Telex 38109-977 manual

(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.

C h a p t e r 6 - I n t r o d u c t i o n t o W i r e l e s s I n t e r c o m S y s t e m s 93