i and q signals71 links
Antennas : Theory
- Antenna Basics : Directional Antennas
- An article describing basic concepts of antenna radiation, and in particular directional antennas like Yagi antennas or Quad antennas and how they determine the direction or signals.
[ Hits: 144 | Votes: 0 | Rating: 0.00 ]
- Guide to JT65A
- The complete Bozo's guide to JT65A by K3UK, learn how to install and operate WSJT software and start making QSO in weak signals operating modes
[ Hits: 455 | Votes: 0 | Rating: 0.00 ]
- JT65A - weak-signal digital mode
- A very exaustive and complete article on JT65A and JT65-HF operating mode, including software download links, installation notes, how to make JT65A QSO and videos to correctly work with weak signals by NW7US
[ Hits: 455 | Votes: 2 | Rating: 10.00 ]
- JMSK is a software modem that implements a good coherent MSK demodulator that has performance comparable to BPSK. Signals are demodulated from the soundcard. Modulated signals can be routed through the soundcard or to an external device such as a DDS module for direct RF modulation. The advantage of MSK compared to PSK is that non linear amplifiers can be used and has a faster roll off. It is an open source cross-platform program written in C++ Qt.
[ Hits: 135 | Votes: 1 | Rating: 1.00 ]
- Signal Scope
- SignalScope SignalScope is a modularized, multi-channel dynamic signal analyzer and data acquisition platform for Mac. It
[ Hits: 274 | Votes: 0 | Rating: 0.00 ]
- WSJT-X if a software that offers specific digital protocols optimized for EME, meteor scatter, and ionospheric scatter, at VHF/UHF, as well as for LF, MF, and HF propagation. The program can decode fraction-of-a-second signals reflected from ionized meteor trails and steady signals more than 10 dB below the audible threshold. Popular modes includes FT8, JT4, JT9, JT65, QRA64, ISCAT, MSK144, and WSPR
[ Hits: 379 | Votes: 3 | Rating: 4.00 ]
- Use Band Pass Filters to clean up Signals
- Clean Up Your Signals with Band-Pass Filters, a two-parts article published in this PDF file from a June 1998 QST article
[ Hits: 447 | Votes: 0 | Rating: 0.00 ]
- About Key Clicks
- The Necessary Bandwidth for CW Signals By George Grammer W1DF
[ Hits: 103 | Votes: 0 | Rating: 0.00 ]
- Introduction to RF & Wireless Communications Systems
- This tutorial covers an introduction to RF, wireless, and high-frequency signals and systems, includes explaination of what is RF, why operate at Higher Frequencies, Frequency Shifting through Frequency Mixing.
[ Hits: 112 | Votes: 0 | Rating: 0.00 ]
- The Raspberry OscilloPhone
- Use your Smartphone as an Oscilloscope to visialize signals from 150 Hz to 15kHz and as a Signal Generator to generate sinusoidal, square and triangular signals up to 15kHz
[ Hits: 229 | Votes: 0 | Rating: 0.00 ]
- Cross Band Repeaters
- Crossband Repeating is a process where a Ham transmits one signal on one band (typically UHF), and it is received by another radio with a better antenna/power installation, and re-transmitted (typically on VHF) to another radio system, or a repeater. Everyday examples of cross-band repeaters are repeater receive sites that hear the input signals on 2m and retransmit those signals on a frequency higher than 220 MHz.
[ Hits: 62 | Votes: 0 | Rating: 0.00 ]
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