Return-Path: Received: (qmail 1359 invoked from network); 8 Aug 2002 10:51:02 -0000 Content-Transfer-Encoding: 8bit Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 8 Aug 2002 10:51:02 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 4167 invoked from network); 8 Aug 2002 10:51:12 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 8 Aug 2002 10:51:12 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17cmXj-00061s-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 08 Aug 2002 13:37:31 +0100 Received: from relay.dera.gov.uk ([192.5.29.49]) by post.thorcom.com with smtp (Exim 3.33 #2) id 17cmXi-00061n-00 for rsgb_lf_group@blacksheep.org; Thu, 08 Aug 2002 13:37:30 +0100 Received: (qmail 8631 invoked from network); 8 Aug 2002 11:46:03 +0100 Received: from butterfly.mod.uk (HELO warlock.dstl.gov.uk) (192.5.29.10) by relay.dera.gov.uk with SMTP; 8 Aug 2002 11:46:03 +0100 Message-ID: <7D653C9C42F5D411A27C00508BF8803DCB9B6E@mail.dstl.gov.uk> From: "Talbot Andrew" To: "LF Group \(E-mail\)" Subject: LF: Jason tests and (off topic) VHF beacon t ansmission Date: Thu, 8 Aug 2002 11:45:35 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: I'll carry on with the Jason test transmissions tonight. Generally the Tx is turned on when I get home, around 1600z and turned off at 2230z - so may as well continue with that. Having seen Alan's sceen dump of last night's reception it looks to have about 50% character error rate, which corresponds roughly to a 10% bit error rate - not bad for 212km with 4 Watts of RF and a tiny antenna ! Nothing seen on 7000.003kHz so far........ If anyone wants to try something slightly different again, there is a SLOWCW beacon using 1 second dot Frequency Shift Keying (20 Hz shift) on 70.0297 MHz signing G4JNT/P from locator IO80UU in Dorset. Spectrogram on its narrowest setting is ideal for monitoring this. The frequency varies a few tens, even 100 - 150 Hz over temperature as it uses an unovenned crystal so you may be forced to tune around a bit in particularly hot or cold weather. This beacon transmits telemetry for the GB3SC# set of microwave beacons on 2.3 to 24GHz, indicating mains voltage and current, DC supply voltage, shack temperature and two switch parameters. It runs 0.5 W to a dipole from the hilltop site. Andy G4JNT "This e-mail is intended for the recipient only. If you are not the intended recipient you must not use, disclose, distribute, copy, print, or rely upon this e-mail. If an addressing or transmission error has misdirected this e-mail, please notify the author by replying to this e-mail." "Recipients should note that all e-mail traffic on MOD systems is subject to monitoring and auditing."