[CQ-Contest] IARU - Join Us
dezrat at copper.net
Mon Jun 18 12:14:29 EDT 2007
On Sun, 17 Jun 2007 22:05:16 -0500, Jim George <n3bb at mindspring.com>
>Bill, I think that this is erroneous from a technical standpoint. RTTY
>signals are wide, and can not be removed with a 400HZ or 250HZ filter. They
>have inherent frequency shifting, unlike CW.
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With its 170 Hz shift, including sidebands, RTY occupies about 250-300
Hz of spectrum, depending on the sharpness of the keying waveform. CW,
depending on the speed and sharpness of the keying waveform, occupies
about 50-100Hz. CW is not a single frequency signal when the sidebands
generated by on-off keying are considered. Granted, RTTY is slightly
wider, but not much. Not nearly as much difference as CW/RTTY and SSB.
There is no reason to say they are incompatible other than operator
likes or dislikes.
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