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KPA100 Spur on 160m ?

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Mike-402

KPA100 Spur on 160m ?

During a recent 80m QSO with Ron, ZL1TW, he reported that I had some
kind of FM-ing on 80m cw.
Did some fooling-around yesterday & found the problem only existed on
80m & only on powers of 80w or more. It was VERY noticeable on a second
Rx & I was surprised nobody had mentioned it before - however, it was a
kind of revenge for Ron, as it was me who told him about the problem on
his K2 a few weeks ago.
Anyway, I installed a 12pF capacitor from the junction of D12/D14 to
ground, on the KPA-100 & all now seems clean. Not sure if the problem
had always existed with my unit, or whether it appeared 'along the
way'. This quick & easy mod DOES work though, but it would be good to
get some official Elecraft comments!
73 to all de Mike, zl1mh

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Luc Favre

Re: KPA100 Spur on 160m ?

Interesting, interesting...
I had a similar problem on 80 CW only : my note was T8 and garbling. I used
a K2/100 and a SB220-PA. I attributed this behaviour to the weakness of the
220 V supply (engine driven generator). By why only on 80 ?
More on this subject ?
Luc/F6HJO/HB9ABB

----- Original Message -----
From: "Mike" <[hidden email]>
To: <[hidden email]>; "Ron ZL1TW" <[hidden email]>;
<[hidden email]>
Sent: Thursday, December 02, 2004 6:36 PM
Subject: [Elecraft] KPA100 Spur on 160m ?

> During a recent 80m QSO with Ron, ZL1TW, he reported that I had some
> kind of FM-ing on 80m cw.
> Did some fooling-around yesterday & found the problem only existed on
> 80m & only on powers of 80w or more. It was VERY noticeable on a second
> Rx & I was surprised nobody had mentioned it before - however, it was a
> kind of revenge for Ron, as it was me who told him about the problem on
> his K2 a few weeks ago.
> Anyway, I installed a 12pF capacitor from the junction of D12/D14 to
> ground, on the KPA-100 & all now seems clean. Not sure if the problem
> had always existed with my unit, or whether it appeared 'along the
> way'. This quick & easy mod DOES work though, but it would be good to
> get some official Elecraft comments!
> 73 to all de Mike, zl1mh
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):

http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>

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