The call sign of the repeater. Used to alert users to an emergency in some areas of the country. Standard EIA frequency codes are listed later in this chapter. These frequencies are intended to provide spectrum for experimental repeaters, search and rescue operations, portable public service systems and to act as a holding place for repeaters awaiting coordination. The frequencies are shared by all users.
Operators receive no protection from other co-channel users.
These repeaters would not respond to weak distant signals on their inputs and correspondingly not transmit and repeat to add to the congestion. Breaker - A ham who interjects his call sign during a QSO in an attempt to get a chance to communicate over a repeater. Closed Repeater - A repeater whose use is limited to certain individuals. These are completely legal under FCC Rules. Courtesy Tone - A short tone sounded after each repeater transmission to permit other stations to gain access to the repeater before the tone sounds.