----- Original Message -----
From: 2 <2@vc.net>
To: <bearlabs@netzero.net>; AMPS <amps@contesting.com>
Sent: Saturday, January 11, 2003 1:34 PM
Subject: Re: [Amps] Re: Thunderbolt
>
>
> >2 wrote:
> >
> >> >
> >> >Around here Bill, KC2IFR (iirc) just put one on the air - AM, 75m.
> >> >
> >> >One of the things he found was that the input is a 350 ohm resistor...
> >> >which makes matching to solid state trancievers a bit dodgy... He
ended
> >> >up using a matchbox between his rig and the Johnson...
> >> >
> >> >He says he tried changing it to just a 50 ohm resistor and it did not
> >> >"work"... seems like it should have, but I wasn't there.
> >>
> >> A 200-ohm grid terminator fed through a 1 to 4 bifilar transformer
should
> >> work ok with c. 100w drive.
> >
> >Sure... should work fine... but he wanted to switch to a 50 ohm resistor
> >in the slot - he said the thing wasn't happy...
> >I'm not sure why actually
> >and didn't look for too long at the schematic.
>
> ** A 50-ohm terminator needs to see c. 200w drive in order to provide
> enough peak grid V in order to drive a 4-400 in AB1. It's no more than
> basic Ohm's-Law.
So it would seem, but he claimed to have way too much drive available as
it was... so he wanted to knock it down. That's what he said. As I
mentioned,
I wasn't there...
>
>
> >...
>
> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
> www.vcnet.com/measures.
> end
>
>
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