Hi 10 MHz *is* a frequency at which you can find a pretty good $3 to $6 OCXO. I find that a bit amazing, but (at least right now) that’s how it seems to work. (and yes, they do have EFC).
Bob > On Jul 22, 2020, at 10:09 PM, paul swed <paulsw...@gmail.com> wrote: > > Looked at the KD2BD schematic and it is a 10 MHz VCTCXO. That seems > reasonable perhaps to find. > Regards > Paul > > On Wed, Jul 22, 2020 at 6:44 PM paul swed <paulsw...@gmail.com> wrote: > >> I was actually thinking about this quite a bit and perhaps I went the >> wrong way. >> That is a cheap vcxo class device. His unit was not an oven as I recall. >> Just maybe a bit too good was actually bad. >> Hard to say and no time to play right now. >> Regards >> Paul >> WB8TSL >> >> On Wed, Jul 22, 2020 at 6:06 PM Bob kb8tq <kb...@n1k.org> wrote: >> >>> Hi >>> >>> >>> >>>> On Jul 22, 2020, at 3:51 PM, paul swed <paulsw...@gmail.com> 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 <rcb...@atcelectronics.com> 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 -- time-nuts@lists.febo.com >>>>> To unsubscribe, go to >>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>> and follow the instructions there. >>>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>> and follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >>> >> > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.