[time-nuts] Thunderbolt initial startup

Ken Winterling wa2lbi at frontiernet.net
Tue May 20 17:04:10 EDT 2008


My original antenna was a mobile GPS unit stuck out the window on a thin
aluminum pole just to get it away from the house.  It worked fine until I
got my "real" antenna installed.  I believe the default is overdetermined
clock mode.  AMU is Amplitude Measurement Unit.  I think the default is 3 or
4 before it locks on the bird.  You can change that but I would use the
defaults until you see how everything works. You may want to change the
clock from GPS to UTC.


On Tue, May 20, 2008 at 4:52 PM, David C. Partridge <
david.partridge at dsl.pipex.com> wrote:

> It's found a whole lot more satellites now - tracking seven!
> Once self survey is complete, should I set to overdetermined clock mode and
> dynamics code stationary?
> Thanks
> Dave
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of David C. Partridge
> Sent: 20 May 2008 21:21
> To: 'Discussion of precise time and frequency measurement'
> Subject: [time-nuts] Thunderbolt initial startup
> I've managed to cobble a serial cable for my TB as I found I had a spare
> DB9M connector and another cable with a DB9F on the other end.
> I'm now looking at tboltmon - it's saying only 1 SV usable and 1% into
> self-survey, I only attached the antenna about 5-10 minutes ago.
> The antenna (car type) is mounted on a small disc of aluminium, and is
> about
> 40ft off the ground and has a reasonable view of the sky though there are
> some trees to the south of me.   Antenna cable is 5mtrs of RG174.??
> It shows a number of satellites with an AMU value (whatever that is) of 0.
> The one it's tracking has an AMU of >15.
> Is this normal as the self-survey starts?  Or do I need a (much) more
> serious antenna (this one claims 28db gain)?
> Regards,
> David Partridge
> Tel: +44 (0)1926 856755
> Mobile: +44 (0)7963 206199
> Email:david.partridge at dsl.pipex.com<Email%3Adavid.partridge at dsl.pipex.com>
> skype:david.partridge

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