Midland Radio SP-410 - Manual (Page 20)

SP-400 Series User’s Guide

The radio might be programmed with a timeout timer
which will automatically end your transmission after a
preset time. In this case release PTT and wait for a few
seconds. The radio transmitter will be enabled again
after a few seconds. Ask your dealer or communications
coordinator for further details.

The radio might be programmed for busy channel lock
out, which automatically disables the transmitter if your
channel is busy. In this case wait until the channel is
clear.
Selecting transmission power
Your SP-410 / SP-420 / SP-430 / SP-440 can transmit with two
power levels. This setting is programmed by your dealer or
communications coordinator for each channel. The low power
option is used whenever possible to extend battery life and
reduce the chances of creating interference with nearby radios.

If the status LED blinks red once every five seconds in
standby, the battery needs charging. When a low battery
condition is detected, the radio will automatically revert
to low power when transmitting to help prolong the
battery's life. If beeps are enabled, two short beeps will
be heard before each transmission indicating the radio
has automatically switched to low power mode.
Sending a 2-tone/selective call or emergency call
Your radio may have been programmed to send a 2-tone or
selective call for the current channel. Your dealer or
communications coordinator may have programmed your radio
to send an emergency call. Please consult your dealer or
communications coordinator if you are not sure about the use of
the call function. Obviously, you should not send an emergency
call unless it is warranted.
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© 2005, Midland Radio Corporation