OlympianSeries Mobile Radio User’s Guide

Receiving Transmissions from Other Radios

Each channel of your radio may be programmed for carrier squelch operation, CTCSS/DCS operation or 2-tone operation. The following paragraphs describe these modes of operation. Ask your dealer or communications coordinator if you have questions on how your radio has been programmed to operate.

Carrier Squelch Operation

A signal that matches the programmed receive frequency will be heard if it is of sufficient strength to exceed the squelch threshold. An on frequency signal exceeding the squelch threshold level will be indicated by a steady green Tx/Busy indicator.

CTCSS/DCS Operation

CTCSS or DCS signaling adds an additional condition to carrier squelch operation. In addition to the signal having to exceed the squelch threshold level, the received signal must also have the correct CTCSS or DCS tone or code before the audio will be passed to the speaker. CTCSS or DCS signaling allows multiple users on the same frequency to hear only signals which have their correct CTCSS tone or DCS code. An on frequency signal with the correct CTCSS or DCS signaling will be indicated by a steady green TX/Busy indicator. An amber TX/Busy indicator means that the channel is busy, but the correct CTCSS or DCS signaling is not present.

CTCSS/DCS allows multiple users to share the same frequency. However CTCSS/DCS is only useful to avoid disturbing other users with messages not related to them. If more than one radio is transmitting at the same time, this will cause interference. Do not transmit if the TX/Busy indicator is illuminated green or amber. Wait until the channel is clear before transmitting.

2-tone Operation

2-tone signaling allows individual or group calls to be made to your radio. The radio may have been programmed to mute all

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Midland Radio MO-7128, MO-4128 Receiving Transmissions from Other Radios, Carrier Squelch Operation, CTCSS/DCS Operation

MO-7008, MO-7128, MO-4128 specifications

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