[evlatests] L-band Sensitivity, cont.

[Mike Revnell]

Attached are some 'baseband' spectra from the EVLA antennas from Monday 
morning when the antennas were setup for L band. The plots are across the
1GHz band with approximately 2MHz frequency resolution. The part that ends 
up in the VLA correlator would be 50 MHz near the 1200 MHz tic.

These are typical of what I see when the antennas are setup for L band.

Antenna 13 is particularly pathological. In this case IFs AC had no 
digitizer input power from the downconverter.

Antennas 14 and 16 are the best but still show about 15 dB across the 
band.

Antenna 18C was missing its DTS module at the time. The noise generated by 
the deformatter in this situation depressed the plot scale somewhat.

Antenna 24 had no power in any IF at the time. (no L band in the antenna?)

Mike Revnell
National Radio Astronomy Observatory
Socorro, New Mexico
mrevnell at nrao.edu
revnell at ieee.org
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