Modifications for the ICOM - RogerK

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John Schmitz NS8EAdditional information.After having put a forward reading watt meter on my 746 i have found that there is NO loss of power due to this mod. It is stillputting out the full 100 watts when you have a good match (5-100 on SSB and FM and 2-40 on AM).I have also discovered that the TX was NOT opened up above 54MHz to 60MHz the top end of the 6 meter band switch on the746.The only effect i have noticed is that sometimes while using the built in antenna tuner in manual tune the LCD display sometimesblinks or lights up with all functions showing or sometimes disappears below the line.Also the band edge beep function option no longer works because with wide open TX there are no more band edges.One must be carefull to stay within their operator band privileges. These are the only adverse effects i have noticed with Mr.Schmitz mod.This modification is read 4622 times.top of page25-10-2000(IC-746) Extended RX/TX for IC-746Author: - trout1000@squonk.net.MODIFICATION.NET●●●●●Open the bottom cover of the IC-746Place radio on surface upside down with front to your left.Find chip label HD6433042SFB24To the right of this chip (3/4 inch) are two rows of diodes.14 diodes in the right column and 7 diodes in the left column.For Icom 746 Radios with the diodes in the 1, 2, 6, 7, 9, 11 and 14 positions, remove numbers 6 and 7 leaving the other 5in place.Mod complete.This modification is read 4601 times.top of page02-12-2000(IC-746) Separating the Tx and Rx linesAuthor: David, G4YTLSeparating the Tx and Rx lines on 2 meters in the IC746 could not be easier.Put the rig on the bench with the front panel facing towards you, and turn upside down, with the front panel still facing towardsyou.Remove the bottom cover.At back-left there is a 5 inch square metal screening plate held in place by four screws - remove it.You will see a miniature co-ax plug and cocked, labeled VRX. Simply unplug, tuck the original plug out of the way and plug in anew plug attached to a length of miniature coax, which can neatly leave the rig through the hole on the back panel that containsan earth bolt. Now you have your separate receive input!You could cut off and re-use the miniature co-ax plug, but I preferred to contact my local Icom dealer and buy a new one (acouple of dollars) - the Icom description is: PLUG TMP-P01X-A1 (Min Coax) IC-125.73David, G4YTLThis modification is read 3636 times.top of page
02-07-2001(IC-746) Power mod for the IC-746Author: NI4L - mavericktcf@bellsouth.net.MODIFICATION.NETRemove bottom cover.Find the voice module plug-in.Right behind it you will see 4 potsR993 144 mhz power adjR991 50 mhz power adjR989 HF bands power adjR990 AM power adjYou can tweak these to up the power suggest on hf doing it on 40 meters. you can get close to180 watts on 40-75 meters about125 to 150 on 20-10.The pots are very small be careful not to use something to big. the are all metal pots.NI4LThis modification is read 4921 times.top of page20-10-2001(IC-746) Solutions for chip blowing with mPCAuthor: Sergey L.Chuchanov - slch@caterpillar.ru.MODIFICATION.NETChange resistor R157 from 10 Ohm to 47 Ohm close to this chip.This modification is read 3367 times.top of page
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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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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
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Page 164 and 165: | IC31 uPD4094BG || |1 2 3 4 |5 6 7
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Page 186 and 187: Also probably would apply to IC 735
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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
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Page 208 and 209: Date: 23-02-2002 User comment From:
Page 210 and 211: less.The second way to adjust the I
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Page 218 and 219: 70% AM.My personal findings are tha
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Page 226 and 227: Add a diode on the blank position b
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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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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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