[ICOM] icom 706 MK2

[David Tremper]

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
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html