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Joined 8 months ago
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Cake day: March 31st, 2025

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  • Mate do i have just the right thing for you, but it requires some soldering. It’s also probably cheapest solution working over longer range than you need

    First you need two directional antennas. Use this https://lea.hamradio.si/~s53mv/wumca/cup.html the 13cm design specifically. Design of the dipole element is on another page https://lea.hamradio.si/~s53mv/wumca/sbfa.html They’re using hard to get semirigid coax but you can really just use common RG178 with braid tinned to make it stiff. This way you don’t have to leave D section they way they did, you can just solder core to the shield at the end while preserving total length (or ~1-2 mm less, because wifi is slightly higher frequency; 53-52 mm total). That dummy cable thing can be just any stiff piece of wire. Good way to get this would be getting a pack of u.fl-SMA pigtails, which you can also use for connection.

    You also don’t need special aluminum housing like they do, cookie tin of the right size would be sufficient, or any other container of similar nature. If you can’t weatherproof it, putting it inside on windowsill is also fine

    Then, plug TL-WN722N into it, or some other single-antenna thing, and you’re set. This one connects over USB and has removable RPSMA antenna, so you can connect it easily with correct cable (SMA plug - RPSMA plug)

    to your new directional antenna. This thing works well over 200m distance, provided clear line of sight, and probably more than that
















  • Manufacturers, knowingly or unknowingly, use commercial-grade PG when making cough syrups to cut costs.

    i’d note that there’s zero technical reason why DEG would end up in PG. reaction of water with ethylene oxide gives you ethylene glycol, diethylene glycol and higher analogues and these are then separated by distillation. propylene glycol is made from propylene oxide instead, and it’s more expensive than ethylene oxide. diethylene glycol has little use on its own, at least compared to other glycols

    however,

    The physical properties of diethylene glycol make it an excellent counterfeit for pharmaceutical-grade glycerine (also called glycerol) or propylene glycol