U H F B I D I R E C T I O N A L A M P L I F I E R T E C H N I C A L M A N U A L
4
15
Voltage
+48V +6V
16
Power consumption
35W (max) when connected to 48 V. DC
40 W max when connected to 120 V. AC
700 mA max ; 48 V. DC
3100mA max; 120 V. AC
17
Impedance
50Ω
18
In/Out Connector
N (F)
19
Size(W*H*D)
24in x 13.5in x 20in
20
Operating Temp
-20 ~ +55℃
Block Diagram Details
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The UHF Amplifier module contains a (Low Noise Amplifier) LNA designed to detect a very weak
signal. This stage is bypassed if the signal level at the input is higher than -20dBm
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The LNA is followed by an Automatic Gain Control (AGC). The AGC circuit measures composite
power level at the VGA input and adjusts the gain automatically, in order to maintain a constant signal
level at the VGA output delivered to the Power Amplifier (PA). Channel filters are inserted, in order to
reject adjacent channel signals and to improve the signal quality.
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The PA provides good performance for both linearity and efficiency. This amplifier has a heat sink
mounted to it. It has a high compression point and a high 3
rd
order Intercept point.
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The main AC input accepts 50/60 Hz with a 115 to 220 V AC power source. The Power Supply Unit
(PSU) converts AC to DC voltages to supply DC power to the amplifiers, monitoring and control units.
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The unit does not have a built-in UPS/Battery system. In case of inconsistency in the AC line power,
surge protection, short blackouts, high crossover time from the line AC to generator power, circuit
breaker for short circuit and overload protection, etc., an external UPS/Battery system is recommended.
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The amplifier is intended to be used in a BDA system that includes two duplexers; one at the BTS port
allowing the use for only one donor antenna for both UL and DL. The second duplexer is mounted at
the Service DAS antenna port. These duplexers provide at least 100 dB isolation at each end between
the two paths.
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A set of manual gain controls (MGC), ranging from 0 to 30 dB in 2 dB steps. Another set ranging from
0 to 15 dB in 1 dB steps are also added in the chain for additional attenuation if it is needed.
