User's Handbook

Roseville Tunnel PCS Band Selective Repeater
User Handbook
Handbook Nō.-55-151601HBK Issue No:-A
Date:-22/04/2005
Page:-
17 of 29
4.2 PCN Splitter/Combiner (05-002601)
4.2.1 Description
The Splitter/Combiner used is a device for accurately matching two or more RF signals to
single or multiple ports; most usually within a specified frequency band, whilst maintaining
an accurate 50Ω load to all inputs/outputs and ensuring that the VSWR and insertion losses
are kept to a minimum. Any unused ports will be terminated with an appropriate 50Ω load.
4.2.2 Technical Specification
PARAMETER SPECIFICATION
Narrowband: 1700–2000 MHz
Frequency Range:
Broadband: 1500–2200 MHz
Narrowband: 300 MHz
Bandwidth:
Broadband: 700 MHz
Inputs: 1
Outputs: 2
Narrowband: >20 dB
Isolation:
Broadband: >18 dB
Narrowband: 3.3 dB
Insertion Loss:
Broadband: 3.5 dB
VSWR Input & Output: Better than 1.3:1
Connectors: SMA female
Weight: 200gms
Size: 54 x 44 x 21mm
Splitter: 20 Watts
Power Rating:
Combiner: 0.5Watts
4.3
¼Watt 0- -30dB Switched Attenuator (10-001204)
4.3.1 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.
4.3.2 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.