Zeta SDR

Zeta SDR is a simplest SDR using analog mux/demux used as mixer to generate I and Q signals by mixing with oscillator signal of 45 degree phase shift, the IF signal is then passed through low pass filter. The circuit is from the web page http://www.qrz.lt/ly1gp/SDR/.

The basic block diagram is shown below.

RTL SDR Upconverter for T820 Series

Realtek RTL2832U DVB-T dongles can be used as a cheap SDR. As a DAB/DAB+/FM demodulator it’s possible to fetch 8-bit I/Q-samples from RTL. Moderate low loss sampling rate of 2.56 MS/s is suggested even the device can support upto 3.2 MS/s. For more information check official page of rtl-sdr.

85-950MHz Analog AM /WFM /NFM Receiver (DE_JUNK_BEE)

MY FIRST VHF RECEIVER ...!!!

      This is a receiver build using the Analog TV tuner used in old television sets. Its capability and real application limits it to receive analog signals only. I have done some modification to the circuit to make it more selective and flexible. The inspiration that I got to build this circuit comes from the "link" .