[time-nuts] ADEV query Timelab and TICC
Dave Martindale
dave.martindale at gmail.com
Mon Mar 20 09:18:58 EDT 2017
The LTE-Lite User Manual (version 1.3) says:
2.3.7 1 PPS Module outputs
The LTE-Lite SMT Module provides GPS raw 1 PPS CMOS pulse on pin 15 with
sawtooth present, and a clean TCXO-generated, sawtooth-removed, UTC(GPS)
phase-locked 1PPS output on pin 4.
It is the pin 4 output that connects to the 1PPS-OUT jack on the eval
board. So it is supposed to be cleanly divided down from the TCXO. (But I
don't think Jackson Labs has published any of the circuitry on the LTE-Lite
module itself).
- Dave
On Mon, Mar 20, 2017 at 2:07 AM, Mark Sims <holrum at hotmail.com> wrote:
>
> It is also interesting that the LTE GPSDO 1PPS has such a wide range of
> TIE. A Tbolt / Z38xx GPSDO typically has a TIE in the 1PPS signal of
> around 1 nsec. The LTE TIE spans over 40 nanoseconds (not including the
> spikes). It seems like the LTE 1PPS may be from the GPS and not derived
> from dividing down the disciplined oscillator output.
> _______________________________________________
>
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