25
Operation
The operation of the stabo xm 3003 is almost self-explanatory.
After having established all connections, switch your CB radio set
on by using the left rotary knob (ON/OFF/VOL) which is also used
for setting the volume. First, the country code should be displayed
for three seconds, afterwards a channel should appear in the
display. If the display does not light up, please check the power
supply and the fuse. A noise should be audible in the loudspeaker.
Failing this, check the microphone for proper connection and turn
the median rotary knob (SQL/ASC ) counterclockwise until a noise
can be heard. The RF Gain control should be set to the rightmost
position.
Reception
Channel selection (4)
Using the big rotary knob on the right (4), you can adjust the
requested channel which you wish to use for hearing. With the
microphone connected and the volume control adjusted to a me-
dium volume, the squelch control (2) (SQL/ASC) should be adjusted
such that a noise can be heard if the antenna is connected.
Squelch (2)
Each FM radio set and consequently the stabo xm 3003 as well
features a function for noise suppression (squelch) suppressing
the reproduction, if the signal is lacking or too weak. Use the
SQL/ASC control (2) to adjust the signal level at which this function
is activated.
With constantly varying conditions of reception, as for example
during mobile operation, a frequent adjustment of this level can
be necessary.
ASC (Automatic Squelch Control) (2)
The ASC function is a patented function elaborated by the President
Electronics SA France group. This function evaluates the so-called
signal-to-noise ratio (ratio between the useful signal and the inter-
fering signal). The useful signal is only forwarded to the loudspeaker,
if it is worth being received, i.e. it is almost free from noise. Thus,
a permanent readjustment, as for the squelch function depending
on the field strength, is not necessary. This is of benefit to a safe
participation in the street traffic when driving. The ASC function
can be used for AM and FM mode and is activated if the squelch
control is set to the leftmost position.
RF Gain control (3)
With the AM type of modulation, the signal can be distorted, if the
signal level (S value) is too high. In this case, use the RF Gain
control to reduce the amplification.
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