Spectrum

173 links - and 4 categories

Space-Efficient Excellence: Inverted L Multi-Band HF Antenna - Discovering a solution for limited space, the inverted L HF antenna emerges as a stellar performer. Half the size of a dipole, it ensures optimal installation in restricted areas, maintaining superb transmission (TX) and reception (RX) characteristics. Spectrum Communications' multi-band version, featuring traps, proves even more space-friendly without compromising performance. A fiberglass pole offers sturdy support, while proper grounding, an RF choke, and occasional tuning contribute to a high-performing and reliable antenna system.
[ Hits: 188 | Votes: 0 | Rating: 0 ]

Ribbit digital text messaging mode for HF/VHF/UHF - Ribbit is a novel digital text messaging mode for VHF/UHF communications for recreational and emergency use which radically increases the density of information transmitted by spectrum used. It leverages the computing power of the modern smartphone to increase the capabilities of any Handy Talkie without requiring any additional hardware or cable. A Ribbit message is fixed in duration at 1250 milliseconds. It is sent over audio modulation with a 2kHz bandwidth centered on 1.5kHz. It is preceded by 400ms of white noise to open analog squelch circuits.
[ Hits: 133 | Votes: 1 | Rating: 10 ]

Amateur Service Spectrum Requirements at 7 MHz - An information paper by the International Amateur Radio Union. The amateur service seeks the return to an exclusive, worldwide allocation of no less than 300 kHz in the vicinity of 7 MHz.
[ Hits: 94 | Votes: 5 | Rating: 10 ]

40 MHz 8m Band Amateur Radio Exploration - The 8m ISM band, a unique frequency range between 10m and 6m, holds potential for amateur radio enthusiasts, yet it remains largely unallocated. This spectrum offers fertile ground for research and self-training. The author's experience with low-power transmissions and WSPR testing highlights the band's capabilities and the need for a narrow, speech-free amateur allocation to encourage experimentation. Discover the world of 8m ISM radio exploration and its future possibilities.
[ Hits: 76 | Votes: 1 | Rating: 8 ]

Exploring the Spectrum From HF to UHF Frequencies - During radio's early days, high frequencies were under 30 MHz due to technical limitations. As understanding grew, components improved, allowing for higher frequencies like VHF and UHF up to 3 GHz. The HF band's long wavelengths provide unique propagation challenges influenced by solar activity. VHF and UHF bands face diffraction and reflection issues but offer diverse applications, from amateur radio to 5G and GPS technologies.
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Spectrogram - Spectrogram, a PC-based audio frequency spectrum analyzer available from Visualization Software, aids ham radio enthusiasts in aligning receivers like Elecraft K2. Versions are downloadable, with an intuitive interface and customizable parameters. Tutorials by experts like Tom Hammond and John Grebenkemper offer additional guidance.
[ Hits: 23 | Votes: 0 | Rating: 0 ]
RSP Spectrum Analyser ^new - The analyser has been written to support the full range of SDRplay SDR radios including the new RSP1B. The analyser is capable of resolution bandwidths of less than 1Hz with sensitivity better than -145dBm. In addition to being able to run five separate traces, the analyser offers the ability to capture screen shots, export data in a range of formats and includes a versatile marker system. The analyser includes a comprehensive user manual and offers a very useful addition to any workbench.
[ Hits: 33 | Votes: 1 | Rating: 10 ]

The definitive guide to RF Power measurement - RF Power measurement using a DVM, RF Power measurement using an RF detector, RF Power measurement using an Oscilloscope and using a Spectrum Analyzer
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A Simple Spectrum Analyser - An home made simple spectrum analyzer project includes pictures and diagram.
[ Hits: 218 | Votes: 1 | Rating: 10 ]
Spectrum Analyser I1KFH - A home mande spectrum analyzer project with several pictures and disposition of components boards based on a project by S57C
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Specan Spectrum analyzer - The Specan is actually a very simple but robustly built receiver. it is, in essence, a double conversion superhet receiver with 112 Mhz and 12 Mhz Intermediate frequencies. The first mixer uses an Si570 as the local oscillator. The Ardiuno that controls the Specan is a very flexible microcontroller board that you can program in simple C language
[ Hits: 86 | Votes: 1 | Rating: 9 ]
A Simple Spectrum Analyzer - This is a swept-filter spectrum analyzer. Basically, RF and swept oscillator signals are fed to a mixer and the output of the mixer is passed through a highly selective crystal filter.
[ Hits: 121 | Votes: 0 | Rating: 0 ]

OsclilloSpectrum - Spectrum and oscillo with tuner TV 40 MHz to 860 MHzh ome made project. This projects foreseen a multi function device providing a spectrum analyzer, scope and a voltmeter.
[ Hits: 117 | Votes: 1 | Rating: 7 ]