Midland ALAN 8001S User Manual
ALAN 8001S
E N G L I S H
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TABLE OF CONTENTS
Installation ........................................................................................................................ 2
Location ........................................................................................................................ 2
Mounting the Connection ............................................................................................. 2
Ignition Noise Interference ............................................................................................ 2
Antenna ........................................................................................................................ 2
Tuning the Antenna for Optimum SWR ....................................................................... 3
External Speaker ......................................................................................................... 4
Operation ........................................................................................................................ 4
Controls and Indicators ................................................................................................ 4
Front Panel .................................................................................................................... 4
Real Panel ..................................................................................................................... 6
P.T.T. Microphone ......................................................................................................... 6
Operating Procedure to Receive ................................................................................. 6
Operating Procedure to Transmit ................................................................................ 6
Receiving SSB signals .................................................................................................. 7
Roger Beep .................................................................................................................. 8
Alternate Microphones and Installation ....................................................................... 8
Specications..................................................................................................................11
E N G L I S H
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INSTALLATION
LOCATION
Plan the location of the transceiver and microphone bracket before starting the installation.
Select a location that is convenient for operation and does not interfere with the driver or
passengers inside the vehicle. In cars, the transceiver is usually mounted below the dash
panel, with the microphone bracket beside it.
MOUNTING THE CONNECTION
The transceiver is supplied with a universal mounting bracket. When mounting the bracket
and radio inside your car, make sure it is mechanically strong. Also provide a good electrical
connection to the chassis of the vehicle. To mount the transceiver, proceed as follows:
1. After you have determined the most convenient location in your vehicle, hold the
transceiver with mounting bracket in the exact location you have chosen. If nothing
interferes with mounting it in the desired position, remove the mounting bolts. Before
drilling the holes, make sure nothing will interfere with the installation of the mounting
bolts.
2. Connect the antenna cable plug to the standard receptacle on the rear panel. Most CB
antennas are terminated with a PL 259 type plug and mate with the receptacle.
3. Connect the red DC power input wire (with the fuse) to +13.8 Vdc. This wire extends
from the rear panel. In automobile installation, +13.8 Vdc is usually obtained from the
accessory contact on the ignition switch. This prevents the set being left on accidentally
when the driver leaves the car, and also permits operating the unit without the engine
running. Locate the accessory contact on most ignition switches by tracing the power
wire from the AM broadcast receiver in the car.
4. Connect the black lead to +13.8 Vdc. This is usually the chassis of the car. Any convenient
location with good electrical contact (remove paint) may be used.
5. Mount the microphone bracket on the right side of the transceiver or near the transceiver,
using the two supplied screws. When mounting on a car, place the bracket under the
dash so the microphone is readily accessible.
IGNITION NOISE INTERFERENCE
The use of a mobile receiver at low signal levels is normally limited by the presence of
electrical noise. The primary source of noise in car installations is from the operated
with vehicle engine turned off. The unit requires very little current and therefore will not
signicantly discharge the vehicle battery. In some installations, ignition interference may
b
e high enough to make good communications impossible. The electrical noise may come
from several sources. Many possibilities exist and variations between vehicles require
different solutions to reduce the noise.
ANTENNA
A vertically polarized, quarter-wavelength whip antenna provides the most reliable
operation and greatest range. Shorter, loaded-type whip antennas are more attractive,
compact and adequate for applications where the maximum possible distance is not
required. Also, the loaded whips do not present the problems of height imposed by a full
quarter-wavelength whip. Mobile whip antennas utilize the metal body of the vehicle as a
ground plane. When mounted at a corner of the vehicle they are slightly directional, in the
E N G L I S H
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direction of the body of the vehicle. For all pratical purposes, however, the radiation pattern
is nondirectional. The slight directional characteristic will be observed only at extreme
distances. A standard antenna connector (type SO 239) is provided on the transceiver for
easy connection to a standard PL 259 cable termination. If the transceiver is not mounted
on a metal surface, it is necessary to run a separate ground wire from the unit to a good
metal electrical ground in the vehicle. When installed in a boat, the transceiver will not
operate at maximum efciently without a ground plate, unless the vessel has a steel hull.
B
efore installing the transceiver in a boat, consult your dealer for information regarding an
adequate grounding system and prevention of electrolysis between ttings in the hull and
w
ater.
TUNING THE ANTENNA FOR OPTIMUM SWR
Since there is such a wide variety of base and mobile antennas, this section will strictly
concern itself to the various types of mobile adjustable antennas. Because the antenna
length is directly related to the channel frequency, it must be tuned to resonate optimally
all 40 channels of the transceiver. Channel 1 requires a longer antenna than Channel 40
because it is lower in frequency. Due to the various methods of adjusting antennas for
proper SWR we have chosen what we think is the optimum method:
A. Antennas with adjustment screws (set screws).
1.
Start with the antenna extended and tighten the set screw lightly enough so that the
antenna can be lightly tapped with your nger for easy adjustment.
2. Set your transceiver to Channel 2.0. Press the PTT (push-to-talk) switch, and tap
the antenna (making it shorter). The SWR meter will show a lower reading each time
the antenna is tapped. By continuing to shorten the antenna you will notice the SWR
reading will reach a low print and then start rising again. This means that you have
passed the optimum point for Channel 20. Adjust the antenna and again follow the
procedure above.
B. Antennas which must be cut to proper length.
1. Follow the same procedure as above, but adjust the length by cutting 2/3 mm increments
until a good match is obtained.
2. Be very careful not to cut too much at a time, as once it is cut, it can no longer be
lengthened.
3. The whip is easily cut by lling a notch all the way around and breaking the piece off
with pliers.
If you are having difculties in adjusting your antenna, check the following:
A. All doors must be closed when adjusting the antenna.
B. Make sure the antenna base is grounded.
C. Check your coaxial cable routing (it may be pinched when routed into the car).
D. Try a different location on your car (keeping in mind the radiation pattern you wish).
E. Is the antenna perfectly vertical?
F. Try a different location in your neighbourhood. Stay away from large metal objects when
adjusting (metal telephone or light posts, fences etc.)
WARNING: The transceiver will operate into a SWR of 2 to 1 indenitely and sustain a
S
WR of 20: 1 for a maximum of 5 minutes at rated operating conditions.
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