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Pretime (ms) Enter the desired value directly or use the UP/DOWN arrow keys to
make your selection. Pretime is the period of time between transmitter
key-up and the first bit of a data transmission during which the carrier
may be modulated or unmodulated.
In the case of MDC transmissions, the default is unmodulated, but the
carrier can be modulated if Bit Sync Packets are added as explained
above. In case of STAR and ATIS transmissions, the carrier is
unmodulated during pretime. The pretime period allows the receiving
unit to stabilize so data can be recovered. The duration of the pretime
can be set from 0 and 2550 ms in 10-ms increments.
The default is 500 ms.
Interseq Delay Period (ms) Enter the desired value directly or use the UP/DOWN arrow keys to
make your selection. This field is used to customize the length of time
between MDC data packets that are part of the same message. The
valid range is 0 to 2550 ms in 10-ms increments.
The default is 60 ms.
Number of Polites Enter the desired value directly or use the UP/DOWN arrow keys to
make your selection. This is the number of times the radio will attempt
to transmit an MDC emergency message in “polite” fashion. A polite
attempt is one where the radio transmits only when no one else is
transmitting on that channel. Valid settings range from 0 to 254 in
increments of 1. The number of polites can also be set to 255 (Infinite)
in which case the radio will stop transmitting only when an
acknowledgment is received, or the battery runs down, or the radio is
powered off.
The default is 5.
Number of Impolites Enter the desired value directly or use the UP/DOWN arrow keys to
make your selection. This is the number of times the radio will
transmit in an “impolite” fashion. An impolite transmission is one
where the radio transmits regardless of whether or not anyone else is
currently transmitting on the channel. The radio resorts to impolite
transmissions only if the following conditions are met:
• Polite transmissions have been exhausted without an
acknowledgment; or
• The Limited Patience time has expired on a polite transmission.
Valid settings range from 0 to 254 in increments of 1. The number of
impolites can also be set to 255 (Infinite) in which case the radio will
only stop transmitting when an acknowledgment is received, or the
battery runs down, or the radio is powered off.
The default is 15.
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