USING THE CALLING-FREQUENCY MEMORY

The calling-frequency memory location lets you quickly jump to a specific frequency at any time. The default calling frequency is 446.0000 MHz. You can store a different frequency into mem- ory as well as other settings associated with that frequency, such as the repeater offset and CTCSS tone.

1.Press C to display the current calling frequency.

2.To change the frequency, hold down C until flash.

and C

3.Select a frequency. See “Selecting Frequencies (Direct Tuning)” on Page 23.

4.Press C to store the selected frequency in memory.

5.To enter a frequency offset for repeater operation, press FUNC+SC. The HTX-400 displays the current offset for the calling frequency. To select a new offset value, press or . Select 0.00 Hz if you want to remove the offset. To store the setting, press PTT.

6.To select the offset direction (+ or –), press FUNC + REV. To remove an offset for simplex operation, set the repeater offset to 0.00.

Note: While and C appear, you can program other set- tings such as CTCSS tones (see “Continuous Tone Coded Squelch System Features” on Page 35.)

To enable the calling frequency, press C at any time. The trans- ceiver immediately tunes to that frequency with the settings you programmed. To exit the calling frequency mode, press C again.

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Radio Shack HTX-400 owner manual Using the CALLING-FREQUENCY Memory
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HTX-400 specifications

The Radio Shack HTX-400, introduced in the mid-1990s, remains a beloved model among amateur radio enthusiasts and collectors. Known for its reliability and versatility, this transceiver is particularly notable for its compact design and user-friendly interface. The HTX-400 operates on both VHF and UHF frequencies, enabling users to communicate effectively across various channels.

One of the HTX-400’s key features is its output power, which is adjustable between 1 and 40 watts. This flexibility allows operators to choose their transmitting power based on the communication needs and conditions of their environment. The device operates on the 2-meter band, covering the frequency range of approximately 144 to 148 MHz, making it ideal for local communications as well as a part of emergency communication networks.

A significant technological aspect of the HTX-400 is its digital display, which provides clear readings of frequency and signal strength. Users appreciate the intuitive control layout, which allows for quick adjustments and easy channel changes. The built-in memory function can store multiple frequencies, providing users with the ability to switch quickly between channels they use frequently.

Another standout feature is its CTCSS tone encoding and decoding capability. This allows operators to filter incoming signals and communicate within designated groups without interference from other conversations on the same frequency. This capability enhances clarity and reduces noise, making it an excellent choice for repeaters.

The HTX-400 also includes an Automatic Gain Control (AGC) feature, which adjusts the receiver automatically to varying signal strengths, ensuring consistent audio quality even in weak signal conditions.

Portability is a major consideration for amateur radio operators, and the compact size of the HTX-400 makes it easy to transport. It operates effectively with various power sources, including a standard AC power supply and battery, making it a suitable option for both home use and portable operations.

In conclusion, the Radio Shack HTX-400 is a versatile and reliable transceiver that features adjustable power output, user-friendly controls, memory functions, CTCSS tone capabilities, and excellent portability. Its combination of advanced technologies and practical design has made it a favorite among radio enthusiasts for decades.
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