Power Supply - stabo xm 3006e VOX 12/24 Bedienungsanleitung

Tuning the antenna
Do not under any circumstances transmit without the antenna as this will destroy the
device.
Tuning the antenna means that your antenna is adjusted to the output impedance of the
transmitter, i.e. 50 W.
The actual wave impedance of the antenna does not only depend on its length but also
on the environment in which it is installed. Therefore, the manufacturer can only supply a
roughly tuned antenna. In general it is constructed so that there is always enough margin
for calibration to the existing conditions. In practice this means that a new antenna is usually
too long.
To tune, loop in a VSWR testing bridge (e.g. President TOS-1, art. no. 50004) between
the stabo xm 3006e VOX 12/24 and the antenna and shorten or extend the antenna in
accordance with the manufacturer's specifications so that the VSWR is as low as possible
on your favourite channel or one of the middle channels. To do so, set FM modulation in
order to work with a constant transmission power when measuring.
You should in any case achieve a value of ≤ 1:2.0. However, it is not of any use to aim to set
a value of 1:1 for mobile operation as other environments, changes in the cable etc. can
change this value again anyway. We do though recommend that you check the tuning
regularly because a poor value is an indication of problems with plug connectors and cables.

Power supply

Your radio device is supplied with a maximum of 26.4 volts DC voltage. It is equipped with
reverse polarity protection.
Nevertheless, you should make sure that the polarity is correct! Reversing the polarity
will destroy your CB radio device.
The supply voltage must not under any circumstances exceed 30 V.
The negative pole is connected to ground (= chassis), like on practically all modern cars.
Before connecting, check the polarity and the voltage: on older cars the positive pole may be
connected to ground. In case of any doubt consult a specialist workshop.
Once you have made sure that the voltage and polarity are correct, proceed as follows:
a) You radio device is supplied with a cable for the power supply (A) with a 5 A fuse in the
circuit. Connect the free ends of the power supply cable directly to the respective terminals
on the battery:
Red = positive pole, black = negative pole (ground).
b) Connect the cable directly to the vehicle battery. If connected, e.g. to the cigarette lighter,
the radio device would no longer be supplied with the necessary buffer voltage once the
ignition is switched off.
c) Route the power supply cable in the car so that it can absorb as little interference from the
ignition system as possible.
CAUTION: If the fuse in the power supply cable
blows: a) locate and eradicate the cause,
b) replace it with another 5 A fuse.
Always switch off the device before you exit the
vehicle so that you do not find an empty battery
next time.
To the engine
starter
19
To the chassis