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IT NewsOpen Source DMR Radio - While ham radio operators have been embracing digital mobile radio (DMR), the equi... - <a href="https://hackaday.com/2025/04/19/open-source-dmr-radio/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://hackaday.com/2025/04/19/open-source-dmr-radio/</a> <a href="https://schleuss.online/tags/radiohacks" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#radiohacks</a> <a href="https://schleuss.online/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://schleuss.online/tags/codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#codec2</a> <a href="https://schleuss.online/tags/dmr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#dmr</a>

Kevin Karhan :verified:<a href="https://hessen.social/@ustralien" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@ustralien</a> and even then:Modern <a href="https://infosec.space/tags/Codecs" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codecs</a> like <a href="https://infosec.space/tags/Speex" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Speex</a> and espechally <a href="https://infosec.space/tags/Opus" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Opus</a> really work great on <a href="https://infosec.space/tags/Mumble" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Mumble</a> and other solutions like <a href="https://infosec.space/tags/WebCall" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#WebCall</a> and <a href="https://infosec.space/tags/SIP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SIP</a>-Clients like <a href="https://infosec.space/tags/Linphone" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Linphone</a>.<ul><li>Unless you're stuck on <a href="https://infosec.space/tags/Iridium" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Iridium</a>, then <a href="https://infosec.space/tags/Codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codec2</a> is the only thing narrowband-efficient enough to work at all...</li></ul>

Kevin Karhan :verified:<a href="https://mastodon.online/@herrorange" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@herrorange</a> Already existing options do that better than the old <a href="https://infosec.space/tags/SILK" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SILK</a> codec.<ul><li><a href="https://infosec.space/tags/Linphone" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Linphone</a> (<a href="https://infosec.space/tags/SIP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SIP</a> client) supports <a href="https://infosec.space/tags/Opus" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Opus</a> & <a href="https://infosec.space/tags/Speex" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Speex</a>, which can do better at narrower bandwiths)</li><li><a href="https://infosec.space/tags/Codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codec2</a> OFC can work even on <a href="https://infosec.space/tags/Iridium" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Iridium</a>-level bandwiths</li><li><a href="https://infosec.space/tags/Mumble" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Mumble</a>, <a href="https://infosec.space/tags/WebCall" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#WebCall</a> & <a href="https://infosec.space/tags/JitsiMeet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#JitsiMeet</a> also do fine on <a href="https://infosec.space/tags/Skype" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Skype</a>-able bandwiths and don't require a T H I C C install on peoples' devices...</li></ul>

Kevin Karhan :verified:I mean, I don't expect a <a href="https://infosec.space/tags/Tablet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Tablet</a> to have good <a href="https://infosec.space/tags/Audio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Audio</a> quality.<ul><li>Frankly I'd be content with <a href="https://infosec.space/tags/Codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codec2</a>-level <a href="https://infosec.space/tags/AMR" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#AMR</a> since no carrier properly implements <a href="https://infosec.space/tags/AMRWB" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#AMRWB</a> anyway. Everyone who even halfasses <a href="https://infosec.space/tags/AudioQuality" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#AudioQuality</a> will plug in a headset anyway...</li></ul>But being able to just chug in a <a href="https://infosec.space/tags/SIM" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SIM</a> and test it by calling it is something people do need rather often!<ul><li>Even if it's just for a few calls like booking a data package on the go! </li></ul><a href="https://infosec.space/@kkarhan/113865596661922371" translate="no" rel="nofollow noopener noreferrer" target="_blank">https://infosec.space/@kkarhan/113865596661922371</a>

Kevin Karhan :verified:<a href="https://stephenwuebker.social/@stephen" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@stephen</a> <a href="https://digipres.club/@foone" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@foone</a> if you choose the spectrum wisely you can moonbounce... ^<ul><li>Tho that usually requires something like <a href="https://infosec.space/tags/Codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codec2</a> @ 450 bit/s on <a href="https://infosec.space/tags/SSB" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SSB</a>...</li></ul>

Kevin Karhan :verified:<a href="https://cloudisland.nz/@xssfox" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@xssfox</a> personally, I think <a href="https://infosec.space/tags/Codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codec2</a> is pretty awesome given it's a <a href="https://infosec.space/tags/FLOSS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FLOSS</a> codec that can work with as little as 450bit/s, making <a href="https://infosec.space/tags/DigitalVoice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#DigitalVoice</a> via <a href="https://infosec.space/tags/Moonbouce" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Moonbouce</a> possible!

Kevin Karhan :verified:<a href="https://mastodon.online/@pawagner" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@pawagner</a> in this case the person was (presumably amidst the background noise) in a callcenter and refused to acknowledge it's their fault and responsibility to not have noise AND legible audio quality.<a href="https://infosec.space/tags/Iridium" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Iridium</a> (<a href="https://infosec.space/tags/AMBE" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#AMBE</a>) <a href="https://infosec.space/tags/NATO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#NATO</a>-Radio (<a href="https://infosec.space/tags/MELP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MELP</a> & <a href="https://infosec.space/tags/MELPe" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MELPe</a>) and even <a href="https://infosec.space/tags/Codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codec2</a> is more legible than they were...

Kevin Karhan :verified:<a href="https://chaos.social/@DO9XE" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@DO9XE</a> <a href="https://norden.social/@hikhvar" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@hikhvar</a> <a href="https://chaos.social/@srslypascal" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@srslypascal</a> <a href="https://chaos.social/@nicoduck" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@nicoduck</a> <a href="https://einbeck.social/@stahlmann" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@stahlmann</a> <a href="https://mastodon.wurzelmann.at/@mimrma" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@mimrma</a> Wüsste nicht dass <a href="https://infosec.space/tags/Verschl%C3%BCsselung" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Verschlüsselung</a> verboten sei.<a href="https://infosec.space/tags/Datenfunk" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Datenfunk</a> nur auf den zugewiesenen Kanälen und die Frequenzzuteilungsbedingungen sind einzuhalten.<ul><li>Inkl. Konformität der Funkgeräte und keine Dauersendungen... </li></ul>Bei <a href="https://infosec.space/tags/Amateurfunk" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Amateurfunk</a>-Frequenzen ist Verschlüsselung verboten und offene Standards vorgeschrieben, weshalb <a href="https://infosec.space/tags/Codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codec2</a> entwickelt wurde...

Kevin Karhan :verified:<a href="https://toot.cat/@Gankra" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@Gankra</a> depends...<a href="https://en.wikipedia.org/wiki/XZ_Utils" rel="nofollow noopener noreferrer" target="_blank">xz</a> and <a href="https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm#LZMA2_format" rel="nofollow noopener noreferrer" target="_blank">lzma2</a> are pretty good when it comes to compression ratio, and with modern hardware they are sufficiently fast.<ul><li>But there's a reason a lot of stuff, like online games, use <a href="https://en.wikipedia.org/wiki/Bzip2#Efficiency" rel="nofollow noopener noreferrer" target="_blank">bz2</a> instead, since that allows speeds in excess of 600 Mbit/s even on low-end systems with minimal load, and in my experience allows compression of backups like <a href="https://infosec.space/tags/PostgeSQL" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PostgeSQL</a>'s <code>cluster_backup</code> at basically I/O speeds with <10% CPU load even at very old servers...</li></ul>So there's that... AFAICT xz is basically at the limit of lossless data compression - anything more efficient I know are extremely lossy narrowband codecs like <a href="https://infosec.space/tags/Codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Codec2</a> <a href="https://en.wikipedia.org/wiki/Codec_2" rel="nofollow noopener noreferrer" target="_blank">@450 bit/s</a> <a href="https://dspini.com/vocoders/lowrate/twelp-lowrate/twelp300" rel="nofollow noopener noreferrer" target="_blank">TWELP @ 300 bit/s</a> and <a href="https://infosec.space/tags/STANAG4591" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#STANAG4591</a> aka. <a href="https://en.wikipedia.org/wiki/Mixed-excitation_linear_prediction#STANAG-4591_(NATO)" rel="nofollow noopener noreferrer" target="_blank">MELPe</a> that sound like one has their ears filled with water and the person talking has a gag ball in their mouth and screams.

IT NewsBreak Free from Proprietary Digital Radio - Digital modes are all the rage these days in amateur radio — hams are using protoc... - <a href="https://hackaday.com/2023/08/05/break-free-from-proprietary-digital-radio/" rel="nofollow noopener noreferrer" target="_blank">https://hackaday.com/2023/08/05/break-free-from-proprietary-digital-radio/</a> <a href="https://schleuss.online/tags/amateurradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#amateurradio</a> <a href="https://schleuss.online/tags/digitalvoice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#digitalvoice</a> <a href="https://schleuss.online/tags/radiohacks" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#radiohacks</a> <a href="https://schleuss.online/tags/reflector" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#reflector</a> <a href="https://schleuss.online/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://schleuss.online/tags/standard" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#standard</a> <a href="https://schleuss.online/tags/codec2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#codec2</a> <a href="https://schleuss.online/tags/audio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#audio</a> <a href="https://schleuss.online/tags/codec" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#codec</a> <a href="https://schleuss.online/tags/radio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#radio</a> <a href="https://schleuss.online/tags/m17" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#m17</a>

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