[Elecraft] KPA500: strange behaviour - any ideas?

[Gary Gregory]

I only see this rarely when I use my open wire antenna. The amp does not do
this on my standard dipole fed by coax using a choke.

I have always assumed it was RF but that is only a thought, I have not been
able to prove it as yet.

Regards
Gary

On 24 January 2013 00:21, hawley, charles j jr <c-hawley at illinois.edu>wrote:

> Mine does that too...about the same as yours. I figured it was a small
> amount of rf getting into the data cable on occasion.
>
> Chuck, KE9UW
> Lionel Trains, TCA, LCCA, LRRC
> aka Jack, BMW Motorcycles BMWMOA #224
>
> ________________________________________
> From: elecraft-bounces at mailman.qth.net [elecraft-bounces at mailman.qth.net]
> on behalf of zendoc at netspace.net.au [zendoc at netspace.net.au]
> Sent: Wednesday, January 23, 2013 6:38 AM
> To: Elecraft Group
> Subject: [Elecraft] I:  strange behaviour - any ideas?
>
> Hello Group,
>
> I'm running KPA500 #1076 with firmware 1.23 installed.  It's
> connected to my K3 via the elecraft AUX cable and is connected to my
> PC via serial to USB adapter cable using FTDI chipset.  Interfacing
> functions with the PC and K3 work flawlessly.
>
> It runs perfectly apart from one intermittent peculiarity:
> unpredictably, when in QSO, the amp will switch from operate to
> standby mode.  This does not trigger the Fault indicator and no fault
> # is ever reported by the KPA500 to the utility program or to the K3
> LCD.  It can't identify any triggers for these auto-tripping events.
> I simply return the KPA500 to operate mode and continue the QSO
> normally.  This occurs on average once per hour of operation, rarely
> more frequently.
>
> Any ideas where to look for the cause?
>
> Thanks and 73,
>
> John
> VK7JB
>
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-- 
*Gary - VK1ZZ
Motorhome Portable
The Shack*
*Elecraft K3
P3 Panadapter
KPA500FT
KAT500FT**
KX3-K
*