Copyright © 2015 RCA Communications Systems
RPX4500/RPX4600 P25 PORTABLE RADIO – USER MANUAL
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6.7. TRANSMITTING
WARNING
RADIO FREQUENCY RADIATION. A RF RADIATION HAZARD EXISTS IN THIS
EQUIPMENT. TO AVOID RF INJURY, DO NOT TOUCH THE ANTENNA WHEN THE
TRANSMITTER IS IN USE. DO NOT OPERATE TRANSMITTER WITH ANTENNA
DISCONNECTED. REFER TO THE PERSONAL SAFETY PAGES.
To avoid interfering with other users of the channel, listen prior to transmitting to ensure no
transmissions are occurring. Make sure that the Outline Speaker Icon
is not shown. If
required, the radio may be programmed to prevent transmission on a busy channel.
To determine if your radio is ready to transmit, push the PTT switch and check to see if the Tx
Light Emitting Diode (LED) turns Red. If the Tx LED is red, hold the radio a few inches from your
mouth, press the PTT switch, wait for a Grant tone, and then speak clearly across the face of the
portable in a normal conversational manner.
Note.
The microphone is located near the bottom right hand corner of the portable radio’s
speaker grille.
In most systems it is important to wait a short time between pressing the PTT and commencing
to speak. This ensures that the path is properly established and avoids lost, truncated or distorted
speech.
Use correct operating procedures and keep your transmissions short.
Release the PTT as soon as you finish speaking.
The talk group for a transmission is usually associated with a channel selection. A talk group will
address all others that have the same TGID selected.
While on a P25 channel, the transmission will be P25 digital. For an analog channel, the
transmission will be analog FM.
Note.
A Transmit Limit Timer may be setup that limits a continuous transmission on a channel.
The last 10 seconds before the timer expires may be accompanied by warning tones.
6.8. SCAN FUNCTIONS
The Scan/Vote Function allows the sequential searching of up to 16 channels if the selected
zone channel is programmed as a Scan channel, and 15 channels if the selected zone channel is
programmed as a Vote channel, for a valid signal (C CTCSS/DCS tone for Analog FM or
NAC for P25). When found, the radio will stop on that channel until the signal disappears again.
To activate Scanning, select a channel that has been programmed as a Scan channel. Once
selected, the scanning will either start automatically if programmed, or the programmed scan
function key will have to be pressed. (Scanning is PS configurable.)
