Bedienungsanleitung Midland 8001 XT (Seite 13 von 72) (Deutsch, Englisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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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 efciently without a ground plate, unless the vessel has a steel hull.

Before 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

water.

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 difculties 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 indenitely and sustain a

SWR of 20: 1 for a maximum of 5 minutes at rated operating conditions.

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