Ballast transformer secondary as a reactor for an unregulated power supply

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ka1tdq:
Yeah, that’s not going to work in a voltage doubler. I’d need something purely resistive in this case.

I’ll just do a resistor in the primary and then short it after a few seconds. It’s not thrilling, but it works.

Jon

WBear2GCR:
Ur running an 800w PS.
You'll want a fairly hefty relay, and fairly hefty power resistor in series.
Something around 10ohms +/- will do the trick. About 50watts - the less time you have it in series the lower
the wattage needed.
The Chinese on epay sell these little adjustable timer modules with a relay for a buck... :D

What's it gonna run?

                             _-_-

ka1tdq:
I hate to say it, but I’ve changed my mind on what to build. I had planned on building a PWM for a class E rig, but instead I’m building another E transmitter. I already have the Heising modulator for it completed.

This transmitter will be 100 watts carrier for 40 meters using two FETs in parallel. It’s just like my current 40 meter, single FET rig except I’m just adding another FET.

My coworker is painting the cabinet for me. I picked it up at the last hamfest, and it is absolutely the perfect chassis for the project.

Jon

WBear2GCR:
So, a class H modulator then?? Or?

ka1tdq:
Modified Heising with an external solid state audio amp.

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