[evlatests] Nov 28 2005, EVLA report

[Ken Sowinski]

An RF filter, center frequency and width unknown to me, was placed
in the RCP signal path for C band in antenna 14.  The intent was to
see what Vivek described as 'jitter in the test meeting this morning
would go away.  It did and was still seen in LCP.  This points to
aliasing occurring in the T304 or the transition module, or not 
presenting a band limited signal to the sampler.  The 'jitter' is 
seen at C and K bands, but not L and X so the problem is not likely
to be in the T302.  Data was taken at X, C and K bands at several
bandwidths and has not yet been examined, however a preliminary look 
reveals that all the 50 MHz X band data is garbage.  No explanation 
is yet available.

After a little while the ACU MIB in antenna 16 died and had to be
reset.