Modifications for the ICOM - RogerK

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To disable the x-band repeater just push [LOCK] to release lock function.This modification is read 899 times.top of page17-02-2001(IC-821) Icom IC-821H modsAuthor: Mark - pe3hmp@hotmail.com.MODIFICATION.NETOn this page is the rx/tx modification discribed for the ICOM IC-821h allmode dualband tranciever with photo's. You can also findthis modification on www.qsl.net/pe3hmp.I have done this mod myselve but If You do annything wrong I'm not responseble !!You need to locate the row of diodes on the display board, for that You need to remove top and bottom covers of the 821(discribed in Your owners manual on page 50 and remove two screws witch hold the front of the 821 and turn the 2 other screws1/4 loose so You can pull the front towards You (about 5cm)Now You have enough space to carefully remove the diodes.can You find them ? (they are SMD diodes)Removing D101 gives You 136 - 174 Mhz (RX)Removing D103 gives You 420 - 460 Mhz (RX)Removing D105 gives You 136 - 174 Mhz (TX)Removing D107 gives You 420 - 460 Mhz (TX)And then You will have to make a choice: leaving the D102 diode in place for 1750Hz tone when You press the tone button onthe front, or if You remove D102 You can use the subaudio tones (like the ones used at some european repeaters) but no1750Hz tone.If this is Your first attempt to solder annything I would suggest to leave it untill You have alot of practice, make sure You have asmall soldering tip and some pliers then gently heat one side of the diode and lift that side up, I would suggest leaving the diodhanging there (only connected to one side) in case You want to restore the 821h to its original state.I removed ALL diodes so now I have RX/TX 136 - 174 Mhz and RX/TX 420 - 460 Mhz and subaudio tones.
On this photo You can see were the diodes used to be.After I had done the mod there occured a problem, the subtone's deviation was too high because the same pot is used for thedeviation of the 1750Hz burst tone in the european models, the deviation should be about 1/3 of that of the 1750Hz tone (about0.6Khz).If You have a second reciever just connect a voltmeter over the speaker of Your second reviever (not the 821) and note themeter readout then adjust R64 for 1/3 of the first signal (after the mod You now have a usa+ version).Were can You find R64 ? well just look at the following photo's and You will find the R64.Thanks to Amanda G7TUA / M0DZO for giving me the info about the subtones (I do not have the service manual yet).
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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
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19-07-1998(IC-475) IC-475 Freq. ste
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Problem:This is a general transceiv
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Note: a strong signal will be serio
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Das spart einen mords Haufen Arbeit
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Dieses ist mit dieser Schaltung als
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X . X . 5.0 KHz 1 0 1 0. . . . X .
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Remove the back cover. If you place
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27-10-1998(IC-575) SSB RF GainProbl
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26-06-2001(IC-575) Pass band Tuning
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The trimpot leads will need to bent
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19-07-1998(IC-706) Info/mods for IC
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¦ ¦¦ ¦¦ ¦¦ ¦¦ ¦----------
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●●●●●●●●●●●
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From: gary@ke4zv.atl.ga.us (Gary Co
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Mehr Dynamik in der Modulation beko
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Operation:Be sure to read the manua
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Alternative zum modifizierten PC St
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●●●●●(Another receiver wi
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| IC31 uPD4094BG || |1 2 3 4 |5 6 7
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D116 and D118 are responsible for o
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Transmit power output after modific
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This information and photos was sup
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22-02-2002(IC-706MKII) IC-706MKIIG
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Delete cap. CT14 at pin 6 of IC3 on
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Page 186 and 187: Also probably would apply to IC 735
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Page 190 and 191: John Schmitz NS8EAdditional informa
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Page 194 and 195: This modification is read 1499 time
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Page 198 and 199: inspect your job to be sure that th
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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:
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Page 218 and 219: 70% AM.My personal findings are tha
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Page 232 and 233: Well this should make things verry
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Page 248: 28-03-1999(IC-Q7) Modifying the ICO
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Page 262 and 263: 2. Remove battery cover and battery
Page 264 and 265: Fig. 4. Receiving AO-40 (at MA=13)O
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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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