[ICOM] icom 706 MK2

[Mark Spencer]

 Back when I used to routinely use ICOM 706Mk2G's in VHF and up contesting I spent some time and money custom making power cords (with short power cables) for them.   That did seem to help matters, but the experiences of others may differ from mine.    Good luck.
73Mark SVE7AFZ
    On Thursday, April 11, 2024 at 12:46:38 p.m. PDT, David Tremper <kl7zkalaska at gmail.com> wrote:  
 
 If you're using a power supply that has a variable control for voltage or
current, then we might have a dirty pot.  Turn the power supply off and run
the controls up and down about 10 times and see if that fixes it.

On Thu, Apr 11, 2024 at 11:43 AM Facility 406 <
facility_406 at bruteforcedevelopment.com> wrote:

> On 4/11/2024 11:55, kl7zkalaska at gmail.com wrote:
> > Heck, I don't even know where to find the original post about the issue
> or I
> > would have asked the question directly.
>
> OM has a 706 series radio, which uses a known likely to be bad power
> cord which causes cutouts at certain current draws, which can be
> variable, due to electrical, and mechanical conditions.  In his case, he
> turns up the power, and the radio cuts out, which is the #1 indicator of
> the cord issue:
>
> "hello to the group need some opinions i have the above radio that’s
> been giving me some issue. recently when im on HF and the power setting
> is on 7 the radio cuts out, does not cut out when i’m on power setting
> lower than 7"
>
> There could be other issues beyond this, but #1, even new out of box,
> first try, perfect installation, is likely to be the cord.
>
> Alternately, the cord may be fine for a while, but more use and movement
> makes a seemingly random failure more likely to appear, and one
> generally doesn't take into consideration a 1mm shifting of the cord, or
> even the temperature of the room increasing over a week or two, when the
> radio or power supply was fine yesterday.
>
> Icom developed the Schrödinger's Cat of cords with this one...
>
> Adrian further suggested:
>
> "Above is initially why the PA tap supply (covers off) internally should
> be checked for volt drop under load. If so, then we know it is a volt
> drop problem, rather than rfi or other."
>
> That'd be a fair step-two, after wiggling the cord with the radio on.
>
> RFI could be another issue.  I wouldn't think so, unless there were some
> unknown to the user station changes in the middle of:
>
> "recently when im on HF and the power setting is on 7 the radio cuts
> out, does not cut out when i’m on power setting lower than 7"
>
> But always a possibility.  I'd say it's likely the OM didn't completely
> re-work his entire station layout, then notice a problem then wonder
> what happened, but that's an assumption.
>
> Finding a sudden issue in the midst of multiple varying variable
> variables, is always a chore.
>
> Kurt
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To support QSL/QTH.net: http://www.qsl.net/donate.html