[Elecraft] KPA500 REFL HI Message - With Dummy Load

[David Little]

Carl,

I have swapped cables, dummy load direct to Amp dummy load through tuner
(in bypass) to amp, dummy load through SWR bridge to amp.

Cables have been checked into a dummy load by SWR analyzer (realize this
doesn't' take into effect power going through them.

Have used accessory cable from K3, and hard keying through a foot switch
with the accessory disconnected.

Worse case SWR through amp to dummy load is 1.5:1 in standby at 50 MHz.  In
operate it goes back to 1.1:1.  This reads on a SWR analyzer (again, not
dynamic conditions).

I have talked to Howard at Elecraft, and I will be sending it in for a
checkout.

Thanks to all who responded.

David
KD4NUE



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Carl Clawson
Sent: Tuesday, October 16, 2012 6:22 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA500 REFL HI Message - With Dummy Load


Do I understand right that high power is the key. In other words, you can
run low power through the amp with the amp in bypass? The first thing I look
for when this happens is something arcing under high power. Check your
connectors. Once you arc a connector it will often have a carbon trace on it
that will make it keep arcing even without the stress of trying to run to a
high SWR load through a tuner.

HTH, 73, Carl WS7L

On Tue, Oct 16, 2012 at 1:47 PM, KD4NUE <dalite01 at bellsouth.net> wrote:

>
> Through tuner (Manual Palstar) to antenna, through tuner to dummy 
> load, dummy load direct to KPA500.....  Makes no difference.
>
> Amp tries to make power, SWR LEDS peg out.  REFL HI error and amp goes 
> to standby.
>
> Same thing with drive from 10 watts up.
>
> Tuner shows 1:1, rig shows 1:1.  Amp sees it as Reflected Power too 
> high.
>
> Suggestions?
>
> David
> KD4NUE
>
>
>
>
>
>
> --
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