[evlatests] ea20 switched power wrong at X-band

[Keith Morris]

My understanding is that it is useful for plotting when gain, Phot, 
Pcold, and Tcal are overlaid in the same plot.  Bob Hayward 
traditionally did this in Excel, which does not provide a handy way of 
vertically scaling plots.



On 6/18/2013 7:53 AM, Rick Perley wrote:
>      Can somebody remind me why there is a 'Tcal Scaled' column?  What
> use is this?
>
> Barry G. Clark wrote:
>> The problem is that the parser looks for a column heading of
>> 'Tcal...'  which is satisfied by 'Tcal' and 'Tcal Scaled'.
>> Yes, Tcals are screwed up when this column appears.  I will
>> fix this, but not until I get back next week.  (The software
>> now knows the difference, but there are still some old
>> measurements in the system that nobody has noticed yet and
>> asked me to fix.)
>>
>>
>>> Rick, I checked the data files on \\filehost, and the Tcal column
>>> appears to be in the correct range, so I don't understand how the
>>> Tcals
>>> got scaled. However, I did notice in the column heading of the file,
>>> there is a space between '1st' and 'LO'. If the text file was imported
>>> using software, and is using spaces as delimiters, perhaps the parser
>>> got confused and associated the next column over as the Tcals. This
>>> column contains Tcals scaled by a factor of 10, which matches what you
>>> are seeing.
>>>
>>> I noticed a number of the other Tcal files appear to use commas as
>>> delimters - not sure why X-band s/n 004 is different.
>>>
>>> John, thanks for checking this out, and running down the cause.
>>>
>>> Rick Perley wrote:
>>>
>>>>      John McClendon has found (from stress test results) an oddity
>>>> with
>>>> ea20 at X-band.
>>>>
>>>>      It turns out all is explained by a (very) bad Tcal value.  The
>>>> database lists this antenna has having a Tcal of about 22K  (!!!).
>>>> In
>>>> fact, it should be near 2.2K.  A slipped digit, likely.
>>>>
>>>>      Can somebody correct the database for this?
>>>>
>>>>
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>>
>>
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-- 
Keith Morris
National Radio Astronomy Observatory
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Socorro, NM 87801
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