Digital Voice FAQ

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

Accessing the System

You can access the Southern Indiana Network (SIN) using a digital hotspot. You will need to use the setting found at the bottom of our Digital Repeater page. Once that is set up you can use your digital radio to talk to your hotspot and your hotspot will link you to the SIN system.

Tag: access

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No you can’t. All of the digital voice repeaters are digital all the time. You’ll be able to hear the digital signals when the repeaters are active but your radio will not be able to decode them.

You can access one of the FM repeaters in the W9WIN system. Those repeaters are listed on this site as well. The W9WIN system is a great place to learn about digital modes and our digital repeaters.

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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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Troubleshooting

The repeater is transmitting in a mode your radio can not decode. Your radio will still receive the signal but because it isn’t decoding it your radio is set to not open up the speaker.

Category: Troubleshooting

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You are hearing digital data being transmitted by the repeater. Some of it may sound like traditional packet and some more like static. Exactly what you hear depends on the mode (DMR, P25, NXDN, etc.) the repeater is transmitting in. You need a radio that uses one of the digital modes supported by the repeater to monitor and talk on the repeater.

Category: Troubleshooting

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Our repeaters are capable of operating in several different digital voice modes. When you hear voice the repeater is operating in the mode your radio uses. When you hear digital noise or what sounds like static the repeater is operating in a different digital mode than your radio is capable of decoding. You should be able to adjust your settings so you will not hear the other digital modes.

Category: Troubleshooting

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