[time-nuts] AMU vs dBc

Stan, W1LE stanw1le at verizon.net
Tue Nov 24 03:42:09 UTC 2009


Compare 2 each T'Bolts with V3.0 Firmware, all on a common antenna
Set one to read AMU's, set the other to read dBc.

May make a reasonable comparison.

Probably would be best to compare with both set to AMU readings,
then both set for dBc readings, to be sure there is some close agreement.

Then set one to AMU and the other to dBc. Compare/document.

Stan, W1LE     Cape Cod


Mark Sims wrote:
> Alas,  there is no way to get a direct conversion between AMU and dBc.  What you have to do is display the signal levels in dBc and then switch the unit to AMU.  It takes it a couple of seconds before it switches.  By then the signal levels have changed,  so that the data is only approximate.  The lower signal levels seem to change the most so I have been unable to get any reliable/repeatable readings.
>
> Even setting the AMU mask level and watching where sats turn yellow/green does not work well.  There appears to be some hysterisis/filtering/delay in the selection/deselection process.
>
> ----------------
> Can you also see what  0.0, 0.5, 1.0, 1.5, 2.5, 3.0  are equal to.
> Those are the important ones when setting the AMU lower. 		 	   		  
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