[evlatests] Highly Unstable Gains at High Frequencies (aka UX Converter Switch Problem)

[Vivek Dhawan]

Terry asked which antenna to fix up, they have 4 switches to replace the 'bad'
ones. From the plots in Rick's original email (see title) it looked like ea10
was the worst, so we went with that one.





On 04/26/2018 02:22 PM, Rick Perley wrote:
> Â Â Â  Some important new information has been obtained concerning the 
> long-standing switch problem in the UX converter.
> 
> 
> A) Executive Summary (for the impatient).
> 
> Â Â Â  The amplitude gain instability noted long ago when switching bands 
> amongst Ku, K, Ka and Q bands is now shown to:
> 
> Â Â Â  a) Affect phases with amplitudes of tens of degrees.
> 
> Â Â Â  b) Be completely independent between polarizations (so that the effect 
> above can hugely affect polarimetry).
> 
>     c) Affect *only* the A1C1 and A2C2 IF channels.  The data taken in B1D1 
> and B2D2 are completely stable.
> 
> 
> B) Details (for those whose inquiring minds want to know):
>