If you are looking for a serious ferrite rod antenna, then this is a good (but slow delivery) source http://stormwise.com/ go to: VLF Antennas, Antennas for Long Wave and 30 KHz - 530 KHz, Low Frequency Antenna 50 KHz - 90 KHz
Their part number 12LF50K90KBC, 50 KHz - 90 KHz antenna is a "Monster-size 12.3 inch long x 1.02 inch diameter ferrite rod" that will resonate to 60 kHz with an external 1000 pF capacitor. A three turn coil around the outside center of the tube will match it to 50 Ohms for using coax such as RG-174 to run it to a standard receiver input. I have one for receiving WWVB. It works well. Although I have not run the detailed test, yet, my impression is that, although the absolute signal level is higher, the signal to noise ratio for a received WWVB signal is no better than on a five or six inch ferrite rod. --- Graham On Sat, Oct 10, 2020 at 8:02 AM Ole Stender Nielsen via time-nuts < [email protected]> wrote: > A general comment on the use of Schmitt-trigger and counters on a > conditioned analog signal: > You will likely run into issues with missing counts or additional counts > when the receiver experiences fadings or glitches (lightning, etc.) > If this happens, the 60 kHz signal will jump in phase. > > Ole > > > Den 08-10-2020 kl. 20:07 skrev [email protected]: > > I have read several different articles where the WWVB phase shift is > > eliminated by doubling the signal to 120 kHz. Several members of the > > list have built these units. > > > > Assume I build a circuit to double the incoming signal and use a schmitt > > trigger to get a 120 kHz square wave. If I then divide that signal back > > down to 60 kHz will that signal be strong enough to swamp out the WWVB > > signal? I'm guessing it will be since it is at the 5 volt level and > > somewhere in the +25 dBm or greater range. > > > > Ray, > > AB7HE > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
