[evlatests] 1408 Birdie -- GONE (mostly)

[Jim Jackson]

 From various discussions this morning, it looks like some form of 
filtering is in order on either the output of the L301 or the LO 
input to the T302 to fix this birdie problem.   Based on a price we 
have for a similar filter in the L300, the cost for this would likely 
be in the ballpark of $30-40K. I spoke with Rick about getting a 
sweep done of the system using the WIDAR to see if there are any more 
of these birdies we need to worry about.  It would be best to 
identify as many as possible before we start buying filters.

Jim

At 09:00 AM 7/29/2009, Rick Perley wrote:
>     All:
>
>     Michael took a ton of L-band data last night.  A quick inspection
>shows that the strong 1408 MHz birdie reported on last week is now only
>barely detectable on a few baselines, and is entirely absent from those
>antennas which had filters installed (2, 3, 9, 25).
>     The four antennas with very weak 1408 MHz birdies are:  1, 4, 18,
>and 28.
>
>
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