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Manual 7-9547-1 12/09/14 Page 8
Tower Top Box
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
Parameter
Specification
Frequency Band
792 - 824 MHz
Preselector Included
Yes
Preselector Frequency Range
792 - 824 MHz
Type of Amplifier
Quadrature Coupled (Redundant)
Amplifier Switching
Automatic
Type of Amplifier Switching
Solid State RF Switch
TTA Gain (Input to Output of TTA)
23.0 dB (min)
LNA OIP3
> 42 dBm typical
Return Loss of all RF Ports
> 14 dB
Power Requirements
Power derived from RX Cable
Operating Temperature Range
-30 °C to +60 °C
Amplifier Redundancy
Automatic change-over
Lightning Protection
Impulse Suppressor on all external ports
Test Port Included
Yes
Coupling Test Port (Test In / Amp In)
30 dB
50 Ohm Termination Test
Controlled by base unit
Type of RF Test Switching
Solid State RF Switch
Bypass Test Mode
Controlled by base unit
Enclosure
Weather resistant housing
Designed to NEMA standards
Dimensions
8.84” x 5.77” x 6.04”
Net Weight
8 lbs.
Table 2:
Tower Top Box Specifications.
Parameter
Specification
EFP Area (no ice)
0.314 sq. ft.
EFP Area (w 1/2” ice)
0.418 sq. ft.
Wind Speed, Survival
(no ice)
125 m.p.h.
Wind Speed, Survival
(w 1/2” ice)
100 m.p.h.
Note:
EFP stands for “effective flat plate” area.
Table 3:
Tower Top Unit wind loading specs.
