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" <kf4...@...> 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. >
