Just found a nice presentation about #diversity in the HF bands by Bruce Perens K6BP
Adrian
@yo8rzz@mastodon.radio
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Licensed amateur radio operator. Maintainer and former maintainer of several radio-related software. Mostly interested in SDR, DSP, radio standards (historical or in use).
Apparently a #SDR repeater just got authorized for usage in our area. The repeater uses a Lime Microsystems radio and GNU Radio for some of the DSP.
Got this block diagram from the authorization documentation
Daniel EstévezNew blog post: First analysis of the Lunar GNSS Receiver Experiment data. I have developed a high-sensitivity GPS acquisition algorithm in CUDA and ran it on the experiment datasets. 1 to 3 satellites are detected in 60% of the recordings.
Link to binary packages:
https://github.com/qradiolink/qradiolink/releases/tag/0.9.2-2
QRadioLink version 0.9.2 has been released today.
Changelog:
* Fixed low output power in SSB mode
* Improved Controlled Envelope SSB transmitter with correct parametrization
* Added audio compressor for SSB and AM modes with more aggressive settings
* Improved AM transceiver
* Some fixes for DMR promiscuous mode receive
* Fixed includes on some distributions
I must thank Ron W6RZ for his guidance on setting up the Controlled Envelope SSB parameters properly.
Bruce Perens K6BPM17 LinHT SDR HT Prototype Revision "B". Developers are mainly funding their work out-of-pocket. Please donate at https://www.paypal.com/donate/?hosted_button_id=4HTHZCS8UYPU6 (the name there is in Polish). This single-band 440 HT already communicates using M17, SSB, FM, receives TETRA, and a 2MBPS per second data mode. Not ready for production, TBD are amplifier shut-down transistor for power-saving, GNSS, more testing and revision.
Here is a video comparing SSB and FM transmission with and without audio companding. Audio compression actually lowers the SSB single tone output power by about 6-7 dB, but the compressed audio seems more readable across a wider audio range.
Compressor adjustment methodology: a test audio file with normalized audio to -1.0f - 1.0f interval (highest peak at 1.0f), played on a virtual Pulseaudio sink with the play command.
Audio compressor effect on SSB and FM modulation
If you have a SatYAML file that works for a given recording, please send a pull request to get it upstreamed, linking the recording you used to test it. This takes a minute to do and benefits everyone. Thank you for your support!
I've added SatYAML (configuration) files to gr-satellites for 24 satellites launched during 2025 that transmit on amateur radio spectrum. I'd like to request help from the community to keep gr-satellites updated with new launches, as it is hard for me to keep track of everything. I occasionally see SatYAML files shared in social media or forums, but it is hard to keep track of them in this way.
Abraxas3d W5NYVThings are moving very fast for an #opulentVoice ASIC.
This is on track to be the first #opensource #hamradio chip in the world, and will have much better voice quality and user experience than any other digital voice option out there. Radio hardware to follow.
Funding and partners are now in place, despite tariff and supply chain challenges.
It's an honor and privilege to work with a fantastic international team of ORI volunteers.