Hi The gotcha with carrier phase is that it is a bit more sensitive to local signals than your ear is. Yes, a lot depends on your antenna setup and as you mention, just how many watts of distribution and thousands of feet of cable you are running 10 MHz through.
Bob > On May 29, 2017, at 11:00 AM, Tim Shoppa <tsho...@gmail.com> wrote: > > Bob, unlike the guys who have many watts of 10MHz running around their labs > via multiple distribution amplifiers, I do not have a big problem with my > dinky 10MHz reference leaking into my radio antenna :-). > > This fall the "best band" for WWV for me during daylight eclipse would be > 15MHz. 10MHz would have a usable but weaker signal mid-day too. > > I was thinking I could synthesize a clean 14.99MHz from my 10MHz, put that > into a mixer along with WWV at 15MHz, and send the 10kHz beat note into one > channel of a PC sound card. The other channel of the sound card could > monitor the Z3801A's 1PPS square wave output, or maybe just the square wave > from dividing 10MHz down to audio frequency square wave. That would allow > me to post-process out any variation in sound card clock. > > I should read up on what the FMT guys do. They must do something like this. > I work Connie K5CM almost every week anyway but we are just exchanging > serial numbers, not talking about FMT techniques :-). > > Tim N3QE > > On Mon, May 29, 2017 at 8:30 AM, Bob kb8tq <kb...@n1k.org> wrote: > >> Hi >> >> There are a *lot* of SDR boards out there today. The HackRF One is a pretty >> cheap one (you get what you pay for …). They go up to some very expensive >> setups by National Instruments / Ettus. Most of them allow for an external >> clock >> input. The usual isolation issues will still apply when checking WWV at 10 >> MHz. >> Coming up with isolation vs your local standard will be really tough. I >> would aim >> at 5 and 15 MHz. Of course if you have a Lucent KS box, that sort of rules >> out >> 15 MHz :) >> >> Bob >> >> >> >>> On May 29, 2017, at 8:03 AM, Tim Shoppa <tsho...@gmail.com> wrote: >>> >>> During regular night/day cycles I can just barely observe the night-day >>> shift in WWV propagation from Colorado to my location near Washington DC, >>> using the NTP WWV audio refclock. It amounts to a few hundred >> microseconds >>> of shift. I last touched that code about 15 years ago. >>> >>> Now that I have a 10MHz GPS OCXO (well, I've had that for about 15 years >>> too, getting that was the reason I stopped dinking with the WWV audio >>> refclock) I wonder if there's some simple hardware I could build that >> would >>> let me do superior carrier-phase type measurements on WWV propagation. >> If I >>> could see the night-day shift more clearly then I might see an >> ionospheric >>> effect during the upcoming August 21 eclipse, which nicely traces a path >>> from west to east not too far off the line between Ft Collins and my >>> location. >>> >>> Tim N3QE >>> >>> On Sun, May 28, 2017 at 6:17 PM, iovane--- via time-nuts < >> time-nuts@febo.com >>>> wrote: >>> >>>> On august 21 2017 a solar eclipse will sweep USA from coast to coast. A >>>> lifetime opportunity to do coordinated experiments to check this or >> that. >>>> One of the questions that doesn't have a final answer yet is whether or >> not >>>> solar eclipses could affect the flow of time. They exist conflicting >>>> reports: Negative: http://www.nature.com/nature/ >> journal/v402/n6763/full/ >>>> 402749a0.html Positive: http://home.t01.itscom.net/ >>>> allais/blackprior/zhou/zhou-1.pdf http://home.t01.itscom.net/ >>>> allais/blackprior/zhou/zhou-2.pdfPersonally I believe that the positive >>>> results were due to spurious responses of the atomic clocks to something >>>> else than gravity, or the clocks failed for some reason (e.g. jumping >>>> crystals then steered), or lower quality clocks had been sold to China. >>>> Anyway the recorded data do show an anomaly.As far as I know, no atomic >>>> clock tests are planned anywhere for that circumstance, but sincerely I >>>> don't believe this is the truth.Maybe the US time-nuts community, using >> its >>>> plenty >>>> of atomic clocks, could give the final answer doing tests during the >>>> above mentioned eclipse.US time-nuts, what about the idea of doing >>>> yourselves a large scale coordinated test? Or do you actually believe >> that >>>> this question is already definitively closed?(Even discovering that >> atomic >>>> clocks might respond to someting else than gravity would be of great >>>> interest).Antonio I8IOV >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to https://www.febo.com/cgi-bin/ >>>> mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.