This Primer is a work in progress. Additional features and filters are added from time to time by Dirk Koopman, G1TLH, the developer behind DXSpider. So periodic revisions will be made to this document. If you have any questions, comments, or suggestions relative to this primer on spot filtering, please contact,
Jim Samuels, W3BG jimsam@comcast.net
or
Dave Hawes, N3RD (W3FRC Cluster SYSOP) dave.n3rd@comcast.net