System performance, compatibility, and standards

There are two prime purposes of Industry Standards for 2-Way Land Mobile Radio Equipment. They are: 1.) To assure high standards of customer performance and 2.) to assure system compatibility. Examples are given of standards written for both purposes. For example, the logic behind receiver sensitivity and selectivity standards are discussed. Similarily, the importance of standards which assure compatibility between Tone-Coded Squelch Systems, standards for frequency stability, and standards for interference protection between systems are discussed.