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Level 0 will disable the squelch function and the radio will receive
all background noise on that frequency at all times. You can set
up the appropriate squelch level via software according to the
current communication environment and requirements.
Factory programmed on Squelch level 5
Squelch Level Checking
Either side key can be programmed to enable this function. When
you press the side key to check the squelch level, the radio will
indicate the level 1-9. There will be no indication if the squelch is
at level 0 as it is disabled.
Time-out Timer
The purpose of the Time-out Timer is to prevent any person
jamming up a channel for a long time whilst transmitting. If the
time that you continuously transmit exceeds the set Time-out
time, the transceiver will stop transmitting and a tone “beep” will
sound. To stop the tone, release the PTT switch. You can press
the PTT switch again to resume transmitting.
Note:
you can set up the time level: OFF, 30s, 60s, 90s …… 300s
Factory programmed on TOT 90s
Tones
Some channels may have pre-programmed CTCSS/QT/DQT
tones. A CTCSS/QT/DQT tone is a sub-audible tone which allows
you to ignore (not hear) calls from other parties who are using the
same channel. When you receive a signal that has a tone
different from the one set up in your transceiver, you will not hear
the signal. Likewise, signals that you transmit will only be heard
by parties whose CTCSS/QT/DQT tone matches the tone set up
in your transceiver. There are 38 standard CTCSS tones (see
table for allocated tones), 12 QT and 104 DQT which can be
selected per channel.
Note:
Although using channels set up with CTCSS/QT/DQT tones relieves
you from listening to unwanted calls; it does not mean your calls will be
PROFESSIONAL TWO-WAY RADIO
24
totally private.
Scan
Either side key can be programmed to activate / deactivate this
function. The scan function is useful when you want to find other
people on similar frequencies or to monitor communication within
your group. If an active channel is found the scan will stop and
lock on to that channel. You can now transmit and receive on this
frequency. When the signal is gone for 5 seconds, scanning will
resume. The radio will announce which channel of the possible
16 programmed channels has been received. This is very useful
when monitoring a large number of channels and responding to
the correct channel.
Priority Scan
Normal scan will sequence through all the channels in order until
a signal is detected. Priority scan allows one channel to be
checked more often which is useful when there is one main or
more busy channel.
For example: If CH2 is set as a priority
channel. So the scan method will be:
Normal scan
is CH1, CH2, CH3,
CH4……According to the sequential scan.
Priority scan
is CH1, CH2, CH3, CH2, CH4,
CH2…… checks same channel in between
others.
Scan Modes
There are two modes of scanning depending on the user’s type
of communication.
Carrier:
Scan will stop and lock when a signal is received and
continue scanning after the signal has gone for 5 seconds.
Time:
Scan will stop when a signal is received and continue
scanning 5 seconds later.
Summary of Contents for ZA-758
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