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Chapter 6 - Introduction to Wireless Intercom Systems 93
(IM) or intermod as it is often called, happens when two or more frequencies mix in a non-
linear device and produce a number of related different frequencies known as
intermodulation products. We look at intermodulation in more detail in the next chapter,
but suffice to say, choosing a manufacturer or dealer that is qualified to pick
intermodulation free frequencies is a must.
Now let’s look at cost. Wireless intercom systems cost substantially more at initial
purchase than do hardwired communications systems. For a comparable number of users,
wireless systems cost between two to ten times as much as hard wired partyline systems,
depending on system type and configuration. Because of this increased cost factor, it is
important to determine which members of the production team must be wireless and which
can be tethered by a wire. Of course, everyone wants to be wireless and has a great reason
why they need a wireless beltpack, but in the end you must make the budget meet the
overall production needs.
Generally speaking, the added cost and special consideration factors that wireless
communications systems have to be concerned with are far outweighed by the increased
flexibility and functionality they offer. It is important to choose a wireless system with all
of the facts and considerations in front of you so you can have years of trouble free
operation to come.