Bob I attempted to use a OCXO a Piezo and could never get it to hold lock. Did invert the control and such. Anyhow, just wondering if I need a simpler sloppy VCTXO. No time to tinker. But I believe I have some really nice little 10 MHz vectron VCTCXOs. If that worked then what I am dealing with is an efc range control issue. Perhaps the swing is to large... Regards Paul WB8TSL
On Thu, Jul 23, 2020 at 8:58 AM Bob kb8tq <kb...@n1k.org> wrote: > 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. > _______________________________________________ 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.