Copyright © 2015 RCA Communications Systems
RPX4500/RPX4600 P25 PORTABLE RADIO – USER MANUAL
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7.3. CHANNEL UP AND DOWN
The current selected Zone’s channel decreases whenever the key is pressed.
The Channel Up and Down functions are normally assigned to the / function keys. They can
be assigned to other keys if necessary.
If the current channel is the first channel, then the lower channel will wrap around to the last
channel in the current zone.
The new channel can be an analog or digital channel.
If pressed and held, the function auto repeats and updates the display for every 5
th
channel.
If the Talk Around function is enabled and selected, then Talk Around will be cancelled when the
channel is changed.
7.4. CRYPTO
The Crypto function provides a shortcut to the Encryption select menu for user selection of the
current encryption key.
7.5. DTMF SEND 1 and 2 (ANALOG)
This function transmits a predefined Dual Tone Multi-Frequency (DTMF) sequence of up to 16
DTMF tones. There are two DTMF send functions, DTMF1 and DTMF2.
Send DTMF is only supported in analog mode and can be assigned to keys F1 to F6.
If an analog channel is selected and transmit is allowed, then activating this function transmits a
predefined DTMF sequence (up to 16 tones).
7.6. KEY LOCK
The Keyboard Lock function is dedicated to the OK key. To use Key Lock, the function has to be
enabled through the PS. To unlock the keys, the OK key must be held down for 2 seconds. The
keys will then auto-lock again 10 seconds after no user activity.
With the exception of Emergency, PTT and the function key that has been assigned as the Reset
Function, keys are locked in this mode.
7.7. LOW POWER
This function forces the radio to low power transmit operation. Pressing the function key again
puts the radio back to the power level defined for the current channel. The ‘forced low power
state’ is not affected by channel/zone changes.
The RF power level is indicated by the letter L (low) or H (high) replacing the antenna icon when
transmitting. The graph above this icon shows one bar for low power and six bars for high
power.
7.8. MENU
The Menu function key is used for accessing the menu system. This is normally assigned to the
“M” key (F1).