Universal Digital Voice

Bob/K0NR operates VHF/UHF FM from Pikes Peak for the June VHF contest.

For the June VHF contest, I operated Single-Op Portable from the summit of Pikes Peak. I combined this with Summits On The Air (SOTA) and Parks On The Air (POTA) activations. In a few hours, I made 80 QSOs on 6m, 2m, 1.25m, 70cm, and 23cm bands. It was a fun time.

Quite a few of the contacts were made on 2m FM, The Utility Mode. Even though CW, SSB and WSJT modes are more efficient (especially with weak signals), FM is still the least common denominator for modulation. Everyone has it, so there are more QSOs available with that mode.FM is the default choice for easy VHF simplex communication.

Where Be Digital?

Perhaps it was the lack of oxygen in my brain, but I started to wonder:

Why the heck, in the year 2022 are we still using an analog mode for so much of our amateur communication?

FM was invented in the 1930s, which is ancient history from a technological point of view. Of course, we do have many handheld and mobile radios available that support digital voice (DV) modulation. In fact, we probably have too many digital formats to choose from, all incompatible, which has fragmented the market. The three dominant digital voice modes are D-STAR (first out of the chute), DMR (a commercial standard) and Fusion (Yaesu’s C4FM offering). I think these all have their advantages and disadvantages which attract various people to support one or more of them. However, none of them is dominant and universal, like FM. It is interesting that virtually all DV radios on VHF/UHF include analog FM because it is The Utility Mode, the fallback modulation that keeps us all compatible.

Universal Digital Voice

For this post, I am primarily looking at this from a SOTA and POTA perspective, which means simplex operation and not repeaters. (However, you could extend this idea to repeaters, too.) I am also not so concerned about keyboard modes, just DV plus some basic digital telemetry that goes with it. It can’t be too complex or it will not be fast and easy to use.

I propose a universal DV mode that is implemented in all VHF/UHF transceivers (think in terms of your typical handheld or mobile transceiver for 2m and 70cm). And yes, go ahead and also implement D-STAR, DMR, Fusion, or whatever, but give us a universal digital format that just works. The key idea is to have a digital least common denominator mode that replaces FM. This mode can be the defacto standard for “meet me on simplex” and become the Next Generation Utility Mode. How cool would it be to get on top of a summit and push the DV Call button and work stations on digital many miles away? The station’s callsign should be embedded in the digital stream along with location data (lat/lon or grid locator) and some user-defined fields ( SOTA reference or other information). This format should also have really good weak-signal performance, significantly better than FM, for when the signal-to-noise ratio is low. All the technology must be open, to encourage wide adoption, with no proprietary codecs or modulation schemes.

The technology for this already exists and it would not be difficult to implement. The real challenge is the lack of industry coordination and collaboration between amateur radio manufacturers. Unfortunately, I don’t see this changing any time soon.

That’s my thought for today. What do you think?

73 Bob K0NR

The post Universal Digital Voice appeared first on The KØNR Radio Site.

Bob Witte, KØNR, is a regular contributor to AmateurRadio.com and writes from Colorado, USA. Contact him at [email protected].

5 Responses to “Universal Digital Voice”

  • Goody K3NG:

    Not to be “that guy”, but I put the blame for our fragmented digital voice landscape squarely on ARRL. They should have taken a technical leadership role years ago and worked with equipment manufacturers to come up with one open standard. It’s too late now. The manufacturers have too much cost, effort, and marketing sunk into each of their incompatible systems.

  • Mark K5MGK:

    I have downloaded and started playing with FreeDV on HF recently. I think there are a couple more open source projects for HF. I am not sure what’s out there for VHF/UHF. The problem with FreeDV and the others are that you need to have your computer modulate the signals. It would be nice to have some major manufacturers take up one of the open source codecs and implement them into their product line. Funny, but if Baofeng had done this, it would already be the most popular mode on HTs. 73 de K5MGK

  • Don NX1Q:

    Great thoughts. I’m sure lots of us have thought like this many times. I know I have. But, in the second half, sounds like you’re describing C4FM to me!

  • Alfred0 ,IT9SWH:

    Sono attivo in DV,multiprotocollo Sicilia. TG2249

  • Bill W2TJF:

    Good article!
    If Fusion were to become open source I don’t think that would hurt Yaesu but it could become the standard.

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