Radio Shack HTX-420 owner manual 124#6+10

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Temporarily Opening Squelch

The current setting for Squelch, Repeater Offset for the selected band, RX Tone, and TX Tone can be displayed by pressing and holding M. (see “Setting the CTCSS Tones” on Page 6).

Selecting Frequencies and Receiving Transmissions

When you directly enter a frequency, the transceiver accepts only six digits and it automatically rounds down the last digit of the frequency to 0 or 5. For example, if you enter 440.244, your transceiver accepts it as 440.240. If you enter 440.248, the transceiver accepts it as 440.245. If you set the frequency step to 6.25 kHz, 7.5 kHz, or

12.5 kHz, you need to select frequencies using CH, or 8 or 9.

If the transceiver picks up unwanted, weak transmissions, set the squelch to a different level (See “Setting the Squelch Level” on Page 4).

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It is illegal to transmit if you do not have at least a Technician Class license issued by the FCC.

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Your transceiver's buttons perform multiple functions. The abbreviation or symbol for a function is printed on, above, or below each button.

To activate certain transceiver features, you must press F (function) and another button at the same time. Those key combination instructions are printed as first button name, +, then the second button name. For example, F+TOT means hold down F while you press TOT.

Button names are printed in small, bold, capital letters such as CLR or MR. Words, symbols, and numbers that appear on the

display are printed using a distinctive typeface, such as '*,$/*& or CH.

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To turn on the transceiver, press PWR. The radio beeps once if the key tone feature is enabled. Then the current battery voltage briefly appears and the last used frequency appears. To turn the transceiver off, press PWR again.

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Turn on the transceiver then repeatedly press

6or 7 until the current squelch setting (&&

to &+) and IGB appear. Repeatedly press

8 or 9 or rotate CH to change the squelch setting. A higher number reduces noise in- between transmissions while a lower number allows you to hear a weak transmission.

Press or PTT (Push to Talk) to store the setting and exit squelch setting.

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If you use the Tone Squelch (CTCSS) feature (see “Setting the CTCSS Tones” on Page 6), you might not hear a transmission on the current frequency. To temporarily open the squelch so you can hear all transmissions on the frequency, hold down M. To resume normal operation, release M. ±

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Repeatedly press until the transceiver displays a frequency from the desired band. The band changes in the following order: VHF, UHF, AIR, WX.

Repeatedly pressing 6or7 allows selection of squelch, VHF repeater offset, UHF repeater offset, receive tone squelch (CTCSS), transmit tone squelch (CTCSS), DTMF, SAME area code, and SAME on/off

setting mode. IGB, L>< HFJ, K>< HFJ, HN JED;, JN JED;, ZJC<, 7H;7, and I7C; appear.

Press 8 or 9, or rotate CH to change the value of the selected setting. Press or PTT to store the setting and exit.

The detailed operation for squelch, VHF repeater offset, UHF repeater offset, receive tone squelch (CTCSS), transmit tone squelch (CTCSS), DTMF, SAME area code, and SAME on/off is described in the relevant sections.

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1. Repeatedly press to select the desired receiving mode (VHF, UHF, Air, Weather).

2.Select a frequency using one of the following methods.

Using CH: Rotate CH clockwise or counterclockwise to select a frequency (or channel for the weather band). The frequency changes in increments you set (see “Setting the Frequency Step” on Page 8) for each rotation click. Hold down F while rotating CH to change the frequency by 1 MHz increments regardless of the selected step frequency.

Using 8 and 9: Repeatedly press (or hold down) 8 or 9 until the desired

frequency appears. Hold down F while pressing 8 or 9 to change the frequency by 1 MHz increments.

Using Direct Key Entry: Use the number keys to directly enter a frequency, including the three numbers to the right

of the decimal. (You do not enter the decimal point.) ±

3.Set VOL to a comfortable listening level. ±

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There are two basic types of communication possible with this transceiver: radio-direct-to- radio (simplex) or radio-to-repeater-to radio (duplex). Simplex uses the same frequency to send and receive. Duplex uses one frequency to transmit and another to receive. For more information about duplex, see “Understanding Repeaters” on Page 5. .

1.Select the desired transmit band VHF/ UHF and frequency using manual or direct entry.

2.Hold the transceiver about 3 inches from your mouth.

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