[evlatests] LOSER for the transition VLA

[Walter Brisken]

By popular demand I have produced "tloser" -- the transition VLA version 
of the popular "LOSER" program which calculates LO settings for the VLA.

tloser will report the L301 and L302 synthesizer settings capable of 
tuning EVLA antennas with the existing VLA correlator as a backend to a 
particular frequency or band.  The program is written in python so can be 
used on Solaris, Linux, and maybe even Windows (but I claim no 
resposbility for the later).  You can view the program as a text file to 
see what it does.  To invoke the program, run

   /home/parallax/bin/tloser

Running with no command line arguments will give instructions which 
specify two usage modes:

Usage(1) : ./tloser <band edge freq [MHz]> 
Usage(2) : ./tloser <center freq [MHz]>/<bandwidth>

And three examples:

Examples

   ./tloser 1439.9
   ./tloser 1464.9/50


Usage(2) will be popular with those who want to center a particular 
frequency within a VLA bandwidth -- the slash (standard filter notation) 
is significant.  All frequencies reported are in MHz.

Please report to me any bugs that are found.


Expect "eloser" as a replacement for "tloser" once we get wideband 
correlator capabilities and graduate from the transition system.


-Walter