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Midland ALAN 199 Manual

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8 | Alan 199 Instruction Guide Alan 199 Instruction Guide | 9
just stops. Now, when a signal is present, you will hear it, but will not be di-
sturbed 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, or weak signals will not be able
to open the Squelch circuit. To receive very weak signals, 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 por-
tion of the message. With a hysteresis Squelch, you get it all.
To Transmit:
1. Select the desired channel.
2. Press the push-to talk button on the microphone and hold it an an-
gle about 5-7 cm from your mouth and speak in a normal voice.
3. 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 speak loudly will give no advantage.
PRIORITY CHANNELS (CH 9-19)
Alan 199 comes with an emergency selector that permits the immediate
activation of channels 9 or 19. The former (CH9) is used for emergency
communications only, while with the latter (CH19) you can ask for traffic
information, etc.
By moving this knob to the central position, the last channel selected will
be activated.
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 discon-
nected. You can now monitor all incoming signals through your remote
speaker.
BASE STATION ANTENNA
While your Transceiver is designed for mobile opera-
tion, you might wish to use it as a base station unit,
in conjunction with a 12,6 Vdc ± 10% 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 com-
munications.
USING YOUR TRANSCEIVER
Do not transmit without a suitable antenna or 50 Ohm load connected to
the antenna connector.
To receive:
1. Check that the red wire is properly connected to a source of 12,6 V
± 10%.
2. Make sure that the antenna and the microphone are attached.
3. The emergency knob must be set to the central position.
4. Select the transmitting power.
5. Set the Squelch control to maximum counterclockwise position.
6. Turn on the unit by rotating the VOLUME control clockwise.
7. Set channel selector to the desired channel.
8. Adjust VOLUME for a suitable listening level.
9. Adjust Squelch to cut out annoying background noise when no si-
gnal is being received.
To do this, set the Channel Selector to a channel where no signals are pre-
sent or wait until signals cease on your channel. Then, rotate the Squelch
control in a clockwise direction to the point where the background noise
… 13 …


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