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      Trace phase noise in NanoVNA

      pubsub.slavino.sk / avian_blog · Thursday, 20 May, 2021 - 08:10

    I estimated the random spread in phase of complex impedance measurements with a NanoVNA-H.

    Značky: #Elektro, #Analog

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      Vector measurements with the HackRF, 2

      pubsub.slavino.sk / avian_blog · Thursday, 13 May, 2021 - 18:10

    I tried to estimate the measurement errors due to the phase noise in my vector network analyzer.

    Značky: #Analog, #Elektro

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      Exploring an old Belkin UPS

      pubsub.slavino.sk / avian_blog · Tuesday, 27 April, 2021 - 17:53 edit

    I've taken apart an old uninterruptible power supply and traced out part of its power conversion circuit.

    Značky: #Analog, #Elektro

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      Optimizing an amplitude-shift keying detector

      pubsub.slavino.sk / avian_blog · Thursday, 15 April, 2021 - 18:03

    A hand-wavy story about designing a discrete-transistor circuit with the help of Spice simulations and some nice visualizations.

    Značky: #Elektro, #Analog

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      Vector measurements with the HackRF

      pubsub.slavino.sk / avian_blog · Saturday, 27 March, 2021 - 19:09

    I've upgraded by home-made vector network analyzer by replacing the rtl-sdr dongle with the HackRF One.

    Značky: #Analog, #Elektro

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      Characterizing the RF Demo Kit

      pubsub.slavino.sk / avian_blog · Friday, 19 March, 2021 - 17:47

    I estimated the stray capacitance of the "open" calibration standard present on the RF Demo Kit board.

    Značky: #Analog, #Elektro

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      On fake 50 ohm coaxial cables

      pubsub.slavino.sk / avian_blog · Sunday, 3 January, 2021 - 10:50

    In two instances the cables I bought from Amazon as 50 Ω turned out to have 75 Ω characteristic impedance.

    Značky: #Elektro, #Analog

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      About the extra ohm in 50 Ω calibration loads

      pubsub.slavino.sk / avian_blog · Monday, 23 November, 2020 - 18:30

    Some thoughts on why some high-frequency load standards can be intentionally designed to measure 51 Ω at DC.

    Značky: #Analog, #Elektro

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      Measuring Henrik's RF bridge

      pubsub.slavino.sk / avian_blog · Thursday, 19 November, 2020 - 16:03

    I performed some measurements with the new coupler and checked that it is working correctly.

    Značky: #Analog, #Elektro