[hpsdr] Trimble Thunderbolt & Excalibur

[Chris Smith]

Hi Tom

I wasn't aware of that list. I'll give it a try.

Many thanks.

Chris
G4NUX


On 19 Apr 2010, at 14:20, Tom Holmes, N8ZM wrote:

> HI Chris...
> 
> If you are not already familiar with it, there is a list like this one
> called time-nuts, a bunch of folks who are really into time and frequency
> measurements. There are several on that list who will be able to tell you
> more than you'd ever want to know about the T-bolt.
> 
> You can subscribe at time-nuts at febo.com.  They generally won't know about
> HPSDR, but your fundamental questions about the T-bolt will get responses
> for sure.
> 
> Regards,
> 
> Tom Holmes, N8ZM
> Tipp City, OH
> EM79xx
> -----Original Message-----
> From: hpsdr-bounces at lists.openhpsdr.org
> [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Chris Smith
> Sent: Monday, April 19, 2010 9:01 AM
> To: HPSDR Reflector
> Subject: [hpsdr] Trimble Thunderbolt & Excalibur
> 
> ***** 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   
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help:
> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
> 
> 


 1271695323.0