[evlatests] current 3-bit sampler incarnation status

[Keith Morris]

We don't know for sure, but we suspect cable/connector variations among
the antennas.  In any case, a 3dB discrepancy is easier for us to explain
than an 11dB discrepancy.

>
> 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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