Bird Technologies 429-83H-01 Series-Manual - Manual (Page 11)

TX RX Systems Inc. Manual 7-9439-6 09/03/09 Page 3
The quad-amplifier in the tower top box amplifies
the weak received signal before the signal enters a
long and lossy transmission line, thus preventing
the line loss from degrading the signal-to-noise
ratio. The quadrature amplifiers have a separate
power circuit for each half of the amplifier which
provides component redundancy as well as unsur-
passed IM performance. Microprocessor controlled
fault detection circuitry in the tower top box pro-
vides continuous monitoring and switching of each
quad amplifier while sending operational data to
the base unit front panel for at-a-glance status
reporting and form-C contact switching for alarm
integration. Included in the tower top box is a pre- selector filter, amplifier “A” and amplifier “B,”
switching circuitry, control board and PolyPhaser
surge suppressors (see Figure 1). The specifica-
tions for the tower box are listed in Table 2.
The ground-mounted MCU shown in Figures 2A
through 2C is intended for 19-inch rack mounting.
It houses amplifier and signal distribution assem-
blies, alarm indicators, a power supply or DC-DC
Electrical Specifications
Frequency Range 792 to 824 MHz
Net Gain 23 dB
Noise Figure (typ /max) 2.7 / 3.0 dB
Backup Amplifier Switching Solid State RF Switch
Integrated Test Port
Isolation 45 dB
Preselector Type
Loss
Rejection
7-pole TEM Bandpass
with cross-couplings
<0.8 dB
>60 dB @ 776 and 851 MHz
LNA Type
Gain
Noise Figure
3rd Order Input IP
2-stage Quadrature
integrated into filter
26 dB
1.2 dB
18 dBm
Impedance 50 Ohms
Antenna Port VSWR 2 : 1
Power Requirements 12 VDC @ 1.25 A
Lightning Protection Impulse Suppressor on all
external connectors
Operating Temp Range -30° C to +60° C
Mechanical Specifications
Enclosure Modified NEMA 4x:
Stainless steel
weather resistant
Connectors N -female
Dimensions (HWD)
not including mounting tabs
and connectors 18” x 6” x 6”
(457 x 152 x 152 mm)
Net Weight 20 lbs (9.1 kg)
Table 2: Tower box specifications. Values are typical unless
noted otherwise.
Electrical Specifications
Frequency Range 792 to 824 MHz
Multicoupler Net Gain +1 dB typ; 0 dB min
Distribution Amp Type
Gain
Noise Figure
1 dB compression point
3rd Order Output IP Quad-Coupled dual stage
23 dB
4 dB
27 dBm
46 dBm
Number of Outputs
Split Loss 16 or 32
18 dB
Impedance 50 Ohms
VSWR <2 : 1
Connectors
to TTA
to BTS
Test Port input
N - Female
BNC - Female
BNC - Female
TTA NET GAIN
electronic attenuator 0 to 15.5 dB
in 0.5 dB steps
DISTRIBUTION
electronic attenuator 0 to 3 db
in 0.5 dB steps
Alarm / Warning Contacts Two Form-C Contacts
Nominal 2A @ 30 VDC
or 0.5A @125 VAC
I/O Ethernet
Power Requirements
Model 429-83H-01-M
Model 429-83H-01-M-48 90 - 240 Vac @ 50/60 Hz
-48VDC
Operating Temp Range 0° C to + 50° C
Mechanical Specifications
Enclosure Standard EIA 19” Rack Mount
Dimensions (HWD) 1 RU x 19” x 14”
(38 x 483 x 356 mm)
Net Weight 10.5 lbs (4.8 kg)
Table 3: Multicoupling Unit specifications. Values are
typical unless noted otherwise.