[evlatests] ea04 broken at K and Ka bands

Jim Jackson jjackson at nrao.edu
Fri May 30 13:50:25 EDT 2008


I just looked at this.  The band switches in the UX converter are not 
responding to commands so it is essentially stuck in Q-band (the 
default).  Someone needs to write it up as a failure and it will be 
looked at early next week.

Jim

At 11:41 AM 5/30/2008, Ken Sowinski wrote:
>I spent much of the morning trying to make antenna 4 work at Ka band
>again, only to find that both K and Ka bands do not work.  Q band is
>fine, as are L, C and X.
>
>It can't be an L301 because Q band and Ka band use the same
>L301-1 frequency when tuned to the same sky frequency.
>
>It can't be a broken signal path because the sun is seen at
>both K and Ka bands.
>
>I don't know what that leaves, but is is clear that K and Ka
>band is now incoherent even though we are seeing noise power in
>the downcoverters as expected.
>
>Did anything happen to the antenna when it was moved?
>
>
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