[Skimmertalk] Soliciting New Patterns for the RBN
n4zr at comcast.net
Thu Dec 26 17:00:10 EST 2019
During January, I plan to publish an updated patt3ch.lst file for the
Reverse Beacon Network. Forgive me if you know this already, but the
purpose of the pattern file is to improve the accuracy of CW spotting by
the RBN, by distinguishing between the "shape" or pattern of legitimate
callsigns and other strings that may appear on the air that look like
callsigns, but are not. Cw Skimmer Server does this by comparing each
string of received CW with a pattern file that lists "real" patterns,
which includes prefix, the first number following the prefix, and then
wildcards for additional numbers (#) and letters (@). Depending on
whether a pattern is rated by the file as common or less common, or is
omitted from the file altogether, Skimmer Server will require two, three
or more repetitions within a specified-length string of characters
before it decides "Yes, spot that call."
Call-sign patterns should be included in the pattern file if they have
been used or will be used in the future - for example, the pattern
PJ4@@, had been in use for years, but when active contesters were
granted calls in the pattern PJ4@ , we were happy to add that pattern to
the file. We'll treat similarly any administration's publishing special
callsign patterns that it is willing to issue for future operations,
such as contests. Conversely, we will be more skeptical about an
unusual pattern that has been used in the past for a particular
commemorative event, for example 8J##@@@@, or a similarly complex
pattern for a one-time commemorative event in the future.
The reason for this "drag on the system" is simple - if every possible
pattern from A@#@ to ZZ####@@@@ were included in the pattern file, then
the pattern file's usefulness would dissipate, since every "string"
would fit one pattern or another.
So, help us do a better job, and help yourself by reviewing the current
pattern file (at http://www.reversebeacon.net/pages/patt3ch.lst+36)and
letting us know what needs to be added.
73, Pete N4ZR
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