[evlatests] 3-bit setup recommendations

[Barry Clark]

Actually, specifying a setup time and a percentage would be a better
way to handle all our observing, correctly steering people away from
too short SBs.

Bryan Butler wrote:
> for everything else, we specify the overheads as percentages, not in the 
> detailed way you have set out below (for number 2).
> 
> can you recommend a simple extra percentage, as baseline?  (10% might be 
> OK?)
> 
> 	-bryan
> 
> 
> Rick Perley wrote, On 7/10/12 14:09 :
>>      After some discussion with Ken and Vivek, the agreed overheads for
>> setting up to observe with the 3-bit samplers are:
>>
>>      1) Three minutes at the beginning of any SB, to allow the antennas
>> to slew to ~30 degrees, where the T304 attenuators will be set.  The
>> argument here is that we have yet to establish the power range over
>> which the attenuators should be reset (probably 1dB is too fine, and 2dB
>> might be about right.  If so, then setting the levels at/near 30 degrees
>> will suffice for nearly all bands and elevations).
>>      2) Two more minutes for every LO tuning.  For most initial 3-bit
>> observing (certainly for wide-band continuum, and wide-band spectral
>> line searches), there should be only a single LO tuning per band.
>>
>>      We think this is sufficiently general, and cautious.
>>
>>      If there are counter-arguments, we need to hear them soon!
>>
>>      Rick
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