[evlatests] BD T304 power meters and attenuators

[Barry Clark]

I'd incline to make LoIfSetup default to SETANDREMEMBER for 8 bits
and SETLEVEL for three bits for all basebands, and OPT could just
not set things unless there's some special reason to change.

Ken Sowinski wrote:
> Rob has told me that power meters are now available in all T304s.
> This raises the question of what to make the default attenuator
> setting algorithm for IFs B and D.  I would like to make the
> ALC at scan change the default and no longer maintain the BD
> attenuator settings in parminator.
> 
> Some considerations.
> 
> OPT generated script would have to set the BD T304s to use
> set-and-remember whenever it does so for AC.
> 
> Both IF pairs will now be reasonably set regardless of tuning
> within a band.
> 
> We will have to use this, probably without set-and-remember,
> for the three bit samplers.
> 
> Use of ALC modes will force us to understand how the attenuators
> modify bandpasses.  If set-and-rememeber is used too avoid
> attenuator changes, the details when multiple tunings within a band
> are used can be messy.
> 
> When eight bit samplers are used it can be argues that the best
> approach might be to set all the attenuators from a table of
> values.  There might be some merit to this at L band where
> interfence can make ALC operation unreliable.
> 
> 
> I argue we make ALC the default and allow the ovserver to choose
> different strategies in the OPT based on the particular scenario
> for that observation.  Someone will have to invent a few probable
> and useful scenarios.
> 
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