[evlatests] 3-bit, 8-bit alternation test (was Any Volunteers ?)

[Mark Claussen]

I took a look at this data.   There are 28 minutes of data at Ku band, 
alternating  between 3-bit and 8-bit, each in ~2m scans.  The purpose 
of this  (I believe) was to  determine how stable the data was in this 
switching mode (the 3 bit samplers were not turned off, but the output 
was switched between the 3-bit and 8-bit devices).

Except for some startup and atmospheric nuisances, the stability looks 
quite good.  Phases and amplitudes come back to the same values for 
each baseline each time the 3- or 8- bit outputs are selected.   I have 
shared the results with Ken, and he seemed happy with them.

One note:  EA07 seems to have low gain as compared with the
rest of the antennas (this test only used the antennas outfitted with
3-bit samplers), but this is true for both 3- and 8-bit paths.

Mark




On Wednesday 16 November 2011 12:49, Rick Perley wrote:
>     Ken took this short test.  I'm complete buried in 3-bit data from 
> last night. 
>     Any takers?  This one is easy to reduce. 
> 
>    
> 
> -------- Original Message --------
> Subject: 	another 3/bit-8bit alternation test
> Date: 	Wed, 16 Nov 2011 11:37:24 -0700 (MST)
> From: 	Ken Sowinski <ksowinsk at aoc.nrao.edu>
> To: 	Rick Perley <rperley at aoc.nrao.edu>, Michael Rupen 
> <mrupen at aoc.nrao.edu>
> 
> 
> 
> Rick,
> 
> Here is another example of alternating 3-bit and 8-bit scans.
> This time the 3-bit is 2GHZ, the 8-bit is a single 128 MHz
> subband pair.  What I expect is that the data is stable
> from scan to scan.
> 
> ku_switch_2GHz was run from 1800 to 1828 UT.
> 
> Ken
> 
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