Thanks Rick,
Well I think the 4CX5000 will do 11 KW max so that puts your numbers 8/11 max or about 75% of max to stay clean. I suppose a good high plate supply with enough screen voltage to provide enough gain.
I'm actually playing with an old Viking 2 CDC modulator that uses 807s. Crazy flash back to youth. Rig is so I can get on AM from summer home. Small lot near the beach not really suited for QRO.....at least during waking hours. gfz
R L Measures wrote:
On Jan 5, 2007,
at 6:22 PM, FRANCIS CARCIA wrote:
>
> So Rick,
> Do I assume you never want to drive the grid 1 positive
Correct. AB1 means the grid is never driven into positive region.
Sure, it sounds strange to say the maximum grid potential is 0 volts,
but it's true.
> or let the plate voltage swing below the screen for cleanest output?
For a pentode, the minimum anode potential can swing slightly below
the screen potential with no problem, but with a tetrode, the screen
current - as well as total IMD - goes through the roof when the anode
potential dips below the screen V. Thus for AB1 SSB, use an
abundance of anode V. plus the max screen V.
> Any feel for the output power limit for say a 4CX3000A holding that
> operating condition? gfz
Plywood Box #2 would do c. 8kpep out in AB1 / SSB with 1kV on the
screen.
> ...
R. L. Measures, AG6K, 805.386.3734
r@...,
rlm@..., www.somis.org
