Hello David, a rough simulation of that SDR design predicts a rather deaf radio: Total noise figure = 38 dB, MDS=-95dBm @ 12,5kHz System BW, Input IP3 = -20 dBm. I would suggest at least a 20 dB preamp with high IP3 performance in front of the ADC. So you will achieve a MDS of -114 dBm. Sure no splendid value, but will detect some VHF signals, hi.
73, Helmut, DC6NY -----Ursprüngliche Nachricht----- Von: David Rowe [mailto:[email protected]] Gesendet: Dienstag, 24. Februar 2015 22:16 An: [email protected]; [email protected] Betreff: [Freetel-codec2] Simple SDR for VHF FreeDV Hello, To support VHF FreeDV developments I've been working on a really simple and very open SDR architecture for VHF radio: http://www.rowetel.com/blog/?p=3884 Glen and Matt - would appreciate you suggestions on appropriate input BPF filtering and a VHF mixer. Also pls let me know if you see any show stoppers in this architecture. Cheers, David ---------------------------------------------------------------------------- -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
