MBF-40 SMR700/SMR800 PS REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage Date: 28-Jan-16 www.cobham.com/wireless
Doc. No. 00046UM Rev. 2.1
Page | 9
2.2 Infrastructure and Cabling Considerations
This section includes the following information:
• RF and grounding cabling guidelines
• Power requirements
• F/O installation guidelines
• EMV protection requirements
• External alarm and relay considerations
• Criteria for selecting the repeater location
2.2.1 RF Cable Installation Guidelines
• For all coaxial connections to/from the Repeater – use high performance, low-loss, 50 ohm
coaxial communication cables.
• All cables shall be weather-resistant type.
• Cable length – determined by the Repeater installation plan. When calculating the cable length,
take into account excess cable slack so as not to limit the insertion paths.
• Make sure the cable and the 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 silicon, vulcanizable tape or any 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.
• Connect the RF cable to the antenna tightly but without damaging threads.
• Fasten cable tightly to cable ladder or aluminium sheet.
• For short length feeder cables, use 1/2”; for longer feeder cables, use 7/8”. Choose thicker coax
cables for lower attenuation. Minimize the length of the coax cables to reduce attenuation.
• Use jumper cable for easy installation. The RF coaxial cable can be substituted at each end with
a jumper cable.
2.2.2 Grounding Wires Requirements
WARNING!!! Do not use the repeater grounding bolt to connect external devices.
Requirements for grounding wires
• Ensure that good grounding protection measures are taken to create a reliable repeater site.
• Make sure to use adequately dimensioned grounding cables. The minimum recommended
conductive area for a grounding cable is 16mm
2
• Make sure the grounding product used is suitable for the type and size of used cable.
• Connect the repeater box bolt to the same ground.
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