Yagi antennas have long been popular as beam antennas for amateur radio. Here’s how they work.
How about putting some basic error codes in your product?
Is the lack of error codes in basic appliances an attempt to make repairs harder, or is there a deeper, safety-focused rationale here? After about five years of hard daily use, our undercabinet, no-frills GE-brand microwave oven stopped working (Figure 1). It did not die completely, as the user control panel and its keypad worked, […]
Demonstrating antenna diversity, Part 2: The PIFA
Antennas come in a broad range of sizes, styles, and configurations to meet frequency, bandwidth, directivity, and many other objectives; the PIGA and Yagi antenna are two different yet widely used versions.
Demonstrating antenna diversity, Part 1: The challenges
Antennas come in abroad range of sizes, styles, and configurations to meet frequency, bandwidth, directivity, and many other objectives; the PIGA and Yagi antennas are rather different yet widely used versions. With a few highly specialized exceptions, all antennas in general use – ranging from tiny ones in wearables to huge broadcast-transmitter designs – are […]
Untangling accuracy, precision, and resolution, Part 2: Implications
Accuracy, precision, and resolution are key parameters, each with a distinct meaning and implication with respect to system design and confidence. Design, test, and measurement implications Low or moderate accuracy may seem a detriment, but that isn’t necessarily the case. If precision is good enough and there is a way to calibrate the readings, the […]
Untangling accuracy, precision, and resolution, Part 1: Basics
Accuracy, precision, and resolution are key parameters, each with a distinct meaning and implication with respect to system design and confidence. To the average person, terms such as accuracy and precision are somewhat interchangeable, and that’s fine. However, they have very specific and different meanings as well as design and test implications for scientists, engineers, […]
Don’t let system complexity discourage basic troubleshooting
A somewhat justified concern about damaging a complex system can also intimidate you from a basic investigation into a system problem. OK, I admit it: I avoided checking for an obvious problem due to my fear of making things worse in a high-risk situation. Fortunately, the only cost, in this case, was to my pride. […]
What are digital twins, and where are they on the “hype cycle”?: Part 2
Digital twins are getting lots of deserved attention, but are they the cure-all for whatever simulation issues you have? Although digital twins are undoubtedly valuable tools along with basic simulation, modeling, HITL, and others, the associated all-good/no drawbacks promotion concerns me. When a tool, product, or other development gets a lot of “pumping up” to […]
What are digital twins, and where are they on the “hype cycle”?: Part 1
Digital twins are getting lots of deserved attention, but are they the cure-all for whatever simulation issues you have? Lately, I’m seeing what are called “digital twins” cited everywhere. What is a digital twin? In addition to having that very catchy name, it is a highly advanced model of the system which can be used […]
MOSA and SOSA join the lexicon of military frameworks: Part 2
These two military-focused architectural standards provide approaches to system-level development and sensor-centric designs. The previous part of this article discussed the Modular Open Systems Approach (MOSA) Reference Frameworks in Defense Acquisition Programs. This part looks at one realization via the Sensor Open Systems Architecture (SOSA). Q: What is SOSA, anyway? A: (Warning: there’s a lot […]
