Midland Radio SP-410 - Manual (Page 18)

SP-400 Series User’s Guide
2-tone/selective call operation
2-tone or selective call signaling allows individual or group calls
to be made to your radio. The radio may have been programmed
to mute all receive signals until a 2-tone or selective call signal
has been decoded. When the programmed 2-tone or selective
call signal is decoded, the status LED will blink green, a ring tone
may sound, and subsequent receive audio will be heard over the
speaker. After the call has been acknowledged, by pressing PTT
for example, the status LED will change to steady green until the
radio is muted. The transceiver may be programmed to mute
after a programmed time, or you may press and hold the upper
function button for two seconds to mute the radio until it receives
a new call.

Consult your dealer or communications coordinator for
further details on how your radio has been programmed
for 2-tone or selective call operation.
!
2-tone and selective call signaling allows users to
receive only calls intended for them. However, more
than one radio transmitting at a time will still cause
interference. Do not transmit if the status LED is
illuminated. Wait until the channel is clear before
transmitting.
Monitoring the channel
The upper function button is used to activate the monitor
function. The radio’s monitor function can be programmed per
channel and may operate differently on different channels. It may
also be disabled on some channels. The following paragraph
details the basic monitor function, but consult your dealer or
communications coordinator if you are unsure how the monitor
function operates.
The monitor function may be programmed to disable squelch,
CTCSS/DCS signaling, 2-tone/selective call signaling or some
combination of these. To temporarily activate the monitor
function, briefly press the upper function button. If the button is
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© 2005, Midland Radio Corporation