User's Manual

Maintenance Handbook
Baltimore Radio Repeater System
Handbook No. 60-166501HBKM Page 7 of 26
3.1 Fibre Fed High Power Remote BDA (60-166501)
3.2 Fibre Fed High Power Remote BDA Description
The remote equipment is of two different types, an off-air repeater and a fibre fed repeater.
The optical repeater is directly linked to the master site by fibre optic cable and has a high power
downlink (40Watts) output to the LCX antennas. Both remote repeaters have an automatic gain
control loop in each path to lessen the overloading effects of a mobile operated close to the leaky
feeder antennas. This unit also has its own mains-to-DC power supply or ‘DC in’ (24V).
3.3 Fibre Fed High Power Remote BDA Technical Specifications
PARAMETER SPECIFICATION
494.3-495.3MHz (Downlink)
Frequency range:
497.3-498.3MHz (Uplink)
Bandwidth: 1.0MHz
Manual Gain Adjustment: 0-15dB (in 1dB steps)
Remote gain adjustment: 0-15dB (in 1dB steps)
Downlink1dB Compression Point: > +47dBm
Downlink 3
rd
Order Intercept Point: > +63dBm
Uplink 1dB Compression Point: > +30.5dBm
Uplink 3
rd
Order Intercept Point: > +44dBm
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 Fibre Fed High Power Remote BDA 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: 60kg (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