[time-nuts] WWVB PM Time Questions

[paul swed]

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 <kb8tq at n1k.org> wrote:

> Hi
>
>
>
> > On Jul 22, 2020, at 3:51 PM, paul swed <paulswedb at 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 <rcbuck at 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
> >>
> >>
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