Modifications for the ICOM - RogerK

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TX partChange X3 from 35.74417 to 34.912MHzChange X4 from 33.9275 to 33.095 MHzFor the 1.6 MHz repeater shift remove diodes D13 and D14For the display to show 430-440 Add diodes D15 and D16 (1n4148/1ss53)Adjusting the IC45 is easy, use the atlas toko to get the freq on 439.000 and then use the 5KHz shift knob and adjust the freqwith the red c58 trimmer to 439.005Be careful with the toko, the core can easily break !If You have a good signal generator it might be a good idea to align the rx although in most cases it is not necessaryUnfortunately I had no service doc of this rig.Thanks to PE3HMP for the modification and picture.This modification is read 435 times.top of page
19-07-1998(IC-451) IC-451 aus 9600Folgende Massnahmen sind erforderlich:1.Diskriminatoranschluss:Oberen Gehaeusedeckel abnehmen,dann erkennt man im hinteren Teil des Geraetes den Diskriminator-IC MC3357P.An dessenPin 9 ist der Anschluss zu taetigen. (evtl. ueber einen Schutzwiderstand von 5-10k).2.Modulatoranschluss:Unteren Gehaeusedeckel entfernen,die Treiberplatine loesen und hochklappen. Darunter werden 2 Weissblechgehaeusesichtbar.Das kleinere ist der 2.Mischer. Dessen Deckel abhebeln.An der Wand zur Mitte des Geraetes hin erkennt man dieVaricapdiode D1.Am Verbindungspunkt R7,R8,C6 und eben dieser D1 ist der An- schlusspunkt fuer den Modulator.Ich habe diese Punkte mittels RG174 an die 8-polige Mic-Buchse angeschlossen, und benoetige somit fuer die Verbindung TRX-Modem nur ein einziges Kabel.Der Schwachpunkt des IC451 liegt nach meinen Beobachtungen nur in der etwas traegen RX/TX - Umschaltung.Ein TX-Delay von unter 20 wird problematisch.Ansonsten laeufts aber recht gut. 73 + 55 de DG4FAA,Heinz aus Biedenkopf-BreidensteinThis modification is read 370 times.top of page19-07-1998(IC-471) VOX of an IC-271,471,1271 usable for FMHow to make the VOX of an IC-271,471,1271 usable for FM :1'st type of "main-board" :The only thing to be done is to add a diode such as 1n4148 or bax13 on the MAIN board on the position D74When D74 is inserted ... the vox works in FM also.The diode is on the shematic diagram of the Main board but is not mounted on the pcb in the factory.73's de stefaanON4BY @ ON4HU16/03/1990 18.31 h2'nd type :(On this board a D74 is present (near PA- and RF-YGR- Unit))(It might be not present in the plans !)Disconnect the cathode of D69 from it's old postition. It's new position is the cathode of D50 or D51name ! position on main board ! (old) function !D69 ! near "CW-DELAY". ! "FM -VOX-OFF" ! FM 8VD50 ! near "RF-YGR-Unit" ! "USB-VOX-ON" ! USB8VD51 ! near "RF-YGR-Unit" ! "LSB-VOX-ON" ! LSB8V20/03/1990 16.52 hThis modification is read 581 times.top of page19-07-1998(IC-471) 9600 baud mod for IC-471
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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
Page 69 and 70: 17-11-2000(IC-2700) Enabling ICOM 2
Page 71 and 72: 19-07-1998(IC-271) IC-271 / 471 fue
Page 73 and 74: RAM card version B images:This modi
Page 75 and 76: 12-11-2000(IC-2710) Crossband Repea
Page 77 and 78: Note:From Bill K7RIEICOM has not tr
Page 79 and 80: 19-07-1998(IC-275) Improve the stab
Page 81 and 82: ●●●●●●●●●●remov
Page 83 and 84: Note: a strong signal will be serio
Page 85 and 86: 19-07-1998(IC-28) The long, noisy s
Page 87 and 88: not a hard mod to do,..........but
Page 89 and 90: 02-04-2000(IC-2800) IC-2800H cross
Page 91 and 92: 19-07-1998(IC-281) Extended Receive
Page 93 and 94: encased it in shrink-tube. The oper
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Page 97 and 98: 19-07-1998(IC-2IA) IC-2IA lousey xm
Page 99 and 100: 1. Change to RECEIVER MODE (not rec
Page 101 and 102: 13.0V 5.0W12.0V 5.0W11.0V 5.0W10.0V
Page 103 and 104: This modification is read 748 times
Page 105 and 106: MODIFICATION (Refer to figure 1.)1.
Page 107 and 108: Procedure1. Remove the covers from
Page 109 and 110: 19-07-1998(IC-3200) Fix for IC-3200
Page 111 and 112: 4. select a frequency of 150.000Mhz
Page 113 and 114: 19-07-1998(IC-3220) How to iface Ic
Page 115 and 116: Now power on and type in the freque
Page 117 and 118: One note on the above - the BNC con
Page 119: e shorted to ground and cause PLL u
Page 123 and 124: 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
Page 129 and 130: Note: a strong signal will be serio
Page 131 and 132: Das spart einen mords Haufen Arbeit
Page 133 and 134: Dieses ist mit dieser Schaltung als
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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
Page 162 and 163: ●●●●●(Another receiver wi
Page 164 and 165: | IC31 uPD4094BG || |1 2 3 4 |5 6 7
Page 168 and 169: 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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18-06-2000(IC-729) Using two Icom r
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19-07-1998(IC-735) IC-735 Remote Wo
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19-07-1998(IC-736) Icom IC-736 DDS/
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Also probably would apply to IC 735
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RAM card version B images:This modi
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John Schmitz NS8EAdditional informa
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13-01-2002(IC-746) Monitor Audio Ou
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19-07-1998(IC-751) IC-751 Bad Cap P
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inspect your job to be sure that th
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28-01-2002(IC-751) ICOM IC-751 Dual
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Step 8: Turn the radio off and inst
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To be neater you could remove the s
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[W804] | |Remove=>[W805] | CHIP |[W
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Date: 23-02-2002 User comment From:
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less.The second way to adjust the I
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23-11-2001(IC-756pro2) IC-756PRO2 T
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19-07-1998(IC-765) Icom IC-765 Pass
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19-07-1998(IC-775) New product info
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70% AM.My personal findings are tha
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11. Re-install board and all cables
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The Yaesu FT726R first appeared ten
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There seemed to be no way of changi
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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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