Modifications for the ICOM - RogerK

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The Icom IC W21AT handi-talkie normally receives two bands: 136 to 174 MHz and 440 to 450 MHz.You can program it to receive 50 to 300 MHz and 300 to 999 MHz.To do this, turn it off, then simultaneously hold down the # and the B keys while turning it on. Keep them pressed for 2 secondsafter turning the rig on.The LCD display will go through a self test, and you'll then have a wideband receiver. It's not very sensitive far from the hambands, but it's handy for listening to 6 Meters or as a portable scanner.Note that this modification does not require any cutting of diodes or rewiring -- it's entirely front panel.This modification is read 952 times.top of page19-07-1998(IC-W2A) IC-W2A Expand frequencyThis is less of a mod than it is a function. To expand the receiver frequency range of the new Icom IC-W2A to 118.00-170.00,322.00-513.00, and 800.000-970.000, do the following:Hold down the Light, B, and # keys while turning the power on.That's actually a four button sequence, since power on is controlled by a keypad button.This modification is read 1120 times.top of page19-07-1998(IC-W2A) IC-W2A Cross Band Repeat FunctionTo access the cross-band repeat function, first perform the extended receive mod by holding down the Light/B/# keys whileturning on the power.To enable cross-band repeat, set each band to the frequency and mode desired. Set the current band to VHF.Press (Function-2) (Function-Enter) and the little "L" indicator will flash. The radio is now in the cross-band repeat mode. Dodisable, press (Function-Enter) again.This modification is read 947 times.top of page19-07-1998(IC-W2A) IC-W2A Extended Transmit ModCall the ICOM parts department ((206) 454-8155) and order a pair of MA133 diodes (P/N 1790000850). These are the threeterminal surface mount diode packages. It is probably not advisable to substitute conventional leaded glass diodes here due tosize restraints.3¦+--------+--------+¦ ¦ ¦¦ +-->|----->|--+ ¦¦ ¦ ¦ ¦+-+-------------+-+¦ ¦1 2The modification involves removing one surface mount component and installing two others. The working parts are extremelysmall and the mod should not be performed unless you are comfortable with working while using a loop eyepiece or othermagnifying device. This is a "surgical" operation. Take all the usual precautions with respect to static electricity, etc.Remove 5 screws holding back on, and two screws on side of case below the PTT switch. Gently pry the unit apart.Inside the unit are two RF "stack" units. The complete RF "stack" is composed of two enclosed sheet metal boxes sandwiched
together, about 1.5" wide, 2" tall and .5" thick. Each RF stack unit (one per band) is totally self contained, is about .25" thick,and plugs into the "motherboard" using connectors mounted on one end.First, remove the stack units. To do this, remove one screw from each side of the stack. Remove the single screw off the bottomend of the stack and gently remove the metal spring clip holding the stack together.Carefully lift each stack unit out by pulling it back and down. They should easily unplug from the upper motherboard. Set themaside for now.At this time the back side of the front panel is clearly accessible and the two CPU's are visible side-by-side across the top. Nowrefer to the following illustration:Top of Radio, Back side of Front Panel_____________________________________________________|-------- -------- || | | | |---| CPU-1 | | CPU-2 | | || | | | | P |-------- -------- | T || T |-------- | |-------- |---. V |.. |V
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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
Page 236 and 237: 27-05-2001(IC-910) Expanded functio
Page 238 and 239: ●●●350-470 MHz RX/TX800-950 M
Page 240 and 241: This modification is read 242 times
Page 244 and 245: 1. You're completely successful.2.
Page 246 and 247: ●●●●●●●●●Für Han
Page 248: 28-03-1999(IC-Q7) Modifying the ICO
Page 252 and 253: ●●●●●●●●Desoldering
Page 254 and 255: You should now have the RF board co
Page 256 and 257: This modification is read 2358 time
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:
Page 272 and 273: This modification is read 3462 time
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]
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 306 and 307: IC-275H 10IC-375A 12IC-471 22IC-475
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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