[evlatests] A curiosity with antenna 12

[Hichem Ben Frej]

We run a utility that collects the module version for the MIBs and I 
could confirm that, now, all M301, except 07, 14 & 16 (no response), 
have the same software version.

Thanks,

--Hichem

Joseph P. McMullin wrote:
> Jim, Hichem,
> 
> Is it possible to poll the versions of the M301 firmware on the other 
> antennas and confirm that
> they are consistent (rather than empirically determining this).
> Similarly, given Hichem's last note, can we review the M301 MIBs for 
> surprises.
> 
> Joe
> 
> On Wed, Jun 30, 2010 at 5:18 PM, Jim Jackson <jjackson at nrao.edu 
> <mailto:jjackson at nrao.edu>> wrote:
> 
>     Antenna 12's M301 had the wrong version of firmware in it.  It was
>     the version we installed in early April that was pulsing the switches
>     every time a command was received. I don't know why this module
>     didn't update when the rest of them were done on 21 April - possibly
>     the antenna was being worked on and wasn't communicating.  It has now
>     been fixed and has the same firmware as the rest of the M301's.
> 
>     Jim
> 
>     At 04:48 PM 6/29/2010, Ken Sowinski wrote:
>      >On Fri, 25 Jun 2010, Rick Perley wrote:
>      >
>      > >    Michael took a short (27 minute) observation in 2 GHz-wide
>     mode a
>      > > couple days ago.   Eight full-polarization subbands, each of
>     128 MHz
>      > > width, in each of the AC and BD IFs.  In general, beautiful data.
>      > >
>      > >    It was noted that antenna 12 had a curiousity -- once every
>     minute,
>      > > on all subbands, in all polarizations, the amplitude dropped by
>     about
>      > > 10% for a single 1-second record.  This was the only antenna
>     for which
>      > > such a effect was noted.  As the script asked for a new scan every
>      > > minute, I had assumed the 'drop-down' was a first-record, or
>     perhaps
>      > > second-record problem.  It's not!
>      > >
>      > >    This 'drop-down' is a 2nd-record effect -- the 2nd record of
>     every
>      > > scan is low by this much.
>      >
>      >this is still happening.  It is really synchronous with the
>      >the new scan and is happening at the antenna.  The evidence
>      >is that all the T304 power meters show a one or two dB dip
>      >at each scan.  Since it is seen in the input power meter it
>      >must be happening upstream of the downconverters.
>      >
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> 
> 
> 
> -- 
> Dr. Joseph P. McMullin        
> EVLA                            
> Ph: +1 575 835 5700
> E-mail: jmcmulli at nrao.edu <mailto:jmcmulli at nrao.edu>
> http://science.nrao.edu/evla/
> 
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