jks

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jks
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  • Demo of new user interface [now available in v1.154]

    jksjks
    Addition of classic LMS "denoiser" and "autonotch" filters:

    Least Mean Square (LMS) adaptive filters. The technique in ham radio is more than 25 years old now. But it remains a simple and sometimes effective solution, particularly for auto-notching interfering carriers. A simple and preliminary version of LMS filtering has been added to the new user interface demo. Better versions are being evaluated.

    The filter enable checkboxes are on the "audio" option tab. A "more" button opens an LMS_filter extension with sliders for some of the filter parameters. In particular the "beta" parameter can be adjusted to notch carriers without also notching CW signals since they are not transmitting continuously (but the notch will not be perfect). The denoiser does not work well for music and is better for voice-only AM transmissions. NBFM and IQ modes do not use the LMS filters at present.

    A few beta test Kiwis with better reception than http://kiwisdr.jks.com:8073 have been updated to run the new software:


    KA7U

  • Where is the antenna description entered in the administration page?

    jksjks
    For the main (land) page it's taken from the antenna field on the sdr.hu tab. The alternative was to have a separate antenna field on the webpage tab.

    rrobinet

  • Seeed KiwiSDR metal enclosure finally available!

    jksjks
    The 2m spur is right at 144 MHz. See this post: http://forum.kiwisdr.com/discussion/discussion/497/update-on-the-2-meter-band-interference-issue/p1

    KA7U

  • Grove code for KiwiSDR

    jksjks
    Good point. I have not looked into the Grove stuff. But from the PCB silkscreen near the connectors it seems one of the two Grove connectors provides UART and the other SDIO/I2C. These can also likely be put into GPIO mode with the right magic. And it should be possible to do an antenna switch extension backend for them.

    Each connector also has 3.3V/GND. So if you're using the new Kiwi aluminum enclosure you can move the fan to the other connector if necessary.

    WA2ZKD

  • Add waterfall rate to URL arguments

    jksjks
    No, the WSPR extension would actually still work because the DSP part is done on the Beagle. The transmission of the WSPR spectrum, decode information etc. happens separately from the audio and wf streams. You are correct that some extensions process the audio/IQ data in the browser. And for those a Mute cannot stop the audio/IQ data. That's one of the reasons handling the audio mute case is a little more complicated.

    KA7U