[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.
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