q signals

q signals

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• 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: 347 | Votes: 1 | Rating: 2 ]

• HF SIGNALS - Makers of QRP HF General Coverage Transceivers you can build. The Home of BITX transceivers, uBITX General Coverage Receiver-Transmitter. A general coverage, 10 watts HF SSB/CW transceiver kit with features you NEED for operating ease, convenience and versatility. It works from 3 MHz to 30 MHz, with up to 10 watts on SSB and CW, with a very sensitive receiver.
  [ Hits: 483 | Votes: 6 | Rating: 9.5 ]

• 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: 630 | Votes: 0 | Rating: 0 ]

• Longwave Information - DK8KW Longwave Information Slow-Voice, Transmitting compressed analog Audio Signals on LF
  [ Hits: 238 | Votes: 0 | Rating: 0 ]

• A method to listen to QRSS signals - An unique method to listen to QRSS signals is... using an old tape recorder with variable speed
  [ Hits: 238 | Votes: 0 | Rating: 0 ]

• Double Cross Satellite Antenna - An easy to build antenna for ground reception of NOAA weather or amateur satellite signals. Double cross antenna by Gerald Martes
  [ Hits: 3077 | Votes: 15 | Rating: 4.74 ]

• 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: 670 | Votes: 2 | Rating: 10 ]

• Robot36 SSTV Decoder for Android - Receive and decode SSTV amateur radio SSTV signals with this small and powerfull SSTV decoder app for Android devices. Requires access to microphone.
  [ Hits: 261 | Votes: 1 | Rating: 10 ]

• ScopeDSP - ScopeDSP analyzes sampled-data signals in the time and frequency domains. It can generate, read, write, window, and plot real and complex digital data signals.
  [ Hits: 839 | Votes: 1 | Rating: 1 ]

• JMSK - 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: 372 | Votes: 2 | Rating: 5.5 ]

• WSJT-X - WSJT-X implements communication protocols or modes called FT8, FT4, JT4, JT9, JT65, QRA64, ISCAT, MSK144, and WSPR, as well as one called Echo for detecting and measuring your own radio signals reflected from the Moon. These modes were all designed for making reliable, confirmed QSOs under extreme weak-signal conditions. WSJT-X works on Windows Linux and MacOS. This is the official WSJT-X distribuition site.
  [ Hits: 13100 | Votes: 70 | Rating: 7.25 ]

• Sonograph Spektrum Analyzer - Sonogram is a highly flexible audio spectrum analyzer for the analysis of sound, music and speech signals in the frequency-domain using different algorithms.
  [ Hits: 695 | Votes: 0 | Rating: 0 ]
• PSELab freeware - PSELab is a freeware Windows application useful to estimate power spectrum and short-time spectral distribution of signals. The application uses periodogram, least squares Prony, Burg, covariance, MUSIC and some other methods. To estimate short-time spectral distribution, the application uses short Time Fourier transform, pseudo-Wigner-Ville transform, least squares Prony, Burg, covariance, MUSIC and some other methods.
  [ Hits: 900 | Votes: 3 | Rating: 10 ]

• 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: 787 | Votes: 1 | Rating: 1 ]

• Ham Radio Beat Frequency Oscillator - A simple free running oscillator oscillating at the receiver\'s IF (intermediate frequency) beats with the incoming signals in either CW or SSB and the resultant audio frequency goes to the AF amplifier.
  [ Hits: 718 | Votes: 0 | Rating: 0 ]

• About Key Clicks - The Necessary Bandwidth for CW Signals By George Grammer W1DF
  [ Hits: 193 | Votes: 0 | Rating: 0 ]

• Frequency Multipliers - An exaustive document on frequency multipliers with a particular attention on ways to generate high frequency signals for microwave
  [ Hits: 385 | Votes: 0 | Rating: 0 ]
• 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: 282 | Votes: 1 | Rating: 6 ]

• 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: 380 | Votes: 0 | Rating: 0 ]

• 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: 207 | Votes: 0 | Rating: 0 ]

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