[evlatests] S band default frequencies

[David Harland]

I don't know how much it matters for the hardware config portion of the 
OPT, since users are expected to choose their own frequencies, but we do 
start w/ defaults & it would make sense to pick the same ones as are 
picked elsewhere. Right now i think for each band we default to the 
center of the nominal range of the bands. This is what i found using 
webtest <https://webtest.aoc.nrao.edu/rct>:

4 73.75MHz

P 320.25MHz

L 1.6GHz

S 3.0

C 6.0

X 10.0

Ku 15.0

K 22.25

Ka 33.25

Q 45.0

If anyone wants these adjusted, let me know the value to use for a 
particular band. Right now we use the same default frequency for IFs AC 
and BD. If that should not be the case, let me know the default freqs by 
band and IF.

David


Ken Sowinski wrote:
> The satellite radio signals at 2300 MHz are strong ebough in LCP to
> seriously distort the attenuator settings in the down converters such
> that power as seen at the VLA T5s is much too low.  To avoid this
> I suggest moving the default S band frequencies for use with the
> old correlator from 3000 and 3050 MHz to 3500 and 3550 MHz.  This
> will move 2300 MHz out of the downconverter input filter bandpass.
>
> I can change the default frequencies in the parameters DB, but does
> anything else (such as obs2script) need to be changed as well?
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