modulation

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modulation

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Operating Modes : Digital Modes
  • 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: 132 | Votes: 1 | Rating: 10 ]
Operating Modes : Repeaters
  • Ham Radio: Using Repeaters - The most basic form of repeater receives communication on one frequency and re-transmits at a different frequency. This is known as duplex communication. Repeaters are generally set up to operate with FM modulation on the amateur bands within the VHF (30 MHZ – 300 MHZ) and UHF frequencies (300 MHZ – 3 GHz). These are generally the frequencies used by handheld and mobile devices.
    [ Hits: 92 | Votes: 1 | Rating: 8 ]
Radio Equipment : VHF-UHF Handhelds : Baofeng UV-5R
  • Fix Baofeng UV5R+ Dead Audio - Fix the no-mic problem with the Baofeng UV5R+. It may happen the carrier wave is there, but there is no modulation.
    [ Hits: 28 | Votes: 0 | Rating: 0 ]
Software : Signal Generator
  • 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 ]
Software : Software Defined Radio
  • sodiraSDR - Software Radio - Software Defined Radio (SDR) for analog and digital modulation modes, can demodulate AM envelope, AM synchronous, AM stereo, LSB, USB, FM, FM Broadcast, DRM30, DRM+
    [ Hits: 357 | Votes: 4 | Rating: 8.75 ]
Software : Weak Signal
  • VARA - VARA HF is a soundcard modem that can be found on the HF bands exchanging traffic (Winlink). VARA implements an High Speed Data Mode and comes in 2 separate programs VARA FM and VARA HF. VARA is a High Performance HF modem based on OFDM modulation. VARA Modem, brings state of the art Military grade technology to new and existing HF data. Introduces a new standard of technology available for Amateur and Commercial use. Designed for operation within a SSB Bandwidth of 2400 Hz.
    [ Hits: 103 | Votes: 1 | Rating: 10 ]
Technical Reference : Arduino
  • Arduino QRP Transceiver: DIY Success on HF Bands - This article introduces an Arduino-based QRP CW Transceiver designed for lower HF bands. The journey begins with the Wotduino, evolving from a keyer to a multi-mode beacon. The development includes a QRP transmitter and culminates in a receiver inspired by Roy Lewallen design. The transceiver, controlled through a control bus features a signal path, modulation, filtering, and adjustable frequency settings. Despite initial testing intentions, successful QSOs on 80 and 40 meters showcase its functional capabilities.
    [ Hits: 104 | Votes: 1 | Rating: 1 ]
Technical Reference : Audio
  • 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 ]
Technical Reference : RF Design
  • Demonstrating AM sidebands - Amateur radio courses teach that in amplitude modulation, sidebands arise. This can be proven mathematically, and nowadays with an SDR one can easily see them.
    [ Hits: 64 | Votes: 0 | Rating: 0 ]
Technical Reference : Transverters
  • 2m to 70cm Transverter Circuit - A 70cm / 432 MHz Transverter Project transverter circuit is an electronic device that converts a radio signal from the 2 meter to the 70 centimeter band and vice versa, allowing a single transmitter/receiver to be used for both bands. It consists of an IF stage, local oscillator, frequency multiplier, and amplifier. The circuit must be designed for minimal signal loss, noise and intermodulation distortion.
    [ Hits: 77 | Votes: 0 | Rating: 0 ]

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