It sounds like one of the output devices have failed. Half power out
is usually the indicator. A number here have reported this happening.
It would be nice to know why this problem is occurring and if
Elecraft are working on a fix.
- Paul
At 07:10 AM 2/16/2019, rocke...@gmail.com wrote:
I talked to Peter on the phone. He has no bias current when amp is
transmitting with no power applied (key on SSB without talking. He
is reading 54 volts and has tried power cycling amp from power
supply switch and reseated all cables. Definitely BAD distortion on
SSB (we are close enough to hear each other). Looks like one RF
device let loose and it is dragging down the bias voltage. That is my guess.
Dave wo2x
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
<elecraft-boun...@mailman.qth.net> On Behalf Of Wes
Sent: Saturday, February 16, 2019 9:49 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 failed!
I think a two-tone test is the best evaluation tool.. The generator
is built into the K3 if you have another receiver that you can use
to listen to the amp output. I use an SDR-IQ which is a very nice
tool for this but any other SDR would do.
Sorry for your pain.
Wes N7WS
On 2/16/2019 7:28 AM, li...@w2irt.net wrote:
> I was operating in the ARRL-CW contest this morning and on 20m, with a
> 1.2:1 SWR on the Yagi, all of a sudden I saw my power drop to about
> 450-500W with about 40W in. Worked a few stations but not as easily as
> when I turned everything on this morning. Switched over to phone
and made a few contacts.
> Audio is fine barefoot with 100W out of the K3s-which suffered blown
> finals itself during CQWW SSB last fall, but with the amp in I got
> reports that my audio was badly distorted.
>
> Before I send it in, is there anything I should look at or any
> diagnostics I can easily perform? For the cost of this, I'd have
> thought protection would have kicked in to prevent anything untoward
> from happening. I'm in complete disbelief, to be honest.
>
> ---------------------------------------------
> 73 and Good DX
> Peter, W2IRT
>
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