[time-nuts] No GPS satellites

Mike Cook michael.cook at sfr.fr
Thu Feb 26 07:27:35 EST 2015


Just a heads up as I stumbled on an interesting XL-DC plugin module for sale on ebay  while looking for info for Doug.
TrueTime Symmetricom XL-DC FTM-III AC Line Frequency Measurement & Time Monitor

Unfortunately I don’t have an XL-DC, but it looks just just the tick for a time nut who has. 


"Ceux qui sont prêts à abandonner une liberté essentielle pour obtenir une petite et provisoire sécurité, ne méritent ni liberté ni sécurité."
Benjimin Franklin

> Le 25 févr. 2015 à 20:35, Doug Ronald <doug at dougronald.com> a écrit :
> 
> I'm hoping someone can shed some light on my problem receiving any GPS satellites.
> 
> I have two TrueTime GPS Time & Frequency Receivers, Model XL-DC. One has a regular crystal oscillator, and the other one has a rubidium oscillator. I have two outdoor GPS antennas with internal LNAs, one a 28 dB gain unit, and the other a 40 dB unit. When either antenna is connected to my Lucent KS-24361, it locks right up and tracks up to 8 satellites. When either of the antennas is connected to the XL-DCs, they just sit there and status : "Looking for GPS satellites".
> 
> In the Alarm menu of either XL-DC there is an alarm for Antenna. Both units say "OK" and if I disconnect the antenna they both logically say "Open". So, what is the problem? I can't believe I don't have enough signal, after the Lucent locks-up right away. Is it possible the TrueTime sanctioned antenna has a down converter in it, perhaps placing the GPS signal from L-band to some lower frequency? I would appreciate any info the group might have...
> 
> -Doug Ronald
> W6DSR
> 
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