|az,za vs focal plane motions|
|moving horn uphill
||same as moving dome uphill|
|moving horn ccw (toward stairwell)||
|x<0 46.79 asecs/inch
|| x along za
positive pointing downhill
|x>0 42.21 asecs/inch
|y 37.08 asecs/inch
||y perpendicular to az arm
positive pointing toward stairwell
||moves horn from focus toward the
stairwell (+y direction).
same as moving azimuth CCW (to lower angle)
|moving turret 1 deg:
=47.3 asecs on sky
= 45 asecs on sky (from measurements)
1.276*37.08secs/in=47.3 asecs on sky
45 asecsSky/degTur comes from measurements on sky.
||radius for center of horn mount (on the
Assumes feed tower position relative to the 2ndary did not changes after kevlar cable installation (2004).
||horn angle relative to floor perpendicular,
tilted so horn is closer to secondary.
||vertical distance top of floor to horn phase
||radius center of floor to horn phase center
70.48 + 18.75*sin(8.11) inches
||scribe mark on rotary floor.
|motion of coma lobe
||moving horn uphill (away from optical axis)
creates coma lobe in - za direction