LA6NCA Larvik, Norway

HOMEBREW

SDR RADIO

I learn about SDR radios at NRRL’s ham meeting in this summer.
When I come home I started developing my own SDR.




Here is my prototype. Very few components.



Here is my PCB.
BNC is the Antenna input.
The two phono connectors is the I and Q audio outputs.
My RDS have two possible oscillators.
One 455 kHz on board oscillator and one input for external oscillator.
Can be selected by the reed switch.




Very few components are used.
Two super low noise microphone preamps is the audio gain stage.
The mixer is a mux from Analog Devices.





Here is my SDR connected to an oscillator from K5JHF and K5BCQ.





I have Produced a large box with SDR radios.



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