[evlatests] [evla-sw-discuss] parameter simplification for the VHF receivers

[Bryan Butler]

do they come through different receivers within the box?

i'm concerned about being able to distinguish between them in the SDM.

	-bryan


Ken Sowinski wrote, On 6/27/12 9:30 AM:
> Currently parmainator distinguishes between 75 MHz and 300 MHz for
> band related paramters.  The parameters of interest are subreflector
> rotation and focus and band-dependent delays.  Also there are T_cals,
> which are now obsolete in the paramters DB, and tables of attenuator
> settings, also obsolete.
>
> I suggest that we have only one band code "VHF" to select the low
> frequency receivers.  Receiver.java will transform any reference
> to "75MHz" or "300MHz" to "VHF".  This allows us to keep only
> one set of parameters in the DB, rather than two identical sets;
> prevents possible mistakes when two sets are maintains; more
> accurately reflects the current hardware; and, eliminates the confusing
> necessity of having to know whether the script selected "75MHz" or
> "300MHz".
>
> The rational is that there is one receiver box containing all
> receivers.  Its single output (dual polarization) is conneted
> to one T301 input.  Regardless of which band is selected, the
> hardware configuration is the same and the same wideband signal
> is presented to the T304.
>
> Would doing this prevent anything that would be practical and useful
> with the current scheme?
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