![]() ![]() ![]() Then, a full-wave rectifier and peak detector is used as a linear detector converting the RMS value of the VLF station to a DC voltage level. A buffer provides an optional carrier output with a 50Ω impedance. It has a gain adjustable between 0 and 10. The following section is the RF post amplifier. The MAC275 is configured as a bandpass filter center frequency, gain and Q are adjusted by resistors. The MAX275 is a continuous-time 4th-order active filter. The signal is then filtered in the tuning section. The RF pre-amplifier section is built around one non-inverting amplifier with a gain of 21 and two inverting amplifier stages with gains adjustable between 0 and 25. The signal from the antenna (usually a loop antenna) is filtered out to limit the signals to the frequencies of interest in the VLF and lower-LF frequency range. The basic principle of the SID receiver is to measure the amplitude of a VLF station and to convert it to digital data. ![]()
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