[email protected] wrote:
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.
The Thunderbolt Monitor does have it, I just ticked the box and had my
C/N measures instead. In the "Setup" menu, select "Packet Masks and
Options..." where you in the "Packer 35 Options" frame, the "Auxiliary
(Byte 3)" sub-frame find a tick-box for "Output dBc/Hz". Tick the
tick-box and press the "Set Options" button and you get dBc/Hz values
rather than AMU values.
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:-)
A bit confusing indeed, but the values should never really overlap, so
values should be a good hint on what to expect.
Bottom line, use C/N values whenever you can.
Cheers,
Magnus
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