[Elecraft] KPA500 Problem

[Don Wilhelm]

Kev,

That behavior can be caused by a coax jumper, either loose or faulty in 
some way.  Make sure the PL-259s are tight and if you can substitute the 
jumpers with known good ones - particularly the one between the KPA500 
and the KAT500 and the one between your transceiver and the KPA500.
There are as many problems caused by cables as are caused by equipment.
Some cable problems have no apparent problem at lower power, but rear 
their ugly head at higher power.
You could also have a higher power problem with your antenna.  Switch to 
an alternate antenna or dummy load if possible (tune the KAT500 into the 
dummy load) as a test.

73,
Don W3FPR

On 11/13/2017 4:41 PM, Kevin der Kinderen wrote:
> Waiting on an answer from Elecraft but thought I'd also check with the
> group here.
> 
> I have a Flex 6500 with KAT500/KPA500 combo. It's been working great until
> very recently. Within the past couple of days I was intermittently reading
> high SWR when the amp is in operate. In standby or off everything looks
> good. As of last night it's not so intermittent.
> 
> In receive when I switch from standby to operate I'm only receiving the
> strongest of signals. Everything else disappears almost like the antenna
> was disconnected.
> 
> When switching between standby and operate I hear a relay clicking. I'm not
> sure but it doesn't seem to be as loud a click as I normally hear but I
> can't be sure.
> 
> With the amp powered down and the Flex set to 100 watts out everything
> seems to be working fine. I'm afraid my amp is going to take a trip. Any
> ideas for things to check?
> 
> 73,
> Kev K4VD
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