I found the problem, I think. It was not the power supply; I checked
everything.
Here is what happened. I went into the menu on the KX3 and turned off
the amp. I tried to break the radio using CW at 10 Watts; nothing
happened. Next, I turned on the amp again and then tried to shut down
again starting at 20 Watts and every 10 Watts after that; nothing
happened. So I tried full power, 100 Watts, and still everything stayed
up, no problem.
My hypothesis is this. Over time, something became corrupted in the
software. By "resetting" the amplifier/radio connection, the software
sorted itself out. I suspect it was really a timing problem that was
created and then removed. Nothing ever happened in receive, but it
started while running in CW at 20-25 WPM. SSB wasn't a problem until a
few days ago, so it appeared to be getting worse. I was operating last
night without a problem. I, therefore, declare the problem solved.
However, if anyone with more insight into this has any information, I'd
sure like to know about it.
73,
Barry
K3NDM
On 10/7/2014 3:44 PM, Barry LaZar wrote:
John,
Thanks. I'll check that. I hope that is all it is as that is the
same 35 Amp supply that I use.
73,
Barry
K3NDM
On 10/7/2014 3:25 PM, John Nogatch wrote:
On Tue, Oct 7, 2014 at 6:40 PM, Barry LaZar <k3...@comcast.net> wrote:
... has begun to shut down unexpectedly while running CW or SSB. The
power supply is an Astron 35 Amp linear that appears to be rock
solid....
I had a similar problem with my K3. Suspecting a power supply problem,
and after reading:
http://www.repeater-builder.com/astron/astron-intro-stuff.html
I found that the RS-35M pass transistor mounting screws were slightly
loose, i.e. I could easily tighten them perhaps 1/8 turn.
After adding "split-ring" lockwashers to the pass transistor mounting
screws, the problem has not recurred.
Also, I have added fans to the backs of the heatsinks. The RS-35M no
longer gets hot, like it used to.
-John AC6SL
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