[Amps] transformer winding

[Carl]

You better have a heck of a water jacket and lots of spares if running it at 
those voltages and currents.

Carl
KM1H


----- Original Message ----- 
From: "Paul Decker" <kg7hf at comcast.net>
To: <amps at contesting.com>
Sent: Sunday, March 16, 2014 8:50 PM
Subject: [Amps] transformer winding


> Hello amplifier experts.
>
> I'm trying something new, I'm going to attempt to rewind a transformer and 
> am looking for advice.   I'm starting with a microwave oven transformer. 
> There are a couple of reasons for me doing this:
>
> 1.  show my younger generation EE's that you can re-purpose and reuse 
> things
> 2.  prove to myself I can do this and that it will "work"
> 3.  have a little fun and use things that have been sitting around 
> collecting dust.
> 4.  Get my 250W  1296 MHz amplifier running.
>
> I need to have a secondary of between 900 to 1050 to produce between 1200 
> to 1400 VDC  anywhere between 0.25 to 0.4 amps should be sufficient for 
> the 3cx100A5 it will be powering.
>
> I've cut the welds on the E-I core and removed the primary and secondary 
> windings.  In the process I've nicked the primary which I was going to 
> reuse.
>
> Those familiar with the MOT's know that most of them have the primary 
> below the secondary and there are shunts.
>
> Since I've nicked the primary, I plan on rewinding the primary but using 
> the entire surface rather than having the windings separated top and 
> bottom.  I'll then wind the secondary on top of the primary.
>
> Q1.  Does this sound appropriate to change the design from top-bottom to 
> use the full E portion?
> Q2.  What sort of paper insulation should I use between the primary and 
> secondary?  Where can I get this?  I do have some Kapton tape I could use?
> Q3.  I only nicked the first 5 windings of the primary, since I will have 
> a custom ratio, is it OK to simply remove the 5 nicked windings and adjust 
> accordingly or is removing 5 windings too much?  I can simply splice in a 
> piece of new wire.
>
> Q4. I won't be grounding the secondary to the E core like was previously 
> done so I assume I will need some insulation between secondary windings or 
> will the new secondary enameled wire be sufficient for the approx. ~ 1KV?
>
> I know the E-I core of the MOT is not the best, but I'm using it at a 
> significantly lower power level than it originally was in service for. 
> Besides, this is a learning project, the idea to use what I have on hand 
> rather than buy new "stuff"
>
> Any other thoughts, comments, or advice?
>
>
> thanks,
> Paul
> kg7hf
>
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