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Chapter 7 - Design of Wireless Intercom Systems 111
pinched in a door, or bent sharply around a corner, the characteristics of the cable can be
changed dramatically and have a significant negative affect on system performance.
Electromagnetic fields generated by other radios, AC power, arc welders or…, well you
get the idea, can also have a negative affect on your wireless communications system.
Avoid placing antennas near any device that has a strong electromagnetic field associated
with it. Also, do not route antenna cables in the same runs as high voltage AC lines.
Whenever possible, try to keep antenna cables by themselves. The thing to remember is
the RF signal at the receive antenna of a typical wireless intercom system can be less than
0.5µV, that’s 0.0000005 of a volt! It does not take much to disrupt such a small signal and
anything we can do in the installation process to prevent that disruption is time well spent.