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Andy38 Profile
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Registered: 08-2010
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ic706 HF/VHF


Hello all,I am trying to wideband my 706,original 1995 model,But I keep getting diff/conflicting info,Diode D59,HAVE DONE THAT,but still no luck,can anybody help? Andy,FB065
2/Sep/2010, 9:55 pm Link to this post Send Email to Andy38   Send PM to Andy38
 
yamanx1 Profile
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Re: ic706 HF/VHF


Welcome to the forum emoticon

I'm assuming your radio is not the MK11 or MK11G.

Info below from Mods DK:

Enables out-of-band transmit for 1.6 MHz to 54 MHz. This does not enable extended VHF transmit This does not enable AM or FM broadcast band transmit.
Your memories will be cleared after this modification, since you need to reset the CPU.

Open the top of the radio by removing the 3 top screws and 2 side screws. Look at the radio with the front panel facing you.


Gently pull up the speaker and set is aside without damaging the speaker or the wires that attach it to the rig.


Note the silver rectangular box near the middle of the PCB marked something like "9 MHz SSB Filter".


Move your eyes up from this filter toward the back of the radio. Just before you get to the "D 108" marking, you will see two tiny diodes, two blank spaces, and one additional diode. They look something like this:
           D105
          --D108-- [ ]

           [XX] [XX] [ ] [ ] [XX]
           D60 D59 D58 D57 D72
Remove this diode ^^^^

 D60 USA low power 50 MHz (remove for 100 W output power)
 D59 CPU Tx limit
 D58 Eur Fra 144-146 MHz
 D57 Den Fra 50 MHz
 D72 unknown
 D105 unknown

Note: French versions have diode D84 (parallel with D59) and D85 on the underside of this print.

        D D
        8 8
        4 5

      9 1
      +----------+
      |IC10 | TD62783AF
      +----------+
      10 18

D84 CPU Tx limit
D85 Fra HF band


The second diode from the left needs to be removed. I did this by crushing it with long-nosed pliers. You can also heat it with a low-wattage soldering iron and pull it up with tweezers. Be sure not to damage the other diodes or the PCB. Be sure that you don't apply too much heat, since the heat can damage the PCB and the other diodes.


Re-assemble the radio. Reset the CPU by pressing and holding down the UP and DOWN buttons on the front panel and pressing POWER.

---

By all means think yourself big, but never think others small.... R.F.Scott
3/Sep/2010, 7:50 am Link to this post Send Email to yamanx1   Send PM to yamanx1
 
YT2095 Profile
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Re: ic706 HF/VHF


I had the exact same problem with my 706, the 1`st diode seemingly did nothing, then I removed the one next to it and still nothing, so removed one the Other side of the original and it worked.
now I have 300KHz to 60MHz constant TX without gaps and at full power.

mine is the 706 Original though (the 1`st one), so I don`t know about the mk2 or mk2G etc...?





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I`m also on Twitter as "YT2095" ;)
3/Dec/2010, 6:53 pm Link to this post Send Email to YT2095   Send PM to YT2095 Blog
 
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Re: ic706 HF/VHF


Just a note to mk2g owners,the tx conversion is very simple,you only need to remove one diode,the size of a [sign in to see URL] anyones interested i'll post a link.
7/Oct/2011, 7:49 pm Link to this post Send Email to cooterdx   Send PM to cooterdx Blog
 


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