OPERATION
DIGITAL QUIET CALL
Digital Quiet Call is RITRONs tradename for digital coded squelch. DQC works
the same as QC, except that a digital code is applied to the broadcast. Radios
programmed with the correct code "recognize" the incoming broadcast and
allow the message to be heard.
PAGING QUIET CALL
General
Paging Quiet Call (PQC) is RITRON's tradename for its selective paging system.
Each radio or group of radios may have a unique PQC code. Any channel that
contains an operating frequency can be programmed with one of these codes.
(A channel programmed with PQC may also contain a QC code.) With a PQC
channel selected and coded squelch on, the radio stays quiet until it receives the
correct PQC code. A ringing tone announces an incoming call.
Each Paging Quiet Call code is broadcast as a unique pair of audible tones, with
the first tone sent for one second, and the second tone for two seconds. PQC
codes can be originated by a base station paging encoder, a telephone (via a
RITRON RR-454 Repeater Plus/RP-200 system), or a RPM mobile equipped
with a Touch Tone hand microphone.
The All-Call Code
Radios operated with PQC respond to a special All-Call code, as well as to their
individual codes. This allows one page to be heard by all "PQC units" on the
channel. The standard RPM mobile radio can transmit an All-Call page.
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HOW TO:
Send An All-Call Page -
1) Select a channel programmed with Paging Quiet Call.
2) Turn off the radio.
3) Press and hold the microphone PTT button while switching on the radio.
Keep holding down the PTT. A continuous tone will sound.
4) Release the PTT when you hear alternating tones.
5) Hold down the PTT again and deliver your message.
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WHAT THE RADIO TONES MEAN
The RITRON RPM mobile responds to certain instructions by sounding a tone or
series of tones. These tones can tell you whether the radio is working as you expect.
POWER ON/SELF CHECK "OK"
Switch on the radio by rotating the on-off/volume knob clockwise out of the "click"
position. The mobile then runs a quick "self test." When the internal system checks
verify basic operation, a brief tone sounds that means the radio is ready to use.
ERROR TONES
However, if the self test detects a diagnostic error, an error tone sounds. One low-
pitched tone means that the radio microcontroller is not working as it should.
Alternating tones (the second is lower pitched) indicate that the radio frequency
synthesizer is malfunctioning. If you get one of these messages, turn off the radio
and try again. If the problem continues, consult an authorized RITRON service
facility or the RITRON Repair Department.
Repeating error tones occur if you press the microphone Push-To-Talk button while
a "Receive Only" channel is selected. The radio will not transmit because a "Receive
Only" channel does not contain a transmit frequency. The error tone repeats until
you release the PTT.
One low tone sounds and the transmitter automatically shuts off if you hold the
PTT down continuously for a specified time (normally, 3 minutes). This transmitter
time-out feature may be turned off or adjusted by authorized service personnel.
CHANNEL SELECTION
The RPM mobile provides 16 channels, each of which may be "dealer or factory"
programmed. The first ten channels appear on the channel display as 0 through 9.
The next six channels are A through F (with b, c and d shown as lowercase letters).
You can move forward or backward through the channels. Pressing and releasing
the channel button advances the digital display to the next programmed channel
(any empty channels are skipped). Pressing and holding the channel button while
toggling the monitor button decreases the channel number. Each time you select a
channel, the radio emits a short tone, providing an audible marker. Additionally,
when the channel number "rolls-over" from the highest to the lowest programmed
channel number, a "double tone" sounds. This allows you to select channels with-
out looking at the radio (useful if the mobile is installed under the driver's seat).
OPERATION
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