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Midland ALAN 100 PLUS B Manual

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5
BASE STATION ANTENNA
While your transceiver is designed for mobile operation, you might
wish to use it as a base station unit, in conjunction with a 12 - 13.8 V
2 A DC power supply. If you decide to use your transceiver as a base
station, choose an antenna designed to operate most efficiently as a
base station antenna. For example, the 1/2 wave antenna is a high-
efficiency radiator with omnidirectional characteristics. It performs
as well in most applications as does the ground plane. You can use
this type of antenna for medium-long range communications.
USING YOUR TRANSCEIVER
Do not transmit without a suitable antenna or 50 Ohm load con-
nected to the antenna connector.
To receive:
1. Check that the unit is properly connected to a source of 12-13.8
V through the in-line fuse and red wire.
1. Make sure that the antenna is attached.
1. Connect the mic plug to the mic jack.
1. Select AM or FM mode.
1. Set the emergency switch to the center position.
1. Set the Squelch control to maximum counterclockwise position.
1. Turn on the unit by rotating the ON/OFF/VOL control.
1. Set channel selector to the desired channel.
1. Adjust the volume to a suitable listening level.
1. Adjust Squelch to cut out annoying background noise when no signal is
being received.To do this, set the Channel Selector to a channel where no
signals are present or wait until signals cease on your channel.
Then, rotate the Squelch control in a clockwise direction to the point where
the background noise just stops. Now, when a signal is present, you will hear
it, but will not be disturbed by noise on the channel between signals.
When properly set, the Squelch keeps the receiver “dead” until a signal comes
in on that channel. However, do not set the Squelch too high, otherwise weak
signals will not be able to open the Squelch circuit. To receive very weak si-
gnals, it is best to leave Squelch set to the minimum position by rotating the
control maximum counterclockwise. The Squelch circuit in your Transceiver is
an advanced design. It uses an operational amp IC to accomplish a hysteresis
action. The result is that when you set the Squelch for a precise signal level,
if that signal level increases or decreases in strength, the Squelch circuit will
follow this change. With conventional Squelch circuit, often a signal which
changes strength get “chopped” by the Squelch circuit and you lose a portion
of the message.
With a hysteresis Squelch, you get it all.
To Transmit:
1. Select the desired channel.
1. Press the push-to talk button on the microphone and hold it an angle
about 5-7 cm from your mouth and speak in a normal voice.
1. To receive, release the push-to-talk button.
Be sure the mic plug is firmly connected to the jack.
NOTE: shouting into the mic will not increase your power or signal. An in-
ternal circuit automatically sets the mic signal for maximum modulation,
so speaking loudly will give no advantage.
REMOTE SPEAKER OPERATION
A 4 Ohm speaker, rated at 3-10 watts, should be used for this function. Plug
the speaker into the EXT SPKR jack at the rear of the transceiver. When the
external speaker is plugged in, the internal speaker is disconnected. You can
now monitor all incoming signals through your remote speaker.
ISTR ALAN100PLUS B NEW.indd 5 11/12/12 12.23
… 13 …


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