[time-nuts] Oooold GPS receiver discussions Austron 2201 as an xample
paulswedb at gmail.com
Thu Nov 12 09:01:30 EST 2015
Charles I agree with what needs to be looked at first and thats the
downconverter. Its really a starlink GPS receiver that I tapped the RF off
of and upconverted to 75.42 Mhz for the 2201. The startlink is driven and
controlled from the corrected 10 Mhz 2201signal that would have gone to the
It has operated well in the past. The starlink itself is working very well
good S/N etc. So that tends to reduce the possibilities for the issue.
On Wed, Nov 11, 2015 at 9:42 PM, Charles Steinmetz <csteinmetz at yandex.com>
> Paul wrote:
> Indeed the almanac seems to be the problem. I can see what it thinks should
>> be in view. Its not been easy to backout if the satelliets are behind or
>> the future. My time mis-alignment even though the closks correct within 1
>> second and the same for my location accuracy. I can manually tell it to
>> track a satellite and it does. Though even at that it seems to have issues
>> I speculate as poor signal to noise. So may have to do some digging.
> If there is a signal-to-noise problem, it's either the antenna location,
> the antenna, or the front end of the receiver.
> Normally I'd discount the front end entirely and focus on the first two,
> but IIRC you said you home-brewed a down-converter -- so that has to be on
> the table, as well.
> Anyway, fix the S/N problem, then just let it run and it should sort
> itself out.
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