Could that be because the Navy used E55F (presumably = EF55). The
active antenna whose description started this thread does use three of
these devices.
Amongst the mine of nostalgia out there, I there anyone who understands
valve circuit topology and can tell us if the circuit I described really
can be considered as a cascode but using just a single pentode.
The dual gate mosfet can be considered to operate in this way - ie.
cascode operation available from a single device with one current
carrying path - but to my knowledge no equivalent has ever been produced
for power FETs.
A pity, I threw away some old VMP4 devices only a few weeks ago in a
clear out of ancient and obsolete semiconductors as part of teh shack
rebuild, they would have been quite good for an active antenna. But I
guess one of the modern RF packaged MOSFETs designed for HF - UHF
transmitters (which still cost quite a lot) will probably do a better
job. Probably have a spare MRF150 somewhere.
Wish I'd never mentioned the Naval active antenna in the first place !
Andy G4JNT
Sorry abt the mine of mis-information. Army EF50 was ARP35 (also
CV1091,
CV1578). Still can't find a navy version......
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