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) to codan 9350 auto antenna tuner interface
    Icom IC-706 (Icom IC 706 IC706) all version, modulation tweaks at ease
    Icom IC-706 (Icom IC 706 IC706) Mk1- Deaf on 144Mhz
    Icom IC-706 (Icom IC 706 IC706) Increased mic gain
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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) 60 MHz to 200 MHz bandpass filter

Ok, here's the computer simulation info I promised. I modeled the 60 MHz to 200 MHz bandpass response. To say the least, it sucked rocks. There are two poles, one at about 136 MHz and the other at about 160.5 MHz. Response is nice and flat from 60 MHz to 120 MHz with less than 4 db of ripple, but it takes a dive from there. In the 130 MHz to 170 MHz range, the loss is at least 36 db, rising back to only 30 db at 200 MHz. Image rejection at 280 MHz is only 26 db.

Now the ideal fix is to change the inductors so that L49 is 27nH, L40 is 22 nH, and change C152 to 30pF. That gives a lovely passband across 60 MHz to 200 MHz, and gives strong image rejection at 280 MHz and up, with one of the nulls falling right on that frequency. The factory ought to do that.

Unfortunately, examination shows these coils aren't easy to modify. So there's another way that still gives a pretty good response. If you remove C53 and C153, you'll get full response, though with a dip of 4 db in the 160 MHz to 180 MHz range, and only 26 db of image rejection at 280 MHz. But if you increase the value of C152 to 32pF by tacking the removed C153 across it, response flattens and tightens in the upper VHF range, and image rejection improves to 31 db at 280 MHz. That's about as good as we're going to get without replacing L49 and L40 and C152 with the recomended values.

Here's the ARRL Radio Designer file for the filter.

**************************************************
*ARRL Radio Designer v1.0
*IC-706 60 MHz to 200 MHz bandpass filter
* Gary Coffman KE4ZV 1/18/96
**************************************************

Blk
**Component data inductors

L22:1.2uH       
L49:82nH        ;ideal 27nH
L40:68nH        ;ideal 22nH
L25:0.15uH
L26:0.18uH
L27:1.2uH

**Component data capacitors

C51:.001uF
C154:20pF
C153:0pF        ;was 12pF       
C152:32pF       ;was 20pF
C53:0pF         ;was 20pF
C151:24pF
C52:18pF        
C54:220pF
C55:22pF
C56:82pF
C57:27pF

**Node list

IND 1 0 L=L22
CAP 1 2 C=C51
CAP 2 0 C=C154
IND 2 3 L=L49
CAP 2 3 C=C153
CAP 3 0 C=C152
IND 3 4 L=L40
CAP 3 4 C=C53
CAP 4 0 C=C52
CAP 4 5 C=C151
CAP 5 6 C=C54
IND 6 0 L=L25
CAP 5 7 C=C55
CAP 7 8 C=C56
IND 8 0 L=L26
CAP 7 9 C=C57
IND 9 0 L=L27
BPF:2POR 1 9

END

**Frequency block

FREQ
ESTP 50MHz 300MHz 511
END
**********************


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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