On May 10, 2012, at 5:54 PM, Mark D Mobile wrote: > Boy Alex, I was hoping someone on the list had the answer. It was the sort > of noise that pervades the entire band; definitely not sparkling > atmospherics, just a continuous noise. It varied from day to day; Sunday for > example it had dropped a few db. > > Wish I knew more about the relationship of this sort of noise to solar noise > effects. Thom, do you have any thoughts? > > > Mark Durenberger > On the road > > -------------------------------------------------- > From: "Alex P" <winston...@yahoo.com> > Sent: Thursday, May 10, 2012 12:52 PM > To: "Mailing list for the International Radio Club of America" > <irca@hard-core-dx.com>; <m...@yahoogroups.com>; "Putrich Greg" > <gr...@n0qds.org>; "DX @NRC" <a...@nrcdxas.org> > Subject: Re: [IRCA] Beverage Antenna in Utah Part Two > >> Mark, >> >> Was wondering about the high noise level. Would you have an opinion on it's >> origin? >> Alex >> >> >> >> ________________________________ >> From: Mark D Mobile <ma...@durenberger.com> >> To: m...@yahoogroups.com; Putrich Greg <gr...@n0qds.org>; DX-IRCA >> <irca@hard-core-dx.com>; "DX @NRC" <a...@nrcdxas.org> >> Sent: Wednesday, May 9, 2012 5:23 PM >> Subject: [IRCA] Beverage Antenna in Utah Part Two >> >> REPORT 2: We concluded our work on Monday 5/7 and 'struck the set'. SDR >> recordings had been made over several evenings on both the elevated Beverage >> and the BOG (1800 feet). Mike's suggested antenna azimuth was validated by >> the high number of stations received in the corridor: Eastern >> Washington--Western Montana. I'll post the catch-list later as we look for >> the unlikely Alaska catches. I say unlikely BECAUSE: >> >> In addition to the weather issues we encountered an abnormally high noise >> level throughout the weekend. With the bandwidth we used (6 khz), the SDRs >> were displaying noise around -75 to -80 dbm. (I'm used to Beverage noise >> floors below -110.) This was one difficulty we just couldn't overcome. The >> noise (certainly QRN) was broadband and continuous, as opposed to the spiky >> stuff you hear when it's primarily atmospherics. >> >> Other measurements involved switching an SDR between the elevated Bev and >> the BOG and recording signal levels; both broadband and narrowband. These >> results and other data will be published later. To be determined on further >> playback is whether the BOG was performing as an electrically-longer antenna >> than the elevated...on this very dry desert floor. >> >> On one occasion when we lit up in daytime we heard a rhythmic interference >> spike several db above that dreaded broadband noise. Of interest is that >> this noise was greatly reduced when we switched from the elevated to the BOG. >> >> The single-wire remote beverage terminator worked very well, as noted >> earlier. >> >> >> Further Facts Follow From us Fools in the Field. >> >> >> Mark Durenberger >> On the road >> >> >> From: Mark D Mobile >> Sent: Sunday, May 06, 2012 11:22 AM >> >> .REPORT 1: >> >> My friend Mike and I set up two 1800-foot Beverages in the Eastern Utah >> desert...one is a BOG and the other elevated about 3 feet. Beverages are at >> 320 degrees; we're looking for Alaska. Counterpoises on the ends are four >> 300-foot radials of copper supplemented by ground rods. >> >> The new single-wire remote termination control has proved a great success. >> Even though the DC resistance on our dry-desert-earth path measures close to >> 2 megohms (!) the 'current amplifier' works well and drives a Vactrol for >> ideal termination. (Of course "ideal" is only for one frequency but the SDR >> does a nice job of showing the overall front-to-back changes.) >> >> We already know that it's working...those of you who've been in this area >> know how tough it can be to remove KOB 770 in favor of KTTH, and KOKC in >> favor of KKXA, without phasing...using only the F-B termination. >> >> Today's work will include measurements (with two SDRs) comparing the >> elevated Beverage and the BOG, logging RF levels across the MW band in >> various conditions of connectivity. Of particular interest is what we learn >> when the BOG (running directly under the elevated wire) is used as a >> counterpoise. Audio reports will appear on DXAS. >> >> The weather has been semi-adverse. Nice temps...but strong winds have meant >> DUST! Today however appears a bit more benign. >> >> We hope to share today's results in the next report. >> >> >> Mark Durenberger >> _______________________________________________ >> IRCA mailing list >> IRCA@hard-core-dx.com >> http://montreal.kotalampi.com/mailman/listinfo/irca >> >> Opinions expressed in messages on this mailing list are those of the >> original contributors and do not necessarily reflect the opinion of the >> IRCA, its editors, publishing staff, or officers >> >> For more information: http://www.ircaonline.org >> >> To Post a message: irca@hard-core-dx.com >> _______________________________________________ >> IRCA mailing list >> IRCA@hard-core-dx.com >> http://montreal.kotalampi.com/mailman/listinfo/irca >> >> Opinions expressed in messages on this mailing list are those of the >> original contributors and do not necessarily reflect the opinion of the >> IRCA, its editors, publishing staff, or officers >> >> For more information: http://www.ircaonline.org >> >> To Post a message: irca@hard-core-dx.com >> > > _______________________________________________ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the original > contributors and do not necessarily reflect the opinion of the IRCA, its > editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: irca@hard-core-dx.com >
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