Yaesu G-5500 User Manual - G-400 A
9
G-400 A
ZIMUTH
R
OTATOR
C
ALIBRA
TION
Azimuth Offset Null
r Before calibrating the Rotator, check to see that the GS-
232A’s DIP switch (switch 5)is set to the “OFF” posi-
tion.
r From the Controller panel, set the Rotator fully counter-
clockwise (set to 180°).
r Press [O] Ž [↵] (the letter “oh”, and “E
NTER
”) on the
computer keyboard to activate the azimuth calibration
routine. The computer display should show AZaaaa =
bbbb returned from the Interface Board, where aaaa
and bbbb are four-digit numbers padded at the left with
zeroes.
r Adjust the AZ trimmer (located on the bottom case of
the GS-232A) while watching the computer display, until
the four-digit numbers aaaa and bbbb are the same
(the precise values are not important).
r Turn off the GS-232A’s POWER switch to exit the azi-
muth calibration routine, then turn on the GS-232A’s
POWER switch again.
Azimuth A-D Calibration
r From the Controller panel, set the Rotator fully clock-
wise (to the right).
r Press [F] Ž [↵] (“F” and “E
NTER
”) on the computer key-
board to activate the Control Interface’s azimuth A-D
converter calibration routine. The computer’s display
should show +aaaa, where aaaa is a four-digit num-
ber which indicates the azimuth heading in degrees.
r Adjust the FULL SCALE ADJ 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
azimuth rotator to the South (the fully clockwise set-
ting).
r Turn off the GS-232A’s POWER switch to exit the azi-
muth A-D converter calibration routine, then turn on the
GS-232A’s POWER switch again to turn it back on.