Digital Voice FAQ

We’ve tried to assemble some of the most frequently asked questions for you to review.

Modes

  • APCO P25 [ or simply just P25] – Found in repurposed public safety equipment from multiple vendors. Uses IMBE or AMBE CODEC over C4FM.
  • D-STAR – Open specification with proprietary vocoder system available from Icom, Kenwood, and FlexRadio Systems. Uses AMBE over GMSK with VoIP capabilities.
  • DMR – Found in both commercial and public safety equipment from multiple vendors. Uses AMBE codec over a C4FM modulation variant with TDMA.
  • System Fusion – Open specification with proprietary vocoder system available from Yaesu. Uses AMBE CODEC with C4FM modulation.
  • NXDN Used by Kenwood (Nexedge) and Icom (IDAS)

Credit goes to Wikipedia.

Category: Modes

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In the past you would have wanted to get the digital mode being used in your local area but with the advent of MMDVM multi-mode repeaters that has all changed. If you want to access any of our repeaters you can pick any of the modes we currently support (NXDN, DMR, P25, D-Star, Fusion). You don’t have to stick with a single mode ether! I have a surplus NXDN mobile I found on eBay and a cheap Chinese DMR handheld. Both work great on my hotspot or any of our repeaters.

In the end, if you like Icom then D-Star might be a great option for you. Like Yaseu? Get a Fusion radio. Have access to public safety surplus? Icom NXDN radios work fine!

Category: Modes

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The answer to this question used to be no but that’s changing. Now the answer is, it depends.

If you are talking through one of our repeaters to a person on a different repeater on our system then yes, absolutely. Because we use the MMDVM controllers (and some extra special magic smoke) on our repeaters this isn’t a problem. You’ll regularly hear a mix of radios modes being used across the system.

If you want to talk to someone that is on the same repeater you are using then the modes need to be the same. Also, if you want talk radio to radio in a digital mode you’ll need to use the same mode (but don’t forget you can still use FM to talk radio to radio if you’ve programmed FM channels into your radio).

Category: Modes

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