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40 ch am mobile transceiver

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Instruction manual (16 pages)

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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

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:

Select the desired channel.

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.

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.