Most frequency counters can tolerate only low levels of RF at their input, but here’s a way to safely measure the frequency of an RF signal of up to 200 watts with your existing frequency counter.
There are a lot of technologies that got a start on some ham’s wireless workbench. Ham radio almost demands tinkering and inventing. Some creations get no farther than a one-time project, while others become the basis for companies and industries.
Rarely has there been as much interest in a high frequency radio as that shown to the Microbitx. Low power enthusiasts — better known as QRP operators as well as ham radio hobbyists — have rushed to place their order for this exciting and challenging new transceiver kit. Challenging in that it’s had a problematic chip “on its shoulders.”
Filters are one of the most important and widely-used circuits in all of radio at any frequency. Understanding how they are specified and used will make you a better electronics designer, whether you build your own or simply buy them from a vendor.
For audiophiles, musicians, and ham radio operators, the soft glow of the vacuum tube filament is not only an indication of function, but a nostalgic trigger for memories of simpler times. Though they may have been outpaced by tiny transistors and integrated circuits, these workhorses still may have something to offer in many modern devices.
For low frequency control, switching, and DC power, it is possible to get the job done without worrying too much about wiring and cabling practices. However, when RF gremlins begin to appear, suddenly, a whole new set of cautions and constraints gets piled on to your “simple” project. This article provides an overview of shielding, including some practices you should know as a defense against these gremlins.
The phenomenon known as RF interference — RFI to its many friends and acquaintances — involves interference caused by signals propagated wirelessly as radio waves. Most people don’t know (or care) about RFI until their garage door opener won’t work.