Installing a Fixed Station (Continued)
16. Slowly
and
gently
turn the antenna by hand counter clockwise to the point beyond which
the antenna should not come, the so-called (physical) left end limit. Press Enter to set the left
end limit, or press Next if no left end limit is to be set; the following page appears:
!
Do not force the antenna if it cannot be turned easily. This may damage the antenna and/
or the antenna turning mechanism.
The antenna can only be turned by hand if the servo control mode is OPEN LOOP or if the
operating mode (Menu 262) is IDL (idle) or STB (standby). In Configuration mode (Menu 5) the
operating mode of the antenna unit is STB (standby) by default.
Set the operating mode to STB manually (Menu 262) if the antenna cannot be turned by hand.
Make sure to set the operating mode back to OPE (operate) afterwards.
17. Slowly and gently turn the antenna clockwise by hand to the point beyond which the antenna
should not travel, the so-called (physical) right end limit.
Note:
If the antenna can rotate 360° round, this step can be skipped by pressing Next.
18. Press Enter to set the right end limit, or press Next if no right end limit is to be set; the
following page appears:
19. Using the
◄
key and the 0 key to stop the antenna, turn the antenna to the left auto search
scan limit of the antenna.
20. Press Enter to set the left auto search scan limit; the following page appears:
Note:
The left auto search scan limit cannot lie beyond the confiured left end limit. The antenna
stops when the left end limit has been reached.
21. Using the
►
key and the 0 key to stop the antenna, turn the antenna to its right auto search
scan limit.
Note:
The right auto search scan limit cannot lie beyond the configured right end limit. The
antenna stops when the right end limit has been reached.
22. Press Enter to set the right auto search scan limit; the following page appears:
23. Press Next if no reference azimuth needs to be entered; the page at step 29 appears and
continue from there. Otherwise:
24. If there is a suitable reference object of which the bearing with respect to north is known, and
if the optional telescope is available, mount the telescope on the antenna.
Note: For absolute positioning it is important that the antenna unit is levelled, that an accurate
reference azimuth is entered and that the exact position of the Fixed Station is known.
If the system is used for dynamic positioning, then relative positioning is generally all that is
required. If use is made of a reference object: the further away this reference object is, the more
accurate the referencing will be. The reference object should, however, still be visible with the
telescope. If grid coordinates of the reference object and the position at which the Fixed Station
is installed are known, then the reference azimuth can easily be calculated (see below). The
reference azimuth
α
is calculated as follows:
Calculating the reference azimuth from grid coordinates
22
