Mentor XL
Viewed from the rear of the unit, the connectors are:
•
Either
- the antenna input should be
connected to a high quality 50Ω
GPS antenna. See
section 12.4 for more information.
•
Or
- the external receiver input connector is designed specifically for the Trimble Acutime
GG external GPS receiver and antenna. This permits installations with cable lengths greater
than 80 m between the Mentor XL and the antenna site. With appropriate wiring, a single
external receiver / antenna can support a pair (main plus reserve) of Mentor XL reference
generators.
•
The AES 1 & 2 outputs provide an unbalanced duplicate of the signals on the D9 connector
(see section 2.7). These are not related to GPS operation and are merely provided here for
convenience. If GPS functionality is
not
required then a 360-15-02 board may be fitted which
simply provides the duplicate AES outputs described above.
12.3.2
Antenna Location – site considerations
Ideally, the GPS antenna should have an unobstructed line of sight to the sky. Rooftops that are clear
of other structures or geographic features overhead, with views to the horizon, generally make good
installation locations. Such a clear view allows the antenna to track the maximum number of
satellites throughout the day. A location on the side of a building can also offer good results but
should be tested before completing the installation. Installations with obstructed views may
experience impaired reception quality and may not be able to track simultaneously the maximum
number of satellites.
When installing a GPS antenna, select a site at which the antenna will not become buried in drifting
or accumulated snow. It should not be covered by foliage, fallen leaves or placed in a position where
it could become obstructed in this way.
Whenever possible, avoid placing the GPS antenna in close proximity to broadcast antennae or near
television or FM radio transmitters. Certain frequencies are harmonics of the GPS signal and can
impair reception.
AES 1 & 2
un-balanced
outputs (optional)
Option Board 1 –
GPS antenna
input
Option Board 1 –
GPS external
receiver
Page 61 of 84
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