[Elecraft] KPA500 Problem

[Michael Walker]

Hi Kev

Don is 100% right.

I would change all the cables and then test with the amp alone and the
tuner alone to narrow it down.

I spent 3 days debugging an Acom A1000 issue only to finally out I had a
bad jumper cable.

Mike va3mw


On Mon, Nov 13, 2017 at 5:05 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:

> 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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