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 counter-
clockwise. 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.
2. 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.
3. To receive, release the push-to-talk button. Be sure the mic plug is firmly con-
nected to the jack.
NOTE: shouting into the mic will not increase your power or signal. An internal cir-
cuit automatically sets the mic signal for maximum modulation, so speak loudly will
give no advantage.
PRIORITY CHANNELS (CH 9-19)
ALAN 199-A comes with an emergency selector that permits the immediate activa-
tion 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 activa-
ted.
REMOTE SPEAKER OPERATION
An 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.
7
ENGLISH
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 - 13.2
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 per-
forms as well in most applications as does the ground plane. You
can use this type of antenna for medium-long range communica-
tions.
USING YOUR TRANSCEIVER
Do not transmit without a suitable antenna or 50 Ohm load connec-
ted to the antenna connector.
To receive:
1. Check that the red wire is properly connected to a source of 12-
13.2 V.
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
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 clock-
wise 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, or weak signals will not be
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