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Discussion in 'General Ham Radio Discussion' started by 5B4AIT, Jan 21, 2011.

  1. 5B4AIT

    5B4AIT Member

    Jan 21, 2011
    Likes Received:
    Hello I am Kelly, 5B4AIT from Cyprus.

    I have developed a new system for having QSOs on Internet.

    Instead of using plain VOIP transmission I have implemented an SDR (Software Defined Radio) concept.

    HamSphere is software Tranceiver that works in Windows, Linux or Mac or any other Java driven system. It communicates over a simulated Ionosphere called "HamSphere". It covers 6m to 160m bands.

    HamSphere uses real radio principles with local oscillators, balanced mixers, filters etc. The modulation is true Double Sideband Modulation with carrier suppression hence the "donald duck" sound when you swirl the knob. The receiver is a direct LO-mixer detector where we just add the carrier (Beat oscillator) to detect the audio. Filters are made from 17-pole FIR filters producing effective 3.8, 2.8 and 0.7 kHz filters.

    The unique feature of HamSphere is that the user can maintain connections under natural realistic conditions. Signals may vary and interference is present giving the user the impression that he or she is using a real shortwave transceiver.

    Take a look and try it out:
    HamSphere - Ham Radio Software Transceiver

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