Modifications for the ICOM - RogerK

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IC-275H 10IC-375A 12IC-471 22IC-475A 14IC-475E 14IC-475H 14IC-575A 16IC-575H 16IC-706 48IC-706 48IC-706MKII 4EIC-706MKIIG 58IC-725 28IC-726 30IC-728 38IC-729 3AIC-735 04IC-736 40IC-737 3CIC-737A 3CIC-738 44IC-746 56IC-75 5AIC-751 1CIC-756 50IC-756PRO 5CIC-756PROII 64IC-761 1EIC-765 2CIC-775 46IC-781 26IC-820 42IC-820H 42IC-821 4CIC-910 60IC-970 2EIC-970A 2EIC-970E 2EIC-970H 2EIC-1271 24IC-1275 18IC-R7000 08IC-R7100 34IC-R9000 2AThis modification is read 929 times.top of page
23-11-2001(MISC) QRP mod for ICOM transceivers/9-volt - o-------/ ------/////---------alkaline S1 R1 |battery + o-- || >| < shielded cable_____ variable R2--> > ALC--- < ------------------> JACK- > | || | ground | ON|__|| RADIO| |__________--- ---- -With this circuit connected to the radio, the power output is adjustable between 0 ---> 100W. For best results. leave the RFpower control at maximum and adjust for desired power using R2.S1 is used to turn off circuit when radio is not in use or QRP operation is not desired.Radio Model: R1 value R2 valueIC-761, 765 47K 20KIC-720(A), 735, 740, 745, 751(A), 275A/H 2M 1MIC-725, 726, 728, 729, 736, 737(A) 220K 100K06/01/94 CJRFor the IC-820H use the values for the IC-761, 765. The IC-781, IC-765 and the IC-820H all have the same ALC characteristics:Control voltage : -4 to 0 voltsInput impedance : More than 10 K ohmsThis modification is read 898 times.top of page16-04-2001(PS85) ICOM PS85 fan modificationAuthor: Mark - pe3hmp@hotmail.com.MODIFICATION.NETWhen I bought the icom PS85 power supply one thing inmediatly catched my attention, THE NOISY FAN.You would expect if You pay $450 usdollar (in the Netherlands) that this would be a great power supply and not a noisy one !Well after 2 day I decided that it was time to do someting about it, after contacting icom I heard that there was no mod. for it soI had to do it myselve.This mod is using a NTC to sense the temp and control the speed of the fan so the temp wil not exeed 50 degrees celcius.Potentiometer P is used to adjust the lowest speed of the fan (I set P so that the fan gets at least 6,5V at 20 degrees celcius)
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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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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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Page 258 and 259: BOOT:Attenuator protecs strong sign
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
Page 266 and 267: This modification can also be found
Page 268 and 269: The Q and not Q outputs on this IC
Page 270 and 271: Date: 30-12-2001 User comment From:
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Page 274 and 275: Removing 1F unit1. Pull the 2 knobs
Page 276 and 277: 16-05-1999(IC-T8) Problem with the
Page 278 and 279: 800 -
Page 280 and 281: Frequencyrange after modification:5
Page 282 and 283: Offset Freq: Hold [FUNC], Press [4]
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Page 286 and 287: The Icom IC W21AT handi-talkie norm
Page 288 and 289: 19-07-1998(IC-W2A) IC-W2A signal le
Page 290 and 291: 19-07-1998(IC-W31) IC-W31E CROSS-BA
Page 292 and 293: 15-10-2000(IC-W31) Cross Band Repea
Page 294 and 295: could always try it.Set VHF and UHF
Page 296 and 297: 31-07-2001(IC-W32) Icom IC-W32A pro
Page 302 and 303: IC-4GAT - Turn the radio on, hold [
Page 304 and 305: IC-M9 - Hold [HI/LO] & [DW/SCAN] bu
Page 308 and 309: I have tested this mod with a ic-75
Page 310 and 311: How further up the hole is the bett
Page 312 and 313: Connect the NTC, FAN and power and
Page 314 and 315: 5, 31, 48, and 79.4. Does the Prior
Page 316 and 317: 19-07-1998(R-7000) Modify your ICOM
Page 318 and 319: 1. C231 from 1000 pf to 68 pf.2. C2
Page 324 and 325: 19-07-1998(R-71) Tricking the ICOM
Page 326 and 327: There are two wires which send logi
Page 328 and 329: A. Remove the top cover of the rece
Page 330 and 331: 08-11-1998(R-7100) Modify your Icom
Page 332 and 333: 17-03-2002(R-7100) Icom R7100 Discr
Page 334: 23-08-1998(R-8500) Operating the Ic
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Modifications for the ICOM - RogerK

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