DP-666 DEEPELEC TEF6686 High Sensitivity Full Band DSP Radio

1. Introduction

The DP-666 is a high-sensitivity radio built around NXP's high-performance automotive-grade TEF6686 chip, offering exceptional selectivity and ultra-high sensitivity across multiple bands. This advanced DSP tuner incorporates a wide array of functions and sophisticated algorithms, including CEQ, EMS, iMS, PACS, and a noise canceller. Its Software-Defined Radio (SDR) signal processing excels in managing multipath interference, adjacent frequency interference, weak signal reception, and noise cancellation.

Based on the open-source project TEF6686_ESP32 by PE5PVB, the DP-666 supports a rich set of advanced features beyond basic radio listening. These include comprehensive Radio Data System (RDS) data display, automatic and manual station scanning, squelch functionality, battery voltage monitoring, customizable themes, multilingual support, and station presets.

The device features a redesigned circuit board, a 2.8-inch LCD color screen, and a numeric keypad for quick frequency input. Its portable design is complemented by a large-capacity 5000mAh battery for extended standby time. The DP-666 is designed to be a practical and convenient portable high-sensitivity travel radio.

2. Important Notes Before Use

Please read the following points carefully before operating your DP-666 radio:

• Open Source Project: The DP-666 radio is based on the PE5PVB open-source project TEF6686_ESP32. The project source code is publicly available for download and self-compilation.
• Firmware and Touchscreen: The radio features a 2.8-inch IPS display with resistive touch. However, the current firmware does not yet support touch operation. Our firmware is continuously being improved, and some errors or bugs may be present. Your understanding is appreciated.
• Antenna: The DP-666 uses an external antenna with a standard SMA male screw female connector. It does not have a built-in magnetic rod antenna.
• Connectivity: The WIFI function is currently under improvement, and the Bluetooth function is not yet implemented. Programmers are welcome to engage in secondary development.
• DIY Product: This is a DIY product, and while efforts are made for practicality and convenience, some minor flaws or shortcomings may exist. Perfectionists should consider this before purchase.

For the latest manual, videos, and firmware downloads, please visit: deepelec.com/dp-666

3. Package Contents

Ensure all items are present in your package:

• DP-666 Host Unit (with 3.7V/5000mAh lithium battery installed) x 1
• High-quality telescopic antenna with SMA connector x 1
• USB-A to TYPE-C 1-meter data cable x 1
• Storage bag x 1

4. Specifications

Frequency Ranges:

5. Setup Guide

5.1. Initial Inspection

Upon receiving your DP-666 radio, carefully unpack all components and verify against the 'Package Contents' list. Inspect the unit for any visible damage.

5.2. Attaching the Antenna

Locate the SMA connector on the top of the radio. Gently screw the telescopic antenna onto this connector until it is secure. Do not overtighten.

5.3. Charging the Battery

Before first use, it is recommended to fully charge the radio. Connect the provided USB-A to TYPE-C cable to the TYPE-C port on the side of the radio and plug the other end into a standard USB power adapter (not included) or a computer USB port. The charging indicator on the display will show the charging status.

5.4. Powering On/Off

Press and hold the red 'POWER' button located on the front panel below the display to turn the radio on or off.

6. Operating Instructions

6.1. Controls Overview

• Power Button: Red button, press and hold to turn on/off.
• Tuning Knobs: Two rotary encoders on the right side for frequency tuning and menu navigation.
• Numeric Keypad (0-9): For direct frequency input.
• MODE Button: Cycles through different operating modes (e.g., manual, auto scan).
• BAND Button: Switches between frequency bands (FM, LW, MW, SW).
• BW Button: Adjusts bandwidth.
• DX Button: Activates DX (distant station) mode for enhanced sensitivity.
• MAN/AUTO/MEM: Buttons for manual tuning, auto scanning, and memory functions.

6.2. Band Selection

Press the 'BAND' button to cycle through the available frequency bands: FM, Longwave (LW), Mediumwave (MW), and Shortwave (SW). The currently selected band will be displayed on the IPS LCD screen.

6.3. Tuning to a Station

• Using Tuning Knobs: Rotate the upper right knob to adjust the frequency. The step size can often be changed via menu settings or by short-pressing a specific button (refer to on-screen prompts).
• Direct Frequency Input: Use the numeric keypad (0-9) to directly enter the desired frequency. Press 'ENTER' or a similar confirmation button if prompted.
• Auto Scan: Press the 'AUTO' button to initiate an automatic scan for available stations within the current band.
• Manual Scan: Use the 'MAN' button in conjunction with tuning to fine-tune or step through frequencies manually.

6.4. RDS Information (FM Only)

When tuned to an FM station that broadcasts RDS data, the display will show information such as Program Type (PTY), Program Service name (PS), and Radio Text (RT). This feature requires local radio station support.

6.5. Volume Control

Rotate the lower right knob labeled 'VOLUME' to adjust the audio output level.

6.6. Headphone Output

A 3.5mm audio jack is located on the side of the radio for connecting headphones or an external speaker. This output is designed for independent dual-functionality for both speaker and headphones.

6.7. Demonstration Video

Watch this video for a demonstration of tuning and band switching on the DP-666 radio:

7. Maintenance

7.1. Cleaning

To clean the radio, use a soft, dry cloth. Do not use liquid cleaners, aerosols, or solvents, as these may damage the finish or internal components.

7.2. Battery Care

The DP-666 is equipped with a built-in lithium battery. To prolong battery life:

• Avoid exposing the radio to extreme temperatures (hot or cold).
• Charge the battery regularly, even if the radio is not used frequently.
• If storing the radio for an extended period, ensure the battery is charged to about 50%.

7.3. Antenna Care

When not in use, retract the telescopic antenna to prevent accidental damage. Avoid bending or forcing the antenna.

8. Troubleshooting

If you encounter issues with your DP-666 radio, please refer to the following common problems and solutions:

8.1. No Power

• Check Battery: Ensure the battery is sufficiently charged. Connect the radio to a power source using the USB-C cable.
• Power Button: Make sure you are pressing and holding the 'POWER' button for a few seconds to turn the unit on.

8.2. Poor Reception / No Sound

• Antenna: Ensure the telescopic antenna is fully extended and properly connected. Try adjusting its orientation.
• Location: Move the radio to a different location, away from potential sources of interference (e.g., computers, large metal objects, other electronic devices).
• Bandwidth (BW): Experiment with different bandwidth settings to improve signal clarity, especially for weak signals.
• Volume: Check that the volume is turned up and that headphones (if connected) are working correctly.
• Squelch: If squelch is enabled and set too high, it might suppress weak signals. Adjust or disable squelch if necessary.

8.3. Firmware Issues / Unexpected Behavior

As the firmware is under continuous development, occasional bugs or unexpected behavior may occur. Please check the official product page for the latest firmware updates and installation instructions. Updating the firmware can often resolve such issues.

9. User Tips

• Optimal Reception: For the best signal reception, always fully extend the telescopic antenna and try different orientations. For Shortwave (SW) listening, an external long-wire antenna can significantly improve performance.
• Quick Frequency Input: Utilize the numeric keypad for fast and precise tuning to known frequencies. This is often quicker than using the rotary tuning knobs for large frequency jumps.
• Firmware Updates: While the current firmware does not support touchscreen functionality, future updates may enable it. Regularly check the official product website (deepelec.com/dp-666) for the latest firmware to access new features and bug fixes.
• Exploring Open Source: For technically inclined users, the open-source nature of the project (PE5PVB project: github.com/PE5PVB/TEF6686_ESP32, DP-666 project: github.com/flyoob/TEF6686_ESP32) allows for custom modifications and secondary development.

10. Warranty and Support

For any product-related inquiries, technical support, or to report issues, please refer to the official product page or contact the seller directly. As this product is based on an open-source project, community support and resources are also available through the project's GitHub repositories:

• PE5PVB project: github.com/PE5PVB/TEF6686_ESP32
• DP-666 project: github.com/flyoob/TEF6686_ESP32

Please note that due to the DIY nature and ongoing development of the firmware, specific warranty terms may vary. Always consult with your point of purchase for detailed warranty information.