Return-Path: Received: from rly-me10.mx.aol.com (rly-me10.mail.aol.com [172.20.83.44]) by air-me07.mail.aol.com (v125.7) with ESMTP id MAILINME074-9e24aa5882b1c8; Mon, 07 Sep 2009 18:25:06 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-me10.mx.aol.com (v125.7) with ESMTP id MAILRELAYINME106-9e24aa5882b1c8; Mon, 07 Sep 2009 18:24:46 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MkmcW-0000Th-Ci for rs_out_1@blacksheep.org; Mon, 07 Sep 2009 23:23:32 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MkmcV-0000TY-Ea for rsgb_lf_group@blacksheep.org; Mon, 07 Sep 2009 23:23:31 +0100 Received: from mcgi67.rambler.ru ([81.19.67.203]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1MkmcM-0001V1-Tw for rsgb_lf_group@blacksheep.org; Mon, 07 Sep 2009 23:23:25 +0100 Received: from [81.195.12.154] by mcgi67.rambler.ru with HTTP (mailimap); Tue, 08 Sep 2009 02:23:21 +0400 From: Roman RW3ADB To: Date: Tue, 08 Sep 2009 02:23:21 +0400 MIME-Version: 1.0 Content-Disposition: inline References: <0DC70E96227C4EC9BC7BAE8F482B7099@JimPC> <3A7882A6EA6F48CA92F0A32B5BF96535@JimPC> <516228955.1252269306.158883836.47093@mcgi29.rambler.ru> <227866042.1252271522.162474480.47434@mcgi37.rambler.ru> <504021971.1252281332.46912984.60539@mcgi67.rambler.ru> Message-Id: <1144023292.1252362201.46928120.77147@mcgi67.rambler.ru> X-Mailer: Ramail 3u, (untone), http://mail.rambler.ru X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,RCVD_IN_NJABL_PROXY=0.327 Subject: Re: LF: Re: WSPR/Questions Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; format="flowed" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 Hello James, OM & LF! Jim! We are need that QSO! Pse make any vertical 5-10m high for rx 40m! I think it will be good. Or loop/magnetic loop for 40m band rx! Prop on 500 is wonderful! Fantastic! 10m high antenna and solid copy in Moscow! Will be ready to x-band pse. I'm very interesting to 504 Khz stations. Some time I copy 539 in Moscow. China or east Russia I think! not RTE! Do not correlation with the G|GM stations here. 73! Roman * James Moritz [Mon, 7 Sep 2009 14:02:26 +0100]: > Dear Laurence, Roman, LF Group, > > I shut the beacon down at 0446utc this morning. The frequency was > 503.975kHz > as advertised. Thanks for the overnight reports, nice to see spots from > W1TAG again and from Russia for the first time. I transmitted in about > 75% > of the 2 minute periods between about 1940 and 2050utc, but saw nothing > like > a signal in the BY3 grabber, although the frequency seemed mostly clear. > Conditions were relatively noisy here with more QRN than the previous > night. > > The antenna is a top-loaded vertical with 3 wires in a sort of Y shape > in > the horizontal plane. Where the wires meet, it is supported by a 10m > fibreglass mast. To "jack up" the antenna, I have an old "cherry picker" > (or > aerial access platform or whatever you wish to call it) which is slowly > sinking into my lawn. The bottom of the mast is bolted to the cherry > picker > where the operator's basket used to be, so the whole mast can be raised > into > the air. This allows a total maximum height of about 19m if I am feeling > brave; last night the middle of the antenna span was raised to about > 17m. > Previous FS measurements have shown this gives about 3 - 4dB improvement > in > ERP due to the increased height and radiation resistance, along with a > slight reduction in loss resistance. The total length of wire in the > antenna > stays the same, but gets further from the ground, so antenna capacitance > actually reduces slightly. The things we do to try and get a better > signal... > > Cross-band QSOs from M0BMU are unfortunately difficult at the moment due > to > the high QRM levels on the lower HF bands here - I am hoping some work > on > dedicated HF receiving antennas here will improve this soon. > > The 504kHz signal seems to be present in many widely-seperated QTHs - > don't > know about W/VE though? It seems to be different at each location. Here > it > is a rather weak carrier with no audible modulation, on the spectrogram > it > can be seen to have a couple of stronger spectral lines and several > weaker > ones spread over a range of a few Hz. These seem to vary over time, > possibly > due to QSB. They can't all be RTE/Atlantic 252 harmonics - 504kHz is an > integer multiple of 9kHz, so many opportunities for internal or external > intermods due to broadcast stations. 504kHz is also a multiple of 8kHz, > as > is 136kHz - it was suggested at one time that the weak carriers audible > in > many places on 136.0kHz could be harmonics of the 8kHz clock rate used > in > wired telecomms. > > I would be quite interested to try WOLF again - although it needs more > careful coordination with frequencies than WSPR. > > Roman, there are some pdf files on the UK 500kHz group site about some > of my > LF/MF gear - you are welcome to use those if you like. > > Cheers, Jim Moritz > 73 de M0BMU > > -- Roman RW3ADB.