[time-nuts] Thunderbolt reception problems

[SAIDJACK at aol.com]

Hi Bjoern,
 
I respectfully disagree. I measured the loss through the GPS amp and Mini  
Circuits splitter at only 10.1dB. That's really not a lot. I couldn't  find 
a loss-spec in the Thunderbolts' specification.
 
The Agilent amp has GPS filters in it that improve signal quality by  
filtering out all non-GPS signals.
 
Someone else had the same problem here (that's how the discussion  
initially started) thinking his Symmetricom splitter was dead. I think it's  safe to 
say a GPSDO can be expected to work with a name-brand GPS splitter  (which 
it did not either for the other gentleman).
 
So if the M12+, M12M, and all other GPS receivers I have can all handle  
this signal without a hitch, except the Thunderbolt, then this means the  
Thunderbolt requires special attention (or in my case possibly it's own GPS  
antenna).
 
I will try to change the AMU settings as Warren suggested, that makes  
sense. Maybe this is what we should have tried from the beginning to make  our 
Thunderbolts work?
 
bye,
Said
 
 
In a message dated 11/21/2009 14:18:51 Pacific Standard Time,  
bg at lysator.liu.se writes:

Hi  Said,

As we talked about some weeks ago... your test is unfair to the  Tbolt, but
that is perhaps intentional. The Tbolt will need more gain to  work. You
are giving it a signal that is out of  spec.

--

Björn