Hi Pete,
I had a similar set of symptoms with my K3
several years back. Turns out it was not the
K3 at all, but a failing filter capacitor in
my linear regulated power supply. I
had sporadic audio dropouts after transmitting
in much the same way as you described,
always at QRP TX levels.
Try a different power supply of newer vintage.
I tested the ESR of the filter capacitors in
my supply and found it to be much too high.
73,
Mike, K8CN
________________________________
From: RFI <rfi-bounces+mike.carter=unh.edu@contesting.com> on behalf of Pete
Smith N4ZR <pete.n4zr@gmail.com>
Sent: Tuesday, November 7, 2023 10:31 AM
To: Elecraft List <elecraft@mailman.qth.net>; RFI List <rfi@contesting.com>
Subject: [RFI] HI CUR warning on K3
CAUTION: This email originated from outside of the University System. Do not
click links or open attachments unless you recognize the sender and know the
content is safe.
I send a few characters of CW into my Carolina Windom on 40M and after a
delay (1-5 seconds after I stop sending) the K3 flashes a HI CUR
warning, and the audio gain is reduced significantly. Touch the AF gain
control and it instantly returns the gain to normal, but frequently the
HI CURR warning returns over and over, without any additional
transmissions. This sequence does not happen, even with 1500 watts,
into my dummy load, nor does it happen on the same antenna on 80M, or on
20 meters on my tribander.
I've read the HI CUR warning discussion on page 65 of the manual, but it
doesn't seem relevant, because I don't have external speakers. The fact
that it only happens when feeding an actual antenna on one band
suggests RFI, but the fact that the HI CUR warning and gain reduction
recur again and again long after any RF has me puzzled. Any suggestions
gratefully accepted!
--
73, Pete N4ZR
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