On 09/20/2017 04:39 PM, John Shields wrote:
So, as a result of moving the Firefly to ...20.2 (red) :
Obs 1) when using query_gpsdo_sensors I occasionally received USRP NOT
locked to 10 MHz Reference but after a retry it finds it OK. I
switched PPS/Ref cables from the Firefly to USRP motherboard and the
issue remained, occasionally, as a 10 MHz issue. I have not seen this
when the Firefly was in 10.2 (blue) but I have not needed to run the
query_gpsdo_sensors very often on this unit.
Obs 2) After, query_gpsdo,sensors confirms lock on red, when I do a
test_pps_input (—source mimo) on blue, I still get no PPS.
As best I can tell, Obs 2) would indicate that the issue is not with
either N200? The only issue might be the MIMO cable? but it is a
robust beast so I would doubt that.
Being a BNR/Nortel pensioner, just buying a new N200 ($kiwi 2500.00)
in the hope that it would change the situation to a pleasant outcome
would appear imprudent. My gut feel is that using the MIMO cable with
N200 is not that common a config and there might be something gnarly
going on?
Kind Regards,
John
The MIMO cable is just a SASI cable as I recall. But, agreed, seems
like the cable is unlikely to have failed.
I'd wait for the unit with the GPSDO in it to achieve solid GPS lock --
it may be that it's not providing reliable PPS until it is locked.
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