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Re: [CQ-Contest] Ingenious prefixes and the RBN

To: cq-contest@contesting.com
Subject: Re: [CQ-Contest] Ingenious prefixes and the RBN
From: John Unger <w4au@verizon.net>
Date: Wed, 18 Apr 2018 16:26:41 -0400
List-post: <mailto:cq-contest@contesting.com>
Gee, does this mean that folks will actually have to tune the radio, listen to the station, and copy the "ingenious" prefixes correctly rather than just clicking on a spot...:-)
73 - John, W4AU


On 4/18/2018 8:46 AM, N4ZR wrote:
This may be old news to many of us, but VE3NEA's CW Skimmer Server 
determines how "skeptical" to be about a callsign, based on a file of 
all expected callsign patterns. This assessment in turn affects how 
many repetitions of a callsign it must "hear" before issuing a spot.
From time to time, this causes problems for contesters who have gone 
out of their way to get a truly unique callsign for use in contests 
like CQWPX.  For example, normal Belize callsigns are V31@@ (where @ 
is an alphabetic wild card), but I have recently been told about the 
issuance of a V3@ callsign for contest use.
Revising the callsign pattern file in a truly systematic way involves 
getting data from QRZ.COMon the number of "hits" for each callsign and 
massaging the data with exotic techniques (exotic to me, anyway) to 
turn callsigns into patterns and aggregate the numbers of hits to 
determine how common the pattern is.  It's a lot of work.
With a little time remaining before CQWPXCW, I'm offering an interim 
fix.  If you have received what you believe to be a unique prefix and 
have not used it before March, 2017 (the last systematic overhaul of 
the pattern file) e-mail me by May 1 and I will incorporate the new 
pattern in the RBN's pattern file distribution, which will be made 
available to all RBN nodes by May 10.  I can't promise you that all 
node-ops will download the new file before the contest, but the server 
will at least "nag" them to do so.

73, Pete N4ZR

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