Date: Wed, 24 Mar 2010 13:18:01 +0100
From: "DF3KV" <df3kv@t-online.de>
Subject: Re: [Amps] placement of RF choke bypass cap.
I tried that choke in one of my amplifiers without testing it first with the
GDO and it just turned into smoke on 10m.
73
Peter
## It resonates on 27.6 mhz......... which is too close to 10m.
Nobody has been able to successfully duplicate it either.
All attempts at an exact copy, same wire ga, etc.. have
resulted in blow ups on 10m.. and also 20m. You can get the
same magnet wire ga, from 4 x diff vendor's.. and all 4 x will
have a slightly diff OD..depending on thickness of goop. That
will change the resonance points, cause of diff stray C between
turns.
## Most of the time, the RF parts choke works very good...with
minor shifting of it's THREE series resonance freqs. They will
move about, as the choke is moved about the chassis, it has to be
clear from nearby side walls, other metal, etc. Alpha
came up with their own version of a gapped choke. Dunno if the
Alpha plate choke can be purchased or not.
Jim VE7RF
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