Owner`s manual

page 3 RITRON, INC. 1-800-USA-1-USA (1-800-872-1872)
Have questions? Call 800-USA-1-USA (800-872-1872) or visit our website at www.ritron.com
OPERATION
SCAN CHANNEL OPERATION
Channel scanning allows you to listen to broadcasts
on your radio channels. The JMX "D-Series" (except
JMX-111D) will scan all channels programmed into the
radio with the exception of the NOAA Weather Chan-
nel, refer to page 6.
How Scanning Works
Using the Channel Selector button, select the Scan
Channel. The radio sounds the Scan Beep, and then
repeatedly checks each channel in the scan list. The
channel display will show the channel numbers as
they are scanned.
When receiving a call on a channel being scanned, the
radio will stop scanning to let you hear communica-
tions on that channel. After the transmission has
ended the radio will pause before it resumes scanning
to allow you time to respond.
When transmitting from the Scan Channel, the
handheld will go to the last channel on which a signal
was received, then transmit. After you release the
PTT the radio will pause to allow time for a response,
and then resume scanning.
Busy Channel Blocking
If one of the channels in the scan list is so busy that
you want to temporarily block it out, press the
Channel Selector button while the radio is stopped on
the channel to be blocked and hold it until scanning
resumes. The blocked channel will now be skipped in
the scan list. The blocked channel will be returned to
the scan list if the radio is turned off, or when the
radio channel is changed using the Channel Selector
button. Channel 1 cannot be blocked.
Last Channel Scanned Alert Tone
When changing channels with the Channel Selector
button, an alert tone will sound to indicate the last
channel that received a message when the radio was
scanning. This will identify the channel on which the
last message was received, and allow uninterrupted
transmission on that channel without the constraints
of scanning. You can then press the Channel Selector
button to return to the Scan Channel.
Priority Scanning (Optional)
The JMX-144D/446D/444D radios can be option-
ally programmed for priority scanning. Priority
Scan allows you to periodically monitor a Priority
Channel, even if the radio has stopped on another
channel. This will prevent missed calls on the pri-
mary operating channel when in scan mode.
With Priority Scan enabled:
 The first channel in the scan list is the Priority
Channel.
 The radio checks the Priority Channel every two
seconds to check for activity. This time is
programmable and can be set for 1 - 8 seconds.
 The radio can be programmed to transmit only
on the Priority Channel when scanning, if
desired.
 The radio can be programmed to sound a
Priority Channel Beep whenever the radio
receives on the Priority Channel when scanning.
See your Ritron dealer or contact Ritron directly for
PC programming of this option.
page 5
ADDITIONAL FEATURES
The JMX "D-Series" handheld radios have other features
available through PC programming. See your Ritron dealer
or contact Ritron directly for PC programming of these
option.
 Receive and Transmit Frequencies not contained
in Frequency Code Table 1, page 9.
 Wide or narrow band transmit operation can be
set per channel.
Additional PC programmable features available to models
JMX-144D/446D/444D ONLY include:
 Scan Channel Options include scan resume delay
time, busy channel blocking, last active channel beeps,
and priority scanning options.
 Squelch Tightener Receiver carrier squelch can be
adjusted UP or DOWN.
 Transmit Power (JMX-144D and JMX-444D Only)
 Transmit Time Out can be changed or disabled.
 Monitor Lock Out can be set to prevent monitoring
of the channel, only broadcasts with the correct QC or
DQC code can be heard.
 Transmit Inhibit on Busy Channel can be set to
prevent transmitting when a broadcast is present on
the receiver that does not carry the correct code.
 Receive Squelch Tone sounds at the end of each
received transmission.
 Transmit Clear To Talk Beep sounds after the PTT
has been pressed.
 Power Saver time can be set or disabled.
 Field Programming can be disabled.
 4-Hour Inactivity Turn-Off The radio can be set to
turn off automatically if not used for over 4 hours.
 2-Tone Encode and Decode The radio can be
programmed to send and receive 2-tone paging.