Gary's reports always amaze me... Now I'm cliff top waiting : ) And yes it's very dark : ) just stepped out to water the grounds
Thanks derekvme...@aol.com ChannelDerek.carbonmade.com On Aug 20, 2013, at 7:23 PM, Nick Hall-Patch <n...@ieee.org> wrote: > Yours are really valid points Mark. Inland definitely can mean considerably > poorer signal strengths, and I would not be surprised if my "usual" sunrise > enhancements on TP signals are due to high arrival angles of the incoming > wave front (see my QEX article of some years ago for that very hypothesis). > > I certainly didn't expect anything like Gary's signal levels, but, as Gary > pointed out, Dennis, who is considerably further inland than I also heard a > couple of Asiatics quite well, and I heard practically nothing, even > carriers. In this case, it may have been that the farther north path to my > location from Asia had some attenuation on it that didn't affect the more > southerly paths, though conditions were not particularly auroral. Generally > this summer, Dennis and I have heard similar Asiatics on any given morning, > on the rare mornings that Asiatics were to be heard, though he does better > on the longwave Russians, and indeed on MW Asians as fall approaches. > > Thanks for your thoughts. Propagation continues to be mysterious! > > best wishes, > > Nick > > > > > > At 21:34 20-08-13, you wrote: > >> << >> It's hard to believe that we were listening on the same planet Gary, >> let alone the same coast, though admittedly, I'm quite a way from the >> open Pacific here. As I said yesterday, that morning was pretty >> much the biggest stinker this summer here. >> >> >> best wishes, >> >> >> Nick >> >> >> >> >> My home locations have always been a fairly easy commute to TA-capable shore >> sites: >> e.g. >> Arlington, MA: 7 miles (11 km) to Revere Beach >> Sudbury, MA: 20 miles (32 km) to Boston waterfront >> Billerica, MA: 15 miles (24 km) to Salem / Marblehead >> South Yarmouth, MA: 12 miles (19 km) to Chatham / Orleans >> >> >> These are air distances for typical 50-75 degree Euro bearings. Road >> distances to DXpedition sites are typically a bit more if only because the >> shore is heavily developed and only offers certain areas useful for DXing >> from the car. In my present case (S. Yarmouth), because of the contour of >> the shore, the drive to a usable site is actually shorter than the 50-75 >> degree bearing air distance house-to-shore. >> >> >> In all cases, the differences between home sites and the coastal DXpedition >> sites are HUGE. Some stations were routinely 30-40 dB stronger at the >> Granite Pier site in Rockport, MA versus less than an hour's drive away at >> Billerica. The 1544 (later 1550) Algerian clandestine station was one >> station which consistently exhibited this whopping difference. Long term >> comparisons were easy to make since I could use the same in-car receiver and >> rooftop antenna. >> >> >> East Coast inland versus shore differences are greatest in pre-sunset >> initial fade-ups and during aurora. The thinking is that the lower the >> arrival angle of the incoming station, the more difference near-field ground >> conductivity makes. There are numerous stations that cannot be heard at >> home sites on big antennas yet can be heard from time to time on a 2m by 2m >> car-roof loop at nearby beach sites. >> >> >> If a station arrives at a higher angle, the location characteristics are >> less critical and your inland signal may only be 15 to 20 dB degraded from >> what is noted at the shore. Old 1314 Norway during prime high latitude >> conditions (in mid/late evening) fell into this category. Sunrise at the >> European transmitter end could contribute to a higher incoming angle at the >> USA receiving end because an ionospheric tilt may contribute to fewer skip >> hops being required. >> >> >> On groundwave, as with low-angle skip, the differences are huge. V-Soft >> shows 660 WFAN (NYC) running 6.24 mV/m at Falmouth, MA 02543 (shore) and >> 0.45 mV/m at South Dennis, MA 02660 (about 15 miles / 24 km inland for 255 >> degree bearing towards station). In decibels, this equates to a 23 dB drop >> - and that's for a LOW-band station. A high-band station would show an even >> greater overland signal deterioration. The V-Soft groundwave variations >> don't look too different from what is routinely observed with low-angle >> long-haul DX skip. >> >> >> Mark Connelly, WA1ION >> South Yarmouth, MA >> _______________________________________________ >> 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