Hi, I agree with Alfred and can't see any necessity for tuning. Mode 700B provides a constant offset of 700Hz starting from zero beat and everybody should be able to control the frequency of his radio with a deviation of some Hz. It's also clear that the SSB channel should be at least 2400Hz wide and the frequency response flat, i.e. no usage of equalizer, compander, compressor etc. Where is the problem?
73, Helmut, DC6NY -----Ursprüngliche Nachricht----- Von: wully [mailto:[email protected]] Gesendet: Dienstag, 15. September 2015 09:20 An: [email protected] Betreff: Re: [Freetel-codec2] Tuning Aid 700B mode I have not noticed any problem tuning the 700B mode. I am using a narrow filter from 700 to 2400 Hz in the SSB-passband. From the very few experiments we could do with dc6ny we noticed, that the locking to the 700B is faster than it was with the 1600 mode (just qualitatively, not measured). 73, hb9epu, Alfred On 15.09.2015 03:17, Peter Reichelt wrote: > David and list > As tuning is more critical on the 700 mode as compared to the 1600 mode and there is an absence of a distinct central carrier then a couple of extra tick marks on the FreedDV GUI showing the edges of the signal, when correctly tuned, as well as the centre would provide easier tuning of signals using coherent psk modes. Note this is compounded by having an even numbers of carriers where correct tuning is with the centre tick mark between the 7th and 8th carriers,not aligned with a carrier. It is easy to select the mid point between the wrong carrier pair. > regards > Peter VK5APR > > ---------------------------------------------------------------------------- -- > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ---------------------------------------------------------------------------- -- _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
