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jks

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jks
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  • Single URL/bookmark can now open multiple windows/tabs

    In v1.83 you can now say, e.g. kiwisdr.local:8073/?ext=wspr,40m&mute&win2&ext=wspr,30m&mute

    G8JNJWA2ZKDLX1DQf1jek
  • Nice email from a listener

    I received this email just now:

    Good afternoon. I was hoping you could relay a group message to all those currently providing remote access on SDR.hu

    “I would like to extend my deep appreciation to all the remote providers. The service you provide has given me countless hours of enjoyment. Unfortunately, I am not in a position to purchase my own equipment. Possibly, one day in the future.

    The remote providers continue the amateur radio enthusiast’s exemplary commitment to public service.
    Thanks again for providing this wonderful service. The time, not to mention expense, required to provide this service, has not gone unnoticed.”

    rickf
    Hilliard, OH, USA
    WA2ZKDKA7UBjarneTonda
  • v1.98 changes/improvements [right-click menu]

    The v1.98 release contains:

    Another round of security and memory handling fixes.
    Some fixes that should mostly eliminate the sudden shifting/tearing of the FAX display (this is different from the skew/slant correction adjustment that still needs to be added).
    A new right-click / right-button menu containing items that were only accessible on hard-to-remember keyboard shortcuts (database lookups, passband restore, etc.)
    If you're the Kiwi's admin, a new graphically-assisted way of setting the manual ADC clock calibration if you're not using GPS cal. See config tab of admin page for instructions.


    WA2ZKDf1jekLX1DQ
  • QZSS Support [GPS, added in v1.170]

    I have recently moved to a new location where I have a limited view of the sky. Either blocked by other apartment buildings or a nearby (hopefully inactive) volcanic cone. The addition of the QZ sats really improves the amount of time I have enough sats in view (4) to compute location fixes.

    WA2ZKDfractional_n
  • GPS Admin screen

    v1.60, to be released tomorrow, will fix a GPS bug that I finally understood today. Apparently, since v1.38 the GPS acquisition process has not been restarting after active users disconnect like it's supposed to. That will lead to the situation where the admin GPS page says "acq yes" (instead of "acq paused"), but there is no refresh icon shown in the "acq" column next to an incrementing PRN as is typically the case. The satellites that are already acquired and being tracked will be be fine until they drift out-of-range and are dropped. So eventually the GPS page will show nothing even though new satellites should be getting acquired.

    M0TAZWA2ZKDKA7U
  • dx.json

    This whole thing is hopefully going to be fixed soon..

    WA2ZKDM0TAZ
  • GPS: Galileo reception possible on Kiwi?

    The recent addition of the QZSS sats (Asia/Oceania reception only) increases the percentage of time enough sats are available for fixes (minimum 4 sats required). This is especially true for GPS antennas that don't have a full view of the sky (i.e. shadowed by terrain or buildings). It certainly made a big difference at my NZ location. Since the Galileo E1 signal transmits on a frequency compatible with the Kiwi the question has been asked if it can also be received. It has worldwide reception and so would be very helpful.

    I think the majority of Kiwi owners struggle just to get the supplied antenna near a window, let alone outside and up high. Anything we can do to increase the percentage of Kiwis with functioning GPS would be very useful (e.g. more candidate Kiwis to participate in direction finding experiments). Plus they benefit from automatic, accurate frequency calibration of the SDR.

    I don't know much about HF-DF / triangulation, but fortunately we have a Kiwi user that does. He's already got it working! See: http://hcab14.blogspot.com

    KA7U
  • DDC on FPGA

    Hi. That is an excellent question.

    If you look carefully at the free version of the DUC/DDC compiler provided with Vivado you'll see that it is not general purpose. It is targeted to the cell phone industry (LTE/CDMA) and does not have the bit widths, clock rates and decimation factors needed by the Kiwi.

    The Kiwi does take advantage of some Vivado IP blocks, like the DDS compiler. And it makes very heavy use of the Artix DSP blocks to save FPGA fabric gates. We also wanted to have a design fully independent of any FPGA manufacturer's architecture in case we need to change devices in the future. It was also a learning experience for us to implement everything from first principles.

    KA7Utrain04
  • QZSS Support [GPS, added in v1.170]

    v1.172 adds a switch to the admin page GPS tab called "include alerted?" that overrides the exclusion of alerted sats from the position fix. The alert "A" symbol will appear green instead of red when the sat is actually being used. It will be interesting to see if some position fixes get worse when alerted sats are included.

    fractional_n
  • Grove Project

    The Kiwi code does not modify /boot/uEnv.txt but instead uses an older method for setting up the GPIO pins it needs.

    Be very careful when editing that file. Make a backup copy in that directory. Certain mistakes will brick your Beagle. And the recovery method is annoying (USB or serial cable needed).