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Transmitter
Functions
Transmitter Tail Sequence
There are a number of commands which control the Transmitter Tail
Sequence. Figure 2 will help in the understanding of them. The terms used in
these commands are defined as follows.
Courtesy Delay and Courtesy Message
When a transmitting station unkeys his/her microphone, the Courtesy Delay
starts. When the courtesy delay timer times out, the Courtesy Message is sent.
At the same time, the repeater Transmitter Timeout Timer is reset. The
purpose of the courtesy message is to inform the next station that he/she may
now transmit for the full duration of the transmitter timeout timer. The courtesy
delay encourages stations to allow a short break in their transmissions,
allowing other stations to break in.
Dropout Delay and Dropout Message
After the courtesy delay resets, another timer, the Dropout Delay starts. When
the dropout delay times out, the Dropout Message will be sent, and the
repeater transmitter will drop. (Dropout delay is sometimes referred to as Hang
Time.)
Transmitter Timeout Timer and Timeout Message
If a station transmits for a longer period than set by the Transmitter Timeout
Timer, the Timeout Message will be sent and the repeater transmitter will drop.
Transmitter Functions
Chapter 17
17-1
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