Radio Shack HTX-400 owner manual Reducing Squelch Tail, Busy Channel Lockout

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REDUCING SQUELCH TAIL

If you are communicating with a repeater or another station using subaudible tones, you can eliminate the squelch tail (the burst of noise the other person hears when you stop transmitting) by turn- ing on the transmit delay option. When you turn on this feature and use CTCSS, the radio continues to transmit for a short period of time after you release PTT, but then it immediately drops the subaudible tone. This causes the other radio to close the squelch before there is “dead air,” preventing the squelch tail.

Use the Main Menu (see “Using the HTX-400’s Menus” on Page

16)to set the transmit delay option, . Then, with t.dy and the current status displayed, press or to turn this feature on or off.

BUSY CHANNEL LOCKOUT

Use the Main Menu to set the busy channel lockout (see “Using the HTX-400’s Menus” on Page 16). The lockout prevents the transceiver from transmitting while it is receiving a signal. With the radio’s preset value bCLO oF displayed, press or to change the display to bCLO oN. Repeat this step to change the display back to bCLO oF to disable the lockout .

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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 PagingChanging the Transmit Frequency Range Other Special FeaturesLocking the Keypad Lighting the DisplayTurning 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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