Using an attenuator pad at the input is what I was considering. Of course I
would rather use the power from the transmitting converter for something other
than generating heat. Basically I was seeing if using the 5894 in grounded
grid rather than grid driven was possible. I already have a pad on the input
of the transmitting converter (to drop the output of my FT690RII from 8 watts
to 2 watts) that I am using as the i.f. for the 222 MHz transmitting converter.
I like to use 50 MHz instead of 28 MHz as the input for my higher frequency
units if possible although I am using 28 MHz for my 432 MHz SSB.
I normally do use link coupling above 50 MHz including in the 222 MHz
transmitting converter which ends up with a 6360 mixer into a 6360 final
amplifier. I am presently getting a solid 5 watts out of the 6360 and if I
tune it carefully I can get a little bit more.
Glen, K9STH
Website: http://k9sth.com
--- On Wed, 2/11/09, Carl <km1h@jeremy.mv.com> wrote:
Why not use a pad inside of the amp at the input link or tap?
Looking at the tube specs Im not sure the 5894 screens are up to GG use. Its
pretty close to a pair of 6146's in that respect. In AB grid driven it is a
very linear tube.
Link coupling will make it easy to tune out any reactance from carbon comp
resistors. I do this with a partially HB 6M transverter with a 6360 driving a
4X150A which started out as a P&H 6-150 TX converter with a 5894.
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