[evlatests] Ant 24

[Mike Revnell]

Kerry traced the problem with the DTS module removed from ant 24 the other 
day.  It looks like the problem was a cable which caused a whole new 
syndrome not seen before.

The waveform distortions I saw when I looked at it indicated some kind of 
weird jitter in the digitizer clock. The cable in question carries the 
timing signal from a utility board in the module (PSC) to the formatter.

The only theory I can contrive is that the cable problem was causing 
jitter on the 52ms which was then somehow screwing up the formatter logic.


Mike Revnell
National Radio Astronomy Observatory
Socorro, New Mexico
mrevnell at nrao.edu
revnell at ieee.org

On Thu, 27 Jul 2006, Ken Sowinski wrote:

> On Wed, 26 Jul 2006, Rob Long wrote:
>
>> The D303 was swapped out in ant 24 today with a spare.  IF-C should be
>> up and working.
>
> Yes, it now works.  The IF C response is now comparable
> to the other three IFs, clearly implicating the DTS
> module that was removed yesterday.
>
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