[Elecraft] re: K3 #1851 is (mostly) alive!

[wayne burdick]

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


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