User's Manual

Bronx Justice Centre Radio Repeaters
Handbook Number: 80-283501HBKM Page: 73 of 86
4.5.1 Downlink Power Amplifier Shelf Description
The 100W amplifier shelf is a linearised Class A amplifier where 4 linearised power amplifiers are
combined together in a series/parallel configuration which yields approximately double the output
power per path. Its housing is a 4U 19” Rack with SMA connectors for the RF input/output, 2 D-
Type connectors for the alarm function and 2 DC connectors with fuse for the 24 DC supply. Its
cooling is realized by fans mounted on the front panel.
It has a built in Current Fault Alarm Function with the four amplifiers in two summary alarm paths.
The summary alarm on D connector ‘A’ will show an alarm for the two amplifiers mounted on the
top of the shelf. The summary alarm on D connector ‘B’ will show an alarm for the two amplifiers
mounted at the bottom of the shelf.
4.5.2 Downlink Power Amplifier Shelf Electrical Specifications
PARAMETER SPECIFICATION
Frequency range: 851-866MHz
Bandwidth: <30MHz
Gain: 36dB (typical)
Gain Flatness: <0.5dB
1dB Compression Point: +43.5dBm (typical)
3rd order intercept: +61.5dBm (typical)
Input/Output return loss: >15dB
Connectors: SMA female
Supply: 24V DC @ 16-18Amps
Alarms: ‘D’ conn. Pins 1 & 2 (x2)
4.5.3 Downlink Power Amplifier Shelf Mechanical Specification
PARAMETER SPECIFICATION
Height: 4U
Width: 19" (482.6mm)
Shelf:
Depth:
<450mm(excluding heatsinks,
connectors, handles and feet)
operational: -20°C to +60°C Temperature
range:
storage: -40°C to +70°C
Weight: <25kg
Humidity: 5 – 95% non-condensing
RF Connectors: N type female
Environmental protection: IP44
4.5.4 Downlink Power Amplifier Shelf System Diagram
See section 4.3.4