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Icom IC-706MKII, Manual

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Icom IC-706MKII Manual Download Page 9

KB2LJJ Radio Mods Database

                    
Picture 1: frequency drift vs. temperature

Just a few steps to improve the frequency stability of your IC-706mkIIG:

1.  

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 

2.  

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

Summary of Contents for IC-706MKII

Page 1: ...nd 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 DISCLAI...

Page 2: ...able to transmit everywhere except below 5 Mhz I have not tested the power output at all frequencies yet I hope this helps everyone who have been waiting patiently for this mod Any comments can be di...

Page 3: ...diodes I think 1 and 3 Rafa SP6 1313WR Klub SP6KBE Kontakt jarel box43 gnet pl Info on the diodes from another European user d129 d111 none d112 d113 d114 d d d d 1 1 1 1 1 1 1 1 6 5 8 9 D116 and D11...

Page 4: ...M6WXO SM6JZZ TX range expansion for IC 706MKIIG Author Karel OK1DNH kebert ext epe cz TX range expansion on HF VHF and UHF is very simple When modified the radio will also transmit AM mode in the airc...

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: ...60 8 0 165 6 0 1 5 465 0 8 170 1 5 0 0 467 0 15 175 0 5 470 0 00 180 0 1 185 0 0 These are the readings I took after performing the mod I took readings at key frequencies throughout the band to measur...

Page 7: ...5 61 35 93 80 80 82 40 38 91 30 76 78 03 40 89 30 77 74 62 43 95 10 85 84 71 48 97 30 89 88 71 50 98 00 90 90 00 54 100 20 93 94 12 56 100 90 94 95 45 58 99 10 90 92 05 59 5 94 10 82 82 93 59 995 89 9...

Page 8: ...MHz plug 100 250MHz plug 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...

Page 9: ...stability of your IC 706mkIIG 1 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 2 Locate the little varicap diode right next to t...

Page 10: ...e done by simply inserting a 100Ohm resistor or two 56Ohm Watt in serie between the red fan wire and the top of the inductivity as shown in picture 4 The fan runs now very slowly all the time 5 You ma...

Page 11: ...od its quite a simple mod to do as long as you have good quality desoldering equipment if not then do not attempt it take it to someone that has the gear If you follow the text file on this page by Le...

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: ...icrofone amplification does not satisfy under certain circumstances like heavy pile up or operators with faint voice A litle modification does help to increase the amplification level a lot The 5 6 k...

Page 14: ...t necessary 8 Don t forget to set your personal mic amp level in the initial setup menue Q2 Remarks Although I modified my own IC 706 MK II without any problems I certainly will not be responsible for...

Page 15: ...KB2LJJ Radio Mods Database vy 73 Juergen DL5EBS mods IC706 MKIIG por EA1DOU ver Espa ola http www kb2ljj com data icom ic 706 MKII htm 15 di 30 23 08 2009 23 05 07...

Page 16: ...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 I have tested this and figured o...

Page 17: ...pen the top of the radio by removing the 3 top screws and 2 side screws Look at the radio from the with the front panel facing you screws 2 Gently pull up the speaker and set is aside without damaging...

Page 18: ...here s how to get the low pass filter back when tuning below 129 MHz On the bottom board right behind the MENU button there are 5 SMD transistors These transistors apparently switch the VCOs for the v...

Page 19: ...onnection at the place of the removed C153 3 The inductance of L16 L17 L18 and L19 must be reduced somewhat This can be done by separating the windings somewhat with a small screwdriver Now the sensit...

Page 20: ...0TH The following adjustments are to increase the average talk power on SSB for the above radios If your radio is still under warranty check with your supplier to ensure warranty will not be invalidat...

Page 21: ...power The article in Radcom claims that this adjustment will bring the 706Mk2 up to 100w pep without the need for the compressor For the 706MK2G early models adjusting R579 can give a dramatic increas...

Page 22: ...ges front cover open removed the D2028 diode mods is after TX ranges removed the D2028 diode front CB citizen band also and V UHF Band Mods is TX range have nice TRX mods All rig for japanese market n...

Page 23: ...r use of cw by installing a paddle in the mic 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 g...

Page 24: ...it Too much will bring in a lot of noise I ve done it to mine and it really made the ears better than from the factory As you know the receive is great on these rigs but this improves it more It takes...

Page 25: ...B2LJJ Radio Mods Database The color code is 1 Red 2 Black 3 4 Green 5 Braid 6 7 Blue 8 User comment Mic input From Guy ZL2VBV http www kb2ljj com data icom ic 706 MKII htm 25 di 30 23 08 2009 23 05 07...

Page 26: ...azoch 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...

Page 27: ...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...

Page 28: ...this resistor will keep the blower drive transistor more cooler Another benefit is the reduced frequency drift in the VHF and UHF bands SSB mode One of the resistor lead is connected to the positive o...

Page 29: ...od with 200ohm and milliamp current shouldnt need a 1 watt resistor Seems like it is overkill A 1 4 watt resistor on the removed q 571 c e pads could also serve to find the sweet speed this way the fa...

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...

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