[evlatests] antenna 4 works, conditionally

[Jim Jackson]

The heartbeat to the MIB's in the two L302 synthesizers is indeed 
missing.  All other modules with the heartbeat connected seem to see 
it but these two modules do not. This will almost certainly prevent 
Walsh switching from working properly.

The L305 in this antenna is also having difficulties synchronizing, 
though it eventually does if we are persistent.

L-Band shows no sync detect on RCP (IF's A & B) though total power 
looks ok. LCP looks fine.

Do to high winds, we were unable to get on the antenna to 
troubleshoot further.Hopefully we will get on the antenna tomorrow to 
look into  these problems.

Jim

At 04:46 PM 2/13/2008, you wrote:
>The antenna was declared to work today.  In short it does.
>It points to about the right place and the subreflector seems
>to be set right.
>
>the problem is it works only when phase switching is suppressed.
>There must still be some timing to sort out or, perhaps, the
>heartbeat needed at the L302 is not present.
>
>In addition at X band T_cal/T_sys is very large, about 0.13.
>At L band there is no detectable noise tube signal in RCP.
>Q band has not been examined at all.
>
>The antenna will be left secure overnight.
>
>_______________________________________________
>evlatests mailing list
>evlatests at listmgr.cv.nrao.edu
>http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests