SI4732 All Band Radio Receiver FM AM (MW & SW) SSB (LSB & USB)
Use a 3.6v lithium battery
Support USB charging
Audio output supports headset 3.5MM
Support 8 ohm speaker 1W output
The PCB retains the SI4735 package, users can replace the chip by themselves, and the software is compatible
Features of this sketch:
1) FM, AM (MW and SW) and SSB (LSB and USB);
2) Audio bandwidth filter 0.5, 1, 1.2, 2.2, 3 and 4Khz;
3) 22 commercial and ham radio bands pre configured;
4) BFO Control; and
5) Frequency step switch (1, 5 and 10KHz);
Band band[] = {
{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 mters
{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