Radio Shack HTX-420 owner manual #37+%-.11-#66*&+52.#, Appears when F function key is pressed

rubber dust cover from the SPK and MIC jacks on top of the transceiver. Then insert the plug of an optional voice-activated headset with microphone, or an optional communication headset, into the jacks. . ±

You can also connect an optional mono earphone to the SPK jack. This lets you use the transceiver's push-to-talk button (PTT) to transmit as usual. Your local RadioShack store carries a wide selection of suitable communications headsets, earphones, and separate components.

The following schematic diagram shows the typical wiring for an external mic and speaker.

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Use only microphone and speaker accessories that do not share a common ground for the speaker and the microphone. Doing otherwise might damage the transceiver.

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Connecting a headset’s plug to the transceiver’s SPK jack automatically disconnects the internal speaker.

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1.y— appears when F (function) key is pressed.

2.J — appears when Tone Squelch (CTCSS) is enabled for transmitting. SQ appears when Tone Squelch (CTCSS) is enabled for receiving. TSQ appears when Tone Squelch (CTCSS) is enabled for transmitting and receiving.

3.+ — appears to indicate a positive repeater offset. – indicates a negative offset.

4.JEJ — appears when a time for the time- out timer is selected.

5.7F — appears when Auto Power Off is enabled.

6.r— appears when the SAME alert is enabled. The icon flashes when the transceiver is out of range.

7.í — indicates the battery strength.

8.z — indicates the keypad control is disabled to prevent accidental setting changes.

9.q — appears when you use the cross band feature.

10.o (Memory Channel Recall) — appears when you recall a memory channel.

11.2-Digit Number below o — indicates memory location number.

12.Sub Frequency Display (appears on the bottom of the display) — shows the transmit frequency and other settings. In the compass mode, the display shows direction indicator and angles in degree.

13.Signal Strength/Power Meter — shows the relative signal strength or power level.

14.p — appears and flashes when power save is on.

15.C — indicates the output power is middle. B indicates the output power is low. When neither of these appears, the output power is high.

16.Main Frequency Display (appears in the middle of the display) — shows the receive frequency.

17.7 — appears when the transceiver tunes to the air band. (Not shown on this display.)

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