How about connecting the 259 directly to the output side of the blocking cap
(with
the PI network disconnected)? If the choke is self-resonant, I would expect the
shunt
impedance seen by the 259 to dip as it is swept thru the choke resonance. I've
been
curious to try this on my Drake L-7 to see if it might be capable of WARC
coverage
(esp 24 MHz).
Mike, W4EF.........
----- Original Message -----
From: "Phil Clements" <philk5pc@tyler.net>
To: "Bill Smith" <ko4nrbs@yahoo.com>; <amps@contesting.com>
Sent: Thursday, September 27, 2001 8:33 PM
Subject: Re: [AMPS] Plate Choke test with MFJ-259B
>
> I assume you have the plug-in "Duckie" that converts
> your 259 into a GDO.
>
> The choke is tested in place, with a shorting strap across
> the two terminals. If the choke has over 150 uh or so of L,
> there may be two resonance's found between 10 and 40 mhz.
>
> The very popular choke sold by RF Parts and used in Ameritron
> amps is resonant around 11.5 mhz, and again between 10 and 6
> meters. That is why this choke is so desirable. It has sufficient L
> for 160 meters, and is good on the other 8 bands as well.
>
> (((73)))
> Phil, K5PC
> Subject: [AMPS] Plate Choke test with MFJ-259B
>
>
> >
> > What is the "correct" way to check a Plate Choke for
> > resonance with a MFJ-259B antenna analyzer? Do you
> > leave it in the amp or take it out, etc.?
> > 73,
> > Bill
> >
> > =====
> > Bill Smith KO4NR
> >
> > --
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> >
> >
>
>
>
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