Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6B03E3800009C; Tue, 10 Jan 2012 17:13:04 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Rkjva-0007Z4-Ji for rs_out_1@blacksheep.org; Tue, 10 Jan 2012 22:12:22 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Rkjva-0007Ys-4x for rsgb_lf_group@blacksheep.org; Tue, 10 Jan 2012 22:12:22 +0000 Received: from smtpout2.wanadoo.co.uk ([80.12.242.42] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RkjvY-0001wr-2t for rsgb_lf_group@blacksheep.org; Tue, 10 Jan 2012 22:12:22 +0000 Received: from AGB ([2.26.14.211]) by mwinf5d17 with ME id KyCE1i00e4ZD7yy03yCE3j; Tue, 10 Jan 2012 23:12:14 +0100 Message-ID: From: "Graham" To: References: <3BD3153722394C9E9F82E099417C1957@AGB><2FD661C8B18F4039B16D286CC3D52630@AGB> In-Reply-To: Date: Tue, 10 Jan 2012 22:12:14 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 120110-1, 10/01/2012), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=disabled,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: opera 137 beacon going Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=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-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:463244704:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d4acf4f0cb7f0699f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Ok Andy No problem , may be some one will take a look for you ? you may need to drop to Op31 , but what ever the decode you can work back over the min power req GL -G. -------------------------------------------------- From: "Andy Talbot" Sent: Tuesday, January 10, 2012 10:01 PM To: Subject: Re: LF: opera 137 beacon going > No, the only Tx I have for LF these days is the 700 Watt job. Its > switch mode . > Changing taps may bring it down to 300 watts, but no less. > > I'll have a look though the junk-junk box (stuff destined for rallies > / dismantling etc) - may still have a QRP Tx from years gone by, > probably a 73kHz one that should go at 137 > > But it would be nice to be copied in the US using the QRO. Something > I'd never thought likely with this antenna ever before. > > Andy > www.g4jnt.com > > > On 10 January 2012 21:21, Graham wrote: >> Opps >> >> Spent so long on op2 , just realises your OP8 >> OP8 -32dB Op31 -38 dB S/N Mean (not peak) 21:07 136 G8IMR de G4WGT Op8 >> 314 >> km -18 dB in Coppull, nr Preston >> >> That is +20 dB over the s/n limit .. you should be ok down to 600 >> >> >> 60 >> .... 6 watts >> Can you reduce to that level ? >> >> G..300 >> >> >> >> >> -------------------------------------------------- >> From: "Andy Talbot" >> Sent: Tuesday, January 10, 2012 8:04 PM >> To: >> Subject: Re: LF: opera 137 beacon going >> >> >>> 600 Watt of Rf to 7m high Tee with Gnd loss about 80 ohms. I reckon >>> about -40dBi gain so call it a few tens of mW >>> >>> Andy >>> >>> On 10 January 2012 19:58, Graham wrote: >>>> >>>> Reaching Gary with +7 dB in hand , what is the carrier power ? >>>> >>>> Be very interesting to see what the s/n would be from MAL >>>> over similar range and similar path , with all that wire out >>>> should be able to catch Andy's beacon into the +dB scale >>>> >>>> G.. >>>> 18:49 136 G8IMR de G4WGT Op8 314 km -19 dB in Coppull, nr Preston >>>> >>>> -------------------------------------------------- >>>> From: "Andy Talbot" >>>> Sent: Tuesday, January 10, 2012 4:06 PM >>>> To: >>>> Subject: LF: opera 137 beacon going >>>> >>>>> Having had to modify a 137kHz source to be able to generate on-off >>>>> keying, I'm transmitting a signal using 2.048s symbol mode on 137420Hz >>>>> 33% duty cycle (for now) >>>>> >>>>> This is based around my PIC generator for the mode >>>>> Details at http://www.g4jnt.com/PIC_Opera_Source.pdf and >>>>> http://www.g4jnt.com/OperaBeacon.zip >>>>> >>>>> As its an independent source, with no PC in the Tx chain - no IP >>>>> packets will be sent to t'web showing the details >>>>> >>>>> and its definitely gettign out.... >>>>> >>>>> 15:46 136 G8IMR de F6CNI Op8 391 km -28 dB in 136 kHz dial nr Paris >>>>> >>>>> >>>>> Andy >>>>> G4JNT >>>>> >>>> >>> >> >