[evlatests] Results from Solar Tests of 11 Oct.

[Hichem Ben Frej]

ea10-m301 was updated to the latest M301 software version.

Thanks,

--Hichem

Ken Sowinski wrote:
> On Wed, 12 Oct 2011, Rick Perley wrote:
> 
>>    Perhaps more interesting are some notable exceptions to these results:
>>    a) Antenna 10 showed *no change* in amplitude between the 'in' and
>> 'out' states, at all three bands.  However, the situation is not one of
>> failed commands, or a failed attenuator, since the *phase changed* for
>> every change of state.  So ... something is changing, but that change
>> doesn't affect the signal strength.   This behavior was the same for
>> both polarizations.
> 
> I cannot explain the phase change, but can explain the
> lack of attenuation.  The M301 MIB in ea10 is using old
> software and does not respond to the solar attenuator
> command.  This should be updated today if possible.
> 
>>    b) There were four antennas which shared the behavior of antenna 10,
>> but only for one of the transitions:  At L-band, antennas 14 and 17 each
>> failed to change from the 'in' to the 'out' state once (at a different
>> time for each).   At C-band, antenna 12 failed (once) to change from
>> 'out' to 'in' state, and antenna 7 failed (once) to change from 'in' to
>> 'out'.  For all of these, the phases did change, and the behavior is the
>> same for both polarizations.  In other words, this failure mode is the
>> same as for antenna 10, but occurred much less frequently.
> 
> This must be a different problem.  Perhaps switch failures?
> 
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.cv.nrao.edu
> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests