User's Manual

Before installing the transceiver in a boat, consult your dealer for
information regarding an adequate grounding system and prevention of
electrolysis between fittings 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 an all channels of the transceiver. Low
channel (CH 1) requires a longer antenna than high channel (CH 40) because
it is a lower frequency.
Due to the various methods of adjusting antennas for proper S.W.R., we
have chosen what we think is the optimum method :
A. Antenna with adjustable screws (set screw)
1. Start with the antenna extended and tighten the set screw lightly enough so
that the antenna can be lightly tapped with your finger for easy adjustment.
2. Set your transceiver to middle channel (CH 20). Press the PTT (push-to-
talk) switch, and tap the antenna (making it shorter). The S.W.R. meter
will show a lower reading each time the antenna is tapped. By continuing
to shorten the antenna, you will notice the S.W.R. reading will reach a low
point and then start rising again. This means that you have passed the
optimum point for channel 20.
Extend the antenna a short distance and again follow the procedure above.
When the lowest point has been reached, switch to low channel (CH 1) and
then to high channel (CH 40) and compare S.W.R. readings. They should
be almost equal.
B. Antennas which must be cut to proper length
1. Follow the same procedure as above, but adjust the length by cutting in
1/8" increments until a good match is obtained.
2. Be very careful not to cut too much at one time, as once it is cut, it can no
longer be lengthened.
3. The whip is easily cut by filing a notch all the way around and breaking
the piece off with pliers.
If you are having difficulties in adjusting your antenna, check the followings
:
a. All doors must be close 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 neighborhood. Stay away from large metal
objects when adjusting (metal telephone or lamp post, fences, etc.)
EXTERNAL SPEAKER
The external speaker jack (EXT. SP) on the rear panel is used for remote
receiver monitoring. The external speaker should have 8 Ohms impedance
and be able to handle at least 4 watts. When the external speaker is plugged
in, the internal speaker is disconnected.
PUBLIC ADDRESS
To use the transceiver as a public address system, connect an external 8
Ohms speaker (4 watts minimum) to the PA SP jack located on the rear
panel. Direct speaker away from the microphone to prevent acoustic
feedback. Physical separation or isolation of the microphone and speaker is
important when operating the PA at high output levels.
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