User guide

7 Using a PMR device
To communicate between PMR devices they need to be set all on the same channel and
CTCSS / DCS code (see chapter “13.7 CTCSS (Continious Tone Coded Squelch System) /
DCS (Digital Coded Squelch)” and within receiving range (up to max. 10 km in open field).
Since these devices use free frequency bands (channels), all devices in operation share these
channels(total 8 channels). Therefore, privacy is not garanteed. Anybody with a PMR set to
your channel can overhear the conversation. If you want to communicate (transmitting a voice
signal) you need to press the PTT-button 12 .
Once this button pressed, the device will go into transmit mode and you can speak into the
microphone. All other PMR devices in range , on the same channel and in standby mode (not
transmitting) will hear your message. You need to wait until the other party stops transmitting
before you can reply to the message. At the end of each transmission the unit will send a beep
if the Roger Beep is enable (see chapter “13.12 Roger Beep On/Off” ). To reply, just press the
PTT-button 12 and speak into the microphone.
MTD90
LICENCE FREE 2-WAY RADIOS
Page 4
8 Included in the package
• 2 x MTD90
• 2 x Desktop Charger
• 2 x Power adapter
• 8 x AAA NiMh batteries
• User guide
If 2 or more users press the at the same time the receiver
will receive only the stongest signal and the other signal(s) will be
supressed. Therefore you should only transmit a signal
(press PTT-button 12 when the channel is free.
PTT-button 12
The range of radio waves is strongly affected by obstacles such as
buildings, concrete/metal structures, the unevenness of the landscape,
woodland, plants, … This implies that the range between two or more
PMR's may in some extreme cases be restricted to a maximum of a few
tens of meters. You will soon notice that PMR works best when there is
a minimum of obstacles between users.