Envelope-to: dave@picks.force9.co.uk Delivery-date: Tue, 28 Feb 2006 18:29:41 +0000 Received: by ptb-mxcore01.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1FE9bR-0007f0-CL for dave@picks.force9.co.uk; Tue, 28 Feb 2006 18:29:41 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (PlusNet MXCore v2.00) id 1FE9bR-0007es-6V for dave@picks.force9.co.uk; Tue, 28 Feb 2006 18:29:41 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1FE9bA-0000HV-En for rs_out_1@blacksheep.org; Tue, 28 Feb 2006 18:29:24 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FE9bA-0000HM-1j for rsgb_lf_group@blacksheep.org; Tue, 28 Feb 2006 18:29:24 +0000 Received: from imo-m14.mx.aol.com ([64.12.138.204]) by relay1.thorcom.net with esmtp (Exim 4.51) id 1FEB4y-0008C8-2S for rsgb_lf_group@blacksheep.org; Tue, 28 Feb 2006 20:04:31 +0000 Received: from GandalfG8@aol.com by imo-m14.mx.aol.com (mail_out_v38_r7.3.) id l.1c3.3af086b9 (39954) for ; Tue, 28 Feb 2006 13:27:41 -0500 (EST) From: GandalfG8@aol.com Message-ID: <1c3.3af086b9.3135f01d@aol.com> Date: Tue, 28 Feb 2006 13:27:41 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 SE for Windows sub 5014 Subject: Re: LF: NAVSTAR Content-Type: text/html; charset=windows-1252 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SpamFiltered: by PlusNet MXCore (v2.00) Content-transfer-encoding: 8bit

In a message dated 28/02/2006 16:55:00 GMT Standard Time, g3kev.ham@virgin.net writes:

I have a ships small LF antenna NAVSTAR. It is enclosed in a white plastic
case and the actual antenna is a single sided copper clad board 475 mm long
by 35 mm wide. This is attached to an amplifier with 3 transistors, one
2N3823 and two 2N3904, there are two pot cores at the output side going to
the coax to RX.

Hi Mal

Navstar made equipment for use with the Decca Navigator chain, frequencies from approx 70 to 100 KHz, and it sounds like what you've got might be one of the antennas from that.

I had some Navstar kit in the past and found it almost impossible to find information.

Unless anybody knows better I'd suggest tracing the circuit yourself as it sounds fairly simple.

Marine low voltage was generally 24 but starting at 12 and seeing how it goes probably wouldn't hurt.

As long as it's not tuned it could be quite useful as a general antenna for LF.

regards

Nigel

G8PZR