[Amps] SPE 2K RTTY Duty Cycle

[Kevin Stover]

There are NO 12V final amateur transceivers that make -40dB IM3, none. Never have been, never will be. The best are at -33 to -35.

Those transceivers capable of 200 Watts are all usinng 28 or 50V finals and can reach -40 depending on the low pass filter used behind the PA.It's time for the manu's to get rid of this fascination with running evberything off a battery.

The most expensive part of any SS amp is NOT the finals themselves it's the LPF that will take 1500 watts and keep harmonics leagl (-43db HF, -60dB 6m). That's not IM3. Name the amp that hits an IM3 of -40. The 8877 will come close, the Russian triodes won't, none of the tetrodes will do it.


-- 
R. Kevin Stover
AC0H