Return-Path: Received: from rly-ma06.mx.aol.com (rly-ma06.mail.aol.com [172.20.116.50]) by air-ma06.mail.aol.com (v125.7) with ESMTP id MAILINMA061-8b14ab4d6b2295; Sat, 19 Sep 2009 09:04:02 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-ma06.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMA063-8b14ab4d6b2295; Sat, 19 Sep 2009 09:03:48 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Mozag-0003XI-4Y for rs_out_1@blacksheep.org; Sat, 19 Sep 2009 14:03:02 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Mozaf-0003X9-J7 for rsgb_lf_group@blacksheep.org; Sat, 19 Sep 2009 14:03:01 +0100 Received: from [193.252.22.190] (helo=smtp6.freeserve.com) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1MozZW-0007EA-KQ for rsgb_lf_group@blacksheep.org; Sat, 19 Sep 2009 14:01:51 +0100 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3614.me.freeserve.com (SMTP Server) with ESMTP id 842707000085 for ; Sat, 19 Sep 2009 15:02:47 +0200 (CEST) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3614.me.freeserve.com (SMTP Server) with ESMTP id 771987000086 for ; Sat, 19 Sep 2009 15:02:47 +0200 (CEST) Received: from AGB (unknown [91.109.3.20]) by mwinf3614.me.freeserve.com (SMTP Server) with SMTP id EA3807000085 for ; Sat, 19 Sep 2009 15:02:46 +0200 (CEST) X-ME-UUID: 20090919130246959.EA3807000085@mwinf3614.me.freeserve.com Message-ID: <39B89124D57D4F9D98543DC2D9A1FC13@AGB> From: "Graham" To: References: In-Reply-To: Date: Sat, 19 Sep 2009 14:02:46 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8064.206 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8064.206 X-Karma: unknown: X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,HTML_TAG_EXIST_TBODY=0.126 Subject: Re: LF: 'JNT Dual purpose beacons Content-Type: multipart/alternative; boundary="----=_NextPart_000_00BE_01CA3931.DD402630" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.0 required=5.0 tests=HTML_30_40,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY,MISSING_OUTLOOK_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 ------=_NextPart_000_00BE_01CA3931.DD402630 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Andy, As the 502.4 dial frequency looks to be accepted , with other stati= ons moving in to the capture area when running wspr and as it would= seem, AA1A is monitoring this dial setting a frequency in the lower= part of the wspr section would ensue a clear frequency, activity lo= oks to be centred in the higher portion of the band ?=20 These look to be the first wspr spots , of which I assume to be the= 'first established permanent wspr beacon' ? 2009-09-19 12:06 G4JNT 0.503855 -9 0 IO90iv 0.2 G3= XVL JO02nb 212 51 =20 2009-09-19 12:06 G4JNT 0.503850 -23 0 IO90iv 0.2 = M0LMH IO93gx 343 358 =20 2009-09-19 12:06 G4JNT 0.503850 -1 0 IO90iv 0.2 = M0BMU IO91vr 119 39 =20 Power wise , during daylight , your ground wave looks to be simply= a function of power , at -23 at 343 k with 100 watts ? , you coul= d reduce by 10dB to 10 watts and still provide ground wave data ? ,= in tests last year with Rick ON7T , carrier levels below 1 watt st= ill decoded at range.=20 I will up date the beacon page on uk500khz to include the new mode= =20 73 - G .=20 From: Andy Talbot=20 Sent: Saturday, September 19, 2009 12:06 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: 'JNT Dual purpose beacons I'm in the last stages of modifying my beacon to include a WSPR transm= ission that will run pseudo-simultaneously with the 15 minute regular= one at 503.7kHz It has turned out to be posible to fit all the code into one controlle= r PIC which simplifies the hardware considerably - the only downside= is that the PSK31 message length has had to be shortened by a few cha= racters to be able to get the additional WSPR symbol and frequency inf= ormation into the EEPROM area of the PIC. I've included to option to be able to transmit the WSPR signal at a lo= wer amplitude than the 15 minute beacon, and the pseudo random timing= is anything but - it has been chosen to fit round the 15 minute inter= vals, and preferably not adjacent to them. =20 Before I programme-up the actual beacon Tx, can I have some suggestion= on the frequency that would be best to avoid existing users, and what= sort of power to adopt, bearing in mind the main Tx runs at about 100= Watts of RF giving somewhere in the region of 24dBm ERP. Also some= idea of a duty cycle to use - 50% is the maximum I've allowed for. Andy www.g4jnt.com this email has been scanned for political correctness by the nanny sta= te ----------------------------------------------------------------------= ---------- No virus found in this incoming message. Checked by AVG - www.avg.com=20 Version: 8.5.409 / Virus Database: 270.13.105/2380 - Release Date: 09/= 18/09 07:49:00 ------=_NextPart_000_00BE_01CA3931.DD402630 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Andy,
 
As the  502.4 dial frequency loo= ks to =20 be  accepted , with other stations moving in to  the&nb= sp;=20 capture area when running  wspr and as it would seem, AA1A= is=20 monitoring this dial setting  a frequency in the lower = part of=20 the wspr section would  ensue a clear frequency, activity looks= to =20 be  centred in the  higher portion of the  band ?
 
These look to be the  first wspr= spots , of=20 which I assume to be the  'first established permanent wspr = beacon'=20 ?
 
2009-09-19 12:06   G4JNT   0.503855   -9   0   IO90iv   0.2   G3XVL   JO02nb   212   51 
 2009-09-19 12:06   G4JNT   0.503850   -23   0   IO90iv   0.2   M0LMH   IO93gx   343   358 
 2009-09-19 12:06   G4JNT   0.503850   -1   0   IO90iv   0.2   M0BMU   IO91vr   119   39 
 
Power wise , during daylight , your= ground wave=20 looks to  be  simply a function of  power , at  -2= 3  at=20 343 k with 100 watts ? , you  could reduce by  10dB to = 10 watts=20 and still provide ground wave data ? , in tests last  year = with =20 Rick ON7T , carrier levels below 1 watt still decoded at  range.= =20
 
I will up date the beacon page on uk5= 00khz to =20 include the  new mode
 
73 - G .
 
 


I'm in the last stages of modifying my beacon to= include a=20 WSPR transmission that will run pseudo-simultaneously with= the 15=20 minute regular one at 503.7kHz
 
It has turned out to be posible to fit all the code into one= =20 controller PIC which simplifies the hardware considerably - the only= downside is=20 that the PSK31 message length has had to be shortened by a few charact= ers to be=20 able to get the additional WSPR symbol and frequency information into= the EEPROM=20 area of the PIC.
 
I've included to option to be able to transmit the WSPR signal at= a lower=20 amplitude than the 15 minute beacon, and the pseudo random timing is= anything=20 but - it has been chosen to fit round the 15 minute intervals, an= d=20 preferably not adjacent to them.  
 
Before I programme-up the actual beacon Tx, can I have some sugge= stion on=20 the frequency that would be best to avoid existing users, and what sor= t of power=20 to adopt, bearing in mind the main Tx runs at about 100= Watts of=20 RF giving somewhere in the region of 24dBm ERP.  Also some= idea of a=20 duty cycle to use - 50% is the maximum I've allowed for.

Andy
www.g4= jnt.com

this email has been scanned=20 for political correctness by the nanny state


No virus found in this incoming message.
Checked by AVG= -=20 www.avg.com
Version: 8.5.409 / Virus Database: 270.13.105/2380 -= Release=20 Date: 09/18/09 07:49:00
------=_NextPart_000_00BE_01CA3931.DD402630--