Priority Channel PTT

(Controls, Portable / Mobile Buttons)

If the radio is currently operating in Scan Mode, and there is Priority Member 1 Scan List Member in the current channel's Scan List, then pressing this button causes the radio to key up on the Priority 1 Scan List Member channel, therefore allowing transmission of voice communications; otherwise, the radio blocks the transmission and sounds the Talk Prohibit Tone. This feature is available while operating in Conventional communications mode.

Priority Channel PTT operation is mutually exclusive with the Intercom, Siren and Public Address (PA) functions.

For all APX radios, Priority Channel PTT operation will not perform sending/calling operation when any of the following functions are active in the radio:

Emergency	Status/Message
Call Alert	Siren
Selective Call	Public Address (PA)
Recent Call	Intercom
Phone	Unified Call List
Stun/Kill	Rekey Request
TMS	Evacuation Tone

For the O3 mobile control head, Priority Channel PTT will not perform Hot Keypad sending operation. This is because the O3 mobile control head does not support multi-button press between the side button, the menu softkey, the arrow key, or the keypad. This limitation also impacts other features that need two or more button press at the same time.

The radio handles the first PTT press and release, and ignores the second PTT press and release when the two PTT actions are a different type; in other words:

whenever the radio is already transmitting due to a primary PTT button-press, the Priority Channel PTT button-press is ignored by the radio.
conversely, whenever the radio is already transmitting on the Priority 1 Scan List Member channel, due to a Priority Channel PTT button-press, a primary PTT button-press is ignored by the radio.

Priority Channel PTT button must not be used in DVRS channel and DVRS MSU.

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