From: Darren Dowell [cdd@phobos.caltech.edu]
Sent: Friday, April 23, 2010 4:38 AM
To: Hiroshige Yoshida
Cc: John Vaillancourt; Giles A Novak
Subject: Re: missing some data in SHARC II headers

Thanks, Hiro.

Darren

On Thu, 22 Apr 2010, Hiroshige Yoshida wrote:

> Hi Darren,
>
> I assume the chopper was actually moving (as evidenced by the oscilloscope
> or SHARC II/SHARP data) but the antenna computer was not registering the
> fact (the antenna display indicated either "not chopping" or "0 Hz").
> The solution is to do "ANT /RESTART" from UIP.  I did it this morning
> and verified that correct chopper values were written in the SHARC II
> header.
>
> -HY
>
>>
>> Hi Hiro,
>>
>> I just noticed that tonight we're missing some information which is
>> normally logged in the SHARC II headers.  It's not a major problem,
>> hence I'm not calling at night, but it would be good to find the
>> reason for future nights.
>>
>> Here are the things which are normally nonzero but are zero tonight:
>>
>> CHPFREQ =                  0.0 / Chopper Frequency in Hz
>> CHPTHROW=                  0.0 / Chopper Throw in arcsec
>> CHPLOWIN= 0.0 / Lower window chopper tolerance in arcsec
>> CHPOFFST=                  0.0 / Chopper offset in arcsec
>> AZO_CHOP=                  0.0 / AZimuth Offset, nodding(arcsec)
>>
>> So it seems like things related to chopping.  Do you have any possible
>> explanations and solutions?
>>
>> Thanks,
>>
>> Darren
>