Type of modulation (7)
Using the adjustments 40/40 and 80/80 you can either operate
your radio set in FM or in AM modulation. The decision, which of
both types of modulation is your preferred one, depends on your
radio contact partners and on your requirements. However, please
keep the compulsory registration for AM mode in mind which
applies in many countries!
Generally speaking, frequency-modulated signals (FM) are less
sensitive to interferences resulting from the ignition system etc.
than amplitude-modulated signals (AM). If your loudspeaker emits
an unintelligible, distorted signal, you should try receiving the signal
using a different type of modulation.
For changing the type of modulation, actuate the left of the three
available sliding switches (AM/FM). To the right below the channel
display, an individual LED lighting up when the FM mode is activated
is positioned.
Channel 9 (8)
The AM channel 9 is internationally used as emergency call and
truck driver channel. Thus, in case of an accident or another
emergency, you hopefully should be able to quickly appeal for
help using this channel. For being able to transmit an urgent appeal
for help in such an emergency situation as fast as possible, your
stabo xm 3003 features an extra switch for this channel.
The switch is the right one of the three sliding switches and is
marked by CH 9. When switching over, please pay attention to
the adjusted type of modulation.
Signal intensity (5)
A bar display can be seen to the left next to the channel display.
During reception, this display shows the signal strength in S-grades.
The S-grades 2, 5, 7 and 9 are indicated. Values above S9, 9+10
and even higher are indicated as S9. In this case, the received
signals are very intensive and are transmitted by an adjacent radio
station.
Transmission
For transmitting, you just have to press the push-to talk button
on the left side of your microphone and to speak with normal voice
level into the microphone. Dont speak to loud such that the sound
of your voice is natural for your radio contact partner. We
recommend you to test this and to ask for a modulation report
afterwards. However, please keep in mind that you should not
transmit without connected and adapted antenna, since this would
dammage your radio set.
Before starting the transmission, wait for a moment to make sure
that the channel is free and that there is no doubling with a
different radio station. Furthermore, please note that the radio
station need a certain time to carry out its start-up sequency. Thus,
you should better wait for a second before speaking.
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