User's Manual

6
Transmit
CAUTION
OPERATION OF THE TRANSMITTER WITHOUT
A PROPER ANTENNA INSTALLED MAY RESULT IN
PERMANENT DAMAGE TO THE RADIO
1) Press the monitor button to monitor the channel for activity. To avoid interrupting another user, make
sure the channel is clear before you begin transmitting.
NOTE: Federal Communications Commission Rules and Regulations require that you monitor a channel
for activity before transmitting.
NOTE: The tri-color LED located on the top panel can help with channel monitoring. It will glow amber if
RF activity is present; or green if the transmission has a CTCSS or DCS or DTMF tone that matches a
tone programmed for receive in your radio. When this LED is not illuminated, the radio is indicating a
"clear" channel.
2) When the channel is clear, hold the radio upright with the antenna vertical and the front microphone area
about 1 inche from the mouth, keeping the antenna away from the face and eyes. Press and hold the P-T-T
bar on the side of the radio, and speak slowly and clearly into the microphone area.
NOTE: The LED will glow red when transmitting. This indicator should be on continuously while the P-T-
T bar is being pressed and the radio is transmitting. Should the red LED be "flashing", the battery needs to
be recharged and transmission will cease. Recharge the battery before attempting more than one
transmission.
Receive
When you have finished transmitting, release the P-T-T bar to receive.
Power Off
When finished transmitting, receiving, monitoring, etc., turn the radio off by rotating the on/off-volume
control fully counter-clockwise, to the detent position.
Status Indicators and Audible Alert Tones
Your SP-510 has a sophisticated microprocessor control which provides a series of audible alert tones.
Upon initial power up, a quick melody indicates that the self-test of
the microprocessor functions has been completed satisfactorily. A series of tones may be sounded with any
of the following conditions:
· Attempt to transmit on a channel set for receive only
· Attempt to transmit on a channel that is already in use when busy channel lockout has been programmed
into the radio *
· Transmitting time has exceeded time-out timer programmed length *
· Low battery condition
· Selecting a channel with no programmed frequency
* Indicates a function that is initially programmed into the radio by your Maxon Dealer.