[evlatests] LO issues, various

Eric Chavez echavez at nrao.edu
Fri Oct 10 13:38:01 EDT 2014


Vivek,

Dave Parker found a loose SMA connection in the LO Rack. This is likely 
the cause of problem #1. The Antenna lost sync during troubleshooting, 
but I perform all resets. It will need delays set again.

Terry Cotter is aware of problem #2.

Thanks,

Eric

On 10/10/2014 10:52 AM, Vivek Dhawan wrote:
> After antenna moves and pointing, the following were noticed:
>
> 1. ea25 phase changes a lot when the antenna goes over the top -
>     all IFs and bands show it, so probably the LO reference fiber
>     or related cable is flopping about. We have seen similar things
>     on other antennas.
>
> 2. L302 (non) return-to-phase - that pesky 128MHz cable / 20Hz synch.
>
>     ea01, L302-2, L302-3.
>     ea02, L302-2.
>     ea10, L302-2.
>
>     all antennas good with L302-1 and L302-4.
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.nrao.edu
> https://listmgr.nrao.edu/mailman/listinfo/evlatests



More information about the evlatests mailing list