TeeJet RX 400p - Manual (Page 27)

RX 400p
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1.4 Installing the CDA-2B Antenna
The location chosen for installation of the CDA-2B antenna will influence the overall
performance of the RX 400p receiver. When installing the antenna:
Choose a location with a clear, unobstructed view of the sky. This is important for
GPS, WAAS, and OmniSTAR signal reception.
Choose a location that is at least three feet away from all forms of transmitting
antennas, communications, and electronic equipment. This will reduce the amount
of noise present at the antenna, improving beacon receiver performance.
The position calculated by the RX 400p is measured to the center of the CDA-2B
antenna. Install the antenna in the best location for your application, such as the
centerline of your vehicle or vessel.
Do not locate the antenna where environmental conditions exceed those specified in
Section 1.3.2.
1.4.1 Antenna Placement To Optimize Beacon Reception
When using the internal beacon receiver as the correction source, selecting an
appropriate location for installation of the antenna will influence the performance of
the internal beacon receiver of the RX 400p. The following list provides some
general guidelines for deciding upon an antenna location:
Ensure that the antenna is as far as possible from all other equipment that emits
Electromagnetic Interference (EMI), including DC motors, alternators, solenoids,
radios, power cables, display units, and other electronic devices.
If you are installing the antenna on a vessel (using DGPS beacon corrections), mount
the antenna as high as possible, considering maintenance and accessibility. In
addition, ensure that the antenna is lower than the highest metal object on the vessel.
If a radar system is present, mount the antenna outside the path of the radar beam.
Your beacon receiver calculates a Signal to Noise Ratio (SNR), measured in dB
(Decibels) that indicates the receiver’s performance. The SNR is height of the signal
above the noise floor. The higher the SNR, the better your beacon receiver is
demodulating the signal. The optimum antenna location will be a position where
your average SNR is highest. You should turn on all accessories that you intend to
use during normal operation when locating the best position for the antenna.