[Elecraft] KPA-1500 input too high

[rocketnj at gmail.com]

The input too high only happens into a non-resonant load (tuner in circuit).
Also noticed on 20 now when tuner is in operate there is a 3 dB drop in
noise floor.

This is the second time the 3 watt resistor has desoldered itself from the
board and both times the resistor is discolored.

Only one RF path from radios through switching into amp input. Amp output
feeds a 1x4 antenna switch. No other radios transmitting in near proximity.

Definitely something failed on filter board.

Dave wo2x


-----Original Message-----
From: Paul Baldock <paul at paulbaldock.com> 
Sent: Saturday, April 27, 2019 6:21 PM
To: rocketnj at gmail.com; elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 input too high

Try it in to a dummy load.

- Paul

At 02:48 PM 4/27/2019, rocketnj at gmail.com wrote:
>Hi All,
>
>
>
>KPA-1500 s/n 423
>
>
>
>Operating 80 meter SSB running 20 watts drive with tuner engaged for 
>about
>1240 watts out PEP. Remote app shows maximum power handling of 1620 watts.
>
>Out of nowhere I got an input power too high alarm @ 191 watts! The 
>radio is capable of 100 watts out max and verified is set to 20 watts.
>
>
>
>Set tune power to 10 watts.
>
>Meter in amp during standby reads 10 watts.
>
>Switch to operate and immediately get input power too high alarm @ 91
watts.
>
>
>
>Switch to 20 meters (resonant antenna). No issue - 10 watts tune is 
>approximately 400 watts out with no error.
>
>
>
>Any ideas?
>
>
>
>Dave wo2x
>
>
>
>
>
>
>
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