D-STAR is actually an open standard.<p>The only part that&#x27;s closed is the voice codec (AMBE). But if you just want to transmit or decode data packets, you can definitely build your own hardware. There&#x27;s even a couple SDR modules for it:<p><a href="http:&#x2F;&#x2F;www.flexradio.com&#x2F;amateur-products&#x2F;flex-6000-signature-series&#x2F;waveforms&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.flexradio.com&#x2F;amateur-products&#x2F;flex-6000-signatur...</a><p><a href="http:&#x2F;&#x2F;www.rtl-sdr.com&#x2F;listening-d-star-digital-voice-dsd-1-7&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.rtl-sdr.com&#x2F;listening-d-star-digital-voice-dsd-1-...</a>