[time-nuts] Thunderbolt SV and AMU Signal levels

[Chris Kuethe]

On Tue, Jul 22, 2008 at 4:14 PM, David Ackrill <dave.g0dja at tiscali.co.uk> wrote:
> Sorry to be a bore, but like any kid with a new toy I'm facinated by the
> changing values on the display...
>
> What do the values under SV and AMU mean?

SV = space vehicle. mostly irrelevant, unless you care about the
serial number of the bit of metal up there. Usually people mean to say
PRN, or Pseudo-Random Noise code number - one of the 32 codes
transmitted by the satellite.

AMU is Amplitude Measurement Unit. Trimble's signal strength measurement.

> Maybe I should recognise them from other GPS satellite days, but they
> don't seem to be values that I remember.
>
> I'm sure it all means that they are to the north, south, east or west of
> here and to do with signal strength to my location or how good, or bad,
> the lock to the satellites is..  But, nothing that I can remember, to be
> honest...

You're thinking of azimuth and elevation.

> The 10MHz output seems, as far as my old Multifunction Counter is
> concerned, to be to 10.00000MHz within +/-0.00001 MHz.
>
> The display showing 10.00003 to 10.00004 MHz all evening.
>
> So, my guess is that my poor old counter is +/- 10Hz out, but that may
> be due to the age and non-calibration of my frequency counter over the
> years.
>
> Or... The Thunderbolt 10MHz output is moving up and down by 0.00001 MHz
> within a 10MHz band.
>
> This is where I start to get to grips with the spectrum analyser that a
> friend of mine lent to me.  I hope...
>
> Dave (G0DJA)
>
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-- 
GDB has a 'break' feature; why doesn't it have 'fix' too?