Midland Radio SP-410 - Manual (Page 16)

SP-400 Series User’s Guide
Basic Operation
This section describes many of the standard functions available
on your SP-400 series radio. Many aspects of the radio can be
changed or customized to suit the requirements, so not all
functions may be available or operate as described.

Due to the programming options of the radio, certain
functions may be disabled or operate differently than
described here. If in doubt please contact your dealer or
communications coordinator for further details.
Turning the radio ON and OFF
To turn the radio on, rotate the PWR/VOL knob clockwise past
the detent. The CPU will perform an auto test and a ring tone will
sound to indicate the radio is functioning properly.

The power-on ring tone may have been disabled during
radio programming.
To switch the radio off, rotate the PWR/VOL knob
counterclockwise past the detent.
Adjusting the volume
The PWR/VOL knob is also used to adjust the speaker volume:
rotate clockwise to increase or counterclockwise to decrease the
volume.
Selecting the channel
If your radio has been programmed with more than one channel
you can easily change it. To select a channel, turn the channel
selector knob clockwise or counterclockwise until the channel
indicator on the knob matches the desired channel. If the
selected channel has not been programmed, the status LED will
glow steadily green and a low error tone will be generated.
Receiving transmissions from other radios
Each channel of your radio may be programmed for carrier
squelch operation, CTCSS/DCS operation or 2-tone/selective
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© 2005, Midland Radio Corporation