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  1. New RF parts and new promises

    Thu 20 March 2025 By Dhiru Kholia

    Ismo (OH2FTG) recently introduced me to a bunch of Tokmas RF parts. Out of these, the Tokmas CID10N65F GaN FET stood out. It seems to have a lot of potential (for HF + 6m) at a very low price point.

    This RF MOSFET part can be purchased from LCSC.

    It seems …

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  2. 1W WSPR beacon @ 5V (2025)

    Fri 14 March 2025 By Dhiru Kholia

    I have designed, built and tested an all-HF WSPR beacon which produces 1W @ 5V and is rugged and cost-effective.

    1W WSPR Beacon

    Power consumption: Around 420mA @ 5V.

    Cost: Around 500 INR.

    Time to build: Less than 30 minutes.

    The files for this project are published here for personal (non-commercial) usage.

    For a 5W …

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  3. 100mW WSPR beacon (2025)

    Fri 14 February 2025 By Dhiru Kholia

    I have built probably the easiest, reasonably rugged and most cost-effective 100mW WSPR (or FT8) beacon.

    100mW WSPR Beacon

    Here is my quick and dirty build with whatever I had laying around:

    Quick-N-Dirty Build

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

    Power consumption: Before RF generation starts -> 20mA …

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  4. 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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