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KOALATYAUSTRALIA

Channelised repeater coverage underground

Two-way radio carried from a surface headend down the decline and shaft to the working levels, using a channelised repeater rather than additional base stations.

RFI's DSPbR is a channelised repeater handling up to eight bi-directional channels in a single unit, with cross-band operation that translates one frequency plan to another. Its power efficiency, size and remote alarming make it an economic alternative to additional base stations underground.

HEADEND
DSPbR, up to 8 channels
BANDS
VHF / UHF / 700 / 800 MHz
CROSS BAND
Supported
DISTRIBUTION
Radiating cable
AMPLIFIERS
380 – 520 MHz, band selective

PRINCIPAL PARTS

System schematic

VERTICAL SECTION — NOT TO SCALE

Select a numbered callout to see the equipment at that position and its published specification. Keyboard: tab to a callout, press Enter.

Underground mine coverage systemSection showing a surface headend beside the portal, a radiating cable carried down the decline, in-line amplifiers on two levels and a shaft feeder to the deeper level.SURFACESURFACE HEADENDDECLINE 1:7LEVEL 1LEVEL 2DEPTH240 m380 mTO SURFACE CONTROL ROOMCallout 1 — Surface headendChannelised repeater and filtering in a surface building beside the portal.1Callout 2 — Decline feeder runRadiating cable carried down the decline on the back, clear of the vehicle envelope.2Callout 3 — In-line amplifier, level 1Bi-directional amplifier in a bore-mounted enclosure on the first level.3Callout 4 — Branch divider at the shaft stationLow-PIM divider feeding the shaft and the deeper level from the level 1 run.4Callout 5 — Shaft feederVertical radiating cable run down the shaft, supported clear of the connectors.5Callout 6 — In-line amplifier, level 2Bi-directional amplifier on the deeper level, at the end of the longest path in the system.6Callout 7 — Monitoring to the surfaceAmplifier status and level reported to the surface control room.7
CALLOUT 01SUR-01

Surface headend

DSPbR channelised repeater in a surface building beside the portal. Up to eight bi-directional channels in one unit, with cross-band operation where the surface and underground plans differ.

SUPPLIED PRODUCT
DSPBR
DSPbR® VHF/UHF/700/800MHz Repeater
CHANNELS
Up to 8, bi-directional
BANDS
132 – 870 MHz, per plan
CROSS BAND
Supported
TYPE
Channel selective
SYSTEM
Underground mine
VIEW
VERTICAL SECTION
CALLOUTS
7 positions
PARTS CITED
7 of 7

Where this applies

  • 01Declines and drives where a surface base station has no path underground.
  • 02Operations needing more channels than a single repeater band plan allows, using cross-band translation.
  • 03Deepening mines where the distribution is extended level by level as development advances.
  • 04Sites where additional base stations are uneconomic against a channelised repeater.

Equipment in this system

Every numbered callout on the schematic names a real RFI part. Select a callout to open its published specification, or browse the full range in the catalogue.

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TERRITORY
Asia and EMEA
BRANDS
RFI · ANDREW · RFS

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