M1GEO 2m Power & VSWR Meter for LDMOS 1kW Amp скачать в хорошем качестве

M1GEO 2m Power & VSWR Meter for LDMOS 1kW Amp

Very quick lash up test. Uses W6PQL filter and directional coupler, with 100W test signal. The op-amp circuit uses a single rail dual opamp (LM358) with a 5V rail from the Arduino. The two channels are each configured with a gain of -10. This takes the small negative voltages from the directional coupler on the W6PQL board, and makes them positive for the Arduino's ADCs. The W6PQL board states to terminate the line in 3kOhm for best linearity, so the input impedance of each gain stage is a 3.3kOhm resistor, with a 33kOhm feedback resistor, for a gain of -10 in the standard inverting-opamp configuration).