A RF spectrum analyzer is one of the most useful tools an experimenter can have. The spectrum analyzer project shown here will be a slight improvement on the ` Spectrum Analyzer for the Radio Amateur ` ( Part 2 ) project from Wes Hayward (W7ZOI) and Terry White (K7TAU) which was covered in the August and September issues of QST magazine. There will
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also be a few ideas taken from the Scotty`s Spectrum Analyzer project by Scotty Sprowls, most notably, his really nice first IF (1013. 3 MHz) bandpass cavity filter. You must read and study carefully the " Spectrum Analyzer for the Radio Amateur " article before embarking on this project, as it covers some of the more in-depth concepts and construction notes which will not be covered here. Wes Hayward also has several " Spectrum Analyzer Update " PDF files on his website which should also be studied as they include a number of tweaks and improvments to his design. These update files also include the necessary final IF/logarithmic amplifier calibration information. Most of the components used in this RF spectrum analyzer project were obtained from ham radio swapfests or salvaged from old two-way radios, cellular phones, or cable TV distribution gear. Some components may be hard to track down, but equivalent parts can be substituted with minor tweaking of the circuits. No PCB patterns will be provided as all the PC board layouts were done by hand using Sharpie markers and a straight edge. You`ll want to keep the PC board traces as short as possible and utilize a large ground plane and isolate the RF inputs and outputs. The PC boards were all made from double-sided (1 oz. ) 1/32-inch FR4 material. The key to building a high-performance RF spectrum analyzer is isolation and shielding. Construct the spectrum analyzer as a series...
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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