G4DYA

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G4DYA
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  • Flatness of KiwiSDR response < 500 kHz?

    G4DYAG4DYA

    I've done some measurements on the frequency response of the Kiwi below 1 MHz. Using a -53 dBm tone (S9+20) from a calibrated signal generator, I got -53 dB on the S meter down to 50 kHz. It rolled… (more)

    HB9TMCka9q

  • Combining/Diplexing Antennas to Single Kiwi

    G4DYAG4DYA
    I'm using a diplexer to combine a Wellbrook loop with a 27m horizontal terminated folded dipole (TFD). The crossover frequency is about 1.7 MHz. (I found the TFD marginally better on 1.8 MHz.) The… (more)
    Powernumpty

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

    G4DYAG4DYA
    I'm attempting to provide cooling for a BBAI in a Seeed case. Without the end plates, two 5V 25mm fans side-by-side works well.

    First, I installed the AI but didn't use star washers next to the board -… (more)
    HB9TMCPowernumptyrz3dvp

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

    G4DYAG4DYA
    The BB version seems to be over-riding the Kiwi's network settings at boot and using DHCP regardless of whether it's configured for DHCP or static. If you're using a non-NATted static IP this can be… (more)
    Powernumpty

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

    G4DYAG4DYA
    I'm attempting to provide cooling for a BBAI in a Seeed case. Without the end plates, two 5V 25mm fans side-by-side works well.

    First, I installed the AI but didn't use star washers next to the board -… (more)
    HB9TMCPowernumptyrz3dvp

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

    G4DYAG4DYA
    I'm attempting to provide cooling for a BBAI in a Seeed case. Without the end plates, two 5V 25mm fans side-by-side works well.

    First, I installed the AI but didn't use star washers next to the board -… (more)
    HB9TMCPowernumptyrz3dvp

  • GPS antenna alternatives

    G4DYAG4DYA
    There doesn't seem to be anything wrong with the PCTEL GPS-TMG-40N antenna's current draw. The data sheet says <=40 mA, and I've just measured mine at 23 mA, both well within the Kiwi's 50 mA current limit.
    Powernumpty

  • GPS antenna alternatives

    G4DYAG4DYA
    On second thoughts, I don't think my antenna is going deaf at times. The Kiwi seems to struggle to acquire sats when the server has been running for a few hours. Last night it had 11-12, but by this… (more)
    Powernumpty

  • GPS antenna alternatives

    G4DYAG4DYA
    This is what my shadow map looks like after 18 hours. As expected, there's not much low-elevation stuff in some directions because of trees. In other directions, where the optical horizon is 20+ km… (more)
    M0TAZ

  • Opinions needed: Ham radio digital modes -- what's currently being used?

    G4DYAG4DYA

    Pactor - no FOSS decoder AFAIK, but specification is open: https://www.p4dragon.com/downloads.html (under Documents).

    FreeDV - little activity outside activity periods, but there seems to be quite a… (more)

    Holger