The OTHER GUY makes sure that he transmits Mark on the higher RF 
frequency and Space of the lower RF frequency with a 170 Hz 
shift.  You do not care whether he does this on USB or LSB.  At your 
end YOUR equipment requires 2125 and 2295 for Mark and Space 
respectively,  it is YOUR responsibility to tune and set your rig for 
LSB for an audio output with the proper frequencies.  If this is 
done, then the RF frequency for Mark will be the same for both 
stations and is the proper frequency to report for logging, and 
setting up a sched.  Some software (MiXW) would require the receiving 
end to be in USB for this same scenario.  What I think happens with 
new RTTY users who use MixW, are told that AFSK RTTY is ALWAYS on 
LSB, so when they send, their tones are reversed.  With MixW, the 
default is to send and receive USB.  This default puts the Mark and 
Space RF frequencies in the proper place.  An ST-6 user would still 
send and receive on LSB.

I looked back at the archive, we discusses this in October of 2005, I 
thought I was having deja vu.

>The ST-6 is looking for a mark tone of 2125 and a space of 2295.
>If for some reason the other guy is on USB but still with 2125 &
>2295 tones I can flip the reverses switch and copy him just fine.
>
>If he is using a TNC that has the 200Hz shift I can't copy.



Need a Digital mode QSO? Connect to  Telnet://cluster.dynalias.org

Other areas of interest:

The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/
DigiPol: http://groups.yahoo.com/group/Digipol  (band plan policy discussion)

 
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