20
Squelch/SQ
The xm 5006e features a function for noise suppression (squelch) suppressing the reproduction,
if the signal is lacking or too weak. Use the SQ/ASC control to adjust the signal level at which
the function is activated.
The SQ/ASC control is the outer knob of the double potentiometer.
By turning the knob to the left, the signal level is reduced, by turning the knob to the right, the
signal level is increased. With constantly varying conditions of reception, as for example during
mobile operation, a frequent adjustment of this level can be necessary.
(A)utomatic (S)quelch (C)ontrol
The ASC function is a patented function elaborated by the resident Electronics SA France group.
This function evaluates the so-called signal-to-noise ratio (ratio between the useful signal and the
interfering 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. Furthermore, ASC appears on the
display.
Choosing the type of modulation (AM/FM)
In all frequency tables (except EC) you can either operate your radio set in FM or in AM modulation.
Frequency-modulated signals (FM) are less sensitive to interferences resulting from the ignition
system etc. than amplitude-modulated signals (AM). The decision, which type of modulation is
your preferred one, depends on your radio contact partners and on your and/or the legal requirements.
If your loudspeaker emits an unintelligible, distorted signal, you should try receiving the signal
using a different type of modulation. You can change the type of modulation by pressing the
AM/FM key.
(N)oise (B)lanker & (A)utomatic (N)oise (L)imiter (NB/ANL)
Both circuits are used for suppressing interference and are indicated as NB/ANL on the display
when activated.
While ANL only functions in AM mode suppressing above all interferences resulting from generators,
NB functions in AM and FM mode suppressing above all impulse interferences as e.g. interferences
of the ignition system.
Receiver low-pass filter (HI-CUT)
In addition to the noise attenuators ANL and NB, stabo xm 5006e is equipped with a receiver low-
pass filter. When the reception quality is poor due to background noise, this filter is able to improve
the subjective hearing quality by filtering high frequencies occurring above all in background noise.
The display shows HI-CUT when the filter is activated.
Direct access to channels 9 and 9 (CH 9/9)
The AM channel 9 is internationally used as emergency call and as truck driver channel especially
in Germany. Outside Germany, channel 19 is used as trucker channel. However, both types of
modulation are used for this purpose. Thus, in case of an accident or another emergency, you
hopefully should be able to quickly appeal for help using these channels. For being able to transmit
an urgent appeal for help as fast as possible in such an emergency situation, your stabo xm 5006e
features an extra key for directly accessing these channels (CH 9/9). Thus, pressing this key
once activates channel 19, by pressing this key once again, channel 9 is activated. By pressing
the key once again, the radio set returns to the channel left.
When directly accessing the channels 9 or 19 using the key CH19/9, the display shows EMG
(Emergency) as mode of operation.
Note: In EMG mode, the type of modulation is automatically changed, when the channels 19
and/or 9 are used depending on the selected channel configuration.