[evlatests] 84th harmonic question

[Keith Morris]

Rick:

The first LO for the API (both old and new) is 10750MHz.  Do you notice
the birdie stronger towards the center of the array, or on the east arm?

Shielded chamber tests of the new API LNBs didn't show any emissions at
the LO frequency, though there was radiation at certain subharmonics,
which we have found a way to suppress.




>     I've found a birdie at 10752 MHz in the flux data.  In reviewing the
> 'spectral sweep' tests, I see the same birdie.  It turns out to be the
> 84th harmonic of 128 MHz.  No other harmonics of 128 MHz are obviously
> present in X-band.  Can anybody explain why this harmonic turns out to
> be relatively strong?
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