Axell Wireless Limited
Technical Literature
UHF Dual Band Line Amplifier
Document Number 55-227901HBK
Issue No. 4
Date 23/06/2014
Page 9 of 30
1.2.
Service Antenna Requirements
WARNING!!!
a. The installer is held accountable for implementing the rules required for
deployment.
b. Good engineering practice must be used to avoid interference.
c. Output power should be reduced to solve any IMD
interference issues”
This product is designed as a Line Amplifier repeater to extend the signal coverage distance of a
radiating cable system and must not be used as an off air repeater.
1.2.1.
Required Radiating Antenna Information
The following antenna requirements, specifications and site considerations should be met:
Service area type and size
Radiating Cable Coupling factor and longitudinal Attenuation
Distance from Mobile
Mobile Signal = Line Amplifier Output
– cable attenuation dB/100ft – cable coupling dB – distance
correction.
e.g.
Typical 7/8” cable = loss 0.7dB / 100’ with Coupling Loss 80dB @ 6’
Thus for an 800’ cable with +10dBm input we have:
+10
– (0.7*8) – 80 = -75.6dBm radiated signal from the cable at 6’ distance.
1.3.
RF Cabling Requirements
For all coaxial connections to/from the Line Amplifier -
high performance, flexible, low loss 50Ω
coaxial communications cable.
All cables shall be weather-resistant type
.
Make sure that cable and connector are compatible. Using cables and connectors from the same
manufacturer is helpful.
All connectors must be clean and dry
Waterproof all outdoor connections using silicone, vulcanizable tape or other suitable substance
as moisture and dust can impair RF characteristics.
Make sure enough room has been allocated for the bending radius of the cable. RF cables must
not be kinked, cut or damaged in any way
Use jumper cable for easy installation. The RF Coaxial cable can be substituted at each end with
a jumper cable.