[evlatests] A curious new birdie at X-band

[Ken Sowinski]

On Tue, 23 Jul 2013, Rick Perley wrote:

>    As part of the 'receiver rotation' experiment, I've taken wideband
> data covering all of L, S, C, and X bands.
>
>    Looking at the higher half of X-band (10 to 12 GHz), one, and only
> one, piece of RFI is seen.  It's a pure tone, at
>
>    10750 MHz
>
>    This is not a harmonic of 128 MHz (but is close -- the 84th harmonic
> is 10752 MHz).  No other birdies are seen, so this tone is definitely
> special.
>
>    And it's only seen on antennas near the center of the array --
> strongly arguing for a local origin.

Tha last time you saw this it was coming from the LO of the new API
equipment.