Copyright © 2015 RCA Communications Systems
RPX4500/RPX4600 P25 PORTABLE RADIO – USER MANUAL
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7.14. SCRAMBLER (ANALOG)
This function enables transmitted voice to be scrambled in order to prevent radios without a
scrambler from listening in on the conversation.
This low security form of encryption is sufficient to make speech unintelligible to other casual
listeners, however it does not offer high level security as other radios programmed with a
scrambler function will be able to unscramble it.
Supported in analog mode only.
The speaker sounds a ‘bip-bip’ tone when PTT is pressed to indicate that scrambler is active. The
Scrambler On/Off state is reset to Off at power-up and channel change.
A first press of the function key enables scrambler mode.
A second press restores the channel to normal (clear) mode.
7.15. SKIP
The Skip function key is used to temporarily remove members from a scan channel. The removal
is temporary only until the channel is changed.
7.16. SQUELCH
The squelch mode is used to selectively receive P25 signals. It has three modes,
Monitor
,
Normal
and
Selective
. When set to
Monitor
, all P25 traffic on that channel will be heard,
subject to presence of encryption.
Normal
mode will hear all P25 traffic with the correct NAC
code.
Selective
mode will only receive calls to the channel default talk group and individual calls.
7.17. TALK AROUND
On a repeater channel only, this function key allows the radio to transmit on the base station’s
output channel, so the user can talk directly to other mobiles on the channel, while the repeater
is out of service or out of range.
When the key is pressed again (or the Channel is changed) the mobile’s transmitter channel
reverts to its normal setting.
Talk Around mode is indicating to the user by a double beep at the start of each PTT.
7.18. ZONE
This function provides a shortcut to the detailed Zone menu.
