[Amps] Need help understanding an old Transformer

[jeremy-ca]

----- Original Message ----- 
From: "Rick Stealey" <rstealey at hotmail.com>
To: <amps at 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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