[evlatests] L302 phase noise.

[Vivek Dhawan]

Given 2 spectra one each for the old and new designs,
measured over 10Hz to 1MHz. The new one is worse by over
20dB in the range 1KHz to 100KHz, and worse by about 5dB
at 10Hz (-45 dBc old, -40 dBc new, 10Hz offset from carrier)

The integrated phase noise from 10Hz to 1MHz for each is:
(at 12.8 GHz carrier)

Old: 0.9 deg rms.
New: 3.5 deg rms.

The crucial range from 1Hz to 10Hz was not on these plots, but
Rob Long reports (from another measurement) that the phase noise
was certainly 30dB or more down from carrier. Assuming a
conservative -30dBc for each, and extrapolating in reasonable
fashion from 10Hz to 1Hz, the integrated phase noise 1Hz to 1MHz
is:

Old: 2.5 deg rms.
New: 4.5 deg rms.

No significant loss here, assuming the same spectra are valid
at all times/antennas.

Vivek.