Return-Path: Received: (qmail 15892 invoked from network); 8 Jan 2005 13:29:44 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 8 Jan 2005 13:29:44 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CnGeH-00060x-Nn for dave@picks.force9.co.uk; Sat, 08 Jan 2005 13:28:58 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CnGeH-00060s-EM for dave@picks.force9.co.uk; Sat, 08 Jan 2005 13:28:57 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1CnGf1-000IOL-Gz for dave@picks.force9.co.uk; Sat, 08 Jan 2005 13:29:43 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CnGdr-0007U5-9s for rs_out_1@blacksheep.org; Sat, 08 Jan 2005 13:28:31 +0000 Received: from [193.82.59.20] (helo=relay.omnieng.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CnGdm-0007Tw-NM for rsgb_lf_group@blacksheep.org; Sat, 08 Jan 2005 13:28:26 +0000 Received: from imo-d04.mx.aol.com ([205.188.157.36]) by relay.omnieng.net with esmtp (Exim 4.41) id 1CnGdi-0005HH-6M for rsgb_lf_group@blacksheep.org; Sat, 08 Jan 2005 13:28:25 +0000 Received: from G0MRF@aol.com by imo-d04.mx.aol.com (mail_out_v37_r3.8.) id l.f6.4768d044 (2168) for ; Sat, 8 Jan 2005 08:20:40 -0500 (EST) From: G0MRF@aol.com Message-ID: Date: Sat, 8 Jan 2005 08:20:40 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 SE for Windows sub 5003 X-SPF-Result: relay.omnieng.net: domain of aol.com designates 205.188.157.36 as permitted sender X-Spam-Score: 1.1 (+) X-Spam-Report: autolearn=no,HTML_30_40=0.809,HTML_MESSAGE=0.001,NO_REAL_NAME=0.285 Subject: Re: LF: Re: Pre-amps on LF Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_30_40,HTML_MESSAGE, NO_REAL_NAME autolearn=no version=2.63 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

In a message dated 08/01/2005 13:06:07 GMT Standard Time, Bernd.Grupe@t-online.de writes:

"Uwe Wensauer" <uwe.wensauer@gmx.de> schrieb:

Hi David, In order to improve the sensitivity for regular Amateur (Ja- Rig) a Pre- Amp is needed.I was looking at Your homepage and found such a Pre- Amplifier. Could You tell me, whats the Value for L1 and L2 is. I´m noch lucky in on order to pin down the TOKO Coil 707VXA016YKS ( is that a zero or a null ?)May be I can find similar Coils if I would know more parameters Many thanks Uwe, DK1KQ

Uwe.

As supplied by Toko, the variable Inductor measures 235uH. They require a small adjustment of the ferrite core to bring them onto 136kHz. You can probably calculate the final value from the resonating capacitor values used in the pre-amp.

Regards

David