[evlatests] Super-Birdie!

[Ken Sowinski]

On Thu, 17 Mar 2011, Rick Perley wrote:

>    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.

For this tuning the l301-1 was set to 14720, the second harmonic
of which is 29440.  I leave it to others to find out how (or if)
it gets into the signal path.