FWIW: I used to use the RRC1258 to access a remote station, and I had
this issue at times. The AF gain would go very low, any small movement
of the AF Gain control would restore it instantly. It's old info, I
don't use the 1258 anymore, but it was real for me when I did.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Hisashi T Fujinaka wrote on 3/14/2024 2:01 PM:
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.
--
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