i and q signals
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Antennas : Quadrifilar Helix- QFH antenna for NOAA Satellites
- NOAA Satellite Signals With a PVC QFH Antenna and Laptop, this website also link to a github where you can find files and supporting documentation for constructing a QFH Antenna
[ Hits: 411 | Votes: 6 | Rating: 6.5 ]
- Making a Quadri Filar Helix antenna
- Lot of pictures, drawings and schematics to build your own QFH Quadri Filar Helix antenna for 137 MHz satellite signals reception
[ Hits: 451 | Votes: 6 | Rating: 3.83 ]
- Data Sound Samples
- This page contains links to a variety of data signals that have been specially recorded. Each file contains a standard test message (the quick brown fox jumped over the lazy dog) repeated twice. The files can help you learn the characteristic sound of various data modes but they can also be used to make sure your decoder is working.
[ Hits: 247 | Votes: 0 | Rating: 0 ]
- Digital Mode General Operating Tips
- Start by getting your audio levels sorted out, Having your levels correct is critical to maximum effectiveness in both TX quality and also for being able to decode signals properly. Guide to
Filters and other Rig Settings to optimize your output signal
[ Hits: 183 | Votes: 1 | Rating: 9 ]
- Using PSK Reporter as Propagation Tool
- PSK Reporter,is a powerful tool for monitoring your FT8, JT65 or PSK signals around the world. But, even if you are not transmitting on any of these modes it can still be a great propagation tool for determining which bands are open and to where in the world signals from your area are being heard.
[ Hits: 185 | Votes: 1 | Rating: 8 ]
- DXPSK
- DXPSK and SMARTPSK are freeware Windows PSK31 software tools capable to send and recive even multiple tracks of PSK31 signals. SMARTPSK is the improved version of DXPSK capable to display up to 25 tracks.
[ Hits: 142 | Votes: 1 | Rating: 10 ]
- AppCAD
- Free windows application for RF Microwave and Wireless applications. AppCAD is useful for the design and analysis of many circuits, signals, and systems using products from discrete transistors and diodes to Silicon and GaAs integrated circuits. AppCad is a unique suite of RF design tools and computerized Application Notes to make your wireless design job faster and easier
[ Hits: 128 | Votes: 1 | Rating: 8 ]
- AF signal function generator for Windows
- Windows signal function generator sotfware, offers 4 main channels, 4 modulators, 1 measurement generator, 1 frequency standard generator, Amplitude, phase and frequency modulation, can generates real band-limited signals
[ Hits: 612 | Votes: 4 | Rating: 3 ]
- WSQCall A Weak Signal QSO mode for LF/MF
- Amateur Radio enthusiasts who are interested in the LF and MF bands may be familiar with WSPR and WSJT JT9. Used as a propagation probe or beacon, WSPR allows very weak signals to be detected, frequently as weak as -27dB SNR.
[ Hits: 186 | Votes: 0 | Rating: 0 ]
- AI-Powered Radio Signal Cleanup: Battling QRM in Real Time
- Amateur radio enthusiast Jean-Paul Suijs discusses combating manmade noise (QRM) in radio signals using AI. Detailing experiments with phase-shifting techniques and the self-learning nature of AI, he explores AI-based audio processing apps for real-time noise cancellation during radio contests, demonstrating results on both medium wave and shortwave bands.
[ Hits: 67 | Votes: 0 | Rating: 0 ]
- Analyzing SSB Signal Quality in CQ WW Contest
- This article investigates SSB signal quality during the CQ WW 2015 SSB contest. It highlights the importance of adhering to the ideal SSB signal profile, the impacts of intermodulation distortion, and the consequences of poor-quality signals. The analysis underscores the need for well-tuned equipment to ensure cleaner, more efficient signals and, consequently, a more enjoyable and spacious experience for contest participants and amateur radio operators.
[ Hits: 39 | Votes: 0 | Rating: 0 ]
- A 2 meter band-pass cavity using surplus Heliax
- Cavity is often required at a busy site to not only prevent its receiver from being overloaded by off-frequency signals, but also be a good neighbour and prevent low-level signals from your transmitter from getting into other users receivers - not to mention the preventing of those other signal from getting back into your transmitter to generate spurious signals in its own right.
[ Hits: 126 | Votes: 2 | Rating: 3 ]
- Guide to decode SSTV with RaspberryPi and RTL-SDR
- A tutorial on how to setup a receiver capable to decode SSTV signals with a small RaspberryPi version 2 and a RTL-SDR dongle. The author explains how to install the needed software to interface the RTL-SDR and a step by step guide to install the QSSTV software used to decode the signals.
[ Hits: 329 | Votes: 1 | Rating: 1 ]
- Antuino - Antenna Test Equipment
- Antuino is an accurate instrument that can be used in the field to measure SWR, field strength, modulation, etc. In the lab, it can be used to sweep filters, measure gain, distortion, frequency response, etc. It works upto 150 Mhz. On the third harmonic, it is usable on 435 Mhz band as well (with reduced sensitivity).
[ Hits: 304 | Votes: 0 | Rating: 0 ]
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