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An inexpensive coax switch. shows a proven inexpensive home-made antenna selection switch. If you question the use of a cheap slide switch and SO239 coax sockets, read on. Measurements in a physics lab showed there to be practically no reflection on HF and even on 70 cm the SWR was below 1.3 : 1

PC power supply conversion for ham radio use. Slide show overview showing how convert PC Power supplies to ham radio use presented at the August 2007 FSARC meeting.

In these slides, differences between spiderbeam antenna and hexbeam antennas are explained comparing performances and measurements.

Excellent slides explaining radio and radiowaves generation basics

Over 45 years of dedicated work by Robert Sherwood, NC0B, culminated in a wealth of technical insights, particularly concerning **receiver performance** and the intricacies of transceiver design. The site provides access to numerous presentations from events like Dayton Contest University and W4DXCC, covering topics such as optimizing rig performance, the evolution of lab testing, and the impact of roofing filters on transmitted IMD and receiver characteristics. These resources offer detailed analyses and practical advice for serious operators and contesters. While product manufacturing, including the SE-3 MK IV synchronous detector and various Drake R-4C accessories like roofing filters and cooling kits, has ceased, the legacy of technical documentation remains. The site details specific products like the Icom IC-781 and R-9000, and offers insights into 455 kHz mechanical and crystal filters, along with DSP protection strategies. Crucially, the site features extensive receiver test data, allowing radio amateurs to compare the performance of various transceivers. This data, often presented in white papers and slide shows, includes detailed measurements and explanations of key performance metrics, serving as a valuable reference for understanding and selecting high-performance HF gear.

This is the downloads area for slides, plans and handouts for CARS Amateur Radio Licence Training Courses

Amateur Radio Youtube Channel with some picture slideshow compilations by VK5SW

Amateur Radio DXpedition to Huang Yan Dao (Scarborough Reef) in 1995, includes slideshow and dxcc country information

Adding a Software Defined Radio to an SO2R station

How new technologies affect the art of contesting by DH1TW

The Magloop Antenna Calculator was developed to predict the characteritics of a small-loop (aka magloop) antenna, given physical dimensions entered via slider widgets. This magnetic loop antenna calculator works also on most mobile devices, adjusting sliders and calculating dimensions in real time.

Some basic tips for successful QSLing, in particular when utilizing the services of a QSL Manager by W5UE

A series of slides, videos and handouts to help people get started in amateur radio in the UK.