[GPS_Standard] Trimble 34310-T oscillator stability?

[Bob Stewart]

Hi Graham and Dave,

What both of you say makes sense.  Now I think on it, I had a UT-41 hooked 
up for awhile (I broke it digging in its innards LOL) and its track 
wandered around the house and occasionally into the neighbor's yard.  
So, perhaps I have a big multi-path problem here with my indoor 
antenna.  I'm going to have to spend some quality time with a calculator to convert distance to time and such to see how much jitter that would 
imply.  Maybe later I can get some N to SMA adapters and run a long 
RG-213 into the back yard to have the antenna in the clear and see what 
difference that makes.

Bob




From: Graham <grahamh at austin.rr.com>
>To: 
>Cc: Bob Stewart <bob at evoria.net>; "gps_standard at mailman.qth.net" <gps_standard at mailman.qth.net> 
>Sent: Monday, July 15, 2013 4:55 PM
>Subject: Re: [GPS_Standard] Trimble 34310-T oscillator stability?
> 
>
>Bob:
>
>The jitter spec on the UT+  is  +/- 80 ns, due to the granularity
>of the clock in the UT+.
>
>You are using an indoor antenna, which means that you are likely listening
>to several of the satellites from reflections from nearby homes, buildings,
>trees, etc.  This introduces distance errors in the received signals that
>continuously changes as the satellites move.
>
>So, without a good outside antenna, clear of reflected signals, you probably
>have much more jitter than the receiver is capable of providing.
>
>So, yes, a dancing control signal is normal.
>
>--- Graham / KE9H
>
>