User's Manual

MBF-40 AMERICAS REPEATERS
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage Date: 14-Feb-16 www.cobham.com/wireless
Document number: 00071UM Rev. 4.3
Page | 2-5
• 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.
2.1.4 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.
2.1.5 Power Requirements
This section describes the circuit breaker requirements and power cabling and connection
considerations for 230VAC power source and for -48VDC power sources.
2.1.5.1 Circuit Breaker Requirements
The power connections to the unit are hard-wired. To disconnect the unit (either manually or
automatically in case of overcurrent), it is required to install a circuit breaker
on the wall near the
unit
, at an easily accessible distance and location from the unit.
Circuit-breaker minimum requirements
• 250 VAC - Maximum current 10A
• Needs to be SAFETY approved
• Use only a two-pole disconnect device.
• Requires minimum contact separation of 3mm.
• Install on the wall near the unit.