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LF: RE: EF50

To: [email protected]
Subject: LF: RE: EF50
From: "Talbot Andrew" <[email protected]>
Date: Fri, 16 Mar 2001 08:37:36 -0000
Reply-to: [email protected]
Sender: <[email protected]>
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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