[Amps] RF Parts plate choke

[Jim Thomson]

Date: Wed, 24 Mar 2010 13:18:01 +0100
From: "DF3KV" <df3kv at 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