230V Operation Via Power Adaptor; Antenna Connection - Rear - Albrecht AE 6891 Guide D'utilisation

regulations for "normal" vehicle electric consumers such as car radios, cooler boxes or coffee
machines, this frequently is not sufficient for undisturbed CB reception, since CB radios
feature highly sensitive receivers. We cannot guarantee flawless CB reception during
switching converter operation and in vehicles with board computers.
Problems cannot be avoided in all cases without trials. It is also important that the aerial is
located as far away from other aerials and from the converter wiring as possible and has a
good grounding surface. Contrary to mobile phone and car radio antennas conventional CB
aerials cannot be installed on plastic surfaces, unless a metal foil is at the bottom
side. Ground connection is especially important for CB radios. In case the truck still has a
metal mirror holder, the foot can be attached here with an angle mount, but not e.g. on a
pure GRP roof or GRP spoiler. If the antenna cannot be installed on a conductive surface,
our floating ground CB mobile antennas such as GL 27 are available.

230V Operation via Power Adaptor

In case you operate your radio at home, use a specially stabilized CB radio power adaptor to
supply at least 1.5-2A at 12-13.8VDC. A suitable power adaptor is the Albrecht order no.
4744. Non-stabilized power adaptors, battery chargers or popular cooler box adaptors are
not suitable for CB radio and should not be used. Switching power adaptors can only be
used in connection with an external antenna for CB radio, which does not receive the
interferences of these power adaptors. Connect the positive cable (red) to the positive
terminal (+) of the power adaptor, the black cable to the negative terminal (-) of the power
adaptor.
Antenna Connection – Rear
Antenna (PL259)
Ext. speaker
12VDC cable
Ext. S meter
Connect your CB antenna via PL connector to the 50 Ohms antenna jack at the rear of your
AE 6891. For best range the antenna must be adjusted for CB radio. Use a standing wave
meter to check and to adjust the antenna. Adjust the antenna for best standing wave ratio on
a medium channel. If you are using 80 channels optimize on channel 1, for 40 channels on
channel 20 and for truckers we generally recommend channel 9.
On this channel you should achieve a standing wave ratio of approx. 1.5 or less. Even if the
standing wave ratio on the highest (channel 40) and lowest channel (1 or 41) deteriorates up
to 2, your antenna is still suitable. If the standing wave meter shows a value in red (SWR >
3), already more than 25% of the transmission power is lost due to modulation losses. Poor
SWR can also be a sign for a defective antenna, cable or short-circuit in the antenna
connector! Otherwise optimize your antenna on the channel you use most.
Dealers also offer broadband antennas such as Gamma II, where no adjustment is
necessary. Your dealer offers inexpensive standing wave meters such as the Albrecht SWR
30, order no. 4412.
By the way: Even with your AE 6891 featuring an especially robust final stage, which can
even cope with maladjustments of SWR = 3, you should never transmit without antenna!
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