jks

About

Username
jks
Joined
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Roles
Member, Administrator, Moderator
Points
217
Location
Tauranga, New Zealand RF82ci
Callsign
ZL4VO/KF6VO
Additional information
KiwiSDR support email: support@kiwisdr.com

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515Helpful469Awesome

  • BeagleBone AI

    jksjks
    Well, you can force the AI to run at 500 MHz. But the Kiwi server may have problems at that clock rate. From a shell window (via ssh/PuTTY connection or admin console tab) use the command "cf5". Then "cf" to check that it actually switched. Remember that the BBB/BBG runs at 1 GHz (fixed).

    Other commands are: 
    cf15 = 1.5 GHz
cf11 = 1.176 GHz
cf1  = 1 GHz
    cathalferris

  • New out of box KIWI updating issue. Compiles the same files over and over again. [git fetch issue]

    jksjks
    v1.377 contains a fallback that retries the git pull using a fixed ip address for github.com. Interestingly, about half way through checking the fix on Tony's Kiwi the git pull to github.com (using the domain name) started working. So that means this was probably a mirror server configuration issue by Github as opposed to an ISP issue. Anyway, the fix is in and will hopefully save someone some grief in the future.
    KA7U

  • Kiwi BBAI software installation instructions [updated 4-Mar-24]

    jksjks
    I don't know. If there is no code running that requires GPU cycles then I can't imaging it burns any power on its own just sitting idle.
    KA7U

  • GPS frequency correction response time?

    jksjks
    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

    jksjks
    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