Combine an inexpensive transceiver, some free software and you`re on PSK31 at a rock-bottom price! Add to that the fun and pride of building the transceiver and you`ve got a n irresistible package! I is a relatively new I digital mode, created Iby Peter Martinez, | G3PLX, and covered in detail in QEX. 1 Because of its narrow bandwidth requirements
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and the Viterbi decoding built into the mode by Peter, PSK31 is ideally suited to Amateur Radio digital communications using low power. However, the narrow bandwidth of the PSK31 signal ”31. 25 Hz ”makes tuning PSK31 signals somewhat more difficult than tuning SSB and CW signals, because accurate tuning to within only a few hertz is necessary for proper decoding. This requirement has resulted in several attempts to make tuning easier, such as the PSK31 tuning aid described by Don Urbytes, W8GLV, 2 and the phase scope and waterfall display Peter included in his popular introductory software for PSK31. It was during an e-mail exchange with Peter that I hit on the idea of eliminating the need for tuning altogether! The concept of the Panoramic Transceiving System for PSK31 was born. As Steve Ford, WB8IMY, put it so well in his article, "PSK31 ”Has RTTY`s Replacement Arrived ", 3 PSK31 signals don`t deedle-deedle like RTTY signals, or chirp like the TOR modes, they warble, sounding like high-pitched, warbling carriers as you tune across them. If several PSK31 stations are operating close together, they sound like a bunch of caterwauling alley cats! It is virtually impossible to separate the individual stations by ear, as the human hearing cannot distinguish between different tones very close together in pitch, so some other technique must be used to separate stations and the best way to do it is visually*. PSK31 stations are...
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....
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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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