Return-Path: Received: from rly-de09.mx.aol.com (rly-de09.mail.aol.com [172.19.170.145]) by air-de03.mail.aol.com (v121_r5.5) with ESMTP id MAILINDE033-503495c959143; Thu, 01 Jan 2009 05:06:31 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-de09.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDE098-503495c959143; Thu, 01 Jan 2009 05:06:10 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LIKR5-0002lm-0y for rs_out_1@blacksheep.org; Thu, 01 Jan 2009 10:05:51 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LIKR4-0002ld-Kz for rsgb_lf_group@blacksheep.org; Thu, 01 Jan 2009 10:05:50 +0000 Received: from imo-m20.mx.aol.com ([64.12.137.1]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LIKR3-0001Ry-QL for rsgb_lf_group@blacksheep.org; Thu, 01 Jan 2009 10:05:50 +0000 Received: from G0MRF@aol.com by imo-m20.mx.aol.com (mail_out_v39.1.) id l.bc1.45b76595 (42809) for ; Thu, 1 Jan 2009 05:05:34 -0500 (EST) From: G0MRF@aol.com Message-ID: Date: Thu, 1 Jan 2009 05:05:34 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: 0.8 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,MAILTO_TO_SPAM_ADDR=0.276,NO_REAL_NAME=0.55 Subject: LF: Re: JT65A and narrow modes Content-Type: multipart/alternative; boundary="-----------------------------1230804334" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.8 required=5.0 tests=HTML_20_30,HTML_MESSAGE, MAILTO_TO_SPAM_ADDR,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 -------------------------------1230804334 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 31/12/2008 22:36:57 GMT Standard Time, sthed475@telus.net writes: Hi David I've used JT65 to listen to cloud backscatter as well with a small laser radar system I built. If only someone else out here had such a rig :-) 73 Scott Hi Scott / Gary. I have tried JT65 and some early versions of the mHz bandwidth modulation systems using soundcards and lasers. Unfortunately the soundcard program, which was presented a couple of years ago at a microwave update by its US originator, suffered from drift in the soundcard reference oscillator. At the time I wondered if the system would work for LF, but given the problems I encountered with the laser, I didn't try to adapt it. Although I do have a 20mW laser TX, I can't try any cloud bounce from here as my QTH is only 5km from Heathrow airport. HNY David G0MRF - ( Best 2 way laser DX = 76.8km in good ol' CW) -------------------------------1230804334 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 31/12/2008 22:36:57 GMT Standard Time,=20 sthed475@telus.net writes:

Hi=20 David

I've used JT65 to listen to cloud backscatter as well with a=20 small laser
radar system I built. If only someone else out here=20= had=20 such a rig :-)

73 Scott

Hi Scott / Gary.

I have tried JT65 and some early versions of the mHz bandwidth modulati= on=20 systems using soundcards and lasers. Unfortunately the soundcard program, wh= ich=20 was presented a couple of years ago at a microwave update by its US originat= or,=20 suffered from drift in the soundcard reference oscillator.

At the time I wondered if the system would work for LF, but given the=20 problems I encountered with the laser, I didn't try to adapt it.

Although I do have a 20mW laser TX, I can't try any cloud bounce from h= ere=20 as my QTH is only 5km from Heathrow airport.

HNY

David G0MRF - ( Best 2 way laser DX =3D 76.8km=20= in=20 good ol' CW)

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