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4
TRANSMIT
Normally, you should not transmit until the channel is
quiet. This can be determined by monitoring the channel
prior to transmitting.
To transmit - hold down the Push-To-Talk button and with
the radio four inches away talk into the microphone.
Speak in a normal tone, since talking louder will not
improve the listeners reception.
Keep talk times as short and infrequent as possible to
conserve battery, minimize radio frequency exposure,
and allow others to use the channel.
RADIO ALERT TONES
The handheld responds to certain instructions by
sounding a beep or series of tones. These tones can tell
you that the radio is working as you expect.
Power On/Self Check OK
When it is first turned on, the radio runs a quick self
test to confirm basic functions. When complete the
radio will emit the channel beep and the Channel
Display will show the operating channel. The radio is
then ready to use.
Error Tones
However, if the self test detects a diagnostic
error, an error tone sounds. The error tone
indicates the radio frequency synthesizer is
malfunctioning. Turn off the radio and try again.
The error tone will also sound if a channel has been
programmed for an invalid frequency. A long, low-
pitched tone means the battery voltage is too low to
operate the radio. In this case, recharge the
battery. If you cannot correct a problem, consult an
authorized Ritron service facility or Ritron.
OPERATION
Channel Select
When the Channel button is pressed, the radio will emit
a short Channel beep, increment the channel, and the
channel display will show the new operating channel.
Scan Channel
When the Scan channel is selected by pressing the
Channel button, the radio will emit the Scan beep and
begin scanning.
Tone Squelch
When you press and hold both Volume buttons at the
same time, a single beep will sound to indicate that
tone squelch is on. A double beep means that
carrier squelch is on.
Recharge Battery Alert
As the battery voltage approaches the minimum
required operating voltage the radio will emit a short
beep every 20 seconds to alert the user that the
battery will soon need recharging. Once the battery
charge drops below the required operating voltage,
the radio emits a long, low tone and turns itself off. If
you turn the radio back on, it will beep again and shut
itself off. Recharge the battery.
Transmitter Time Out
A low tone followed by a higher-pitched tone sounds
and the transmitter automatically shuts off if you hold
down the PTT button longer than 60 seconds. The
radio automatically switches to receive mode.
OPTIONAL ALERT TONES
JMX "D-Series" models JMX-144D, JMX-446D and JMX-
444D can be programmed using the RITRON PC
Programmer for optional alert tones. See your Ritron
dealer or contact Ritron directly for programming of these
options.
Courtesy Beep
A short tone sounds at the end of each received
transmission to indicate that the channel is clear and
you may transmit.
Busy Channel TX Inhibit
If a user is transmitting on your radio frequency
without your tone, you will not be allowed to transmit.
The radio will beep a series of long, low tones while
the PTT is held down (like a busy signal).
Transmit Clear To Talk Beep
A short tone sounds after the PTT has been pressed
to indicate that the radio is ready for you to begin
talking.
FIG-2: TRANSMIT / BUSY LAMP
A Transmit / Busy
Lamp in the upper
left corner of the
Channel Display
is lit whenever
the transmitter is
activated and
blinks when the
channel is busy.
