Modifications for the ICOM - RogerK

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19-07-1998(IC-04) Audio modification for IC-02 AND IC-04This audio mod works on the 02 and 04AT. It increases the level of audio, as well as rolling off some of the lows. Sounds realnice. It involves the circuit around Q105.1. Replace C119 with a .01 uF cap (disc ceramic is fine).2. Parallel R131 with a 1 uF cap (use a tantalum cap).3. Parallel R132 with a .01 uF cap (disc ceramic is fine).This is not the same mod as the one International Radio is advertising, which involves changing C117.I tried an AB-1 Audiolaster from Engineering Consulting, and was very unhappy with the results. I am very pleased with theaudio given by this mod (much cheaper too!).This modification is read 564 times.top of page19-07-1998(IC-04) Low audio speaker mike on IC2A, 3A, 4A OR 02ATIf you own one of the IC2A, 3A, or O2AT series Hand-helds, you may be interested in reading on. I know my hearing is prettygood, but have you ever tried to listen to the audio coming out of your speaker mike on the above ICOM's? For the most part,it's pretty low. I may be the last guy to figure out a cure for this, but here it is anyway. On the O2AT, etc., there is a groove onthe back near the top of the rig that is just the right size to accept the HM9 speaker mike turned 90 degrees so that the mikeplug fits in that groove in the rear of the rig. Thus alllowing all the audio to be heard from the internal speaker of the rig, usuallymuch better than the speaker mike.Now, in the case of the 2A series, etc., the fix is more complex. These rigs don't have that handy groove built in, so I decided agroove had to be made to accept this configuration. I thought long and hard about a minute, before getting the "Dremel" out andmaking my own slot or groove. It works well on both hand-helds I have. In fact, you can hook up an external speaker for evenmore loudness in the auto. So, give it a try or see me for a demo.This modification is read 556 times.top of page19-07-1998(IC-04) TX delay may be excessive at low temperaturesModel:Division:Note:IC-04ATAmateurThis service bulletin is meant for technical personnelwith experience working on solid state communicationsequipment. Damage caused by improperlyinstalling this modification may causeICOM to charge for subsequent repairs to theproduct. ICOM does not warrant this modification.Bulletin #: 02988-002Date: January 1, 1988Subject:Transmitter delay may be excessive at low temperatures(can be up to 2 or 3 seconds).Procedure1. Remove the front and rear covers.2. Remove the volume and squelch knobs by pulling up on them. Push down the high/low power and lamp switch. Remove thefour screws in the metal chassis corners. Unfold the chassis.3. Replace R262 (currently 560K) with a 2.2 Meg resistor (ICOM P/N 915-01277).4. Reassemble the radio.
This modification is read 553 times.top of page19-07-1998(IC-04) IC-04E fuer 9k6Hallo,hier nun ein Gif-Bild, aus dem man die Einspeis/Abgreifpunkte für 9k6 ersehen kann.Ausführlichere Erklärung (Um das Gehäusezu öffnen schraube man...) spare ich mir, da ich jedem Amateurfunker soviel Geschick zutraue..hi Das ganze funktioniert ganzgut, allerdings sind noch keine Langzeit- erfahrungen bekannt.Gewährleistung, welcher Form auch immer, wird natürlich nicht übernommen.This modification is read 594 times.top of page01-04-2001(IC-1200) Expanded RF 870 - 960 MHz for ICOM IC-1200Author: John kb2ljj1. Remove power and antenna.2. remove screws and open the radio.3. Locate and CUT resistor R-52 on logic " A " unit.4. Install NEW antenna connector to position J2 on RF board. Note: a different antenna is required for the 870-960 bands.5. Reassemble the radio.6. Reset the microprocessor. ( Hold down the tuning control and Turn the power ON ) or ( Insert a toothpick in hole in thecorner of the bottom cover.)Adjustement: R-8 Low TX power and Hi TX power All the MODS are captured by Packet. KB2LJJ73s John kb2ljjThis modification is read 353 times.top of page
Page 1 and 2: Modifications for the ICOMcreated 2
Page 3 and 4: (IC-271)(IC-271)(IC-271)(IC-2710)(I
Page 5 and 6: (IC-475)(IC-475)(IC-475)(IC-475)(IC
Page 7 and 8: (IC-756pro) Expand tx-freqeuncy for
Page 9 and 10: (IC-W2E)(IC-W31)(IC-W31)(IC-W31)(IC
Page 11 and 12: 2. After about 0.5 second, press st
Page 13 and 14: 21-10-1999(AT-500) ICOM AT-500 Tune
Page 15 and 16: 4. Program the radio to the local w
Page 17: 19-07-1998(IC-03) ICOM 02/03/04 & V
Page 21 and 22: 6. Reinstall the RAM board into the
Page 23 and 24: 27-10-1998(IC-1275) Power control m
Page 25 and 26: 27-10-1998(IC-1275) Modification of
Page 27 and 28: ●Connect the short plug end with
Page 29 and 30: This modification is read 1316 time
Page 31 and 32: 50MHz to something like 204MHz cont
Page 33 and 34: 26-07-2001(IC-207) Band Expansion f
Page 35 and 36: This modification is read 4219 time
Page 37 and 38: Fig. 3: The circuit extract from IC
Page 39 and 40: 19-07-1998(IC-22) Icom IC22S Packet
Page 41 and 42: This modification is read 739 times
Page 43 and 44: More detailed:In the true spirit of
Page 45 and 46: 19-07-1998(IC-229) IC-229H Fix CPU/
Page 47 and 48: In addition, if you want to put an
Page 49 and 50: By diode:●●Remove D17 diode on
Page 51 and 52: 1. Remove diode D14 (if there is an
Page 53 and 54: cut... I'm guessing, but it could b
Page 55 and 56: 19-07-1998(IC-24) IC-24AT enabling
Page 57 and 58: 19-07-1998(IC-24) Tip to to functio
Page 59 and 60: This complete the mods done with su
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Page 63 and 64: Comment:These TRX is accorded to my
Page 65 and 66: this mod of use as I have.Any comme
Page 67 and 68: 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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This modification is read 748 times
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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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This modification is read 2320 time
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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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