Medium Wave and Short Wave DXing resources from the Kitchener/Waterloo Amateur Radio Club.
http://www.kwarc.org/swl/dx_mwswl.html
Devoted to Morse Code operation with QRP, much good reference material.
http://home.alltel.net/johnshan/
http://www.engr.sjsu.edu/rkwok/projects/amp_b1.PDF
Written for the MAC platform, and includes satellite tracking, logging DX cluster, spectrum analyzer and PacSat protocol software.
http://dogparksoftware.com/Macintosh_Amateur_Radio_Pr.html
This document has pictures and some basic information on BNC, TNC, N, UHF, C. SMA, SMB, SMC and APC-7.
http://nocat.net/connectors.html
By D. B. Leeson. Introductory guide to using 1/8 wavelength stubs in lowpass, bandpass, and bandstop microwave filters. Also briefly discussed are 1/4 wavelength coupled-line filters, interdigital filters, comb-line filters, impedance matching filters, di
http://home.sandiego.edu/~ekim/e194rfs01/filterek.pdf
Application notes from Faran.
http://www.farran.com/index.php?sc=4
http://www.interaccess.org/arg/arg-knowledge/MIDI.BS2
Presenting amateur radio information for beginners.
http://members.fortunecity.co.uk/mm5ajw/
over 100 simple radio circuits.
http://www.intio.or.jp/jf10zl/index.html