[time-nuts] WWVB Chronverter update progress

[Bob kb8tq]

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 often. If the TCXO is running at ~0.1 ppm 
high or low, it’ll do it around 5 times a second. If the newer parts run both edges or
a higher counter drive frequency, you would get more steps per second, but smaller
steps.

Bob

> On Aug 29, 2018, at 3:42 PM, Mark Sims <holrum at hotmail.com> wrote:
> 
> 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 program the outputs (start up with /rxu to force Ublox binary mode).  The pulse output control commands are in the "P" menu.
> 
> You may have to bodge a wire onto the Ublox module to get access to timepulse2 on those cheap Ublox7 boards.  I bought a couple that brought TP2 out to a pad.
> 
> --------------
> 
>> Mark I looked at the 7 and the pulse out wasn't obvious
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