Hello Andy,
Replies should just go to the list, I am not very good with GMAIL, I
had to set up an account to use the Blacksheep group as it was
spitting out my old e-mail address i use for everything else, let's
see if this just goes to the list...
Thanks for the tips, understood and appreciated.
Tuesday, April 11, 2017, 1:01:41 PM, you wrote:
> If your PAs are the push pull type using a transformer, you'll have
> to keep those, and take their secondary winding to the combiner.
> Not ideal but not a lot you can do if you use that sort of design
> rather than a bridge or half-bridge
> I don't use toroids for LF transformers - never have, never would.
> I use SMPSU cores - you know where you are with them and are safe in
> the assumption they are exactly as advertised . Its a long time
> since I bought any, but the last ones I used were 3C90 material
> IIRC, but there's better stuff out there now.
> I might use iron dust toroids as inductive elements for filters and
> DC chokes, but gapped ferrites work as well, and rather more precise in their
> calculations
> As for determining core size and number of turns Just use the
> equation V >= 4.44 .F.N.A.B (all in Si units) , keeping B below
> around 0.1 or even below 0.07 Tesla and you're there. Look at
> SMPSUs to get a feel for the size of core for a given power.
> If your individual modules are designed for 50 ohm load, then your
> secondary on the combiner needs to deliver the summed power to 50
> ohms. I only ever saw the idea used on the Deccas with their own
> individual tanks. You'll just have to try it and see
> Just noticed you sent this message off-list ?
> Andy
--
Best regards,
Chris mailto:[email protected]
|
