My receiver BW is about 500Hz in CW. Even so, some operators are so far off that I have to re-tune to hear the responding station who may be on the top or bottom edge ( or beyond) the BW!
What's up with that? BTW, I'm not talking about splits here, just a normal QSO.
Is it considered impolite to ask the responding station to zero beat your frequency? The ops I've heard just seem to ignore it.
In the evolution from separate tx and rx setups to transceivers, the issue of two stations transmitting cw on the same frequency has been an issue. Some early transceivers such as the KWM-2 or SB101 had neither RIT or an adjustable cw offset freq. If you tuned in a sig to a reasonable pitch to listen to, you were off freq (to the other station) when you transmitted. He'd retune a bit to hear you and then would be off freq (to you) when he transmitted. So the two would go leap frogging down the band. Various schemes have been incorporated over the years, but many popular transceivers still on the air are SSB orientated with CW as a second thought and are not convenient or easy to ensure you're on freq when you call.