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Operating Modes : VHF UHF
  • 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: 72 | Votes: 1 | Rating: 8 ]
Radio Equipment : HF Transceivers : Icom IC-703
  • Icom IC703 10W Transceiver - The IC703 features a built-in DSP filter and auto ATU as well as speech processing an a CW keyer with 3 message memories. It is an ideal all-in-one ham station for QRPers.
    [ Hits: 404 | Votes: 3 | Rating: 10 ]
Radio Equipment : HF Transceivers : Kenwood TS-590S
  • TS-590 Low power in SSB - Some users report relatively low power output in SSB from Kenwood TS-590S
    [ Hits: 1947 | Votes: 10 | Rating: 6.4 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • Speech synthesiser for FT-817 - This construction project is for anyone wanting to give this popular little radio a voice of its own. This Speech synthesiser reads out the current frequency, mode and menu settings whenever they are changed via the front-panel controls
    [ Hits: 124 | Votes: 0 | Rating: 0 ]
  • FT-817 Audio Speech Compressor: Boosting Signal Power with SSM2165 - Designed for the FT-817, this audio speech compressor, centered on the Analog Devices SSM2165, offers a 40 dB compression range, enhancing signal power. Built externally with the SMD version to preserve warranty, the circuit interfaces smoothly with electret microphones. Testing shows a 6 dB average power increase. Adaptable to rigs with electret microphones, it maintains unity gain and 40 dB compression.
    [ Hits: 59 | Votes: 0 | Rating: 0 ]
Software : Decoders
  • Digital Speech Decoder - An open source software decode various xMBE based modes. It support decoding QPSK, C4FM modes such as P25 Phase 2 (TDMA), MotoTRBO, NexEDGE, ProVoice and others more.
    [ Hits: 4297 | Votes: 48 | Rating: 5.44 ]
  • Digital Speech Decoder - MUlti mode digital signal decoder software capable or C4FM D-Star decoding, a guide to compile and install DSD
    [ Hits: 1038 | Votes: 2 | Rating: 5 ]
Software : Digital Voice
  • Codec 2 - Codec2 is an open source low bit rate speech codec designed for communications quality speech at 2400 bit/s and below. Applications include low bandwidth HF/VHF digital radio and VOIP trunking.
    [ Hits: 817 | Votes: 7 | Rating: 7.43 ]
Software : Signal Generator
  • 16 DTMF Tone Generator Keypad App - This app will give you a 16 tone DTMF keypad and the ability to generate custom DTMF sequences, and set the duration and tone to silence ratio. Includes the characters 1234567890*# and the menu tones ABCD. You may enter a custom sequence via the keypad, soft keyboard, or speech if your device already has speech-to-text capability. This is basically a touch tone telephone keypad, which may be of interest to amateur ham radio repeater operators
    [ Hits: 726 | Votes: 4 | Rating: 7.75 ]
Software : Spectrum analyzers
  • 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: 693 | Votes: 0 | Rating: 0 ]
Technical Reference : Audio
  • Improving transmission Intellegibility - Improving the intelligibility of an SSB transmissions What is important when processing speech. Which bands have more impact on speach ?
    [ Hits: 552 | Votes: 1 | Rating: 6 ]
Technical Reference : HF Radios
  • The G4AON SSB Transmitter - This transmitter covers the 160, 80, 40 and 20 metre bands and provides both SSB and properly generated CW. The CW side of this transmitter is not compromised and produces excellent CW. On SSB the audio has been tailored to provide a rising response to 3 KHz, with a sharp drop above that frequency. There is RF speech clipping to both provide more "punch" and to limit the peak output.
    [ Hits: 180 | Votes: 2 | Rating: 9.5 ]
Technical Reference : Microphones
  • Speech Processor - How to improve performance of your audio using a home made speech processor. In this article the author describes how to make your own speech processor providing a PCB foil pattern and with a 60mm x 60mm board.
    [ Hits: 241 | Votes: 2 | Rating: 10 ]
Technical Reference : QRP Projects
  • mcHF QRP transceiver - Small and inexpensive homebrew HF radio 5W Output, CW SSB AM FM, DSP, Speech Processor, Sprectrum Scope, Watefall Display. mcHF is a small, home-brewed amateur radio project. Firmware is released as open source.
    [ Hits: 1486 | Votes: 6 | Rating: 5 ]

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