An interesting article on loading short vertical monopole antennas, representing six different methods. Base loading, Center Loading, Top Loading, Continuous loading, half and half loading and capacitive top loading.
In his page the author includes 27 mp3 audio files that compose the whole CW training course, instructions and whole lessons transcript are available in Italian and English.
Results or performance test using an harpin antenna for the 7 MHz
The TangerineSDR is a Modular Software Defined Radio Project with the following objectives, Development of SDR radios that allow experimentation, provide support to unaffiliated other groups, to provide hardware modularity, to allow varying performance, To allow users to experiment with differing configurations.
DXFILE is an advanced log management program for radio amateurs. It allows complete management of amateur traffic and much more. Available only in French. Windows Shareware
Developed for beginners, hobbyists, and field engineers. Includes polar plots, rectangular plots for input impedance and VSWR, tabular data, NEC-Win Synth Light and Necvu 3D. Includes NEC2. The program also offers stepped-diameter corrections, Gain Averaging Test, CAD (.DXF) file input, 2-D and 3-D plots and antenna views, and graphical outputs. Run on older Windows version and is out of support.
This freeware application for Linux and windows, allows you to convert an ADIF file to a KML file so you can map your QSOs easily and open it with google maps, or google earth or any application supporting the KML format