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ARCHIVE June 2010 Tech Talk By Jim Purvis WA7HRG CTCSS (PL) Tones In the early days of Land Mobile Radio, when usable VHF frequencies were at a premium, and it was very likely to have more than one user licensed on a channel, it became cluttered very quickly. Commercial repeaters were scarce and a coveted resource. It would not be uncommon to have several companies with several mobile radios each on the same repeater or channel. Let’s say that Joe’s Plumbing had 5 service trucks...

Wireless propagation fundamentals Industrial wireless tutorials: Understanding wireless propagation fundamentals will help you understand what can happen to a wireless signal and how that can influence wireless signal reliability. See 6 diagrams to illustrate wireless propagation. Learn the 4 results of multipath. Wireless reliability requires, in part, that the signal be transmitted reliably. Ideally, radio waves will travel from the transmitter to the receiver with no loss in signal...

Radio frequency basics Industrial wireless tutorials: Any radio frequency (RF) discussion quickly expands to the entire technology surrounding the generation and propagation of a radio signal or wave. Here’s what you need to know. Any radio frequency (RF) discussion quickly expands to the entire technology surrounding the generation and propagation of a radio signal, or wave. A radio wave is an electromagnetic phenomenon like sound* and light. Radio waves act more like light than sound...