[evlatests] WIDAR0 results -- antenna 23

[Rob Long]

The other thing we should check is optical levels into the L304 in the 
antenna.  If the signal is high, we have seen oscillations in the LO due 
to overdriving the receiver diode.

Rob

Rick Perley wrote:
>     Quick look at WIDAR0 data reveals an interesting problem with 
> antenna 23:
> 
>     The bandpass has an 8 MHz wide sinusoidal modulation, in all IFs.   
> The amplitude of the modulation is 100% -- so the bandpass amplitude 
> looks like a rectified wave with 4 MHz period, and the phase of each 
> 'lobe' alternates by 180 degrees. 
> 
>     All IFs are identically modulated. 
> 
>     Ken thinks this is a DTS problem. 
> 
>     All other antennas look very good (other than having large delay 
> errors).
> 
>     More, as I sort through this huge database ...
> 
>     Rick  
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