[evlatests] 3.2 MHz ripple at P-band

[Wes Grammer]

Thanks for the results, Rick. The strong ripple on ea03 is already 
known, and was written up as maintenance form C136024. Now that the 
antennas are close in, perhaps Paul and Mertely can look into and fix 
this issue - as you said, it looks like a cable or cable connector 
termination. Possibly it's the same issue on ea28.

-Wes

On 10/27/2015 12:52 PM, Rick Perley wrote:
> I'm reducing some data taken last Spring in the 'BnA' configuration.
>
>     Good news -- all antennas worked well, except ea18, which had 
> highly variable gain.  All polarizations appear correct.
>
>     Bad news:  Most antennas show a strong ripple in the bandpass, 
> with a 3.2 MHz period -- corresponding to a ~48 meter reflection. Some 
> antennas are considerably worse than others, some considerable better.
>     The two antennas with the strongest ripples are:
>     ea03 :   +/- 20% in power (i.e. 40% pk-pk).
>     ea28:    +/- 10% in power.
>
>     Antenna with essentially no ripple are:  ea02 and ea21.
>
>     All the rest are at the ~5% level.
>
>     Rick
>
>
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