Buttons On The Right; Select Modulation Mode: Am Or Fm - Albrecht AE 6790 Operación Manual

way you keep channel 9 free for other calls. An emergency channel only works if
many stations are listening. Frequently listen to this channel; the channel 9 buttons
helps. Press the CH 9 button again to return to the previously used channel.
In AM this channel is also used by all truckers.
FRQ This function toggles between the common channel number display and
frequency display.
LOC Receiver sensitivity selector
Press the FC button, then press LOC ("local" = reduced sensitivity for close range,
LOC is displayed). Press FC + LOC again to deactivate the function, LOC turns off
and the device has again its full sensitivity.
On/Off switch, press and hold for approx. 2 seconds.
FC Function button for some secondary functions. Combined with VR knob. Press the
VR button once = secondary function, then press the desired function button.
BP Press and hold VR button: Key beep tones on/off.
Traditional CB radio started in the US with 23 channels and the classic modulation mode AM, like
amateur radio, sea radio a commercial radio stations in the 1950s and 1960s. Today AM can be
found in medium wave and short wave radio stations and in aircraft radio. For commercial radio
today only FM is used and for short wave long-distance traffic SSB (single sideband AM). In
Europe authorities early restricted CB radio to replace the traditional AM modulation with the
interference-free FM modulation. Despite all this especially truckers clung to the old CB traditions
and until today use amplitude modulation; this actually has some advantages compared to FM with
the less interfering truck diesel engines: a less aggressive sound for the human ear and less noise
on unused channels during reception.
Long lasting demands of CB radio operators were finally acknowledged:
More and more EU countries permitted AM again, mainly even registration and license-free, since
the suspected noise caused by AM disappeared; the previous "problem children" such as stereo
equipment, VCRs or broadband antennas interference resistance has significantly improved during
the past years with digitization in TV and satellite technology. The new European standard again
permits AM with full transmission power (4 Watts).
Press the A/F button to toggle between AM and FM (the mode is displayed). For Austrian FM
devices this button is invalid.
You can only transmit in AM with your radio if you have programmed the 80/40 or 40/40 mode
and if you select a channel, where AM is permitted for transmission.
As soon as you try to switch to one of the channels 41 to 80 on AM, the device switches to 40-
channel AM mode with channels 1-40 (and vice versa for German setting).
Both modulation modes have their own channel setting, so that after switching always the
previously used FM or AM channel is selected.

Buttons on the Right

Select Modulation mode: AM or FM?

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