User manual

ADCP-75-154 • Issue 3 • August 2006
Page 16
© 2006, ADC Telecommunications, Inc.
5 MHU SPECIFICATIONS
5.1 DD900 Narrow Band Masthead Unit
Table 1 provides typical specifications for the DD900 Full Band Masthead Unit.
Table 1. DD900 Narrow Band Masthead Unit
CATEGORY PARAMETER SPECIFICATION
ELECTRICAL
Nominal impedance of RF input and outputs 50 Ohm
Frequency Range
TX 935–960 MHz or 925–950 MHz
RX 890–915 Mhz or 880–905 Mhz
Duplex Filter Bandwidth 25 MHz
Passband (RX)
Gain 12 dB
Noise Figure 1.4 dB typical
Dynamic Range
Input at 1 dB compression 3.0 dB
IIP3 +15 dBm
Insertion Loss of TX Path (TX to Antenna) 0.2 dB
FILTER
Passband Return Loss
TX Band 20 dB
RX Band 20 dB
Intermodulation –120 dBm
POWER HANDLING
Maximum Input Power at Each BTS Input
RMS Power TX 200 W
Peak Power TX 1.44 kW
Duration 20 microseconds
Period Between Peaks 550 microseconds
Fault Management Bypass
POWER
Operational Voltage 7 to 15 VDC
Operational Current 150 mA
Alarm Current Level
175
± 5 mA
PHYSICAL
Dimensions (HxWxD) 280 x 250 x 85 mm
Weight 5.5 kg
Color Silver
Housing Aluminum
ENVIRONMENTAL
Operating Temperature
–40
° C to +65° C
Outdoor Protection IP65
QUALITY
MTBF < 500,000 hours
Lightening Protection IEC 801-5 and IEC 1312