At 08:14 AM 10/1/06, Andrew O'Brien wrote:
>With many RTTY folks using software that provides a graphical image of
>received signals (.e.g a "waterfall"), spotting other stations within
>the RTTY bandwidth is fairly easy. When you finish transmitting and
>see signals within a couple hundred Hz of where you are parked, unless
>they are coming back to you..they might be folks already using the
>freq (or have just "stolen" your freq).
That operators are expected to recognize the potential for
interference with a signal that is audible (or visible) is a
reasonable assumption.
For the not insignificant fraction of RTTY contesters using radios
with cascaded 250 Hz IF filters and the like, there's precious little
to be heard, or to be seen on a waterfall display, from stations that
are a couple of hundred Hertz off the center of their receiver's passband.
Listening and hearing nothing does not ensure that one's selection of
an operating frequency will not be perceived as interfering by those
employing different means of reception.
73,
Mike K1MK
Michael Keane K1MK
k1mk@alum.mit.edu
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