[time-nuts] Lucent RTGm-II-XO Slow Acquisition

Tom Knox actast at hotmail.com
Tue Aug 28 01:33:14 EDT 2012


Hi Jerry ;
I assume you mean RFTGm-II-XO. The cell sites usually had an Andrew 26dB antenna with a real short coax run. They also had a 40dB antenna option if needed. Unless you have a long coax run the Symmetricom ant should be ideal.  I don't think the RFTGm-II-XO lock as quickly the Thundebolt but yours sounds like something is not right. Does the software allow you to set mask angle and PDOP? It could be set to high and be ignoring Sats. It also could possibly be set for a past fixed location.  I have a few RFTGm-II-XO/RFTGm-II-RB combos but have never played with the software.  Where did you find your software? And do you have a manual?
Thanks;
Thomas Knox



> From: jsternmd at att.net
> To: time-nuts at febo.com
> Date: Tue, 28 Aug 2012 00:28:27 -0400
> Subject: [time-nuts] Lucent RTGm-II-XO Slow Acquisition
> 
> I have a RTGm-II-XO and it takes quite some time to acquire the minimum 4
> satellites.  Using the same Symmetricom antenna with my Thunderbolt, it
> acquires 6-8 satellites in 15-20 mins while the RTGm-II-XO takes 60 minutes
> and sometimes much longer where I have power cycled it to get it out of
> warm-up.  On power-up, the red alarm goes off within 15mins as programmed.
> I have preset my GPS coordinates using the RS-422 interface and Lucent
> software and set the coax length as well. The antenna voltage is correct at
> 4.9vdc and the antenna is drawing about 25 ma.  The Lucent software shows
> correct XO voltages per the manual.  Any advice appreciated. 
>  
> jerry
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