[hpsdr] Trimble Thunderbolt & Excalibur

[Chris Smith]

Hi again

Sorry, I was rather slack in my wording. I didn't connect the PPS signal to Excalibur - only the 10MHz output.

Chris
G4NUX


On 19 Apr 2010, at 14:00, Chris Smith wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi
> 
> I wonder if some kind soul can throw some light on a problem I'm having with my Trimble Thunderbolt please?
> 
> I bought the unit from an outlet in California last November but, due to circumstances, have only just got around to using it with Excalibur. 
> 
> The first thing I noticed was the Temp pane in TBOLTMON shows -30.8C. Jeff Cook G0AFQ sent me a screen capture of his set-up which shows a temp of 36.7C - more like what I would expect to see. TBOLTMON doesn't show any Critical or Minor alarms and the Lat, Long & Alt are all nominal.
> 
> The next thing I checked was the output from the 10MHz osc. The amplitude displays serious jitter of several 10s of mVs.
> 
> The PPS output displays a 10uS pulse at 1 second intervals, so that appears to be working.
> 
> I connected this signal to Excalibur and jumpered for external osc. This is when I became seriously depressed. The phase lock lights alternate red/green at several 10s of Hz. I can only assume that either I have made a serious error in constructing Excalibur or the Thunderbolt output differs from the TXCO on Excalibur by several 10s of Hz.
> 
> I've checked the power rails to the Thunderbolt. All were within a few mV of nominal and clean on a 'scope. So it isn't a problem caused by the power supply.
> 
> Has anyone else seen these problems? Can anyone suggest a cure?
> 
> I'm happy to approach the supplier of the T/B and see if they will exchange the unit but I thought I'd pick a few brains first.
> 
> Cheers
> 
> Chris
> G4NUX   
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