[time-nuts] FTS125 GPS Module

[ExpertEngineer]

Hello,

Has anyone had a play with the FTS125 GPS reference from Connor Winfield.

I have one question on it.

I notice if the unit is locked to GPS and the antenna is removed, the unit goes 
to holdover which is correct.

If the antenna is replaced quickly (within minutes) then the module changes 
back from holdover to GPS lock, which is what I would expect.

However, if the antenna is left out for hours, then re-connected, the unit 
never goes back to GPS locked and remains in holdover, this despite 8 or more 
satellites being received.

I have tested multiple boards and they all do this.  This is on the CTV TXCO 
version.  I haven't tested the COO version yet.

Anyone else seen this.  Any fax?

Best Regards
 
Martyn
 
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[time-nuts] 50:50 duty from a PRS10

[ExpertEngineer]

Hello,

I have a PRS10 rubidium which gives a 1pps output.  The output is a 10 us 
positive pulse.


I need to convert that to a 50:50 duty cycle pulse.  Still 1pps.

I'm hoping for a simple circuit rather than having to use a pic.

I don't mind a bit of propagation delay, but I need to preserve the low 
jitter on the rising edge, and hopefully also the falling edge.


Any ideas out there

Regards

Steve


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