Transmitting

There are two basic types of communication possible with this transceiver: radio-direct-to-radio (simplex) or radio-to repeater-to radio (duplex). Simplex operation uses the same frequency to send and receive. Duplex operation uses one frequency to trans- mit and another to receive. For more information about duplex, see “Understanding Repeaters” on Page 26.

Caution: It is illegal to transmit if you do not have at least a Tech- nician Class license issued by the FCC.

Follow these steps to transmit.

1.Select the desired frequency using manual or direct entry.

2.Hold the HTX-400 about 3 inches from your mouth.

3.Hold down PTT, then speak slowly and clearly into the micro- phone. TX appears while you transmit.

Note: If you try to transmit outside the transmit frequency range, inhibit briefly appears.

4.Release PTT when you finish transmitting.

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Radio Shack HTX-400 owner manual Transmitting

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.

Contents

HTX-400 Features Ctcss FCC Information Manual Conventions Contents Continuous Tone Coded Squelch System Features Introduction to Amateur Radio Page Preparation Power Sources Testing Internal Batteries Using NI-CD or NI-MH Battery Power Using AC Power Using Vehicle Battery Power Attaching the Belt Clip Connecting the Antenna Attaching the Wrist Strap Connecting a MICROPHONE/ Speaker PTT Using the HTX-400’S Menus Using the Menus Tot Tone Set Setting Option = default setting Description Use it to Func + Key to Quick Look AT the Controls MO REV VOL, and SQ Held down at the same time Quick Look AT the Display Operation Selecting Frequencies Direct TuningTurning on the HTX-400 Temporarily Opening Squelch Receiving Transmissions Transmitting Understanding Repeaters Turning Duplex Operation on and OFF Setting the Repeater Offset Frequency Reversing the Transmit and Receive Frequencies Setting the Repeater Offset Direction Storing a TRANSMIT/RECEIVE Frequency Memory Operation Clearing a Single Memory Recalling Memories Using the CALLING-FREQUENCY Memory Scanning for Active Frequencies Scanning OperationScanning Standard Memory Locations Setting a Memory Location to Always Skip During Scanning Page Continuous Tone Coded Squelch System Features Subaudible Tone Frequencies Hz Sending Paging Tones Tone Paging Changing the Transmit Frequency Range Other Special FeaturesLocking the Keypad Lighting the Display Setting the Frequency Step Checking the Current Memory SettingsTurning the KEY Tone on and OFF TIME-OUT Timer Power Save Busy Channel Lockout Reducing Squelch Tail You see Possible Cause Remedies Troubleshooting Care and Maintenance Resetting the HTX-400 Using the Keypad Diagnostic General SpecificationsPage Page Limited One-Year Warranty