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Most EVLA antennas currently in the array (see the table in the relevant section for the current status)
have the new wide-band K-band receivers installed, which can be tuned
outside the traditional VLA K-band range (21.2 - 25.2 GHz). Recent
tests show that meaningful results can be obtained from 18.1 - 26.5
GHz, with a small penalty in performance at the extreme ends, as shown
in this figure, which plots the rms
(in arbitrary units) averaged over the four IFs as a function of
frequency at the band edges. Note that at 18.1 and 18.3 GHz not all
IFs led to a solution. Between these edges, the rms rises linearly
with frequency, with a slope largely determined by the frequency
dependent antenna efficiency.
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National Radio
