Collaborate Disseminate
As far as hobbies go, ham radio tends to be on the more expensive side. A dual-band mobile radio can easily run $600, and a high-end HF base station with …read more Continue reading Few Things Are Cheaper than This Antenna
[Hans Rosenberg] knows a thing or two about RF PCB design and has provided a three-part video demonstration of some solid rules of thumb. We will cover the first part …read more Continue reading A Simple Guide to RF PCB Design
Unless you hold a First Degree RF Wizard rating, chances are good that coax stubs seem a bit baffling to you. They look for all the world like short circuits …read more Continue reading Coax Stub Filters Demystified
Submitting a new device for electromagnetic compatibility (EMC) testing seems a little like showing up for the final exam after skipping all the lectures. You might get lucky and pass, …read more Continue reading Homebrew TEM Cell Lets You EMC Test Your Own Devices
A common joke in electronics is that every piece of wire and PCB trace is an antenna, with the only difference being whether this was intentional or not. In practical …read more Continue reading When Does Impedance Matching a PCB Trace Become Unavoidable?
Dipole antennas are easy, right? Just follow the formula, cut two pieces of wire, attach your feedline, and you’re on the air. But then again, maybe not. You’re always advised …read more Continue reading The Dipole Antenna Isn’t as Simple as it Appears
We always enjoy a [FesZ] video and we wonder if the “Z” stands for impedance? That’s the topic of his latest video series: measuring impedance with LTSpice. Of course, he …read more Continue reading Measuring Impedance Virtually
RS485 is a communication standard that should be part of the advanced hardware hacker’s arsenal; it’s not commonly encountered, but powerful exactly when you need it. It’s a physical layer …read more Continue reading Hacker Dictionary: RS-485 Will Go the Distance
There are a few classic physics problems that it can really help to have a mental map of. One is, of course, wave propagation. From big-wave surfing, through loudspeaker positioning, …read more Continue reading Impedance Mismatch
Using circuit simulating software like SPICE can be a powerful tool for modeling the behavior of a circuit in the real world. On the other hand, it’s not always necessary to have all of the features of SPICE available all …read more
Continue reading Circuit Impedance Calculations Without Cumbersome Simulations