Understood and did plenty of them. That means I am unclear as to whats required. But will for the moment let this drop. Its not my thread. Regards Paul.
On Thu, Jul 23, 2020 at 3:56 PM Bob kb8tq <[email protected]> wrote: > Hi > > Keep in mind that the EFC range is part of the control loop parameters. > When you change EFC range, you need to recalculate the control loop. > That likely means putting in different components in the control loop. > > Bob > > > On Jul 23, 2020, at 10:22 AM, paul swed <[email protected]> wrote: > > > > 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> wrote: > >>>> > >>>>> 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. > >>>>> > >>>> > >>> _______________________________________________ > >>> 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.
