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13
BASIC OPERATION
Power On/Off
Turn the Power Knob (also called Volume
Knob) clockwise to switch on the radio; you will
hear a “di” sound and a voice message will
indicate the current channel number. Turn
counter-clockwise to switch off the radio. (see
Figure1)
Adjust the Volume
Press the programmed SK1 “Monitor” key or
“Squelch Off” key to listen the background
noise, and then turn the knob to increase or
decrease the volume. (see Figure2)
Select a Channel
Turn the Channel Selector Knob to select your
desired channel. If the Voice announcement
function is enable, your radio will automatically
report the channel No. where the knob locates.
(see Figure 3).
Refer to the factory channel settings when
linking your radio to other radios as it may be
necessary to reprogram or adjust the
frequency / sub tone to match.
Transmit
Keep pressing down the PTT key and speak
directly into the microphone (MIC). Hold the
radio about 2.5cm to 5cm from your mouth.
(see Figure 4). The radio should be held so
that the antenna is vertical.
Receive
Release the PTT key to receive a call and
PROFESSIONAL TWO-WAY RADIO
14
and adjust the volume if needed.
Communication Range
Range will depend on the type of terrain that you are
communicating across.
The ZA-758 uses the UHF (Ultra High Frequency) band and will
be subject to similar obstacle interference as cellular phones. The
radio works indoors as well as outdoors. Typical rough estimate
ranges for different terrains are:
Indoors or Shopping centre 300m-1200m
Building 5-30 stories,
City centre & dense bush 500m-2km,
Residential & over water 2-6km,
Farmland 3-7km,
Top of mountain or building (line-of-sight) 10-30km.
When you press the PTT talk button a signal is transmitted and
the signal floods the area in all sideway directions. The signal
travels in 3 different ways:
1) Penetration: The signal can go through materials such as
wood, plastic, cement and fabric. The denser the material or
more built up the environment the weaker the signal will
become. The signal cannot go through solid metal or very
large solid land structures such as a hill or mountain. Metal
acts like a shield and that is why the performance from the
inside of a vehicle (car or 4x4) will be less than outside and a
external car antenna kit is recommended to improve
communication.
2) Reflection: The signal cannot go through metal or very large
structures such as a hill or mountain, but it can bounce off (like
a mirror), go around and reflect in other directions as well. This
happens at the speed of light.
3)Line-of-sight: Line-of-sight is when there are no obstructions in
the path between the communicating parties. The higher up
you go the further you can see, so the larger the line-of-sight
Summary of Contents for ZA-758
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