[evlatests] crossed-hand delays

[Ken Sowinski]

On Thu, 18 Nov 2010, Bryan Butler wrote:

>
> the noise sources are different for each polarization.
>
> 	-bryan

No, Bob is right.  I determined the crossed-hand delays by
looking at the crossed-hand autocorrelations just as he
suggested.  I checked a few crossed-hand cross correlations
as well, and they agreed.

Long ago, I did this with the Modcomps and was able to verify
that crossed-hand delays optimized this way gave the correct
answer with a strongly polarized source (3C286), and conversely
that this method gave the correct answer when delays were
optimized in continuum using 3C286.


> Bob Sault wrote, On 11/18/10 13:34 PM:
>> With the switched noise source measurements, presumably the source
>> couples into both polarizations equally, and so cross-delays and
>> RL phase could be measured using this mechanism (ie correlating the
>> R and L of the noise source on one antenna)?