Return-Path: Received: (qmail 15282 invoked from network); 18 Oct 2003 23:07:38 -0000 Received: from unknown (HELO netmail01.services.quay.plus.net) (212.159.14.219) by mailstore with SMTP; 18 Oct 2003 23:07:38 -0000 Received: (qmail 16189 invoked by uid 10001); 18 Oct 2003 23:07:38 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from post.thorcom.com (193.82.116.20) by netmail01.services.quay.plus.net with SMTP; 18 Oct 2003 23:07:29 -0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AB09w-0004nk-Oi for rsgb_lf_group-outgoing@blacksheep.org; Sun, 19 Oct 2003 00:06:56 +0100 Received: from [212.1.130.141] (helo=smtp-1.visp.telinco.net) by post.thorcom.com with esmtp (Exim 4.14) id 1AB09w-0004nb-4G for rsgb_lf_group@blacksheep.org; Sun, 19 Oct 2003 00:06:56 +0100 Received: from [80.225.212.44] (helo=RSGB613192) by smtp-1.visp.telinco.net with smtp (Exim 3.36 #1) id 1AB09u-0005et-00 for rsgb_lf_group@blacksheep.org; Sun, 19 Oct 2003 00:06:55 +0100 X-Bad-Message-ID: no DNS (RSGB613192) Message-ID: <000f01c395cc$88ece780$045bfea9@RSGB613192> From: "Andy talbot" To: rsgb_lf_group@blacksheep.org References: <000c01c3957f$fbe6d4a0$47cdfc3e@l8p8y6> Date: Sun, 19 Oct 2003 00:06:55 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Re: 136 khz LF Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Rating: 2 Content-transfer-encoding: 8bit

You can't possibly mean -5dBm.

Even if propagation were line of sight, at 200km distance (near enough between you ?) Free space loss = 32.4+20LOG(f.d) [MHz, km] = 61dB. EIRP max 30dBm so max power received assuming you antenna were 100% efficient (!!!!) could only be -31dBm.

I don't think there can be a propgation mechnism at these freqs where path loss can be less than line-of-sight. Unlike ducting on microwave paths.

Andy G4JNT

----- Original Message -----

From: hamilton mal

To: rsgb_lf_group@blacksheep.org

Sent: Saturday, October 18, 2003 2:58 PM

Subject: LF: 136 khz LF

Band quiet today at my observation times. Did see G3YXM on QRS very strong signal at -5 dbm and 55 db signal above noise floor.

73 de Mal/G3KEV