Icom IC-706 (Icom IC 706 MKIIG IC706) transceiver mods reviews software and diagrams

   
 
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Icom IC-706 (Icom IC 706 IC706)
Icom IC 706
Programming interface schematics for Icom:
Programming software for Icom IC-706 (Icom IC 706 IC706) :
PDF Service Menu for Icom IC-706 (Icom IC 706 IC706) :
PDF Service Manual with schematics for Icom IC-706 (Icom IC 706I IC706) :  Icom IC-706 (Icom IC 706 IC706) Operating manual
Schematics for Icom IC-706 (Icom IC 706 IC706) :

Mods for Icom IC-706 (Icom IC 706 IC706) :
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    Icom IC-706 (Icom IC 706 IC706) e-z fix
    Icom IC-706 (Icom IC 706 IC706) NO RX Sensitivity
    Icom IC-706 (Icom IC 706 IC706) RF OUTPUT on 1 band only and low on others
    Icom IC-706 (Icom IC 706 IC706) Adding an extra RX-only port
    Icom IC-706 (Icom IC 706 IC706) Improved VHF receive mod (see also yellow wire mod)
    Icom IC-706 (Icom IC 706 IC706) To expand the band on the VHF portion
    Icom IC-706 (Icom IC 706 IC706) FM Transmit Fix
    Icom IC-706 (Icom IC 706 IC706) Microphone Audio Response Improvement
    Icom IC-706 (Icom IC 706 IC706) "Halbautomatik" fur manuelle Tuner
    Icom IC-706 (Icom IC 706 IC706) 10 watt tune modification/An Icom IC706 Tune Trigger
    Icom IC-706 (Icom IC 706 IC706) , MKII, MKIIG xmit mods - tip
    Icom IC-706 (Icom IC 706 IC706) Some tips.
    Icom IC-706 (Icom IC 706 IC706) MARS/CAP Modification
    Icom IC-706 (Icom IC 706 IC706) Review
    Icom IC-706 (Icom IC 706 IC706) Enables out-of-band transmit for 1.6 MHz to 54 MHz
    Icom IC-706 (Icom IC 706 IC706) More semsitive transmit for 2 meter
    Icom IC-706 (Icom IC 706 IC706) 60 MHz to 200 MHz bandpass filter
    Icom IC-706 (Icom IC 706 IC706) Extended RX mod
    Icom IC-706 (Icom IC 706 IC706) Info/mods
    Icom IC-706 (Icom IC 706 IC706) Expanded frequency
    Icom IC-706 (Icom IC 706 IC706) spare 0.3A

Icom IC-706 (Icom IC 706 IC706) technical specifications :  Icom IC-706 (Icom IC 706 IC706) technical specifications



Icom IC-706 (Icom IC 706 IC706) Info/mods

########################################################################
New yellow wire disconnect and reattchment to vco switch bank works!!!!!
This mod is great thanks for everyones help out there!!
########################################################################
I have an Icom IC-706 and did the mod. remove the yellow wire (4th from the edge of the plug in connector ) on the top side of the IC-706 right above the FL-30 SSB filter. The yellow wire controls either switching in the 120Mhz LP filter or the 2 meter (pseudo HP filter).

If you just disconnect the yellow wire , the sensitivity increases above the 148-200 Mhz region. I also noticed the FM broadcast sensitivity went down greatly, to over come that, the yellow wire routed from the top side back to the bottom side and attached the VCO switch points (see note below). The +5Volts logic high from the plated hole next to J8, allows the LP 120Mhz to come back when the radio is tuned below 129Mhz.
I did this mod and it works great!!!!

As far as FM Broadcast intermod in the Aircraft band, I noticed the IF is a little overdriven into compression, so I turn the preamp off(greeen to no light---preamp switch), and noticed no difference in sensitivity, intermod in aircraft band disappeared.

Running the preamp in the Aircraft 118-129 does not really help sensitivity, even though the S-meter shows higher signal levels (jumps around alot due to saturating IF when signals are not there!!! ) the noise floor actually, degrades, thus I leave the switch (no preamp-black instead of green).

Leaving it on green is just fooling yourself, driving the IF into saturation, with worst dynamic range.

I hope someone from Icom reads this, with this mod, now I can say the rig now covers the 30Khz - 200Mhz, rather than the modified statement 30Khz - 120 Mhz.

Now , I am very happy with the receive performance, leaving the yellow wire, and not connecting it to the VCO switch bank logic high point near J8, allowed me to hear 2 meter repeaters in the 82-83Mhz range, and poor FM broadcast reception.

Now connecting it to the VCO switch bank, the radio performs to my satifaction, hearin weather at 162, forestry at 171, TV audio near 200Mhz and remembering to turn preamp off in 118-129 aircraft region, no 2 meter images/mixes any more in 82-83Mhz area from 2 meters. Can comfortable listen now to FM broadcast in the 88-108Mhz area. I now have no real complaints about the the IC-706.

Having fun with mine, traded in my Kenwood TS-50, and no compaints, don't even miss the TS-50. THe IC-706 is a real great rig.! Have fun with your 706's .

ICOM, I HOPE YOU SEE THIS, I THINK THIS MOD IS VIABLE AND SHOULD BE INCORPORATED FOR NEWER ICOM IC-706's!!!

(Cecil A. Moore~) writes:
> In article 1995Nov8.090310.1@ntc01.tele.nokia.fi,
>  harjula@ntc01.tele.nokia.fi wrote:
>
>>The fourth yellow wire seems to control
>>a lowpass/highpass 120 MHz filter. In the standard configuration the
>>highpass filter is used only on 144-148 MHz, every other frequency uses
>>the lowpass. Anyway, if you want to listen to frequencies above 120 MHz
>>this mod is very useful. It does even remove most of the FM band
>>intermodulation. I just don't understand why Icom has not put the switching
>>limit on 120 MHz instead of 144/148.
>
> Does this mod affect HF or 6m? After the mod, what frequencies use the LP
> and what frequencies use the HP filter?

The mod affects only frequencies above 60 MHz. If you just cut or remove the yellow wire, the HP or actually 2m bandpass filter is used all the time.

Last night I took the loose yellow wire and connected it to a VCO control switch transistor (?) on the lower PC board. Now I have the LP filter in use between 60 and 129 MHz and the 2m bandpass between 129 and 200 MHz.

There are five SMD transistors on the lower PC board just behind the "MENU" button. The one in the middle controls the VCO that is in use from 60 to 129 MHz. The single pin has 5V when within this range.

The mod affects only frequencies above 60 MHz. If you just cut or remove the yellow wire, the HP or actually 2m bandpass filter is used all the time.

Last night I took the loose yellow wire and connected it to a VCO control switch transistor (?) on the lower PC board. Now I have the LP filter in use between 60 and 129 MHz and the 2m bandpass between 129 and 200 MHz.

There are five SMD transistors on the lower PC board just behind the "MENU" button. The one in the middle controls the VCO that is in use from 60 to 129 MHz. The single pin has 5V when within this range.
There is a trace from this pin to a plated-through hole near J8.
This is a good place to connect the wire. (I haven't even seen the schematic so cannot say if this is the best way to do it.
But it works for me.)

129 MHz seems to be quite close to the cross-over point of the LP and 2m BP filters. Here is a listing of the (NBFM) signal strength needed to "light" the first segment on the S-meter on each frequency:
MHz     uV/LP     uV/BP
125     .8        2
135     12        .5
145               .15
155     30        .5
165               3
175               11
185               140
After the mod I can listen to the Helsinki airport on 134 MHz but the Meteo on 128.4 is still drowned in intermod from the FM BC band.
Neither am I. Proceed at your own risk etc. And have more fun with the 706!


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    Icom IC-756 PRO (IC 756 PRO IC756PRO) service manual and specs
    Icom IC-756 PRO II (IC 756 PRO II IC756PROII) service manual and specs
    Icom IC-756PROIII (IC 756 PRO III IC756PROIII) service manual and specs
    Icom IC-760 (IC 760 IC760) service manual and specs
    Icom IC-761 (IC 761 IC761) service manual and specs
    Icom IC-765 (IC 765 IC765) service manual and specs
    Icom IC-775 (IC 775 IC775) service manual and specs
    Icom IC-775DSP (IC 775 DSP IC775DSP) service manual and specs
    Icom IC-780 (IC 780 IC780) service manual and specs
    Icom IC-781 (IC 781 IC781) service manual and specs
    Icom IC-7000 (IC 7000 IC7000) service manual and specs
    Icom IC-7400 (IC 7400 IC7400) service manual and specs
    Icom IC-7800 (IC 7800 IC7800) service manual and specs
    Icom X3 (X 3) service manual and specs
    Icom IC-7700 (IC 7700 IC7700) service manual and specs
    Icom IC-7100 (IC 7100 IC7100) service manual and specs
    Icom IC-7200 (IC 7200 IC7200) service manual and specs
    Icom IC-7410 (IC 7410 IC7410) service manual and specs
    Icom IC-7600 (IC 7600 IC7600) service manual and specs
    Icom IC-9100 (IC 9100 IC9100) service manual and specs
    Icom IC-78 (IC 78 IC78) service manual and specs

Icom receiver/scanner:
    Icom IC-R1500 (IC R 1500 ICR1500) service manual and specs
    Icom IC-PCR1500 (IC PCR 1500 ICPCR1500) service manual and specs
    Icom IC-R2500 (IC R 2500 ICR2500) service manual and specs
    Icom IC-PCR2500 (IC PCR 2500 ICPCR2500) service manual and specs
    Icom IC-R9500 (IC R 9500 ICR9500) service manual and specs

CB Equipment


President
Midland
Uniden
Zodiac

 Power amplifiers


Beko
Icom
Alinco
Drake
Yaesu
Daiwa
Collins
Kenwood
DanAmps
Ameritron
Autophon
Eto/Alpha
Command Technologies
E.F.Johnson
Dentron Radio Co.

FRS/GMRS


Bell
GPX
ENC
Tekk
Icom
Sony
Alinco
Drake
Cobra
Maxon
Vertex
Conair
Uniden
Jenson
Ranger
Midland
Whistler
Magnum
Unwired
Coleman
Motorola
Audiovox
Memorex
Columbia
Samsung
Standard
Kenwood
Cherokee
Panasonic
Freetalker
Vtech Vtalk
RadioShack
Fanon Courier
Sharper Image
General Electric
Oregon Scientific

PMR446


Sommerkamp
FreeQuency
Goodmans
Kenwood
Lafayette
President
Binatone
Motorola
Multicom
Albrecht
Maycom
Topcom
Xtreme
Ondico
Telcom
Maxon
Vertex
Zodiac
Yaesu
Cobra
Alinco
Icom
Alan
ITT