User's Manual

800MHz & VHF Cell Enhancers
Maintenance Handbook
H/book Number:-50-078001HBKM
Issue No:-
A
Date:-02/09/2004
Page:-
60 of 88
5.13 ¼Watt 0- -30dB & 0-15dB Variable Attenuators (10-000701 & 10-000901)
5.13.1 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.
5.13.2 Switched Attenuators
The AFL switched attenuators are available in two different types; 0 – 30dB in 2 dB
steps, 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 50 impedance over their operating
frequency at both input and output.