ATS-20 (and ATS-20+) is a compact, DSP-based all-band radio receiver powered by the chip. While it is highly capable for its price, users often find the included documentation sparse. Core Operation Guide Most ATS-20 models use a similar interface controlled by physical buttons and a rotary encoder (tuning knob). ひろくんのホームページ Power On/Off : Press and hold the power button for approximately Band Selection buttons to cycle through FM, AM (MW/LW), and Shortwave (SW) sub-bands. Mode Switching : Press the button to toggle between AM, USB, and LSB (Single Sideband) for ham radio listening. : Rotate the TUNE/BFO/ATS knob. Press the button to change the tuning increment (typically 1kHz, 5kHz, or 10kHz). : Use dedicated VOL+ / VOL- buttons. On some firmware versions, a short press of the encoder knob also enters volume mode. Mastering SSB (LSB/USB) Tuning For clear reception of ham radio operators: Set the mode to Tune to the desired frequency. TUNE/BFO/ATS knob to enter BFO regulation mode. This allows for fine-tuning the voice clarity (typically in 10Hz or 25Hz steps). ひろくんのホームページ Advanced Features & Hidden Menus The radio's potential is often unlocked through community-developed firmware like Goshante (ATS_EX) Bandwidth (BW) : Press the BW button to toggle filters (0.5, 1.0, 1.2, 2.2, 3.0, or 4.0 kHz) to reduce interference in crowded bands. AGC Control Automatic Gain Control to maintain consistent audio levels. EEPROM Reset : If the radio behaves erratically after a firmware update, hold the Encoder Button while powering it on to reset all settings to default. Frequency Scanning : Long-press the button or click the encoder (depending on firmware) to initiate an automatic scan. Quick Troubleshooting

Since the official ATS-20 and ATS-20+ documentation is often limited, enthusiasts typically rely on community guides and firmware-specific documentation to get the best performance. Quick Start Guide Initial Setup : Attach the rubber feet for stability, screw the telescopic antenna into the "ANT" port, and charge via the USB Type-C port until the LED indicator changes. Switching Bands : Short press the BAND+ button to enter selection mode, then rotate the encoder knob to choose your desired band (FM, AM, LSB, USB, etc.). Fine Tuning : Use the Step button to select your tuning increment, then rotate the TUNE/BFO knob to dial in the frequency. Advanced Features & "Hidden" Settings Many units come with or can be upgraded to Goshante's ATS_EX firmware or similar versions, which unlock deeper settings: Soft Mute (SM) : Adjustable from 0–32; lower values reduce the "chuffing" silence between tuning steps but may increase noise while rotating the knob. Sync Mode (Syn) : Can be enabled for SSB to help stabilize reception of shifting signals. Bandwidth (BW) : Press the BW button to cycle through filters; narrower settings help reduce interference from nearby stations. Essential Tips for "Better" Performance The "Hand" Effect : The radio's sensitivity often drops when you set it down. A common fix is using a BNC-to-banana adapter with external copper wires to act as a simple dipole antenna, which reduces noise interference. Power Source : Use battery power whenever possible. Charging while listening often introduces significant mains hum and electronic noise into the receiver. Documentation : If you need a more detailed English manual, many users recommend the ATS-20+ Advanced Firmware User Manual for detailed button maps and setting definitions. Lets upgrade the ATS 20+

Overview The ATS-20 is a portable, battery-powered shortwave radio receiver designed for casual listening and serious radio enthusiasts. It features a digital tuning system, 1710 memories, and a range of 150 kHz to 30 MHz. Key Features

Frequency Range: 150 kHz to 30 MHz Digital Tuning: 1 kHz steps Memory Capacity: 1710 channels Modes: AM, FM, and SSB (Single Side Band) Power Source: 4 x AA batteries or external power supply Display: LCD display with frequency, mode, and signal strength indication

Operating the ATS-20 Radio

Power On/Off: Press the power button to turn the radio on or off. Frequency Selection: Use the numeric keypad or the up/down buttons to enter a frequency or select a stored channel. Mode Selection: Press the mode button to toggle between AM, FM, and SSB modes. Volume Control: Adjust the volume using the volume buttons. Tuning: Use the tuning buttons to adjust the frequency in 1 kHz steps.

Advanced Features

Memory Channels: Store up to 1710 channels in 9 banks of 190 channels each. Scan: Automatically scan through stored channels or a range of frequencies. Lock: Lock the radio to prevent accidental changes to settings.

Troubleshooting

No Power: Check battery installation, battery condition, and external power supply (if used). No Signal: Check antenna connection, antenna type, and signal strength. Interference: Adjust antenna position, use a different antenna, or adjust receiver settings.

Specifications

Frequency Stability: ± 10 ppm Sensitivity: 10 μV (AM), 5 μV (FM), 2 μV (SSB) Selectivity: 6 kHz (AM), 12 kHz (FM), 2.7 kHz (SSB) Audio Output: 1 W (8 Ω)