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, and its successor the , are compact, high-performance all-band radio receivers designed for shortwave listeners (SWL) and radio hobbyists. Built around the powerful SI4732 DSP chip and driven by an Arduino-based
platform, these radios offer sophisticated features like Single Sideband (SSB) reception in a pocket-sized aluminum case. Core Technical Specifications
The device is prized for its versatility, supporting a wide range of broadcast and amateur bands: Frequency Range:
Covers FM (76–108 MHz), Longwave (150–510 kHz), Medium Wave (520–1720 kHz), and Shortwave (1.7–30 MHz). Demodulation Modes:
Supports FM, AM, and SSB (both Upper Sideband/USB and Lower Sideband/LSB). Selectivity:
Features adjustable audio bandwidth filters (0.5, 1, 1.2, 2.2, 3, and 4 kHz) to help isolate weak signals.
Equipped with a 0.96-inch OLED display, a built-in 3.6V lithium battery, and a BNC or SMA antenna interface. Operational Guide Summary
While official paper manuals are often scarce or briefly included, the device follows an intuitive interface:
The ATS-20 radio is a popular, compact, and versatile shortwave radio receiver. Here's some general information about it:
The ATS-20 radio manual typically covers various aspects of the radio's operation, features, and specifications. Here are some key points that are often included:
Key Features:
Operating Instructions:
Specifications:
Troubleshooting:
Additional Information:
If you're looking for a specific ATS-20 radio manual, I can suggest some possible sources:
Finding a comprehensive official manual for the ATS-20 all-band radio receiver can be difficult as it is often sold under various generic brands without detailed documentation. ATS-20+ / V2 Quick Start Guide
The ATS-20 (and its updated ATS-20+ variant) is a portable full-band radio receiver based on the SI4732 chip.
Frequency Bands: Supports FM, AM (MW and SW), and SSB (LSB and USB). Controls: BFO Control: Used to clear up voice signals in SSB mode. Frequency Steps: Switchable between 1, 5, and 10 KHz steps.
Audio Filters: Adjustable bandwidth filters (0.5, 1, 1.2, 2.2, 3, and 4 KHz).
Charging: Powered by a 3.6V 800mAh polymer lithium battery, rechargeable via a standard USB port.
Audio Output: Includes a 3.5mm earphone jack and supports a 4-ohm or 8-ohm speaker. Manual Resources
Since official PDFs are rare, users often rely on documentation for similar models like the ATS-25, which shares many firmware functions.
Community PDF: A community-shared H-RADIO User Manual (PDF) for the ATS-25 is often used as a reference for ATS-20 firmware.
Firmware Updates: Many ATS-20 units can be updated using ESP32 flash tools to add features like better band scanning or refined SSB controls. Common Troubleshooting
Missing FM Mode: If the radio won't enter FM, check the band switch button; sometimes it requires a firm or repeated press to cycle through to FM.
Antenna Issues: For FM, the standard telescopic rod antenna is generally better than internal traces, which can introduce noise from the unit's electronics.
and its upgraded sibling, the , are compact, budget-friendly DSP receivers based on the Si4732 chip and Arduino Nano architecture
. Because these radios are often sold under various generic brands with differing firmware versions, their operation can vary slightly. Core Controls & Operation Tuning/Encoder Knob ats-20 radio manual
: Rotate to change frequencies. Press the knob (on most firmware) to switch between tuning steps (e.g., 1kHz, 5kHz, 10kHz) or to enter specialized modes like
(Beat Frequency Oscillator) adjustment for fine-tuning SSB signals. Band Selection
buttons to cycle through FM, AM, LW, and the various Shortwave (SW) bands. Mode Button : Cycles through modulation types: (Upper Sideband), and
(Lower Sideband). SSB (USB/LSB) is essential for listening to ham radio operators. Step Button
: Selects the frequency increment. Short presses typically cycle through standard steps, while a long press in some versions might display a signal strength bar. BW (Bandwidth)
: Adjusts the filter width to reduce noise or interference from adjacent stations. Key Features for Shortwave/SSB BFO Calibration
: In USB or LSB mode, press the tuning knob to activate BFO. This allows for ultra-fine adjustments (often in 10Hz or 20Hz steps) to clarify "Donald Duck" voices in SSB transmissions. AGC (Auto Gain Control)
: Press to toggle gain settings, which helps stabilize signal strength for clearer audio. Firmware Upgrades
Many users recommend flashing the radio with advanced firmware to unlock better performance and features: PU2CLR Library
: The foundational library for many versions, improving overall chip control. ATS_EX (Goshante Firmware)
: A popular "advanced" firmware that adds a cleaner interface, better battery monitoring, and removes "chuffing" (the brief audio mute when tuning). How to Flash : Most units connect to a PC via . You can use tools like Arduino IDE to upload new Quick Troubleshooting EEPROM Reset
: If the radio behaves strangely after a firmware flash, turn it on while holding the encoder button down to reset the memory to defaults. Antenna Performance : While the included telescopic whip is decent for FM, an external wire antenna
is highly recommended for picking up weak Shortwave or SSB signals. Are you interested in instructions for flashing a specific firmware version like Goshante or PU2CLR?
The ATS-20 (and the upgraded ATS-20+) is a portable full-band radio receiver based on the SI4732 chip. Official printed manuals are rarely included in the box, and users typically rely on community-shared PDFs or manuals for similar firmware (like the H-RADIO/ATS25 manual). Quick Start & Core Functions , and its successor the , are compact,
Most ATS-20 units use a rotary encoder and a few tactile buttons for navigation.
Power: Usually a physical toggle switch or a long-press on the encoder.
Band Selection: Press the Band button or the rotary encoder to cycle through pre-configured bands (FM, AM, MW, SW, and SSB).
Tuning: Turn the rotary knob. Pressing the knob often changes the Frequency Step (1kHz, 5kHz, 10kHz).
SSB/BFO: For Single Side Band (LSB/USB), use the BFO control to fine-tune the signal for clarity.
Bandwidth: You can cycle through audio bandwidth filters (0.5, 1, 1.2, 2.2, 3, and 4kHz) to reduce noise. Key Specifications
Display: 0.96" OLED showing frequency, signal strength, and settings.
Battery: Internal 3.6V 800mAh lithium battery, rechargeable via USB.
Audio: Supports 3.5mm earphones or an 8-ohm/1.5W internal speaker.
Antenna: Uses an SMA interface; many users find the stock telescopic antenna is best for FM, while wire antennas help with shortwave (SW). Community & Troubleshooting
Because the firmware is often open-source (based on Arduino/ESP32), many users update their devices to gain new features like Bluetooth or better SDR capabilities.
Missing Manuals: If your unit arrived without instructions, the ATS20/ATS25 Facebook Community is the primary hub for downloading the latest English PDF manuals and firmware updates.
Firmware Flashing: Updating the firmware (e.g., using ESPFlashDownloadTool) can fix bugs or add "Pro" features like AIR band reception. im looking for ATS-20 Diagram
To enter the Setup Menu, press and hold the Encoder Button (or sometimes a dedicated "Menu" button depending on firmware) for 2 seconds. Shortwave radio receiver with AM, FM, and SSB