well more speaking of wide sidebanded signals not so much on audio harmonics
--- In digitalradio@yahoogroups.com, "Graham" <g0...@...> wrote: > > I would say its down to the audio set up at the tx station .. too > much audio and you start to see the IMD close in .. then if the > originating tone is under say 1500 hz then you normally see 2 > decodes , one from the fundemental and the next from the 1st > harmonic, if the line in is up full as well then the sound card over > loads and makes you look wide as well > > As to what they have adjusted who knows ! even they dont hihi > G .. > > > > > > --- In digitalradio@yahoogroups.com, "kf4hou" <kf4hou@> wrote: > > > > This is only a theory , but i like to have some input on this. > > > > I have noticed on using bpsk31 some stations can be very wide at > > times. I can give them a report they are wide and they also tell me > I > > am wide. but the next day they look clean to me and they have not > > touched anything Why is that I asked my self. And speaking about > the > > type of stations that even have imd meters. > > > > My theory is this you know how you get ghosting on analog TV caused > > my multipathing, and how someone can sound if they are multipathing > > into a repeater were they sound very distorted like they are off > freq > > some? > > > > Well could you not have some of the same effects on bpsk31 on hf, > mf ? > > > > Especially in them cases where you have a local station on the > lower > > bands where you have ground wave and sky wave meeting slightly > > different in time and like on HF bands where you can have > > multipathing or selective fading would you not have some type of > > distortion added to signals? > > > > Also I can not grip on the idea of phase distortion as well, can > > someone break that down to me? > > > > Seems like to me also I have noticed that QPSK does not have this > > problem as much as well, Why is that? > > > > I also understand about people having over driven audio as well and > > lousy soundcards , but seems like some days people's audio are > awful > > in general and the next day, in general most people look fairly > well. > > I also understand the noise floor vs. signal strength and hide some > > of the bad audio effects out there as well. > > > > I would like to have some input on this to see if I am even close > or > > not. > > >
