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Icom IC-706MKII Manual

Extended transmit mod
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ICOM 706 MKII Extended transmit mod
Special on IC706mkII
TX range expansion for IC-706MKIIG
Expand only mod for the IC-706MkII
Mike Amp Mod for IC 706 MK II
mods IC706 MKIIG por EA1DOU (ver. Española)
Modifikation IC-706MKIIG für 9k6 PR und Pactor
IC-706MKIIG mod
More talk power on SSB from your Icom 706Mk2/Mk2G and Alinco
DX70TH
Mods for Japanese version IC-706MK2G
Icom IC-706MK2 cw keyer
IC-706MK2G increase recieve
Icom 706mkIIG Mic
Convert IC-706MK2G from American to European version
ICOM 706 Mk2G IF filter change
IC-706mkIIG fan mod
ICOM LDG interface and ICOM IC-706MKIIG
ICOM 706 MKII Extended transmit mod
From: "Len SantaMaria, KC2ADV"
This file may be freely distributed as long as it remains intact, with no modifications, additions, or deletions.
DISCLAIMER:
I assume no responsibility for damage or inaccuracies contained in this document. In other words, USE THIS AT YOUR OWN
RISK. It worked for me, however I don't know if it will work for you.
WARNING #1: This mod requires the ability to remove surface mount diodes. Only those who are qualified to do this should
attempt this mod.
WARNING #2: This mod seems to erase all memory channels, etc. You may want to save this info for reprogramming.
Disassembly:
1.
Face the front of the radio towards you.
2.
Remove the three screws in a row across the middle of the top of the radio.
http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (1 di 30)23/08/2009 23.05.07
Radio Mods Database and Manuals
Modifications for the Icom IC-706MKII
 
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Summary of Contents for Icom IC-706MKII

  • Page 1 Mike Amp Mod for IC 706 MK II mods IC706 MKIIG por EA1DOU (ver. Española) Modifikation IC-706MKIIG für 9k6 PR und Pactor IC-706MKIIG mod More talk power on SSB from your Icom 706Mk2/Mk2G and Alinco DX70TH Mods for Japanese version IC-706MK2G Icom IC-706MK2 cw keyer...
  • Page 2 For first, my circuit board part number is B4916F, i don`t understand you what diodes i must cut off, explain me, my smd diodes looks like this: O<>O 7 O<>O 5 O<>O 4 O<>O 3 http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (2 di 30)23/08/2009 23.05.07...
  • Page 3 D116 and D118 are responsible for out of band TX. D115 and D119 enables RX from 30KHz to 200MHz. D113 is responsible for 6M RX and D114 is responsible for 6M TX. I do not have info about D129 and D112. Rafa3 SP6-1313WR, Klub SP6KBE :) Kontakt: jarel@box43.gnet.pl http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (3 di 30)23/08/2009 23.05.07...
  • Page 4 On MAIN BOARD under speaker near Xtal you can see two rows of solder dots for SMD components. Only on position 10 (from left) is diode (D2030), which is necessary to remove. Thats all. After connecting power radio will be reseted and TX range is expanded. http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (4 di 30)23/08/2009 23.05.07...
  • Page 5 KB2LJJ Radio Mods Database More pictures from Ken Bessler KG0WX. http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (5 di 30)23/08/2009 23.05.07...
  • Page 6 All readings were took with a bird wattmeter and a home made RF voltmeter, the latter is not reliable over 200MHz. Thanks. Olivier, VE2NSM. W from Bird V @ 50 Ohms W from RF Voltmeter Wattmeter 0,00 0,00 0,04 0,00 0,31 0,00 1,95 0,01 0.65 4,16 0,11 0.75 8,60 0,59 http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (6 di 30)23/08/2009 23.05.07...
  • Page 7 46,98 71,90 2752 48,19 65,50 22/40 39,91 54,40 15/28 27,41 39,20 7/14 14,09 22,00 1,5/4 4,31 14,30 0,75/1,8 1,76 12,10 1,23 9,80 0,79 7,40 0,43 7,30 0,41 11,30 1,07 22,60 4,56 47,00 20,37 63,20 37,13 http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (7 di 30)23/08/2009 23.05.07...
  • Page 8 200-500MHz plug Not reliable Expand only mod for the IC-706MkII It should be well know, that the IC-706mkIIG does not offer the best frequency stability. You might have already recognized this if you ever used your 706 for modes like JT65. For these modes is it very important to have a very low frequency drift.
  • Page 9 Remove the lid on the back, then remove the little lid of the XO (as shown in picture 2). Picture 2: open the lid of the XO Locate the little varicap-diode right next to the L601 (picture 3). Remove this diode. http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (9 di 30)23/08/2009 23.05.07...
  • Page 10 L601. This modification has been done on several radios. It always worked very good but I cannot give a guarantee. I am not responsible for any damages on your radio. http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (10 di 30)23/08/2009 23.05.07...
  • Page 11 Author: David Spicer,VK7ZDJ HI ALL, as an owner of a IC-706MkII, I have noticed that there is no detailed photos of how to go about the mods on any of the mod sites, so I pulled my radio out of the car and I have taken some photos of the only mod that I was interested in doing to my radio,....EXPAND RX /TX.
  • Page 12 KB2LJJ Radio Mods Database http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (12 di 30)23/08/2009 23.05.07...
  • Page 13 Mike Amp Mod for IC 706 MK II It is based on information provided by ICOM Europe. The level of the IC 706 MK II microfone amplification does not satisfy under certain circumstances like heavy pile up or operators with faint voice.
  • Page 14 Although I modified my own IC 706 MK II without any problems I certainly will not be responsible for any damage of your radio following this modification description. You are acting on your own risk. http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (14 di 30)23/08/2009 23.05.07...
  • Page 15 KB2LJJ Radio Mods Database vy 73 Juergen, DL5EBS mods IC706 MKIIG por EA1DOU (ver. Española) http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (15 di 30)23/08/2009 23.05.07...
  • Page 16 IC-706MKIIG mod Author: Tobias, DL1TWA Okay, I've got a new Icom IC-706MKIIG info for you: There is a mod saying: "Push P.AMP/ATT and RIT/SUB while power up and you will be able to see SHIFT-ADJ on your 706mkII. Dont know what this is for, recalibrating ?"...

  • Page 17: Tools Needed

    If you turn the knob a bit more to the left or to the right, then "Error" is displayed and nothing happens. I wrote to Icom Europe and they say, that this function (P.AMP/ATT + RIT/SUB) is only used in the factory during the production process of the IC-706MKIIG.
  • Page 18 Q: Does this mod affect HF or 6m? A: The mod affects only frequencies above 60 MHz. If you just cut or remove the yellow wire, the 2m bandpass filter is used all the time. http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (18 di 30)23/08/2009 23.05.07...
  • Page 19 NARROW FM is too small; therefore I did some tests and came to the following two modifications. To carry out these modifications it is necessary to use the IC706 service manual, which can be bought at any ICOM dealer.
  • Page 20 ICOM does not warranty these mods. More talk power on SSB from your Icom 706Mk2/Mk2G and Alinco DX70TH The following adjustments are to increase the average talk power on SSB for the above radios. If your radio is still under warranty,...
  • Page 21 This adjustment increases talk power considerably and for local contacts on SSB the compressor should be switched off. Icom 706Mk2/Mk2G: The Icom 706 series are notorious for low talk power on SSB. A simple tweek of the ALC can solve the problem.
  • Page 22 ~送信改造 : mods is after TX ranges. removed the D2028 diode front. CB帶~ : citizen band also and V/UHF Band Mods is TX range... have nice TRX mods!!! All rig for japanese market not open on cb channel (cpu programed for japanese market) http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (22 di 30)23/08/2009 23.05.07...
  • Page 23 Wire the contacts of a dissassembled relay with an isolated paddle (important) to the up down contacts and remove the old buttons from the small board and glue them in to the top of the mic to fill the holes enjoy colin f5vhz http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (23 di 30)23/08/2009 23.05.07...
  • Page 24 Icom 706mkIIG Mic Author: Tom This information will allow the use of an Icom HM-56A DTMF mic with an Icom 706. I have ONLY used this on my 706mkIIG so test it on all others at your own risk. You will need an 8 conductor (RJ-45) ethernet connector (male) and a crimping tool. Radio shack has a non-crimp version if you don't want to invest $45 for a new tool.
  • Page 25 KB2LJJ Radio Mods Database The color code is: 1. Red 2. Black 4. Green 5. Braid 7. Blue From: Guy ZL2VBV User comment Mic input ? http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (25 di 30)23/08/2009 23.05.07...
  • Page 26 Author: Charlie Mazoch Jr. This mod is for installing a International Radio #110 crystal filter into the Icom 706 Mk2G. Remove the upper cover of transceiver, then unplug two ribbon cables and the rf connectors so circuit board can be removed and turned over to expose trace side.
  • Page 27 The curves for the Icom 1.9 Khz and the 2.4 Khz crystal filters. The 1.9 Khz more closely resembles the International radio unit but does suffer some roll off at the pass band on one side. This is probably because these units are mass produced and as long as certain production standards are met they are sold.
  • Page 28 But, overall, this is the best mod i've seen on this subject as it don't change the regular operation of the fan in the xmit mode. Rafael Sa PY4RGS http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (28 di 30)23/08/2009 23.05.07...
  • Page 29 But again I do not know how noisy the fan is. -KB1EQC ICOM LDG interface and ICOM IC-706MKIIG Author: - Save some money and make your own interface between the LDG AUTO TUNER and the 706MKIIG or any other ICOM rig that uses the AH-4 http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (29 di 30)23/08/2009 23.05.07...
  • Page 30 KB2LJJ Radio Mods Database http://www.kb2ljj.com/data/icom/ic-706-MKII.htm (30 di 30)23/08/2009 23.05.07...