User's Manual

Maintenance Handbook
Baltimore Radio Repeater System
Handbook No. 60-166801HBKM Page 7 of 23
3.1 Off-Air (M.O.C.E) Remote Repeater (60-166801)
3.2 Off-Air (M.O.C.E) Remote Repeater Description
The off-air (M.O.C.E) repeater is linked to the master site by a dedicated antenna and has a low
power (5Watts) downlink output to the mobile antenna. The repeater has an automatic gain control
loop in each path to lessen the overloading effects of a mobile operated close to the uplink leaky
feeder antennas.
This unit also has its own mains-to-DC power supply or it can accept an external ‘DC in’ source (24V).
A 100W, 12V DC/DC converter mounted in the repeater supplies all the DC needed for the amplifiers
except for the 40Watt uplink power amplifiers which are supplied from 24V DC.
A channel selective module with a wide bandwidth (1.25MHz, I.F.) is fitted in both paths to enable all
15 channels to be accommodated within a tightly controlled band.
3.3 Off-Air (M.O.C.E) Remote Repeater Technical Specifications
PARAMETER SPECIFICATION
494.3-495.3MHz (Downlink)
Frequency range:
497.3-498.3MHz (Uplink)
Number of channels 1
Channel bandwidth: 1.25MHz
Remote gain adjustment: 0-15dB (in 1dB steps)
Rejection at opposing band: > 60dB
Downlink1dB Compression Point: > +37.5dBm
Downlink 3
rd
Order Intercept Point: > +50dBm
Uplink 1dB Compression Point: > +47dBm
Uplink 3
rd
Order Intercept Point: > +63dBm
Noise Figure: <6.0dB at any gain setting
Impedance: 50 ohms
RF Connectors: N type, female
Power Supply: 110V AC (nominal)
Power consumption: <8A ( @ 12V)
operational:
-10qC to +60qC
Temperature range:
storage:
-40qC to +70qC
3.4 Off-Air (M.O.C.E) Remote Repeater Mechanical Specifications
PARAMETER SPECIFICATION
Height: 820mm
Width: 620mm
Case size
Depth: 250mm
(excluding heatsinks, connectors, handles and feet)
Fixings: 4 holes on 670(w) x 775(h)mm
operational: -10°C to +60°C
Temperature range:
storage: -40°C to +70°C
Weight: 50kg (approximately)
RF Connectors: N type female
Environmental protection: IP65 (with door closed and all ports terminated)
Case: Semi-gloss grey (RAL 7035)
Heatsinks: Black anodised
Finish:
Handles: Black high impact technopolymer
Supply Cable:
Unit supplied with suitable supply input leads with
connector and appropriate length of cable