Hi You have a Cs to work with *plus* the pollution that comes from propagation and what ever is going on with your antenna and their antenna. Since you are dealing with phase to get anything useful, a swing in their (100 Hz wide) antenna could give you a pretty significant phase change when looking 1x10^-9 sort of level.
How much any of that’s enhanced by recovering modulation - don’t know. Does NAA have a twice daily dropout like WWVB? - don’t know. Bob On Aug 17, 2014, at 3:30 PM, paul swed <[email protected]> wrote: > OK > Couple of comments > NAA is 24KHz > Jim Creek is 24.8 as I recall. Anyhow westies might want Jim Creek in Wa. > I can here both on the east coast day or night with nothing spectacular at > all. > > That said I shared the tracor d-msk-r circuit with the group that removes > the msk. How does it pull that trick off? I do not get how it gets rid of > the msk and leaves the carrier. > > To Bobs comment. Interesting about the code. But with MSK removed you at > least have a CS reference to work with. It ain't wwvb, but for the > simplicity of it that would be very positive design for low cost. > > Regards > Paul > WB8TSL > > > On Sun, Aug 17, 2014 at 2:50 PM, Bob Camp <[email protected]> wrote: > >> Hi >> >> If you are going with an NAA receiver for frequency and time, I would not >> strip off the modulation. Recover it, time tag it once a second and work >> out a way to compare sequences between observers. If they are (still) >> transmitting random looking “stuff” the one second signatures should be >> reasonably unique. Net result would be getting “everything" (time ticks and >> frequency) from NAA that you would have from WWVB. >> >> Coverage area is pretty good. You should be able to get a wide range of >> people involved. >> >> Bob >> >> On Aug 17, 2014, at 2:23 PM, Kenneth G. Gordon <[email protected]> >> wrote: >> >>> On 17 Aug 2014 at 7:52, Burt I. Weiner wrote: >>> >>>> Gang, >>>> >>>> Just for fun I just tried to see if I could hear the signal on 24 kHz >>>> using my GPS referenced HP-3586B and a HP-3336A also GPS locked to >>>> compare the I.F. frequency using a 1:1 Lissajou pattern. It's 7:30 >>>> AM here in Los Angeles. I heard a signal but I doubt that it was >>>> NAA. >>> >>> Isn't NAA on 24.6 Khz? I am not certain of the frequency. >>> >>>> What time of the day would be best, probably when the entire >>>> path is dark? >>> >>> In my experience, here in North Idaho, and when I was in Missoula, MT, >>> athough the signal level rose and fell with diurnal variations in the >> amount or >>> lack of sunlight, it was ALWAYS there...at least as long as the >> transmitter >>> was in operation. >>> >>>> My antenna is a dipole about 30-feet on a side, which >>>> is really all I've got up at the moment. It's orientation favors >>>> that part of the country. I hear WWVB at 60 kHz almost all the time >>>> with that antenna. WWVB is quite recognizable because of the phase >>>> shift signature as seen on my X-Y display. >>> >>> If you are hearing WWVB, you most CERTAINLY will hear NAA...if they are >>> on the air. >>> >>> Into my location here, NAA is at least three times as strong as WWVB. >>> >>> Ken W7EKB >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
