Modifications for the ICOM - RogerK

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19-07-1998(IC-490) IC-490A 10MHz up modificationPLL,VCO Adjustment:Remove top and bottom covers.Remove PLL unit cover.Remove four screws on PLL DRIVER board.Take X1 (15.8145MHz) out inthe PLL unit and replace with the 16.321MHz crystal.Connect RF voltmeter to R36 in the PLL unit.Adjust L5,L6, L7 coils for maximum level,(Note: Turn L2 counterclockwise about twoturns if there is no signal.).Connect voltmeter to D1.Adjust L2 for 4 volts.Remove connector J4 on the RF, YGR unit.Connect RFvoltmeter to the cable from the PLL unit.Adjust C62,C63,C73,L13 caps and coil for maximum level.Set the display for 444,9985MHz.Connect frequency counter to C54.Adjust R6 in the PLL unit for 202,8100MHz.B.P.F.Adjustment:Connect power meter to the antenna connector.Set the mode switch to FM.Transmit and adjust L19,L20,L21,L22,C67,C74 formaximum output power.Apply RF signal to the antenna connector (RF signal Generator).Adjust L8,L9,L10,and L11 coils formaximum receive sensitivity from 440MHz to 450MHz.Receiver Adjustment:Apply 445MHz signal to the antenna connector (RF signal Generator).Adjust L11 and C18 for maximum sensitivity at445.000MHZ.Transmit Adjustment: Connect power meter to the antenna connector.Add a jumper between R218 and R219.Set mode switch toFM.Put display on 445.000MHz.Tranmit.Adjust C74 for maximum power output at 445.000MHz.Remove the jumper.Adjust R154for 10 watts.Adjust R153 for 1.0 watts.This modification is read 545 times.top of page31-03-1999(IC-490) Anschluss eines G3RUH Modems und AFSK-Modem an IC-490Ede DL2LK @ DB0EAMDas IC490E ist sehr leicht gleichzeitig fuer AFSK und FSK anzuschliessen.Empfangs-NF direkt am IC12 Pin 9 abnehmen. (MAINUNIT)Masse wenn gewuenscht direkt am nebenliegenden Bandfiltergehaeuse L19 verloeten.--Dieses Signal ist gleich gut fuer FSK und AFSK zu verwenden.-FSK-TX Signal an R32 (Widerstand stehend) direkt oben anloeten. (MAINUNIT)Masse wenn gewuenscht an R33 (Widerstand stehend) direkt oben anloeten.AFSK-TX Signal an R11 (Widerstand stehend) direkt oben anloeten. (MAINUNIT)Masse wenn gewuenscht an R8 (Widerstand stehend) direkt oben anloeten.Achtung vor den loeten an den Widerstaenden natuerlich die Schutzfarbe etwas abkratzen.Hinten am Geraet ist die ACC Buchse mit 9 Pins. Hier kann man alle Signale sehr leicht draufloeten. Pins 5 und 6 sind nichtbeschaltet. Ich habe den PIN 7 (8VDC 20mA) freigemacht, da ich dieses nicht benoetige und die Buchse ist jetzt fuer PACKETfolgendermassen beschaltet.PINBezeichnung--- ---------1 wie bisher2 wie bisher PTT3 wie bisher 12 Volt/300mA fuer TNC2C/G3RUH4 wie bisher Masse5 neu NF-RX vom Diskriminator6 neu TX-FSK zur Varactordiode7 neu TX-AFSK8 wie bisher9 wie bisherAlso mit einen einzigen Kabel wird der TNC mit eingebauten Modem und das G3RUH Modem mit Daten und der benoetigtenSpannung versorgt.Es ist wichtig bei DIGIPEATERN die gleichzeitig FSK und AFSK machen die beiden DCD's auszuwerten und verknuepft dem TNCzur Verfuegung zu stellen.
Dieses ist mit dieser Schaltung also sehr leicht zu realisieren.Die Umschaltzeiten mit diesem Geraet sind natuerlich sehr kurz. Das bei AFSK eine digitale DCD Erkennung vorhanden seinmuss, versteht sich von selbst.Viel Spass bei normalen Packet und "High-Speed-PR" auf 70 cm.73 de Wilfried DL2LK @ DB0EAMThis modification is read 523 times.top of page19-07-1998(IC-4SAT) ICOM IC-4SAT extended transmit modOk, I recently asked the net for mods to expand the transmit frequency coverage of the Icom IC-4SAT so that I could access therest (or at least more ) of the 440 ham band below 440mhz.Well, the net didn't come through but a local ham made a suggestion to me that I followed up on. I mentioned that I had a mod(see attached message below) for the IC2SAT to expand its transmit range. He suggested that I look at doing the same mod (Iknow - it sounds crazy). Since I have the tech manual for both units oked at the 2S manual to see what the mod was doing. Ithen looked at the 4S manual to see if things were similiar. To my suprise (although in retrospect I'm not suprised, just suprisedthat I didn't think of it) the microprocessor section is IDENTICAL wi th only the initialization matrix of diodes being differentbetween the 2S and the 4S. Even the part numbers of the micro were the same (led me to believe that the code is the same inboth). So I tried the mod explained below.Bottom line - it worked!! I get about 30 mhz of lock range from about 435 MHz to 465 MHz. My next step will be to look atretuning the vco to move it down in the ham band more./s/ Bob Gettys N1BRMThis modification is read 341 times.top of page23-01-1999(IC-4SE) Extending the Rx. coverage of the IC-2SE and IC-4SEIt is possible to extend the receiver coverage of both of the above radios without removing the covers!With the radio turned off, but beep enabled, hold down LAMP, FUNC and V/M buttons while simultaneously turning on the radio.Keep all 3 buttons pressed. The display will fill up with all sections on, then there will be a beep, a longish gap and another beep.Once the second beep is over, release the buttons.Lo and behold, you now have coverage of any freq from 0 to 1300 MHz, except, of course, that the VCO cannot cover the entirerange. For example, the 4SE will cover approximately 380 to 480Mhz plus 805 to about 930MHz.Information originated from G8SEZThis modification is read 286 times.top of page19-07-1998(IC-551) Modification af the ScanRate and ScanSpeed for IC551DIntroduction:Here is a modification for the IC-551D 6-metre multimode radio. The mod. may be applicable to other ICOM radios of that era,eg, the 2-metre version (IC-251?, IC-211?). It is easily carried out and consists of soldering a jumper wire between two otherwires. No major disassembly is required.Background:When the 'VFO' switch is set to the 'MS' position, the IC-551D can be made to scan three user-programmable frequencies. Unfortunately,after scanning has stopped on an active frequency, it never re-starts, even if the signal disappears from the frequency.The radio remains on that frequency indefinitely. The user is forced to manually re-start the scanning, and the cycle repeatswhen an active frequency again opens the squelch.Modification:This mod. will cause the scanning to pause on an active frequency for approx 10 seconds; scanning automatically resumes at the
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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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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
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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 and 120: e shorted to ground and cause PLL u
Page 121 and 122: 19-07-1998(IC-451) IC-451 aus 9600F
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
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Page 137 and 138: X . X . 5.0 KHz 1 0 1 0. . . . X .
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
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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
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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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