RF sampling Automatic Band Decoder 0.1-80 MHz


Automatic Band Decoder


This board provides automatic band switching capabilities for LPF and antenna switches for any
radio rig. 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
Also you can order personal map of  bands



Power supply +7-15V, 50mA max
Input RF impedance – >=1 kΩ
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 load
Number of 50V/100mA outputs – 8
Board sizes 60×50 mm


Additional information

Weight 0.015 kg


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