Through written evaluation the applicant will identify

                                               The function of a repeater

In the simplest of radio systems, called a "simplex" system, each unit communicates directly with other units.

All units use the SAME frequency to transmit and receive.

Because all the units in a simplex system use the same frequency or channel, the communications are one way at a time.

A simplex radio system works fine for large, open flat areas. In cities, suburban areas, and mountainous regions; however buildings and hills block radio signals thereby reducing the radio systems' effectiveness.

 Every time a message is relayed, it tends to get changed or garbled. A way to reduce garbling is to allow two units to communicate directly. One method of establishing direct communications for mobile units that are out of "direct range" is the REPEATER.

    A repeater is a radio receiver/transmitter combination The repeater is often called "the machine" to differentiate it from the other units in the system. They are installed on a hill, a tall building, or a radio tower.   
The machine automatically RETRANSMITS the signal it received on one frequency (F1) on another frequency (F2).

Our thanks to Dan Yemiola AI80
http://www.qsl.net/ai8o/RPTRWORK.html