Frank, PA4N, wrote:
After removing the top cover
and doing some more tests at reduced power (30 to 50W), I found out
that one toroid on the KAT3 board is getting very hot. It is the blue
toroid, possibly labeled K16 (can't quite see) which has 3 windings
on it. I'm guessing this toroid is part of the circuit sensing the
reflected power.
Frank, this is the 8.215 MHz I.F. trap inductor. If it's getting hot,
it must have been mistuned so that it was resonant too close to the 40
m band. Please e-mail k3support; Gary will help you get a replacement.
Meanwhile, avoid using high power on 40 and 30 m.
The trap is adjusted at the factory, but it sounds like you may have
had an intermittent solder joint or a shifted winding by the time the
unit was installed.
73,
Wayne
N6KR
---
http://www.elecraft.com
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