User's Manual

Basic Installation
BS Equipment Installation Manual 4 BreezeACCESS MMDS Series
• The AU-RE outdoor unit should be installed as near as possible to its
antenna.
Note: The distance between any two antennas should be greater than 40 cm.
• The outdoor unit is connected to the indoor unit by means of a coaxial IF
cable carrying signals, controls and power. The IF frequency is 440 MHz.
The maximum allowed attenuation of the IF cable is 15dB and its maximum
allowed DC resistance (the sum of the DC resistance of the inner and outer
conductors) is 1.5 ohm. This allows for cable lengths of up to 30m when
using the standard RG 58 cable. If longer cables are required, a cable with
lower attenuation and/or DC resistance should be used.
Table 2-1 provides data regarding several industry-standard cables such as
RG 58 and RG 213. If the spectral environment is polluted with noise in the
440 MHz band, it is recommended to use a higher quality double-shielded
cable such as LMR 240 or LMR 400 (manufactured by Times
Communications).
Table 2-1: IF Cables
Cable Type RG 58 RG 213 LMR 240 LMR 400
Maximum cable
Length (m)
30 100 65 150
• The BS-SH and its modules and the SU-NI are designed for indoor operation,
i.e., inside buildings, a suitable cabinet or a shelter. Air temperature control
might be necessary – the equipment is designed to operate over the
temperature range 0°C to 45°C.
Note: Outdoor units and antennas should be installed ONLY by experienced
installation professionals who are familiar with local building and safety
codes and, wherever applicable, are licensed by the appropriate
government regulatory authorities.