Requirements For Installing A Gnss Antenna; Acx500 Router Gnss Antenna Signal Gain Requirements; Table 35: Antenna Mounting Requirements - Juniper ACX500 Hardware Manual

ACX500 Universal Access Router Hardware Guide

Requirements for Installing a GNSS Antenna

Table 35: Antenna Mounting Requirements

Item
GNSS L1/G1 antenna with a frequency band of 1575 to 1610 MHz +/-10 MHz, 3 dB bandwidth
Antenna mount that is used to secure the GNSS antenna
Mounting area clear for at least two meters of any metal or other material that could act as a shield and block the GNSS signal
360° unobstructed clear view of the sky from 15° above horizon
Clamps, cable ties, and so on, to secure cable

ACX500 Router GNSS Antenna Signal Gain Requirements

General ACX500 GNSS Antenna Mounting and Installation Recommendations
88
This section describes the requirements to correctly install a GNSS antenna on an ACX500
router. Table 35 on page 88
antenna.
The ACX500 router requires an active GNSS antenna with built-in low-noise amplifier
(LNA) for optimal performance. The LNA amplifies the received satellite signals first to
compensate the loss due to the cable, and second to lift the signal amplitude to a range
that is required by the receiver.
The cables and connectors that are used to connect the GNSS antenna to the receiver
cause signal loss, which can be up to 13 dB. The signal gain due to the LNA amplification
can be up to 30 dB.
When calculating the required signal for the router, keep in mind the loss due to the cables
and connectors, and the gain due to the LNA amplification. Therefore, if the loss due to
the cables and connectors is 13 dB and the LNA signal gain is 30 dB, then the signal gain
available to the receiver is 17 dB. We recommend that you limit the available gain to less
than 35 dB. Also, ensure that the LNA you select has a low noise profile.
The recommended range of the LNA signal gain, after compensating the loss due to the
cables and connectors, at the receiver is 22 dB through 30 dB (with a minimum of 17 dB
and a maximum of 35 dB).
Ideally, the GNSS antenna should be mounted where a 360° unobstructed clear view of
the sky (at 15° angle from horizontal) is available to enable a connection to visible GNSS
satellites. The ideal mounting location is a roof, tower, or an antenna mast, high above
any obstruction or any device that can cause signal interference. We recommend a
location that has the following characteristics:
Clear unobstructed view of the sky in all directions—360° view.
Away from high-power transmitters and radar antennas.
lists the items that you must provide to install the GNSS
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