Nor would we have the technology for things like microwaves or baby monitors. Without FM radio, we wouldn’t have the emergency broadcasting services that paramedics and police regularly rely on today. However, it’s also one of the most valuable electromagnetic waves in human discovery. The FM radio frequency is a technology that many of us take for granted. However, few people know the complete history of radio, and what led them to enjoy the incredible sound quality available today. You should also make sure your exciter and amplifier are properly set up.Īn overview of JMPXRDS is included in a presentation at FOSDEM 2018.A source of entertainment, information, and worldwide communication – the radio has had a significant impact on the evolution of humanity.Īlmost a century after radio broadcasts first began, we still tune into our favourite shows every day, whether it’s in the car, at home, or on the way to work. The default settings together with a properly configured compressor/limiter will get you within the allowed deviation constraints (75KHz). In order to operate this properly you should also use some audio processing, we recommend Calf Studio Gear. It's currently used in production on 3 radio stations in Crete (UoC Radio 96.7, MatzoRe 89.1, Best 94.7). The generator itself is a standalone app and uses shared memory to communicate with the GUI/tools. The optional GUI is based on GTK3+ and can be used to fully control the generator, alternatively a set of command line tools are also available for headless systems. We 've tried this with RPi + HiFi Berry and Odroid + HiFi Shield. The signal can be used to drive an FM exciter via a normal sound card. A client for the RTP server is also available as well as a GNU Radio - based receiver for debugging. Note that RTP server sends the signal FLAC-encoded to reduce bandwidth. netcat/sox), and through a built-in RTP server. The generator output has a fixed sampling rate of 192000, it outputs data to a local unix socket (for the GUI to do FFT analysis and/or other uses e.g.
Built-in RTP server for sending the generated signal on a remote site.RDS Encoder with support for all basic fields.Multiple SSB modulators for the stereo subchannel (L-R).An FM MPX signal generator on top of Jack Audio Connection Kit with support for:
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