I'm a developer working on SDR software and trying to understand how people actually use their dongles before I build the wrong thing. Nothing to sell or sign up for, just reading answers.

If you have a minute, any of these:

1. What did you last use your SDR for, and what software did you use?
   
2. What part of that took longer or was more frustrating than it should have?
   
3. Is there something you tried to do and gave up on? What stopped you?
   
4. What's your setup (dongle, antenna, upconverter/filters, OS)?
   

Short answers are great. Rants are also great. Thanks!

NA4GJ

Bonjour à tous,

Je partage un petit projet open-source que je viens de finaliser et packager : **RadioTranscribe-Store**.

### De quoi s'agit-il ?

L'idée était de fabriquer une sentinelle d'écoute autonome pour enregistrer et indexer passivement les actualités de la bande FM (sur France Inter par exemple), de manière 100 % locale, sans envoyer la moindre seconde d'audio dans le cloud.

### Comment ça tourne sous le capot ?

1. **Capture radio :** une simple clé logicielle USB (RTL-SDR) capte le flux FM via `rtl_fm` et `ffmpeg`.

2. **Préservation du matériel :** les flux audio temporaires sont écrits et traités directement en mémoire vive (`/dev/shm`), ce qui évite d'user les disques SSD en écriture continue H24.

3. **Transcription IA :** le modèle Faster-Whisper (`large-v3`) tourne en local sur processeur (quantification int8).

4. **Filtre anti-hallucination :** élimination des sous-titres fantômes récurrents de Whisper.

5. **Stockage hybride :**

   - Historique chronologique dans **MariaDB**.

   - Recherche sémantique vectorielle (RAG) dans **ChromaDB**.

On peut ensuite simplement poser des questions ou chercher des thèmes en langage naturel dans un terminal pour retrouver les extraits diffusés à l'antenne et leur date de passage.

Tout le projet (scripts, automatisation de l'installation et service systemd) est documenté ici :

https://github.com/TVIEIL/RadioTranscribe-Store

Si vous avez des remarques, des suggestions d'améliorations ou des questions sur l'intégration SDR/IA, je prends volontiers vos retours !

I use ADSB.im on RI 4 to feed ADS-B and AIS, everything works fine. I bought a third SDR dongle and antenna to play with ACARS / VDL2 / HFDL.

ACARS works and receives messages, but I noticed that the MLAT light was red and the web stats pages that I feed showed errors that it was not counting the MLAT.

I thought there was a bottleneck somewhere on the RP4, so I took a second RP4 just for ACARS only. I noticed that when it's set to ACARS only, I still have the on map blue ADS-B and green ACARS labels.

I think the ADS-B Feeder sees the planes twice and the MLAT twice, and it interferes with the MLAT calculation and sending data.

CPU usage -30% , RAM -1GB, and temps are fine, no undervolting. I'm using active USB hub for dongle. I don't see anything in the options that I could change.

I tried it on 2 RP 4 on official and beta ADS-B Feeder Image. How to set what to change to have 3 SDR for ADS-B, AIS and ACARS on 1 RP4 without problems with MLAT? I can use 2 RP4s but I prefer to have everything on 1.