[evlatests] Antenna 28 Encoder question

[Jim Jackson]

After discussions yesterday between myself, Ken Sowinski and Mark 
McKinnon, I still have to wonder about some form of crosstalk between 
the analog electronics in the AZ and EL encoders. It seems strange 
that on Ken's plots there is both an EL component in the AZ plot and 
a different AZ component in the EL plot.  While this obviously can't 
be occurring across the digital fiber connections from the encoders, 
is there any common DC power supply or reference signal that is 
feeding the analog electronics in both encoders? If so, you may want 
to look for noise, isolation or grounding problems associated with 
these common components. Also, were any components common to both 
encoders in something that was replaced yesterday (particularly a DC 
power supply)?

I may just be grasping at straws here but this would certainly be an 
attractive alternative to any major mechanical problem like the 
Azimuth bearing.

Cheers,
Jim