Hello to the group. Have actually installed the loop antenna in the
basement. Its all working.
Had to use some telephone twisted pair to feed the antenna. At 60 KHz thats
a 15 db loss.
Could easily be made up with a small audio amplifier.
Free air transmission seems to be another 50 db. Thats
Achim
No offense taken and sorry if it appeared that way. The great thing about
time nuts is there is a diversity of opinions, guidance and help. I have
admired the DCF signal over the years and whats been done with it. You
mention studios and I also have been involved in Broadcast television so
paul swed writes:
> Indeed anything could be used if you want to modify the clocks. I
> don't.
Fair enough.
> They do what they do very well and consume 0 power.
Well, I assume there's some sort of battery involved, but anyway, this
line of discussion misses the point. Replacing one LF module
Bob
Fantastic to hear. You did the same thing I initially did and that was to
use a fluke 6060 gen locked to a GPSDO. (Not really needed but thats the
way I am set up.) Though I went further and created a good oscillator
divide chain and real modulator.
Per Bob s suggestion nothing more then a
Achim
Indeed anything could be used if you want to modify the clocks. I don't.
They do what they do very well and consume 0 power.
Can be placed in any location in the house or garage and even the basement.
Interestingly without the real wwvb I can orient them any way I want also.
The last thing I
paul swed writes:
> Hello to the group its time for a wwvb chronverter update. I used the loop
> antenna as Alex suggested. I added caps to resonate it sort of.
I am still a bit puzzled by this desire to feed the time in via LF
waves. Maybe WWVB clocks are more different from the MSF / DCF77
Hello to the group its time for a wwvb chronverter update. I used the loop
antenna as Alex suggested. I added caps to resonate it sort of. This added
a nice 6DB increase in output power as measured by a reference antenna to a
HP 3586 slvm. I did try a transformer going from 50 ohm to .75 ohm of
The UnusualElectronics Chronverter with NEO 6 GPS, 9.6 MHz oscillator.
dividers and such are all up and working. Watching GPS time, Spectracoms
and Truetime clocks all tick at the same time while listening to WWV.
exactly as they should. Now I have a alternate for wall clocks should WWVB
be
Mark
OK I did indeed find what you suggested pretty neat most likely will order
one and see whats what.
That certainly simplifies old 60 KHz and in fact may be traceable. Pretty
amazing.
On Wed, Aug 29, 2018 at 11:39 AM, paul swed wrote:
> Mark I looked at the 7 and the pulse out wasn't
Hi
Even when dividing from 48 MHz straight to 60 KHz, the uBlox is going to do
a pulse drop / pulse add to keep things on frequency. For a wall clock that
probably
is not an issue. For a phase locking receiver it’s not quite as clear. The 60
KHz
edge is going to hop by about 21 ns every so
The Ublox 7 has two programmable "timepulse" outputs. The default freqs are (I
think) 1 PPS and 10 MHz.I don't remember if the Ublox 6 has one or two
outputs... also some of the earlier Ublox receivers have limits on the range
you can set the output(s) to (like 1 kHz). Lady Heather can
Mark I looked at the 7 and the pulse out wasn't obvious. Indeed at that
cost it would be great if it did produce 60 KHz as it would eliminate the
whole counter chain + power. The chronverter wants GPS data so its a nice
answer.
I have some 6s here so will start with that. Love low power and crazy
Its a LPF and its not effecting anything. Square waves worked fine
actually. But do want to be able to feed an antenna so a bit of filtering
plus the loops stick should do the job.
On Wed, Aug 29, 2018 at 9:16 AM, Bob kb8tq wrote:
> HI
>
> If you are feeding “Time Nuts” gear, a fancy filter on
HI
If you are feeding “Time Nuts” gear, a fancy filter on the output of the
WWVB gizmo may be an issue. Temperature impacts the value of the
components and that value change impacts the phase of the signal….
Bob
> On Aug 28, 2018, at 9:33 PM, paul swed wrote:
>
> LPF filter added 2.2mH choke
Like I mentioned before, get a $10-ish Ublox Neo7 board/antenna off of Ebay,
program one of the Ublox pulse output pins for 60 kHz. Add your favorite
microprocessor to talk to the Ublox and drive the modulator. The Ublox 60kHz
output should be more than accurate and stable enough to do
LPF filter added 2.2mH choke to a .0022uf cap 1K R pretty simple and
anttenuators and isolation to drive up to 4 receivers.
Have not looked at the power amp and loops stick antenna yet. But it really
is time for GPS a neo.
Looking very good.
On Tue, Aug 28, 2018 at 7:29 PM, paul swed wrote:
>
Ed appreciate the details but no intent to generally run a GPSDO in fact
the 5 V @ 50 ma is a serious power pig. The chronverter draws 5 ma. Clearly
the TTL is a heater. Chuckle. I do want to drive the chronverter with GPS
as its designed for.
Whats pretty interesting is you can adjust its offset.
Totally locked up just fine its looking very good. What interesting is the
chronverter actually puts out the correct julien date for the old truetimes.
From this point its time to get a gps unit hooked up to the chronverter and
then filtering and an amplifier to drive a loop stick antenna. Think
; >>> by 5Hz when divided down and out of the lock range. It is interesting
> >> that
> >>> all 3 were of by different amounts but all negative. These are not
> TCXOs.
> >>> A home brew xtal oscillator will not have temperature compensation.
> >>&g
Well tinkering around and have 20 X 13 MHz vectron TCXOs.
I have to say impressive. Ran it from 73-100 degrees. Its starts 40 Hz low
and only moves 5 Hz over the range.
Just my luck no 12 MHz units. Though I do have a number of 9.6 Mhz vectron
and div 160 gets 60 KHz.
They are actually only VTOs
Hi
One of the “interesting” things about the phase modulation on WWVB is that it
does not get converted to
AM (and thus mess things up) in the front end filters of the typical watches
and clocks. The filters also do
not strip off the AM modulation sidebands of the signal. One would *guess*
Tim, there is indeed a consumer clock that uses only the BPSK modulation
on WWVB. It is an "ULTRATOMIC" clock by La Crosse and has available on
Amazon for over a year now. I have two of these clocks. They are
*vastly* more sensitive than the usual "atomic" AM clocks. My actual
experience is
pensation.
>>> So this has presented a bit more of a challenge then hoped for.
>>> Regards
>>> Paul
>>> WB8TSL
>>>
>>>
>>> On Mon, Aug 27, 2018 at 7:29 AM, Mike Feher wrote:
>>>
>>>> Simple error. It is 1.667.
Paul
> > WB8TSL
> >
> >
> > On Mon, Aug 27, 2018 at 7:29 AM, Mike Feher wrote:
> >
> >> Simple error. It is 1.667. 73 - Mike
> >>
> >>
> >>
> >> Mike B. Feher, N4FS
> >>
> >> 89 Arnold Blvd.
> >>
al Message-
>> From: time-nuts On Behalf Of Bob kb8tq
>> Sent: Sunday, August 26, 2018 6:34 PM
>> To: Discussion of precise time and frequency measurement <
>> time-nuts@lists.febo.com>
>> Subject: Re: [time-nuts] WWVB Chronverter update progress
>>
>
ob kb8tq
> Sent: Sunday, August 26, 2018 6:34 PM
> To: Discussion of precise time and frequency measurement <
> time-nuts@lists.febo.com>
> Subject: Re: [time-nuts] WWVB Chronverter update progress
>
>
>
> Hi
>
>
>
> Well …. 1Hz at 60KHz is …. errr … (off to Goo
-nuts] WWVB Chronverter update progress
Hi
Well …. 1Hz at 60KHz is …. errr … (off to Google Calc …) …. 16.67 ppm. That’s a
pretty major lock range for a TCXO. It’s likely > 10X what an OCXO will do.
What the bare crystal in a watch will do … who knows.
Bob
> On Aug 26, 2018, a
Hi
Well …. 1Hz at 60KHz is …. errr … (off to Google Calc …) …. 16.67 ppm. That’s
a pretty major lock range for a TCXO. It’s likely > 10X what an OCXO will do.
What the
bare crystal in a watch will do … who knows.
Bob
> On Aug 26, 2018, at 5:52 PM, paul swed wrote:
>
> Looks like the signal
Looks like the signal has to be with in 1 hz. I new it was tight.
Need a bit more experimentation across the several receivers though they
all use the same approach with a sharp Xtal filter.
On Sat, Aug 25, 2018 at 8:24 PM, paul swed wrote:
> My mistake the chronverter uses a pic 12f1840.
>
>
My mistake the chronverter uses a pic 12f1840.
On Sat, Aug 25, 2018 at 8:23 PM, paul swed wrote:
> Have to look at what oscillators and crystals I have then a divide.
> Thats old style and most likely the junk box has everything.
> Have to look in my box of tricks as I built several chains for
Have to look at what oscillators and crystals I have then a divide.
Thats old style and most likely the junk box has everything.
Have to look in my box of tricks as I built several chains for the
de-psk-er experiments.
Have to agree on the micro the chronverter uses a pIC 12F64 as I recall and
it
Bob The generator sig is 60 Khz sinewave.but as a I build up a divider
chain and such your idea makes great sense.
Then filter to 60 KHz.
But I see the issue with the Chronverter carrier its 120-150 Hz high.
Bounces around a fair amount.
There could be a secondary issue in that the carrier may not
Hi
You can do the 14 db deep modulation with a tristate gate and a pair of
resistors.
Ground the input and feed the “modulation” signal to the tristate control.
Bob
> On Aug 25, 2018, at 4:35 PM, paul swed wrote:
>
> From the earlier threads OOK modulation does not work for high end clocks
>From the earlier threads OOK modulation does not work for high end clocks
like spectracoms and truetimes. Have not tried it on the cheapy clocks yet.
I added an external modulator. A dg419 analog switch and then with a few
resistors added DC offset and anttenuation so that the carrier drops by
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