Nextech DC1108 - User Manual

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Rechargeable 1W UHF Transceiver Twin Pack

DC1108

User Manual

Use of the citizen band radio service is licensed in Australia by ACMA Radiocommunications

(Citizen Band Radio Stations) Class Licence and in New Zealand by MED General User

Radio Licence for Citizens Band Radio. Operation is subject to conditions contained in

those licences.

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The NEXTECH DC1108 is a rechargeable 1W UHF transceiver, designed for two-way communication over distances up to 6km in open areas. It supports 80 UHF channels and is licensed for citizen band radio service in Australia by ACMA Radiocommunications (Citizen Band Radio Stations) Class Licence and in New Zealand by MED General User Radio Licence for Citizens Band Radio. Operation is subject to conditions contained in those licences.

Function Description:

The device features a comprehensive set of communication and utility functions. It includes 155 Privacy Codes (50 CTCSS / 105 DCS) for secure communication, and a VOX function (Hands-free Transmission) for convenient operation without needing to press the PTT button. A built-in LED Flashlight provides illumination. For call management, it offers 10 Selectable Call Tones, a Voice Scrambler Function (Voice Encryption) for enhanced privacy, and a TOT (Time-Out Timer) Setting to prevent accidental continuous transmission. Other features include a Dual Watch Function for monitoring two channels simultaneously, a Scan Function to find active channels, and an Automatic Power Save mode to conserve battery life. Users can monitor channels with the Monitor Function, and a Roger Beep Tone signals the end of transmission. The Squelch Level (Level 1-9) allows adjustment of background noise filtering. A Keypad Lock prevents accidental changes to settings. The Whisper Function enhances transmission of soft voices. Power settings can be adjusted between HIGH/LOW. The device also includes a Speaker / Microphone Jack for external accessories and a Battery Meter / Low Battery Alert to keep track of power levels.

Important Technical Specifications:

The NEXTECH DC1108 operates on UHF frequencies. It has a 1W transmission power. The device utilizes 155 privacy codes, comprising 50 CTCSS (Continuous Tone-Coded Squelch System) and 105 DCS (Digitally Coded Squelch) codes. The channels are pre-programmed with specific frequencies and uses, including Simplex, Duplex – Repeater Output, Repeater Input, and specific channels for Convoy, Clubs & National Parks, Pacific Hwy (NSW) & Bruce Hwy (Qld) Road Channel, UHF CB Broadcasts, and Highway Channel. For example, Channel 1 operates at 476.4250 MHz (Duplex – Repeater Output), while Channel 12 is Simplex at 476.7000 MHz. The CTCSS codes range from 67.0 Hz to 254.1 Hz, and DCS codes are listed with three-digit numbers.

Usage Features:

The device is designed for user-friendly operation. To turn the radio ON/OFF, press and hold the MENU button. To transmit, press and hold the PTT button and speak into the microphone. To receive, release the PTT button. Volume can be adjusted using the VOL buttons. Channel selection is done via the CH buttons.

The display screen provides visual feedback on various settings, including Battery Meter, Quiet Talk CTCSS/DCS, TX Transmission or RX Receive, Keypad Lock, Dual Watch Channel, Whisper On, Function On, Number for CTCSS/DCS Codes, Scrambler On, VOX Turn On, Channel Number, Call Tone / Keypad Tone, and Function Off.

The menu system allows access to 14 different functions:

Quiet Talk CTCSS & DCS Privacy Codes (MENU 01): Allows selection of 155 privacy codes or turning them off.
Squelch Level (MENU 02): Adjusts the squelch level from 1 to 9 to filter out weak signals.
Setting and Transmitting Call Tones (MENU 03): Selects from 10 different call tones.
Roger Beep (MENU 04): Turns the Roger Beep tone ON/OFF.
Transmit (TX) Power Level Selection (MENU 05): Sets transmit power to High (HI) or Low (LO).
Time-Out Timer (TOT) (MENU 06): Prevents continuous transmission by setting a time limit (default 60 seconds).
Voice Operated Transmission (VOX) (MENU 07): Enables hands-free transmission with adjustable sensitivity levels.
Keypad Beep (MENU 08): Turns keypad tone ON/OFF.
Whisper Function (MENU 09): Enhances transmission of soft voices.
Optional Functions (MENU 10): Includes Voice Compander and Voice Scrambler (Encryption) for enhanced audio clarity and privacy.
Voice Scrambler Group ID (MENU 11): Sets a Scrambler ID for encrypted communication.
Earpiece/Headset Function (MENU 12): Enables use of an earpiece/headset.
Monitor Function (MENU 13): Allows listening to weak signals.
Dual Watch Function (MENU 14): Monitors two channels simultaneously.

Shortcut operations include:

LED Flashlight Function: Press and hold CH + to turn the flashlight ON/OFF.
Keypad Lock Function: Press and hold VOL + to lock the keypad. The lock icon will be displayed until unlocked.
Scan Function: Press and hold VOL - to turn channel scan ON.
Automatic Power Save: The radio is designed to switch to Power Save mode when there have been no transmissions for 3 seconds.

Maintenance Features:

The manual emphasizes several precautions to prevent fire, personal injury, and radio damage. Users should avoid modifying or attempting to adjust the radio for any reason. The radio should not be exposed to direct sunlight, nor placed close to heating appliances or in excessively dusty, humid, or wet areas. If an abnormal odor or smoke is detected, the radio should be turned OFF, the power immediately removed, and the optional battery pack removed. Contact the dealer for service.

Charging:

The radio uses a USB charging cable. To charge, ensure the radio is OFF, plug the USB cable into the charging port on the bottom of the radio, and then plug the AC adapter into an AC outlet. A red LED indicator light signifies charging, and a blue LED indicator light indicates a full charge. The Battery Meter and Low Battery Alert indicate the battery status. A full battery is indicated by a solid bar. Blinking bars indicate a low battery, prompting the user to charge or replace batteries immediately.

Troubleshooting:

The manual provides a troubleshooting guide for common issues:

No Power Supply: Check if the battery is exhausted, replace or recharge it, or if the battery is installed incorrectly.
The working time shorten, even the battery is fully charged: Replace the battery.
Not able to communicate with the radios of the same group: Confirm the CTCSS/DCS in the same frequency, or check if the distance is out of the talk range.
The voice of another group can be heard: Change all CTCSS/DCS of the group.
Other radios can not receive the Tx signals or receive signals in a volume: Switch the volume knob to the highest level, or the microphone may be damaged, requiring a dealer visit.
Noise is always heard: The distance may be out of range, or the radio may be turned on in a nearer range.