![]() Let’s get the inside lowdown from the Pi lot.Īudio on Linux is really quite complicated. FLDigi can use Portaudio (WTF?) or Pulseaudio fine, which is why Mumble not working with Pulseaudio did my head in (Rant) Linux audio is desperately borked IMO I had nearly given up on using mumble until I discovered that wrinkle. Mumble only works 2 if you select the system ALSA which then reroutes though PulseAudio, which routes back through true ALSA. Raspberry Pi have moved to using PulseAudio to manage sound connections. However, Mumble on the data Pi bridged over the input from the Data jack lets me listen to the data signal coming in. You have to go in through the Mic jack to use LSB/USB/FM/AM, as the FT897 is a shack in a box I may use it on VHF as well. ![]() Currently I have the Pi going in through the data port on the back, which is only enabled for the DIGI mode, which is always USB. I will allocate another Pi specifically for Mumble for voice - going in through the mic input of the FT897. I will use FLRig’s PTT control to actuate the transmitter - it doesn’t matter what garbage I send to the mic input, it isn’t sent until I press PTT on FLrig. I set it to send audio all the time, and I will send my PC to send audio all the time. Mumble works well if combined with FLrig rig control. If my radio path depends upon some SaaS then roll with it, just use Zoom/Zello. The great thing about Mumble is there’s no Cloud in it. Indeed in my case the TX client and the server run on the same Pi4 that FLDigi/FLRig run on. There’s a PC Mumble client, so I can listen using my Windows PC to my radio, and the server can cope a couple of channels so I can listen to different radios when I get that far. What they mean by low-latency? Buffering seems to be < 50ms, using Opus codec on a LAN in my case. Mumble is a free, open source, low latency, high quality voice chat application. Mumble is a VoIP solution used by gamers. It had a latency of about 2 seconds, and was receive only Mumble For that a latency of 1 second was OK, and initial experiments showed icecast and darkice on a Pi2 would work OK to a browser. However, the first requirement I had was to hear the digimode signal. From previous experience a latency of 200ms is livable with for half duplex voice, but you have to work around that. I personally don’t get that, if it needs the internet then why not use Zoom/Zello/Network Radios, but each to their own. Some people remote their stations over t’internet. Running audio over an ethernet LAN is a world of hurt, and even more on wifi. Indeed MFJ make a remote solution based on a Pi called RigPi for 350 sods which looks dandy, but £350 is pushing it a bit for a box and an audio interface, although probably when I factor in my time mucking around I should have dropped the cash ) From the reviews on eham you still get to muck around ) Other radio amateurs solve this using Skype or TeamViewer, and there are hardware solutions. The rest of your family, of course, may regard that as A Good Thing, but it precludes you from using voice, and makes the experience just that little bit less real. ![]() The trouble, of course, with being in a different building from the rig is you can see the data coming in on the waterfall fine, but you can’t hear anything. I use FLRig CAT control rather than the digital VOX on my G4ZLP MiniPro interface because that doesn’t send OS dings and bongs to TX 1. You can get FLDigi to control the rig directly, and on Windows using FLrig was a world of hurt for me, but on linux FLrig was well-behaved with Hamlib, though I had to compile it because PTT didn’t work on my ancient steam-driven FT897 with the Raspbian version which was old. The Pi is a fabulous little shack computer, particularly if you aren’t in front of it, because it is low-power, does most of what you want with radio software-wise, and is pretty much expendable. I have used FLdigi successfully for digimodes with this setup, running it on a Raspberry Pi in the shack over WiFi. I am lucky enough to have an outbuilding with mains power, which is the obvious place for the radio gear.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |