14
G-500 E
LEVATION
R
OTATOR
Elevation Offset Null
r
From the Controller panel, set the Elevation Rotator to
the “left” horizon (down, set to 0°).
r
Press [
O2
]
Ž
[
↵
] (the letter “oh,” “2,” and “
E
NTER
”) on
the computer keyboard to activate the elevation calibra-
tion routine. The computer will return
AZ
aaaa
=
bbbb
,
as in the previous procedure,
plus
EL
cccc
=
dddd
to
the right, where
cccc
and
dddd
are four-digit numbers
padded at the left with zeroes.
r
Adjust the
EL
trimmer (located on the bottom case of
the
GS-232A
), so as to make the numbers
cccc
and
dddd
are the same (again, the actual values are unim-
portant).
r
Turn off the
GS-232A
’s
POWER
switch to exit the el-
evation calibration routine, then turn on the
GS-232A
’s
POWER
switch again to turn it back on.
C
ALIBRA
TION
Elevation A-D Calibration
r
From the Controller panel, set the Elevation Rotator to
full scale (180°: “right” horizon).
r
Press [
F2
]
Ž
[
↵
] (F, 2, and
E
NTER
) on the computer key-
board to activate the Control Interface’s elevation A-D
converter calibration routine. The computer will display
+
aaaa
+
eeee
, where
eeee
is a four-digit number which
indicates the elevation heading in degrees. For the pur-
poses of this alignment, you may ignore the (azimuth)
aaaa
numbers.
r
Adjust the
OUT VOL ADJ
potentiometer on the
GX-
500
so as to get a reading of “
0180
” on the computer’s
display. This reading (“180 degrees”) corresponds to
the actual beam heading you established when you
pointed the elevation rotator to the 180° position.
r
Turn off the
GS-232A
’s
POWER
switch to exit the el-
evation A-D converter calibration routine, then turn on
the
GS-232A
’s
POWER
switch again to turn it back on.
