[time-nuts] Segal law: freq difference for GPSDO
Vlad
time at patoka.org
Thu Apr 28 15:03:56 UTC 2016
Here is an update:
As I manually put the position for StarLoc II (Using Thunderbolt
monitor), things has greatly improving and I am getting nice 10Mhz/1PPS
signals from it. All the metrics on Thunderbolt monitor became "green".
I tried to leave StarLoc II for free run for a day. But even after that
it didn't pickup the coordinates for some uncertain reason. I tried to
replace Motorola Oncore GPS module by newer R5122U1154, but there was no
difference( after one day it still shows 0,0 for its position). I did
factory resets and restart Self-Survey. No luck. Only if I put the
position manually its start to act properly. I am not sure if its a
feature or its bad setup. As I mentioned before T-Bolt and StarLocII
connected to the same Distribution Amplifier and use the same GPS
Antenna. T-Bolt picking up position relatively fast. But StarLoc II
somehow not doing it.
Now I am thinking, it could be not big deal to specify that position
manually (copy/paste from T-Bolt). However, it will be nice to keep that
information even if power was disconnected. Then next time the position
will be available and not need to be specified. As I understood, UT
Oncore modules has battery pin (and it is Pin1 on those 10-pin
connectors). I am curious if it will works just to solder some basic 3V
battery to it ? Thanks !
Regards,
Vlad
On 2016-03-30 13:38, Vlad wrote:
> TB has three satellites in "green" state. I'll have a look to the
> issue closely. Looks like "StarLoc II" little "deaf" in compare with
> TB.
> If its not locked - it could explain why OCXO is out of its 10Mhz. Its
> just not disciplined.
>
>
>
> On 2016-03-30 10:48, Chris Caudle wrote:
>> On Wed, March 30, 2016 12:04 am, Vlad wrote:
>>> https://www.patoka.ca/OCXO/TBvsSL/StarLocIImonitor.png
>>
>> That unit is in holdover, it will not produce an accurate 10MHz
>> output.
>> Only one satellite is in view, so either it does not have a good
>> connection to an antenna, or the receiver is broken.
>> How many usable satellites does the Thunderbolt show?
--
WBW,
V.P.
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