Bob, Thanks for the answer; but does anyone actually have a documented specification posted for one of these 'massive' WWVB 60kHz antennas someplace?
Thanks. 73's, John AJ6BC On Fri, Oct 9, 2020, 08:35 Bob kb8tq <[email protected]> wrote: > Hi > > At least to me, anything dimensioned in the 100’s of feet is “massive” > compared to > the rod antennas normally seen in WWVB use …. > > The other point being that if the antenna is some sort of large loop, it’s > going to be > a good long ways away from the receiver. You get both a larger signal > voltage and better > isolation ….. > > Bob > > > On Oct 8, 2020, at 11:30 PM, John C. Westmoreland, P.E. < > [email protected]> wrote: > > > > Hello All, > > > > Are there any design details someplace regarding these massive antennas? > > > > Thanks, > > John > > AJ6BC > > > > > > On Thu, Oct 8, 2020, 19:27 paul swed <[email protected]> wrote: > > > >> Hello to the group. > >> Ray as Bob mentions you are taking a 10s of uv signal to a logic level > of > >> maybe 4V. > >> If the loop is any place close to the divided down signal, it will > >> oscillate. It would take incredible shielding to protect the receiver. > >> Thats why you often see a solution that doubles to 120 KHz and modifies > the > >> detectors to work at that frequency. That means hacking the radio > >> internally. Not fun. The other really annoy effect is that the doubling > >> slips phace due to noise and propagation. So if charting suddenly you > get a > >> 180 degree flip. Thats messy. > >> The doubling solution can work. Search for carter and there are several > >> others. > >> But having tested and used all of the alternates and lots more on the > east > >> coast decided they were too much trouble. You should see the box of > boards > >> I have chuckle. > >> For me I am very happy with the d-psk-r. Though in being above board I > >> designed version 1 and Rodger and I did version 2. Its solid and no > mods to > >> any receiver. Everything has always been released to the time-nuts > group. > >> As they say have fun. > >> Regards > >> Paul. > >> WB8TSL > >> > >> On Thu, Oct 8, 2020 at 5:39 PM <[email protected]> wrote: > >> > >>> Bob, > >>> > >>> I am using a ferrite rod antenna for the receiver. No outside antenna. > >>> > >>> Ray > >>> > >>> -------- Original Message -------- > >>> Subject: Re: [time-nuts] WWVB Dephaser Question > >>> From: Bob kb8tq <[email protected]> > >>> Date: Thu, October 08, 2020 12:40 pm > >>> To: Discussion of precise time and frequency measurement > >>> <[email protected]> > >>> > >>> Hi > >>> > >>> A lot depends on your antenna setup. You can also swamp out the > incoming > >>> WWVB signal……. > >>> > >>> Bob > >>> > >>>> On Oct 8, 2020, at 2:07 PM, <[email protected]> < > >>> [email protected]> wrote: > >>>> > >>>> 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. > >>> > >> _______________________________________________ > >> 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. > _______________________________________________ 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.
