Hello, Yesterday I commited support for same-mode Codec2 repeater (digital to digital). Apart from voice frames, now station identifiers and text messages also get digipeated. For now the Codec2 audio gets decoded if forwarded over the VoIP connection and re-encoded at the other end for RF transmission. I intend to change that in the future and send direct Codec2 frames over the wire to avoid loss of quality. The roadmap has mixed-mode repeating (analog to digital) and multi-channel repeater using either FDMA or TDMA, with user control over VoIP channels similar to DMR talkgroups.
Would be curious to know what people think of the alternative between these two access modes. Here's what I came up with: TDMA cons: - hardware needs to support burst timestamping - fast tx/rx cycle limits amplifier choice drastically OFDMA cons: - high PAPR leads to net reduction of transmitted power and more complex equalization - frequency correction and Doppler are an issue FDMA pros: - can do mixed mode repeating Best regards, Adrian ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
