User's Manual

Installation Guidelines CMA-438-AEN Page 21
Draft
3.5.3 Coax Cable Lengths and Losses
Use coax RG-223, 50 ohm, for RF connections between MRU unit and DAS antennas.
Note: The required distance between the antennas (installed in the ceiling) depends on the infrastructure and calculated
path-loss. For example, if there is free space-loss between the antennas, a minimum distance of 100 ft is required; if there are
partitions (loss) between the antennas, a distance of less than 100 ft between them is allowed.
Coax Length
Coax Loss
(900 MHz)
Connector
Loss
Total Loss
30 0.7 1.5 2.2
40 0.9 1.5 2.4
50 1.1 1.5 2.6
60 1.3 1.5 2.8
70 1.5 1.5 3
80 1.7 1.5 3.2
90 1.9 1.5 3.4
100 2.1 1.5 3.6
110 2.3 1.5 3.8
120 2.5 1.5 4
130 2.7 1.5 4.2
140 2.9 1.5 4.4
150 3.1 1.5 4.6
160 3.3 1.5 4.8
170 3.5 1.5 5
180 3.7 1.5 5.2
190 3.9 1.5 5.4
200 4.1 1.5 5.6
Table 3-1. Description of Coax Length and Losses
3.6 Antenna Specifications and Guidelines
Determine the antenna installation configuration, according to the transmission and coverage requirements and the installation
site conditions.
3.6.1 Authorized Antennas and Required Specifications
• External antennas - no limitation on any vendor of available external antennas with respect to the following requirements:
• Omni Directional or directional
• Supported frequency range: wideband antennas supporting a range of 700 MHz to 2600 MHz
• Gain: up to 12.5 dBi
• Impedance: 50 Ohm
• Couplers – Use N-Male to N-Female broadband coupler separately ordered from Corning (P/N AK-1COUPLER-NM-NF)
or the equivalent: