Radio Shack HTX-400 owner manual Using AC Power, Using NI-CD or NI-MH Battery Power

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USING AC POWER

You can operate the HTX-400 from AC power using a regulated power supply capable of supplying 13.8 VDC at least 1A and a vehicle power adapter (see “Using Vehicle Battery Power” on Page 12). The supply should also have an accessory power socket into which the DC-to-DC power adapter fits. If your power supply does not have an accessory power socket, you can either wire the power cord directly to your power supply or add an ac- cessory power socket to the supply. Suitable connectors, power supplies, power cords, and sockets are available at your local RadioShack store.

The following illustration shows how to connect a typical power supply, a DC-to-DC power adapter, and the HTX-400.

USING NI-CD OR NI-MH BATTERY POWER

You can use either Ni-Cd or Ni-MH batteries to power your HTX- 400; however, you cannot recharge these batteries while they are inside the HTX-400. You can use a separate external charger for recharging the batteries outside the radio. Your local RadioShack store carries a selection of suitable batteries and chargers.

Note: As these batteries provide less voltage than that typically supplied by alkaline batteries, expect less transmitting output power when you use the HTX-400 with Ni-Cd or Ni-MH battery power.

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Contents HTX-400 Features Ctcss FCC Information Manual ConventionsContents Continuous Tone Coded Squelch System Features Introduction to Amateur Radio Page Preparation Power SourcesTesting Internal Batteries Using NI-CD or NI-MH Battery Power Using AC PowerUsing Vehicle Battery Power Attaching the Belt Clip Connecting the AntennaAttaching the Wrist Strap Connecting a MICROPHONE/ SpeakerPTT Using the HTX-400’S Menus Using the MenusTot Tone Set Setting Option = default setting Description Use it to Func + Key to Quick Look AT the ControlsMO REV VOL, and SQ Held down at the same time Quick Look AT the DisplayTurning on the HTX-400 Selecting Frequencies Direct TuningOperation Temporarily Opening Squelch Receiving TransmissionsTransmitting Understanding Repeaters Turning Duplex Operation on and OFF Setting the Repeater Offset FrequencyReversing the Transmit and Receive Frequencies Setting the Repeater Offset DirectionStoring a TRANSMIT/RECEIVE Frequency Memory OperationClearing a Single Memory Recalling MemoriesUsing the CALLING-FREQUENCY Memory Scanning Standard Memory Locations Scanning OperationScanning for Active Frequencies Setting a Memory Location to Always Skip During Scanning Page Continuous Tone Coded Squelch System Features Subaudible Tone Frequencies Hz Sending Paging Tones Tone PagingLighting the Display Other Special FeaturesChanging the Transmit Frequency Range Locking the KeypadTurning the KEY Tone on and OFF Checking the Current Memory SettingsSetting the Frequency Step TIME-OUT Timer Power SaveBusy Channel Lockout Reducing Squelch TailYou see Possible Cause Remedies TroubleshootingCare and Maintenance Resetting the HTX-400 Using the Keypad DiagnosticGeneral SpecificationsPage Page Limited One-Year Warranty

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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