[evlatests] P-band receiver stability

[Rick Perley]

     The 30-hour 'flux models/density' run, taken last weekend, gives 
much information on receiver stability.  Here is a short report for P-band.

     In general, receiver stability is extremely good.  Most 
antennas/IFs have constant gain to within 5% over the 30 hour period.  
Most are significant better than this.  (And this without applying the 
switched power).

     The exceptions to this (and some are quite extreme!) are given below:

     For the 'X' polarization (to be more precise, that which is 
labelled as 'X' in the data):

     ea04, ea14 and ea21.  The first is especially bad, with two gain 
states -- one good, the other very bad.  It was in the 'good' state for 
about 6 continuous hours.

     For the 'Y' polarization, the list of misbehaving antennas is longer:

     ea03, ea04, ea12, ea13, ea16, ea19, and ea26.

     ea04 is very very weak most of the time.  ea16 also has two gain 
states, one normal, the other very not.  The rest show significant time 
variable performance -- but sufficiently slow that it can be calibrated.

     I can provide (next week) plots if these are useful.