Check the listing for details. Automatic Band Decoder 1-100 MHz, RF sampling, STM32G CPU based. Condition: New. Listed at 35.00 USD. Description This board provides automatic band switching capabilities for LPF and antenna switches for any radio rig and amp. The main principle is to count the RF frequency during tuning and use the STM32G CPU as a frequency counter and switch. Device works like this: 1. Set output to highest band 2. Wait for PTT (GND active) to be activated 3. Once PTT activated, wait for RF to appear 4. Measure incoming RF, AMPL LED lights on a successful measurement (return to the beginning on error) 5. Set the output according to measured frequency 6. Relay activation time delay 7. Set output PTT (AMPL, GND active) 8. Wait for PTT to be released 9. Go back to waiting for PTT Board has 2 version, according to – IARU REG1 HF HAM bands plan – US HF HAM bands plan (by default). Both versions are assigned 21 Mhz, 24 Mhz, 28 Mhz bands to the one output – B7 Note me version you want at checkout, I will ship US version by default Also you can order personal map of bands TECHNICAL SPECIFICATION Power supply +7-15V, 50mA max Input RF impedance – >=1 kΩ, can be connected directly to 50 Ohm output Maximum input frequency – 100 MHz RF Sensitivity – 3V RMS, it is 0.2W RF power at 50 Ohm load Maximum RF input – 25V RMS, it is 12.5W RF power at 50 Ohm loadNominal RF input - 10V RMS, it is 2W RF power at 50 Ohm load Number of 50V/100mA outputs – 8 Board sizes 60×50 mm