Hi Roger! Yes, you're not the first to spot my error about ND, and my friend is trying to confirm where the WWVB LORAN C transmitter came from
I used to do hamfest talks on antennas for 160M and used several slides of the George, WA station. Last time I was there they had a Bobcat on the roof clearing ash from the Mt. St. Helens eruption. Ken - K0PP On Nov 28, 2014 1:41 PM, "Roger D Johnson" <n...@roadrunner.com> wrote: > Interesting! As a former LORAN C guy I'm happy that at least one > transmitter > found a new home. You mentioned earlier that the transmitter came from the > station in ND. However, the station in Lemoure, ND was an Omega station, > not LORAN C. > > 73, Roger CWO4, USCG (ret) > > > On 11/28/2014 3:18 PM, Ken G Kopp wrote: > >> I have a long-time close friend who's retired from >> the NBS in Boulder and was the project engineer >> on the NBS #7 cesium standard. After the recent >> reflector postings about WWV / WWVB I thought >> I would get first-hand recent information from him. >> >> The GPS satellites all carry on-board cesium >> standards that are synchronized with NTIS, and >> because of changes (below) to WWVB, cell phones >> remain the most accurate source of time for most of us. >> >> All the HF transmitters at Ft. Collins are the same TMC >> units that were put in service when the facility was built. >> The 2.5 and 20 MHz transmitters run at lower power due >> to propagation considerations. >> >> The time and other station-related voice info is sourced >> on site in Ft. Collins, and the various propagation and >> weather info comes from various "dial in" land-line >> sources. Hence the widely varying quality of these >> announcements. I forgot to ask about the individual >> who made the voice recordings ... >> >> Here's the most important info .... as of about a year >> ago the modulation scheme on WWVB (60 kHz) was >> changed (phase reversal each minute) and this has >> rendered most of the end-user equipment inoperative. >> Most (all ?) tracking receivers like the HP-117's are >> now useless without extensive modification. >> >> Most of the "atomic" clocks now in use ->do not<- synch >> to the current modulation scheme on the 60 kHz signal. >> This will explain the differences in displayed time on >> supposedly identical clocks and how some appear to >> not be getting sufficient enough signal to synchronize. >> >> He offered no comment on how to locate "consumer" >> clocks that -do- respond to the "new" modulation scheme. >> >> The 60 kHz transmitter is indeed an ex-LORAN C unit, >> and because of the higher power of the "new" transmitter >> the antenna system was rebuilt using material from the >> LORAN C site. >> >> The 20 kHz transmitter was "home made" by NBS staff >> at the old Beltsville, MD facility and moved to Ft. Collins. >> There is no longer an antenna for this transmitter and it >> will not return to the air. Trivia: The antenna was of >> such high-Q that a near-by thunderstorm system would >> often detune the system and cause the overload protection >> to trip the transmitter off. >> >> He suggests that a visit to the NBS website would be >> "informative". >> >> 73 >> >> Ken Kopp - K0PP >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to n...@roadrunner.com >> >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
