[time-nuts] Trimble Thunderbolt - Receive Sensistivity

John Miles jmiles at pop.net
Thu Aug 28 22:48:54 EDT 2008

The elevation mask might also come into play.  Ordinarily you don't want to
consider input from satellites too near the horizon, as terrestrial features
can distort the signal's timing.

I think it can be stated with confidence that there's nothing wrong with a
(normally functioning) Thunderbolt's sensitivity specs, and that putting
random amplifiers, splitters, and such into the antenna lead might be

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of J. L. Trantham
> Sent: Thursday, August 28, 2008 7:39 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Trimble Thunderbolt - Receive Sensistivity
> When I compared the function of the Thunderbolt to my Z3816A, the
> number of
> tracked satellites was smaller on the Thunderbolt.  However, the Signal
> Level Mask is set to 4.0 on the Thunderbolt.  After I reset it to
> 1.0, they
> tracked the same (and number of) satellites.
> This I did with TBoltMon under 'Setup', 'GPS Receiver' which takes you to
> 'Receiver Configuration'.  Change the Signal Level Mask (AMU) to
> the desired
> number then 'Set Receiver'.  I also hit 'Save Segment' though I
> do not know
> if this is a required step.
> Joe

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