[time-nuts] MT3339 chipset in Globaltop's FGPMMOPA6H

[David J Taylor]

Hello, while asking info about the FE5682,
I realized that for another project
(model plane data logging) I will buy
some cheap gps modules built around an
MT3339 chipset.
In my mind somewhere I stored the fact
that in the datasheet of these module
is mentioned the pps output, so I checked
and the manufacturer is claiming that it
has "High accuracy 1-PPS timing support
for Timing Applications (10ns jitter)"

This is the module I'm talking about:
http://www.mirifica.it/store/gps/342-globaltop-fgpmmopa6h-pa6h.html
http://www.alcom.be/binarydata.aspx?type=doc/GTop-FGPMMOPA6H-Datasheet-V0A.pdf

Has anybody used this chipset or similar for GPSDO?
I have no experience with discipled oscillators
but if there is any hope that the pps out
of these modules is good for the task maybe
it's time for me to start reading more about
the subject.
The final goal will be to check the timing
of the Rb I have around.

Thanks,
Fabio.
=========================================

Fabio,

I bought one of these modules to play with, and it does indeed have a 1 PPS 
output.  However, there's no mention of sawtooth correction in the data 
sheet, and its 15 mm square antenna may render it less sensitive tan modules 
with a larger (e.g. 25 mm square) antenna.  This may not matter for outdoor 
applications.  My use is with a Raspberry Pi for NTP, so sub-microsecond 
accuracy is good enough for me.

Ciao,
David
-- 
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk