Albrecht AE 6890 Bedienungsanleitung Seite 35

DIM Toggle switch for the background illumination of the display between 2 brightness levels.
DW Dual Watch: This function is some kind of two channels watch. The radio is switching
between the last manually selected channel and the priority channel PRI, so you can
watch both channels. The watching stops as soon as there is a signal on one channel.
MHz Toggles between Channel and Frequency display
LOC Toggle switch for 2 RF gain steps: between local (LOC on appears shortly in the display)
for reduced receiver sensitivity and full sensitivity (LOC of appears for a moment) for
normal communication distances. Press the switch about 2 seconds to activate or
deactivate the RF gain switching.
CH9 direct dialing key: switches at the push of this button from the last selected channel
directly to channel 9 and back. Channel 9 is the international call- and emergency
channel: especially in Germany this means: on this channel there are many
stations listening. In case of an emergency there are great chances to be heard on
this channel. Also for calling other stations, from which you know they are listening
to channel 9, you can start a call there. Call the desired station. As soon as you got
someone from this station, agree on another channel and move there, so that
channel 9 is free again for other calls. Of course such an emergency channel only
works if there are enough stations who listen. So try to listen to this channel as
much as possible – this direct key helps you. With the next time pushing the CH9
key your radio switches to your last used channel.
This channel is used by nearly all truckers also on AM.
ON-Off Power switch, press 1-2 seconds for on or off.
A/F AM-FM Modulation switch (AM or FM, if activated): with these key you can choose
between AM and FM. The type of modulation will be displayed. The FM radios for
Austria do not have any function on this key.
The traditional CB radio started in the USA with 23 channels and the classical AM
modulation, as it was usual in HAM-radio, air radio and commercial stations in the 50's
and 60's. Today you find AM only in middle- and shortwave and at aircraft radio. In
commercial radio today you only find FM and in short-wave distance radio SSB (one-side-
band-AM). In Europe the authorities intervened rather early and wanted to replace the
traditional AM modulation with the (for transmitter interference) better FM modulation. But
especially the truckers loved the CB traditions und are still using the amplitude
modulation, while the less interfering truck diesel motors even create some advantages
compared to the FM modulation: the sound was not as aggressive and a lower noise on
unused channels.
Meanwhile the administrations reconsidered AM again as acceptable and more and more
European countries allowed AM again, meanwhile mostly without registrations and license
fees.
In AM you can only transmit with your radio, if you have programmed the 80/40 or 40/40
mode and if you chose a channel on which AM is allowed from the transmitting side.
Keys below the Display
Keys on right front panel side
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