[Elecraft] KPA100/KAT100 on 160 Hi Current

[John Reiser]

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" <w3fpr at earthlink.net>
To: "John Reiser" <reiserj at optonline.net>; "J F" <phriendly1 at yahoo.com>; 
"Elecraft Discussion List" <elecraft at mailman.qth.net>
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
>