[evlatests] Alerts for T304 TPD levels

[Chuck Kutz]

Somehow we are going to have to come to grips with working in a contiguous
RF environment. 

This solution has the possibility of generating a lot of write ups that
someone will have to spend time on. 
The system as currently implemented, is "fooled" by spurious RF signals that
affect the level set which is based upon the total energy observed in a 1GHz
wide RF environment. 

There may be other ways to handle this. I have a couple of ideas. Anyone
interested?


Chuck

-----Original Message-----
From: evlatests-bounces at nrao.edu [mailto:evlatests-bounces at nrao.edu] On
Behalf Of Keith Morris
Sent: Tuesday, April 05, 2011 8:12 AM
To: Steven Durand
Cc: evlatests at aoc.nrao.edu
Subject: Re: [evlatests] Alerts for T304 TPD levels

There is certainly the possibility of false alarm, but the cost of such 
an alarm is quite low.  The TPD monitor point message field reports the 
ALC status-- target reached, attenuator out of range, etc.  The alert 
would inform the operator that such a situation exists; there may or may 
not be any action the operator can take.  But in the cases where the 
attenuators failed to set up properly, the benefit of having a second 
chance of dialing in proper levels may outweigh the inconvenience of 
false alarms.



Steven Durand wrote:
> Is there the possibility of many false alarms.  The x-band 
> receivers still have very low output.  Also at the edges of each 
> band some of the receivers have low output that can not be 
> adjusted to the proper level.
> 
> 
> 
> Rob Long wrote:
>> I discovered several T304 attenuators set incorrectly (again) this 
>> morning. I wonder if we should setup alert levels on the TPD monitor 
>> points in order to warn operators of a potential ALC problem. If the 
>> operators knew of the problem, they might have been able to take 
>> corrective action.
>>
>> I spoke with Dave who informed me that they didn't even realize the 
>> attenuators were set incorrectly because they saw no fringe problems. 
>> This email is effectively a channel to open communication concerning 
>> ideas/solutions to this problem!
>>
>> Thanks,
>> Rob Long
>>
>> _______________________________________________
>> evlatests mailing list
>> evlatests at listmgr.cv.nrao.edu
>> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests
> 

-- 
Keith Morris
National Radio Astronomy Observatory
1003 Lopezville Rd.
Socorro, NM 87801
575-835-7060 (phone)
575-835-7027 (fax)

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