A closer look at the Leo Bodnar LBE-1420 and the precision GPSDO

[Wim13]

With one clock you know the time, but with two clock's....

I have two rubidium clock generators, and a leo bodnar LBE-1420 GPSDO
and a leo bodnar two ports precision GPSDO.

See inside pictures from the LBE-1420 and the precision.

The LBE runs on a ublox M10050KB, an low power ublox M10 and the precision has a ublox M8

The LBE-1420 recieve GPS, Galileo, and Beidou.
I have no info on the precision, only the calculation figures, for different outputs.

The LBE 1420 is very flexible on the output freq. this unit  does have NMEA serial port.
The precision has no NMEA, but there is a topic in which Leo wrote that future update will have.

I did not test U-center, because seems you need version 2 for M10.
On the precision version there is no serial port, just only HID inteface.

Be aware that the Ublox has power protection on the antenne output,
if you use by accident a shorted coax cable the power will be shut down, and poor reception is the case.
Your are lucky if auto recovery is switched on.


So i decided to do a performance test.....

on the scoop, 200Mhz Rigol, channel A the precision and on channel B the LBE-1420. and the Rubidium as trigger.
All on 10 Mhz. The rubidium was not locked to any gps, but was on for hours.

Both units has there own antenna, i have no splitter, not very mutch the same sky view,
i live in a city, and its not easy to put antennes anywhere. Recieves lots and lots of sats


For me there was a surprise view, the LBE-1420 moves left and the precision moves to the right on the scoop screen.
I was expecting two gps signals who moves in the same direction.


The movement from each other away was 60 nsec per hour...all day long.
I can not tell which GPS was the correct one....

Each GPS walked 30 nSec an hour away from each, from the middle of the trigger,
seems to be that the rubidium was exact in between, for the measurement makes
the rubidium no difference, because it effects both units in the same direction.

So 30 nSec in hour is about 8 picoSec/sec, an offset of  8 E-12

The performance of both is the same, i measured no differences, even the Std dev on the measured values was the same.

I think i need a third GPSDO......