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External sockets
External loudspeaker
Depending on the surrounding noise, it can be advisable to hook up an external
loudspeaker. Usual commercial radio loudspeakers with 4-8 ohms impedance and 2-
4 W minimum output can be plugged in.
The cable can be up to 3 metres long. For car loudspeakers, make sure to use a
two-pin 3.5 mm jack plug and ensure that none of the loudspeaker connections are
attached to the vehicle chassis.
External S-meter
On the back, your AE 5090 has an S-Meter socket on the rear side, which allows you
to connect up an external S-Meter to show the relative signal strength. This gives
more exact information than the bar display. Please ask your authorized dealer
about external S-meters. The S-meter should be installed near the radio set using a
cable no longer than 3 metres. You need a 2.5 mm jack plug to connect it up. The
polarity is positive, i.e. the positive pole of the S-meter is connected to the inner pin,
and the negative pole is on the outside.
Microphone socket
The 6-pole microphone socket on the front side is wired according to the well-known
Albrecht specifications, which also meet the recommendations issued by the German
manufacturers of CB radios.
Apart from the rugged dynamic “Trucker microphone” included in the package, you
can also hook up other microphones and accessories.
The microphone socket has been tested and is suitable for nearly all kind of
microphones, even those with amplifiers or selective calling devices. According to
the latest regulations you are also allowed to plug in modems or so-called TNC`s for
data transfer (Packet Radio). However, this type of data transfer is only permitted on
certain channels and only for non-commercial use.
Special regulations apply to data transfer abroad. In Switzerland, for example,
Packet Radio is permitted on channels 21-25, but only with a call signal granted by
the authorities. In some other European countries Packet Radio is not allowed at all.