Modifications for the ICOM - RogerK

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---- gar keine Diode ----Breitband mit Ton-EncoderUSA: 144-148 und 430-450 Subaudible Tone-EncoderEUR: 144-146 und 430-440 1750HzBreitband:136-174 und 420-460 (RX und TX)Daher:Alle Dioden bis auf D102 entfernen. Wird auf den 1750-Tonruf verzichtet, auch D102 entfernen, so daá alle Dioden entfernt sind.Es geht dann der Subaudible-Ton-Encoder (nicht ..-Decoder!).Ergebnis: RX/TX-Breitband w.o., FM-Raster 5kHz/1kHz in VHF und UHF.Es empfiehlt sich ein CPU-Reset mit Neuparametrierung.Wegen der SMD-L”terei braucht's schon ein ruhiges H„ndchen, den richtigen L”tkolben mit der passenden Spitze, eine Pinzette,ggf. Arbeitslupe und zur Beruhigung einen Schluck Bier vorher (oder zwei).Alle Angaben ohne Gew„hr - versteht sich!Quelle: IC821H Service-ManualThis modification is read 801 times.top of page05-10-2000(IC-821) ICOM IC-821H X-Band modAuthor: Mark - pe3hmp@hotmail.com.MODIFICATION.NETThis mod can also be found on www.qsl.net/pe3hmp.On this page is the x-band (crossband) repeater mod discribed for the ICOM IC-821h allmode dualband tranciever with photo'sI have not done this mod myselve (yet) the schematics come from ICOM europe and the mod has been tested by WolfgangDJ9JY.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 to solder a diod in to the space reserved for D108.(1ss355) You can use one of the diods you have removed (d101-d107)As far as I know D108 is never in place as it leaves the factory.If this is Your first attempt to solder annything I would suggest to leave it untill You have alot of practiceIn this drawing You see were D108 should be placed
Click for big viewThis is a colour photo were the diodes can be found , D108 is on the left, D101 is on the rightAfter soldering D108 into place you will have to do the following to get the x-band repeater to work:1. Turn ON the power switch.2. Set the both band desire frequency at dial3. Set [LOCK] function (see instruction manual)4. Turn OFF the the power switch5. Push [M/S] key and turn on power switch.6. You can stop pushing the [M/S] key now (LOL)This enabels the x-band repeater
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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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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
Page 192 and 193: 13-01-2002(IC-746) Monitor Audio Ou
Page 194 and 195: This modification is read 1499 time
Page 196 and 197: 19-07-1998(IC-751) IC-751 Bad Cap P
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
Page 212 and 213: 23-11-2001(IC-756pro2) IC-756PRO2 T
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
Page 220 and 221: 11. Re-install board and all cables
Page 222 and 223: The Yaesu FT726R first appeared ten
Page 224 and 225: There seemed to be no way of changi
Page 226 and 227: Add a diode on the blank position b
Page 230 and 231: To disable the x-band repeater just
Page 232 and 233: Well this should make things verry
Page 234 and 235: Set radio in VFO mode, and select f
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Page 238 and 239: ●●●350-470 MHz RX/TX800-950 M
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Page 244 and 245: 1. You're completely successful.2.
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Page 248: 28-03-1999(IC-Q7) Modifying the ICO
Page 252 and 253: ●●●●●●●●Desoldering
Page 254 and 255: You should now have the RF board co
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Page 260 and 261: 1. Use an ohmmeter to determine whi
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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Page 270 and 271: Date: 30-12-2001 User comment From:
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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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