-470 MHz RX/TX800-950 M
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1. You're completely successful.2.
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●●●●●●●●●Für Han
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28-03-1999(IC-Q7) Modifying the ICO
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●●●●●●●●Desoldering
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You should now have the RF board co
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BOOT:Attenuator protecs strong sign
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1. Use an ohmmeter to determine whi
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2. Remove battery cover and battery
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Fig. 4. Receiving AO-40 (at MA=13)O
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This modification can also be found
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The Q and not Q outputs on this IC
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Date: 30-12-2001 User comment From:
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Removing 1F unit1. Pull the 2 knobs
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16-05-1999(IC-T8) Problem with the
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800 -
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Frequencyrange after modification:5
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Offset Freq: Hold [FUNC], Press [4]
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The Icom IC W21AT handi-talkie norm
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19-07-1998(IC-W2A) IC-W2A signal le
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19-07-1998(IC-W31) IC-W31E CROSS-BA
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15-10-2000(IC-W31) Cross Band Repea
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could always try it.Set VHF and UHF
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31-07-2001(IC-W32) Icom IC-W32A pro
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IC-4GAT - Turn the radio on, hold [
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IC-M9 - Hold [HI/LO] & [DW/SCAN] bu
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IC-275H 10IC-375A 12IC-471 22IC-475
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I have tested this mod with a ic-75
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How further up the hole is the bett
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Connect the NTC, FAN and power and
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5, 31, 48, and 79.4. Does the Prior
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19-07-1998(R-7000) Modify your ICOM
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1. C231 from 1000 pf to 68 pf.2. C2
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19-07-1998(R-71) Tricking the ICOM
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There are two wires which send logi
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A. Remove the top cover of the rece
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08-11-1998(R-7100) Modify your Icom
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17-03-2002(R-7100) Icom R7100 Discr
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23-08-1998(R-8500) Operating the Ic
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Modifications for the ICOM - RogerK

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