[CQ-Contest] Can you not hear me now?

[Jim Brown]

On Thu,6/15/2017 10:15 AM, John Geiger wrote:
> You bring up a good point about digital modes Tor.  From watching the DX
> cluster, it seemed that quite a few stations probably spent most of the
> contest on 50.276 running JT65.  Also, how do you keep from QRMing each
> other when several stations are all on 50.276?

Because they're NOT all on 50.276 -- each station occupies about 200 Hz 
of the 2.7 kHz bandpass of a typical USB circuit, AND WSJT-X is capable 
of decoding stations that overlap each other (and are nearly on top of 
each other). 50.276 is simply the suppressed carrier frequency -- the 
signals are spread out between about 50.2763 and 50.2788. JT9 occupies 
even less bandwidth -- about 20 Hz -- and has a few dB greater noise 
immunity. JT9 and MSK144 can be used with much shorter TX-RX sequences 
as well.

These digital protocols and the associated operating practices are well 
described in the tutorial for the WSJT-X software.  Google to find it.

73, Jim K9YC