Hi John, Not quite sure what you are thinking, but here is a brief overview of the DStar data stream. The input to / output from the data processing 'module' of the radio is a 9600 Baud stream - which equates to roughly 960 eight bit characters per second. The logic of the system digitizes the voice in and passes it to the AMBE Vocoder that compresses the data stream - a lot. It is the compresion by the Vocoder that is both the strength and weakness of DStar. The compression makes a low data rate (and thus low bandwidth) possible, but it also means that the re-constituted voice is an approximation of the voice input. Generally the reconstructed voice is pretty good, and given the bandwidth it is really quite remarkable. In any case, the baud rate of the system is fixed and cannot be modified at any stage of the process without making the resulting stream unrecognizable to other DStar systems. Note that the data rate over the internet can be much higher, but the chain from repeater controller to / from the radio is fixed for DV comms at 9600.
73 Ted W1GRI _____ From: dstar_digital@yahoogroups.com [mailto:dstar_digi...@yahoogroups.com] On Behalf Of n2gyn Sent: Tuesday, August 31, 2010 16:54 To: dstar_digital@yahoogroups.com Subject: [DSTAR_DIGITAL] Bit Rate? Most radios are sent to 8bit. Can all radio's bit rate be changed? I believe it is the LOW bit rate that lowers the quality of d-star's audio. Is there a sub menu in the radio's. Also can the repeater's rate be change to a higher rate? John
