Using Your Transceiver - Midland M ZERO PLUS Manual Del Usaurio

USING YOUR TRANSCEIVER

Do not transmit without a suitable antenna or 50 Ohm load connected to the an-
tenna connector.
To receive:
13. Make sure that the cigarette lighter plug is properly inserted into a 12V power
socket.
14. Make sure that the antenna and the microphone are attached.
15. The emergency knob must be set to the CH position.
16. Set the Squelch control to maximum counterclockwise position.
17. Turn on the unit by rotating the VOLUME control clockwise.
18. Turn the RF-GAIN knob totally clockwise.
19. Set channel selector to the desired channel.
20. Adjust VOLUME for a suitable listening level.
21. 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 si-
gnals. 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 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 and the modulation (AM or FM).
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
connected to the jack.
M Zero Plus Instruction Guide | 9