----- Original Message -----
From: "Rick Stealey" <rstealey@hotmail.com>
To: <amps@contesting.com>
Sent: Monday, May 26, 2008 12:34 PM
Subject: Re: [Amps] Need help understanding an old Transformer
>
> 3440/3440 3000 500
> 115-230 1690
>
>
I THINK you are going to use a full wave rectifier (2 strings of modern
diodes), into a choke, and
get 3000 volts out, at 500 ma = 1500 watts. Perfect, right at the legal
limit. (Ignoring bleeder load.)
What legal limit? That would be 1500W input power. Granted the secondary
rating could probably squeeze 700-800 ma in ICAS use but the peak regulation
would suffer if the winding resistance is high.
It would be a nice transformer for an AM rig or big modulator using it as
designed with a choke input.
A modern xfmr with equivalent CW/SSB capability weighs around 25#.
Measure the secondary resistance. If more than about 20-30 Ohms it would
self destruct if used in a straight FW or a FW bridge with a fat capacitor
as the only filter.
OTOH, it might make an adequate modulation transformer.
I have a brute oldie xfmr here. The secondary taps are 7000 and 8000V CT at
1.5A CCS. Just what I need for a pair of 450TL's or 304TL's as modulators.
Guaranteed hernia iron!
Carl
KM1H
And the primary is going to suck 1690 watts from the line, resulting in a
190 watt loss in the core.
Of course I could be wrong, but I get some extra credit for being first to
turn in my quiz don't I?
Rick K2XT
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