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.
--
73, Pete N4ZR
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