Content-Type: text/plain; charset=iso-8859-1; format=flowed Return-Path: Received: (qmail 15722 invoked from network); 16 Mar 2001 08:45:02 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by extortion.plus.net with SMTP; 16 Mar 2001 08:45:02 -0000 Received: (qmail 11575 invoked from network); 16 Mar 2001 08:45:00 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 16 Mar 2001 08:45:00 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14dpl0-0000KD-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 16 Mar 2001 08:38:46 +0000 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14dpkm-0000K6-00 for rsgb_lf_group@blacksheep.org; Fri, 16 Mar 2001 08:38:32 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id IAA12560; Fri, 16 Mar 2001 08:40:50 GMT Received: (qmail 5551 invoked from network); 16 Mar 2001 09:29:39 -0000 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 16 Mar 2001 09:29:39 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: by gauntlet.mail.dera.gov.uk; id JAA22880; Fri, 16 Mar 2001 09:16:48 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma022765; Fri, 16 Mar 01 09:16:08 GMT Received: from FRN-MAIL-3.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Fri, 16 Mar 2001 08:42:53 +0000 Received: by frn-mail-3.dera.gov.uk with Internet Mail Service (5.5.2650.21) id ; Fri, 16 Mar 2001 08:37:24 -0000 Message-ID: <65AECDF1F89AD411900400508BFC869F9C03D2@pdw-mail-1.dera.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: LF: RE: EF50 Date: Fri, 16 Mar 2001 08:37:36 -0000 X-MS-TNEF-Correlator: <65AECDF1F89AD411900400508BFC869F9C03D2@pdw-mail-1.dera.gov.uk> MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: 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...... > -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.