[time-nuts] Segal law: freq difference for GPSDO

[Vlad]

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.