Hi
> On Jul 22, 2020, at 3:51 PM, paul swed <[email protected]> wrote: > > Ray watch out for my comment on the KD2BD solution. That oscillator isn't > available and I have not been able to map something else into it. Tried > several good grade Oven oscillators. Just be aware of that issue. > Would need to do more tinkering and simply don't have that time right now. > Also it would be great if the oscillator was something that could be > obtained at a reasonable cost. I do not believe at all it has to be a > OCXO as the older true time and spectracoms were not and they locked solid. > So its a case of getting the control voltages right. You can buy a surprisingly good little OCXO (for the price) on eBay these days in the $3 to $6 range. Find one at 12.6 MHz and it will divide nicely to 60 KHz. 19.2 MHz looks like a better candidate … Either way I have not (yet) seen a 60 KHz multiple show up in the cheap category. Bob > Regards > Paul. > > On Wed, Jul 22, 2020 at 3:29 PM <[email protected]> wrote: > >> Thanks to all for the suggestions. I dug a ferrite rod AM radio antenna >> out of the box this morning. I have a box of 10 left over from the late >> 80s. It measures 0.950 mH so I will add some turns to get it to 1.5 mH >> which will be easier to resonate at 60 kHz. Then I need to build up the >> RF amp and run the output through a 60 kHz crystal filter. I have to >> order the crystals since I don't have any on hand. It will take a couple >> of weeks to get the front end working. >> >> I am in Phoenix so the WWVB signal is of decent quality here even during >> the daytime. My 25 year old cheap Casio watch will sync up within 2-3 >> minutes any time of day or night. It normally syncs at 2 am but I have >> done tests to confirm daytime sync works reliably. >> >> Mark, I know virtually nothing about SDR other than it works. I bought a >> RTL-SDR.Com module a couple of years ago and played with it a little >> bit. But it quit working and I haven't thought about SDR since then. My >> Icom 7300 is a SDR and it works very well. I think to attempt to design >> a SDR would be well over my head. I anticipate this project taking 2-3 >> months. If I get it working I will be glad to share everything with the >> group. >> >> Lester and Paul, I will test with the Costas loop as it may be the >> easiest way to go. To test the Costas loop I am basically going to >> duplicate the KD2BD design. I was reluctant about it in the beginning >> but more reading seems to indicate it will be fine. My AWG allows me to >> set the phase from 0 to 360 degrees independently on each channel so I >> can use that for initial testing. That testing can be done prior to >> getting the front end working. >> >> Richard, is your software posted somewhere? I assume it allows you to >> specify the time and date you want it to send. That would come in handy >> for writing the code to extract the timer/date data. I have seen >> examples of the Arduino transmitting the old AM signal but don't recall >> seeing one that sends the BPSK stream. >> >> I have a GPS time receiver with a 1.2 inch LED display that I built a >> couple of years ago. I have it setup so the UART outputs the gprmc NEMA >> string in case I want to look at it. I have a couple of spare GPS >> modules lying around and several Arduino Uno modules. I have no problem >> picking up the GPS satellites using only the patch antenna that is built >> into the modules. >> >> 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.
