[evlatests] L-Band Switched Power Issues

[Rick Perley]

    Some problems with switched power specific to L-band are noted:

    Antenna 9 has no detectable PDif in any IF!  This presumably means 
that the noise diode is not actually contributing any power.  And, if 
memory serves me well, this has been the situation for a long time. 

    Antenna 28 has a completely trashed PDif in LCP only.  Values are 
wild and variable -- they don't reflect reality and cannot be used.  But 
RCP is fine. 

    Antenna 18, in RCP, is also very noisy in PDif and PSum. 

    All other antennas seem fine.