jks

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jks
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  • GPS frequency correction response time?

    Hi John. Yes, probably. The algorithm chosen for the GPS update of the ADC XO frequency was checked by opening the door to the outside (on a winter's day) that is adjacent to where the Kiwi is developed and watching what happened. At the time the GPS time/position output was a lot noisier than it is now (thanks Christoph!) so that was the tradeoff. And of course the whole thing is not a PLL (and definitely not a GPSDO). It's more of a FLL.
    N8UR
  • DRM Heard

    Happy to see Voice of Nigeria using DRM mode C instead of the usual mode B to combat the selective fading and other problems. Even if it means their bit rate drops to 9.1 kbps (see table 5.2 "DRM system bit rates" page 21 https://www.drm.org/wp-content/uploads/2019/02/DRM-Handbook.pdf, bit rate also because MSC using 16-QAM and protection level=0). Also note their transmitter is ~110 Hz low, lol.

    When HF broadcasters switch to using the xHE-AAC codec (like India uses for MW) they should get better audio quality using lower bit rates.

    image
    fractional_n
  • URL to get current user information [solved by parsing the log file]

    Providing this information via a URL opens up a lot of cans of worms I don't have time to deal with. You can't provide user info accessible to anyone (like /status) because the privacy crowd will show up with torches and pitchforks (we've had enough trouble in the past with the issue of user ip addresses and geolocations). And you can't add a quick and easy authentication scheme (like adding the admin password in cleartext to the URL) without the security people jumping down my throat again.
    cathalferris
  • DRM Heard

    @arnie: Station name in Chinese (via UTF8) is in today's v1.375 release. Thanks for mentioning that.
    fractional_n
  • v1.374: new TDoA algorithm

    v1.374 has a new, more accurate TDoA algorithm from Christoph. It is used by default. There is a checkbox "Old algorithm" in the TDoA options column at top right to revert/compare. Also, you can use the URL parameter "old:" if necessary.
    G0LUJrz3dvpKA7U