[evlatests] Super-Birdie!

[Rick Perley]

    I've reported earlier on various 128 MHz combs which show up at some 
bands. 

    There is a 'special birdie' found in the Ka-band spectra, which 
deserves a special note.  This is at
29440 GHz, and is a good 33 dB above the noise!!!  It is so strong that 
satellite wings are seen at +/- 32 and 64 MHz above and below the center 
line.  I note that this tone is the 230th harmonic of 128 MHz. 

    This tone is different than the others, in that there are no other 
tones in adjacent subbands.   Other tones come in families, with the  
odd multiples of 128 MHz being much stronger. 

    The tone is seen on all baselines, but is by far the strongest on 
baselines with 12 and 7 (with the baseline 7 * 12 being by far the 
stronges), and is weak only on baselines with antenna 14.  It is seen in 
both RCP and LCP.