Hi Even if you get the 60 KHz process working, a $20 GPS module ( or maybe $50) will do a much better job. That’s not saying *don’t* do the WWVB stuff. Just realize it’s limitations. A second limitation is that the new phase modulation process makes comparison a bit more complex.
60 KHz noise can be measured with any of a number of SDR’s that tune down there. An RTL-SDR probably isn’t ideal, but there are a lot of sub $200 devices that will do very well. Once you have a tuner you need a “standard” antenna (if this is for noise). Some sort of single turn loop is probably the best bet. Assuming the input to the SDR comes pre-calibrated you are ready to go. If it’s not calibrated you will need to squirt a test tone of known level in at 60 KHz to calibrate it ( likely a one time thing). 60 KHz reception is a bit iffy these days. The low cost world *loves* 60KHz as a switcher frequency. It only takes one of them near your reception site to mess things up. The E-field probe vs loop debate has been going on for at least a century by now. I’d go with some sort of loop. With a proper location, either can work well. Lots of fun …. Bob > On May 5, 2018, at 9:17 AM, Ulrich Rohde via time-nuts <[email protected]> > wrote: > > > I am trying to use the 60 KHz for synchronization of a Rb receiver. The local > NJ noise and the signal in dBuV are about the same with an active antenna, > electric field. A better solution might be a ferrite selective antenna, H > field , if I find one. > > 73 de N1UL > > > In a message dated 5/5/2018 4:09:25 AM Eastern Standard Time, > [email protected] writes: > > > Review/background: I have an UltraLink 333 WWVB receiver. It didn't work. > Several weeks ago. a discussion here mentioned that the phone cable between > the main box and antenna needs to be straight through rather than the typical > reversed. That was my problem. With the correct cable, the meter shows > signal and bounces around such that with practice, I could probably read the > bit pattern. But it didn't lock up. > > That was several weeks ago. I left it running. When I looked last night, it > had figured out that it is 2018. I wasn't watching or monitoring, so I don't > know how long it took. > > I assume the problem is noise. Is there any simple way to measure the noise > around 60 KHz? How about not so simple? > > Extra credit for a way that others nuts can reproduce so we can compare the > noise at my location with other locations. > > Can any audio cards be pushed that high? I see sample rates of 192K, but I > don't know if that is useful. > > I'd also like to measure the propagation delays on WWV so a setup for HF that > also works down to 60 KHz would be interesting. > > ---------- > > The UltraLink documentation says the display has a slot for a C or H. The C > is for Colorado and the H is for Hawaii. Did WWVH have a low frequency > transmitter many years ago? The NIST history of WWVH doesn't mention it. > > My guess is a cut+paste from a version that listened to WWV/WWVH. > > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > 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.
