SureCall CM2020 - Antenna Separation

CM2020 Amplifier - Installaon Manual
10
Copyright 2011 Cellphone-Mate, Inc. All rights reserved.
Keep in mind that floor structures in mulstory
buildings can cause significant signal loss, which
means that you may need to install interior anten-
nas on more than one floor. Here is an example of
a mulstory installaon:
Note: You may or may not need anten-
nas on every floor of a mulstory build-
ing depending on factors such as
building material, amplifier gain, etc.
3.4 - Antenna Separaon
Proper antenna separaon is essenal in order to
prevent signal oscillaon (feedback) that can
interfere with the cellular tower. Separaon is
measured in a straight line from the exterior
antenna to the closest interior antenna. The clos-
est allowable distance depends on a number of
factors such as amplifier gain level, building mate-
rial, etc. Recommended separaon distances are:
Amplifier gain Min. separaon (ad)
40dB 5-6’
45dB 15-20’
50dB 50’
55dB 60’
65dB 75-80’
70dB 100’
75dB 100’-120’
80dB 120’-180’