[evlatests] C-band, now both IFs

[Robert Hayward]

I've already warned Gustaaf & Rick (repeatedly) that the circular 
polarization outside 4.5-5.0 GHz will likely be "crap". That being said, 
if all they're interested in is intensity, they may find something useful.

By the way, the next Interim C-Band C#9 that we test in the lab will be 
done across the full 4-8 GHz bandwidth using hot & cold "bucket" loads 
with the bottom half of the C-Band feed attached to the receiver (rather 
than just the narrowband Test polarizer). This should give a reasonably 
good approximation of a wideband Y-factor measurement.

-Bob


Dan Mertely wrote:
> Gustaaf:
> 
> Did your experiment do full Stokes?  If so,
> would it be possible to compare the RR & LL data to
> RL & LR data, if it is available?  I am curious to know
> whether the polarization goes to hell above 5 GHz & below
> 4.5 GHz--it should.  We still have a narrow band
> (4.5 - 5 GHz) polarizer in this EVLA interim system.
> The amplitude data may be OK, but polarization
> purity should go bad outside the core range.
> 
> -Mert
> 
> 
> Gustaaf van Moorsel wrote:
> 
>>In my hurry to get the data out before the lunch talk, I only showed
>>IF 1 data.  The attached plot now shows data for both IFs.
>>
>>Notes:
>>
>>IF 1, LL is off-scale at 4.0GHz
>>IF 2, RR had no solution at 4.25 GHz
>>
>>Gustaaf
>>
>>
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