[ARC5] Army/Navy transmitters from a NON COLLECTOR viewpoint, the ham version...

[Kenneth G. Gordon]

On 10 Feb 2020 at 23:57, Dennis Monticelli wrote:

> 
> The full wave voltage doubler commonly used in transmitter power supplies since the 70's is a 
> good design.  It utilizes the core well, does not impose DC on the mains or transformer, and 
> inherently allows use of capacitor stacking.  I believe this is one to which Ken is referring.

Yes. That is exactly the one.

> It's only real disadvantage is that the flying secondary is not ground referred.  

Yes, exactly. I can live with that, though.

I use this circuit for my small receiver power supplies, built using two back-to-back 12 or 24 
volt transformers. The 120 secondary of the second transformer feeds the full-wave 
voltage-doubler circuit. Those transformers are insulated for 600 V, BTW. Output voltage 
under load is around 243 VDC, as I remember it.

> It is true that oversized lytics increase I squared R losses, which is not a kind thing to do to a tired 
> old transformer used to small lytics and/or choke-input filters. When the full wave doubler was 
> applied to factory-built transmitters the vendor used transformers with a lower winding resistance 
> than the plate transformers of old, thus minimizing the issue.
> 
> Hopefully, this low res image came through.

Yes it did, Dennis, and thank you.

Ken W7EKB