Return-Path: Received: from rly-da02.mx.aol.com (rly-da02.mail.aol.com [172.19.129.76]) by air-da09.mail.aol.com (v121_r4.4) with ESMTP id MAILINDA094-a53495bddce295; Wed, 31 Dec 2008 16:02:26 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-da02.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDA023-a53495bddce295; Wed, 31 Dec 2008 16:02:09 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LI8CT-0006Nd-EZ for rs_out_1@blacksheep.org; Wed, 31 Dec 2008 21:01:57 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LI8CT-0006NU-23 for rsgb_lf_group@blacksheep.org; Wed, 31 Dec 2008 21:01:57 +0000 Received: from imo-m25.mx.aol.com ([64.12.137.6] helo=imo-m25.mail.aol.com) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LI8CS-0006gs-75 for rsgb_lf_group@blacksheep.org; Wed, 31 Dec 2008 21:01:57 +0000 Received: from G0MRF@aol.com by imo-m25.mx.aol.com (mail_out_v39.1.) id l.d3b.33b7d57a (14501) for ; Wed, 31 Dec 2008 16:01:49 -0500 (EST) From: G0MRF@aol.com Message-ID: Date: Wed, 31 Dec 2008 16:01:43 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 SE for Windows sub 5014 X-Spam-Flag:NO X-Karma: 0: X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55 Subject: LF: Re: WE2XGR/2 in JT65A mode last night Content-Type: multipart/alternative; boundary="-----------------------------1230757303" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_20_30,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-AOL-IP: 193.82.116.20 -------------------------------1230757303 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Interesting result Jim / Jay. I assume that the figure that varies between -17 and -23 is the receive value in dB. Given the observation about local noise then it may be the case that UK - USA could be achieved with 6 to 9dB less power. This is a very efficient mode. The magazine 'Dubus' this quarter has an article on communicating over the horizon with light by reflecting light modulated by JT65 off the clouds. Clearly various JT modes are being used at both extremes of the EM Spectrum. No wonder it's creator also holds a Nobel prize for Physics. Happy new year everyone. David G0MRF In a message dated 31/12/2008 18:20:04 GMT Standard Time, james.moritz@btopenworld.com writes: The total number of decodes at this QTH was 14. Most occured between 2348 and 0012, when there were 10 decodes out of a possible 13. The first decode occured at 2300 and the last at 0102. So these are over a similar period of time to G3XVL's reception, although differently distributed. I think more decodes would have occured if the level of mains noise here last night had been lower. -------------------------------1230757303 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Interesting result Jim / Jay.

I assume that the figure that varies between -17 and -23 is the receive= =20 value in dB.

Given the observation about local noise then it may be the case that UK= -=20 USA could be achieved with 6 to 9dB less power.

This is a very efficient mode. The magazine 'Dubus' this quar= ter=20 has an article on communicating over the horizon with light by reflecting li= ght=20 modulated by JT65 off the clouds.

Clearly various JT modes are being used at both extremes of the EM=20 Spectrum. No wonder it's creator also holds a Nobel prize for=20 Physics.

Happy new year everyone.

David G0MRF

In a message dated 31/12/2008 18:20:04 GMT Standard Time,=20 james.moritz@btopenworld.com writes:

The=20 total number of decodes at this QTH was 14. Most occured between 2348
= and=20 0012, when there were 10 decodes out of a possible 13. The first decode=20
occured at 2300 and the last at 0102. So these are over a similar peri= od=20 of
time to G3XVL's reception, although differently distributed.
I=20 think more decodes would have occured if the level of mains noise here=20
last night had been lower.

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