[AMRadio] Stancor Modulation Transformer Wiring?

[Steve WA1QIX]

Hi !

I'm modifying a Ranger transmitter, and am replacing the existing 
modulation transformer with a Stancor A3893.  This, along with a 
direct-coupled audio driver, running the modulator (using 6DQ5s) in AB2 
(with plenty of negative feedback) should result in an excellent sounding 
driver for my friend's linear amplifier.

I am not sure of the wiring of the A3893, and can't seem to locate a wiring 
diagram.  I've traced it out, feeding low voltage into one side and 
measuring the output on the other.  The turns ratio, full primary to full 
secondary is about 1.176:1 .  This will work very well, and the modulator 
should be able to deliver enough audio to modulate the carrier around 180% 
positive.  There will be a 3-diode negative peak limiter as part of the 
modulator.

Does any one have a diagram for these Stancor transformers, or at least 
know which is the "primary" and which is the "secondary"?  As long as 
either side can withstand unbalanced DC, it really doesn't matter which is 
which, but it would be nice to know the "proper" wiring.

Thanks and Regards,

Steve

At 09:04 PM 1/26/2012 -0500, you wrote:
>Not expensive if you have something like trees already, otherwise it might 
>not be exactly cheap!!! Raising my inverted vee to a flat top would 
>require quite a bit of expense!!
>
>----- Original Message -----
>From: Rob Atkinson
>Sent: 01/26/12 04:14 PM
>To: Discussion of AM Radio in the Amateur Service
>Subject: Re: [AMRadio] AM Radio
>
>  Hi John, Is it possible to raise the ends of the V to make a flat top? 
> Not expensive and a nice improvement. Inv. Vs never seem to do as well as 
> flat tops, unless the ends of the V are pretty high up, 40 feet or so. 73 
> Rob K5UJ
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