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  1. Ubuntu Going Downhill

    Sun 09 February 2025 By Dhiru Kholia

    I am a bit late to realize that Ubuntu is going downhill and has been for a while.

    Here are a couple of things of things I have noticed about Canonical/Ubuntu:

    • Forced paid updates even for active life OS versions

    • Series of bad decisions (Mir, Unity, Upstart, Snaps) causing …

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  2. 250mW WSPR beacon (2025)

    Sun 09 February 2025 By Dhiru Kholia

    I am building an easy-to-use and cost-effective WSPR pHAT for Raspberry Pi Zero 2 W.

    3D render:

    250mW WSPR Beacon

    We have replaced the traditional expensive Mini-Circuits transformer with a cost-effective Bourns coupled inductor.

    Results: To be built and tested soon!

    Time to build: Less than 20 minutes

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  3. My PA0FRI Active Antenna

    Sat 08 February 2025 By Dhiru Kholia

    My homebrewed PA0FRI Active Antenna seems to be working well from a very physically constrained location.

    3D render:

    PA0FRI Active Antenna Render

    Schematic:

    PA0FRI Active Antenna Schematic

    Results:

    PA0FRI Active Antenna Results

    The antenna is connected to a RSP1 Clone SDR which is running custom FT8-band-hopping software. I am using a SOLID 4-Way 5-2400 MHz RF splitter to connect multiple SDRs to …

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  5. Easy Taint Tracking - Finding Heartbleed in 2024

    Fri 01 November 2024 By Dhiru Kholia

    Aim

    Finding 'Heartbleed' class of bugs with taint analysis.

    Background reading: https://heartbleed.com/

    Motivation

    While Coverity is now able to detect this bug, we wanted to evaluate the state of open-source security tooling in 2024.

    Have we been able to reduce the cost of finding such bugs after all …

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