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SDR Receivers for VHF/UHF bands
All published designs and materials are free for personal and non commercial use. Other use for commercial purpose are not allowed without permission of the author.
HF/VHF/UHF SDR receivers with LO at receiving frequency
Many HAM like to try new SDR technique at higher VHF/UHF frequencies. This task direct receiving is not so easy except to use standard super-heterodyne RX with HF IF where we can use new SDR technique. This design is with double balanced diode mixer as demodulator. First part describe some theoretical problems and I publish few version HF.VHF/UHF SDR receivers without image rejection.
HF-VHF-UHF SDR receivers-YU1LM part1.pdf