Full-band Radio Receiver FM/AM/MW/SW/SSB(ATS-20)

1. Uses the ATS-25 encoder, offering a longer lifespan and better feel.
2. Added FM amplifier and M filter.
3. Uses the ATS-25 knob cap.
4. Added a TYPE-C port; FM output supports headphone antennas using a BNC antenna connector.
5. Uses a 3.6V lithium battery with USB charging.
6. Supports audio output with 3.5mm headphones and 1W 8-ohm speakers.
7. PCB retains the Si4735 package, allowing users to replace chips and ensuring software compatibility.

Package List:
1. Main unit
2. Telescopic antenna
3. TYPE-C charging cable
4. Lens cleaning cloth
5. Corner pads

Frequency Bands:
{FM_band_type, 8400, 10800, 10430, 10},
{Lw_band_type ,100,510,300,1},{Mw_band_type,520,1720,810,10},
{Sw_band_type, 1720, 3500, 1900, 1}, // 160 meters
{Sw_band_type, 3500, 4500, 3700, 1}, // 80 meters
{Sw_band_type, 4500, 5500, 4850, 5},
{Sw_band_type, 5500, 6300, 6000, 5}, {Sw_band_type, 6300, 7800, 7050, 5}, // 40 meters {Sw_band_type, 7800, 10000, 9600, 5},
{Sw_band_type, 10000, 11000, 10100, 1}, // 30 meters
{Sw_band_type, 11000, 12500, 11940, 5},
{Sw_band_type, 12500, 13900, 13600, 5}, {Sw_band_type,
13900, 14500, 14270, 1}, // 20 meters
{Sw_band_type, 14500, 15900, 15300, 5},
{Sw_band_type, 15900, 17900, 17600,5},
{Sw_band_type, 17900, 18300, ??18100, 1}, // 17 meters
{Sw_band_type, 18300,??21900, 21200, 1}, // 15 meters
{Sw_band_type, 21900, 26200, 24940, 1}, // 12 meters
{Sw_band_type, 26200, 27900, 27500, 1}, // cb band (11 meters)
{Sw_band_type, 27900, 30000, 28400, 1} //; // 10 meters