This instrument measures complex impedance over the 1. 6 - 33 MHz HF spectrum. It also calculates and displays the VSWR of the impedance referenced to 50 ohms. The most common application of the meter is as an antenna analyser. The design was published in `Break-In`, New Zealand`s amateur radio magazine in Jan/Feb 2006, and is republished here with
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the permission of the editor. Note: `Break-In` is a term used in amateur radio to describe a system which allows another person`s signal to be heard in the brief intervals between transmitted Morse Code symbols. Why is it that having reached the top of the mountain and just begun to enjoy the rewards of the climb, you realise that there`s another peak just that little bit higher to be seen in the distance Such was the case a month or so after I completed an analog antenna analyser. The analog meter did everything demanded of it, but there were times when a little more information would have been useful. I`d seen the next mountain top. (The analog meter is described on another page on this website) I discovered, for example, that there are times when full information about the complex impedance being measured can be useful. An impedance is made up of two components; the real or resistive part, R`, and the reactive part, X`. The reactive component may be capacitive or inductive. Complex impedance can be displayed in two ways; Either as a magnitude plus a phase angle (i. e. A magnitude of "A" ohms at a phase angle of "B" degrees) or as a series combination of real and reactive components (i. e. C +/- jD ohms) where j` indicates the value of "D" is reactive. If "D" is positive, the impedance is inductive. If negative, the impedance is capacitive. While it is possible to measure and display these components of a complex...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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