[evlatests] current 3-bit sampler incarnation status
Bryan Butler
bbutler at nrao.edu
Wed Jun 1 23:07:23 EDT 2011
so why is it 10 dB instead of the 7 that mike measured on the bench?
-bryan
Ken Sowinski wrote, On 6/1/11 17:13 PM:
> Three-bit sampelrs were again installed in the usual antennas
> today: ea12, ea15, ea22 and ea28. A first sanity check was
> made using a K band script.
>
> the sampler in ea12 had to be reset before it looked reasonable.
> The inputs to the sampler in ea28 are swapped. The range of
> input power required to achieve the niminal sampler RMS is now
> 10 dB.
>
> The table below documents the power required for each
> sampler using the script K3bit. Column A is antenna/IF, B are
> the required input and output attenuator settings, C is the output
> power in dBm, D is the sampler RMS.
>
> A B C D
> ea12A 11/19 -20.2 1.55
> C 17/16 -22.9 1.56
> ea15A 11/20 -23.7 1.55
> C 12/22 -25.0 1.59
> ea22A 14/9 -15.2 1.60
> C 11/12 -17.1 1.56
> ea28A 11/18 -20.9 1.64
> C 15/15 -19.2 1.65
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