Hi Don,
Thanks for your help. I will do as you suggest. (Not today though_ too
many honey-dos.)
What gives me pause: how could I screw up twice the same way? I suppose
it's possible.
73,
John, W2GW
----- Original Message -----
From: "Don Wilhelm" <[EMAIL PROTECTED]>
To: "John Reiser" <[EMAIL PROTECTED]>; "J F" <[EMAIL PROTECTED]>;
"Elecraft Discussion List" <[email protected]>
Sent: Thursday, December 07, 2006 1:25 PM
Subject: RE: [Elecraft] KPA100/KAT100 on 160 Hi Current
John, Julius,
The normal thing to look at in a high current situation is the low pass
filter. Check both on the base K2 and the KPA100. First thing is to
count
the turns on the toroids - count only the turns that pass through the
center
of the core or you might end up with an extra turn.
On the 160 meter band, one extra turn is all it takes to create a high
current situation because the cutoff frequency of the LPF moves down into
the 160 meter band and shunts some of the signal to ground.
The KAP100 LPF is easy to sweep with an antenna analyzer - connect the
ribbon cable to the K2 and select the band of interest, put a 50 ohm
resistor into the input cable and attach the analyzer to the SO-239. If
you
do not find a low SWR throughout the band, the LPF is to blame.
73,
Don W3FPR
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