I have similar problems but I was thinking it was hamlib because of the
way it triggers for me.
It happens running wsjtx on an M2 Macbook Pro and remoterig down to the
radio in my basement. There's a K3/0 in my office -> remoterig -> K3 &
KPA1500 in the basement. Almost every time I move my transmit frequency
the RX gain goes down to almost nothing. Jiggling the AF gain brings it
back to normal. It doesn't always happen immediately when changing bands
but changing TX frequency in-band triggers it right away.
On Wed, 13 Mar 2024, Pete Smith N4ZR wrote:
Operating in this morning's CWT, and saw a recurrence of strange RFI-like
symptoms. After transmitting, RX gain sometimes was severely reduced, but
simply moving the K-3's AF gain a little would cause recovery to normal.
Sometimes, this was accompanied by a HI CURR warning on the K3's display,
often occurring several seconds after switching back to receive.
My working theory has been RFI, but my station is pretty thoroughly fitted
with toroids. Still, there seems to be a correlation between running my
KPA-1500 at about 1100 watts and this set of symptoms, which I have not been
able to trigger running 100 watts To further confuse things, I just had
another episode of this occurring *several minutes* after the last
transmission.
One culprit I can think of is a 100-foot Ethernet cable between my station
and my FIOS router. I have bought a shielded replacement but have not yet
installed it. After reading some of the recent commentary about so-called
"shielded" cables, I'm wondering if this is worth doing.
Any suggestions, either K-3-specific or more general, would be much
appreciated.
**ADDENDUM** - I just tested into my dummy load with the amp operational at
1100 watts, and triggered all the same symptoms.
--
Hisashi T Fujinaka - htodd@twofifty.com
BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee
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