Re: Yaesu Digital support / Codec2 support
"John D. Hays" <john@...>
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NW Digital Radio doesn't have any current project plans to implement either Fusion or Codec-2 on the UDRX-440.
That being said, here are some thoughts for someone who would like to support them.
Yaesu has prepared a document which describes the protocol in detail here. The DV3000 card we have developed should be able to encode and decode the Fusion AMBE stream, both half rate and full rate, and one would need to implement the protocol stack. Also a C4FM modem would need to be written for the UDRX (preferably in fixed point math). We would be willing to give integration guidance to a developer wishing to implement the modem using our I/Q interface so that it has a socket interface like our GMSK, MSK, and other modems. (This would allow re-use for other protocol stacks, for example the D-STAR spec is not limited to GMSK or it might be used for Codec-2.)
A DV3000 card and Raspberry Pi would allow someone to start work on the protocol stack ahead of the creation of the modem and release of the UDRX.
We have been following Codec-2 development and there are a couple of ways to implement it. Currently, Codec-2 has not defined a VHF/UHF repeater and networking protocol or modulation, the work has been primarily focused on HF to this point. The digital stream for the vocoder and protocol stack could be run in 3 different ways:
On Sat, Apr 19, 2014 at 6:33 PM, Vaughn Phillips <vaughn.w0ulf@...> wrote: