Hi Phil,
Oh good, progress is being made!
I'll call, or email you on the trade...
I do have some IRFP260N.
You probably realize that with 5 IRFP260N in the output section, you'll be able to run about 1200 watts carrier, and modulate 150% + ?
Each mosfet/damper diode "pair" is good for 250watts carrier.
There is no need to populate that whole board, unless you need to have that much available power.
The current and voltage you see at the output of the filter, will, of course, depend on your DC supply voltage (no greater than 130vdc, if your following Steve's design with transzorbs etc..).
And the power output you intend to operate...
My output filter for the PWM was designed for a 5 ohm load, and I generally opperate my rig at 40 volts, 8 amps at carrier. (slightly under 300 watts RF output)
I use analog meters, so they basically do not change under modulation.. the current meters do wiggle a little under very heavy modulation (150% )
I'd have to say that for 100% modulation, those values are the average.
If you go above 100% (positive) modulation, it stands to reason your average voltage would be slightly higher. but you'd have to be looking at a scope to see it.
Don't know if that answers the questions or not!
Bruce