Radio Shack HTX-420 Owner's Manual page 21

Compact handheld 2m/70cm fm amateur transceiver
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BG TECH.
CONTINUOUS
SYSTEM FEATURES
Your transceiver can transmit and receive a low-level, selectable, subaudible tone at the same time as it
transmits (TX) or receives(RX) a regular signal. This special tone lets you listen only to other radio set to the
same tone frequency when you use the transceiver in simplex operation. It also lets you match your radio to
the subaudible tone frequency used by a local repeater.
USING THE CTCSS TONES
To enable only the transmit (TX) tone, press "F" + "T.SQL(1)" key. T appears above the displayed
frequency. To enable only the receive (RX) tones, press F + T.SQL(1) key and then SQ appears
above the displayed frequency. To enable Both TX and RX tones, press "F" + "T.SQL(1)" key again
and then TSQ appears above the displayed frequency.
VERSION III
2001/2/28
TONE
CODED
SQUELCH

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