User's Manual

Tetrapol Band Selective Repeater
User Handbook
Handbook Nō.-55-124801HBKM Issue No:-1
Date:-22/01/2004
Page:-
17 of 32
5.2
¼Watt 0- -30dB Switched Attenuator (10-000701)
5.2.1 General Application
In many practical applications for Cell Enhancers etc., the gain in each path is found to be
excessive. Therefore, provision is made within the unit for the setting of attenuation in each
path, to reduce the gain.
5.2.2 Switched Attenuators
The AFL switched attenuators are available in two different types; 0 – 30dB in 2 dB steps (as
in this case), or 0 – 15dB in 1 dB steps. The attenuation is simply set using the four miniature
toggle switches on the top of each unit. Each switch is clearly marked with the attenuation it
provides, and the total attenuation in line is the sum of the values switched in. They are
designed to maintain an accurate 50Ω impedance over their operating frequency at both input
and output.
5.3
Low Noise Amplifiers (11-007302 & 11-007402)
5.3.1 Description
The low noise amplifiers used are double stage solid-state low-noise amplifiers. Class A
circuitry is used in the units to ensure excellent linearity over a very wide dynamic range.
The two active devices are very moderately rated to provide a long trouble-free working life.
There are no adjustments on these amplifies, and in the unlikely event of failure then the
entire amplifier should be replaced.
5.3.2 Technical Specification, 11-007302
PARAMETER SPECIFICATION
Frequency range: 380-500MHz
Bandwidth: <140MHz
Gain: 20-22dB
1dB Compression Point: +23.5dB (typical)
3rd order intercept: +36dB (typical)
Input/Output return loss: >20dB
Noise figure: <1.3dB
Connectors: SMA female
Supply: 200-230mA @ 24V DC
operational: -10°C to +55°C
Temperature range:
storage: -30°C to +70°C
Weight: <300gm
Size: 90 x 55 x 30.2 (case only)