On 11/11/13 6:44 PM, Gordon JC Pearce wrote:
On Mon, Nov 11, 2013 at 12:14:26AM -0600, George Henry wrote:
There are very good reasons why no other amateur radio manufacturer will touch it. George, KA3HSW
What, apart from encryption being illegal on the amateur bands?
Without a radical redesign and a new codec, DStar is just not suitable for amateur use. Proprietary software runs counter to the whole principle of amateur radio, and in this case the encrypted proprietary codec is quite possibly not legal for amateur use.
That argument is a furphy. AMBE is readily available in a $20 chip if the authorities want to listen in, it's not encrytion (formally defined as encoding to obscure the meaning of a transmission), it's encoding to minimise the audio data transmitted for intelligible speech.
D-STAR itself is open specification, and a significant proportion (a majority now?) of D-STAR gateways run open source software (such as the G4KLX pcrepeatercontroller/ircddbgateway software) on both Icom repeater hardware and homebrew setups.
Sure, an open source vocoder would have been nice, but one with suitable performance and available in a form that could be incorporated into radios didn't exist when D-STAR was developed. Had D-STAR been developed today, Codec2 would be a real option (though I'm not yet aware of an implementation suitable for a mobile or HT).