That is just an Ameritron choke with a RFP model #.
It seems that even Ameritron has tolerance problems as Ive had a few of
their amps in here with contest fried chokes.
Carl
KM1H
----- Original Message -----
From: "Jim Thomson" <Jim.thom@telus.net>
To: <amps@contesting.com>
Sent: Wednesday, March 24, 2010 8:42 AM
Subject: [Amps] RF Parts plate choke
> 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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