User's Manual

Bronx Justice Centre Radio Repeaters
Handbook Number: 80-283501HBKM Page: 53 of 86
4.2.7.1Description
The BDA shelves amplify the UHF digital signals at specific frequencies, selected by the channel
control modules. They each have a gain of approximately 95dB and switched attenuators after the
input amplifier and at the output so that channels may be individually set up for the best signal levels
at the time of installation.
4.2.7.2Technical Specification
PARAMETER SPECIFICATION
453.750MHz (Ch. 1)
465.0375MHz (Ch. 2)
472.2675MHz (Ch. 3)
479.8375MHz (Ch. 4)
484.0375MHz (Ch. 5)
470.7125
UHF downlink
458.750MHz (Ch. 1)
460.0375MHz (Ch. 2)
471.2625MHz (Ch. 3)
476.8375MHz (Ch. 4)
481.0375MHz (Ch. 5)
UHF Frequencies:
485.6375MHz (Ch. 6)
UHF uplink
Bandwidth: 15kHz (up & downlink)
Height: 3U
Width: 19" (482.6mm)
Shelves
Depth:
<450mm (excluding heatsinks, connectors,
handles and feet)
Downlink Gain(Duplexed): 95dB min
Gain Adjustment: 0 – 15dB (in 1dB step)
Uplink Power: >10Watts
Downlink Power: >10Watts
AGC: Fitted in all channel selective modules
Noise Figure: <6dB (@ maximum gain)
VSWR: better than 1.5:1
Impedance: 50ȍ
RF Connectors: N type, female
Supply voltage: 24V DC (nominal from PSU shelf)
System power requirement: 24V DC @ <10A (fuse rating)
1 Amplifiers Alarms Fitted:
(volt-free contacts/TTL)
2 Channel modules