In a message dated 22/11/2009 21:23:49 GMT Standard Time, [email protected] 
 writes:

AMU and  SNR are two different scales. I do not have a translation. A
Kepler award  recepient once explained Trimbles AMU as "a meaningless
unit". That said,  SNR or C/N0 values cannot be directly compared between
different receivers  since the measures might be taken at different points
in the  receiver.

The Trimble monitor program can be made to switch between AMU  and SNR in
one of the configuration menues. I think you might have switched  to SNR.


----------------------
Ah, that explains it, I wasn't aware there were two options but you're  
quite right.
 
I don't recall switching it, and Thunderbolt Monitor doesn't seem to have  
the option to switch it anyway, but I found the option in GPSMon 1v05  and 
1v6 and it can indeed be toggled.
Whereas GPSMon changes the label of the field to suit it doesn't help that  
Thunderbolt Monitor leaves it described as AMU regardless of the  setting:-)
 
regards
 
Nigel
GM8PZR
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