[ICOM] icom 706 MK2

[Facility 406]

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