[evlatests] Utility that may be of use to folks

[Walter Brisken]

I have an EVLA "frequency detector" -- logs into various mibs and tries to 
determine the SSLO (for the signal being presented to the sampler), 1 GHz 
band and VLA band.  For example:

parallax<240>% /home/parallax/evla/mibtalk/getfreq ea13 ea14
ea13 IFs A/C : X band
   1 GHz band : 9292.100000 .. 8268.100000
   VLA band : 8460.100000 .. 8510.100000
   L1 = 0.000000  L2 = 11340.100000  SSLO = -9292.100000
ea13 IFs B/D : X band
   1 GHz band : 9342.100000 .. 8318.100000
   VLA band : 8510.100000 .. 8560.100000
   L1 = 0.000000  L2 = 11390.100000  SSLO = -9342.100000
ea14 IFs A/C : Q band
   1 GHz band : 42457.900001 .. 43481.900001
   VLA band : 43289.900001 .. 43339.900001
   L1 = 17792.000000  L2 = 12966.099999  SSLO = 42457.900001
ea14 IFs B/D : Q band
   1 GHz band : 42507.900001 .. 43531.900001
   VLA band : 43339.900001 .. 43389.900001
   L1 = 17792.000000  L2 = 12916.099999  SSLO = 42507.900001


Feel free to use.  Let me know if you find bugs.  I've not tested 4 band 
yet, but it should work given that P seems to.

The freqs listed are all in MHz.  for the 1 GHz band, what is shown is the 
sky frequency corresponding to zero and nyquist frequency of the sampled 
data; the spectral sense is encoded by the ordering of the two freqs.

The version above ( /home/parallax/evla/mibtalk/getfreq ) is compiled for 
Linux.  Code is all in 'C' language and can be easily embedded into other 
programs (as I intend to do with my intern David for his project).

-W