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starsandrobots's profile
Star Simpson
Star Simpson
Star Simpson
@starsandrobots

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Star Simpson

@starsandrobots

I like to build things. Glider pilot. Eyes bigger than bookshelf.

SF Bay
Joined January 2009

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    Star Simpson‏ @starsandrobots Jul 10

    TIL — the Thai cave rescues were a HAM win! Go, open hardware! http://bcra.org.uk/creg/heyphone/  (via https://www.facebook.com/phil.karn.98/posts/10155276627256486 …)pic.twitter.com/KzOqgFYxsW

    8:56 PM - 10 Jul 2018
    • 623 Retweets
    • 1,219 Likes
    • Ratmir Karabut Reynaldo Verdejo Patrick Walters Michael Lawrence Angela N. Hunt abhilashjohn Stephen Chow R2robot Narancia 🍂🍃IT'S FINALLY AUTUMN!🍂🍃
    14 replies 623 retweets 1,219 likes
      1. New conversation
      2. Dan Plante‏ @Daniel_Plante Jul 10
        Replying to @starsandrobots

        Due to the short distance in water (less than 3km) and the availability of required power density, wouldn't a full duplex ultrasonic comm link be more effective/durable/predictable? I wouldn't cont on LF radio, or even ELF in that circumstance. Too many variables.

        2 replies 0 retweets 4 likes
      3. Dr Footleg‏ @drfootleg Jul 11
        Replying to @Daniel_Plante @starsandrobots

        The reason the HeyPhone was used is that we spend many hours doing practice rescue scenarios in the British cave rescue groups using this equipment. The radios are tried and tested in many cave environments. We know they work and don't fail in the muddy wet conditions.

        0 replies 4 retweets 59 likes
      4. End of conversation
      1. New conversation
      2. Pratyush Mohapatra‏ @pratyushpmhptr Jul 10
        Replying to @starsandrobots

        Wait i thought they used some radios by an Israeli firm. Let me see if i can find the video...

        1 reply 0 retweets 0 likes
      3. Pratyush Mohapatra‏ @pratyushpmhptr Jul 10
        Replying to @pratyushpmhptr @starsandrobots

        Here found it.... https://edition.cnn.com/videos/world/2018/07/04/radios-thailand-cave-rescue-liebermann-pkg-vpx.cnn …

        1 reply 0 retweets 1 like
      4. Pratyush Mohapatra‏ @pratyushpmhptr Jul 10
        Replying to @pratyushpmhptr @starsandrobots

        More details ...https://indianexpress.com/article/world/this-israeli-technology-helped-in-saving-cave-trapped-thai-soccer-team-5248055/ …

        1 reply 2 retweets 6 likes
      5. Pratyush Mohapatra‏ @pratyushpmhptr Jul 10
        Replying to @pratyushpmhptr @starsandrobots

        Okay i have other reputed and independent resources which can confirm that heyphones were used extensively.

        0 replies 1 retweet 13 likes
      6. End of conversation
      1. matt blaze‏Verified account @mattblaze Jul 10
        Replying to @starsandrobots

        Oh wow! @ka9q

        0 replies 1 retweet 7 likes
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      1. Prof. Daniel W. Bliss‏ @d_w_bliss Jul 11
        Replying to @starsandrobots @oshtim

        This old cave-rescue radio is really cool. It's a niche application that would not be well served otherwise. We could update the tech, but that might not make it more usable. Well done heyphone.

        0 replies 1 retweet 5 likes
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      1. New conversation
      2. Warlock of Wires‏ @MegavoltService Jul 10
        Replying to @starsandrobots

        Jeez you could darn near use a LM555 as a Local osc at that low of a freq . toss in a LM602 mixer and volla .

        1 reply 0 retweets 3 likes
      3. Aidan K.‏ @WellsiteGeo Jul 11
        Replying to @MegavoltService @starsandrobots

        It's not high date rate, and doesn't need to be. When I last looked at CREG they had moved on from 555s, but the band's were comparable. The electronics went over my head in the 1980s.

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. New conversation
      2. LongHairNasaGuy‏ @LongHairNasaGuy Jul 11
        Replying to @starsandrobots

        @kb1lqd @KB1LQC take note!

        2 replies 0 retweets 2 likes
      3. Brenton Salmi‏ @kb1lqd Jul 11
        Replying to @LongHairNasaGuy @starsandrobots @KB1LQC

        I've heard briefly about this a long time ago! Thanks for the heads up, gonna do some reading 😊

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. Radio & Nukes‏ @HamWa07 Jul 11
        Replying to @starsandrobots @tom_m0lte

        We did a 8.97khz experiment using ground rods and a 1000w audio amplifier! Things get very interesting when you drop into Lower LF and VLF. Not to mention the ELF submarine communications at 70-90Hz range! Of course SSB is not possible!

        0 replies 0 retweets 2 likes
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      1. New conversation
      2. Eleftherios Kosmas‏ @elkos Jul 10
        Replying to @starsandrobots @GlytchTech

        @ppapadeas since you are an open hardware/ham radio/diver I think that would be nice to check out with our cave dwelling friend @Konstantina_P 😀

        1 reply 0 retweets 2 likes
      3. 1 more reply
      1. Cecilia Glennon‏ @CeciliaGlennon Jul 11
        Replying to @starsandrobots @RichardHeartWin

        I came across this and just read it to a local net. Hams agree--very cool!

        0 replies 0 retweets 1 like
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      1. Jason Short‏ @jason4short Jul 11
        Replying to @starsandrobots @DJSnM

        My dad and his brother used to do this for fun ages ago. Maybe the 50’s. #KC8RD

        0 replies 0 retweets 0 likes
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      1. Edward L. Pumpkins‏ @elplatt Jul 11
        Replying to @starsandrobots

        Are you a ham?

        0 replies 0 retweets 0 likes
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      1. Rick Waldron‏ @rwaldron Jul 11
        Replying to @starsandrobots @make

        This is awesome!

        0 replies 0 retweets 0 likes
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      1. Aidan K.‏ @WellsiteGeo Jul 11
        Replying to @starsandrobots @cstross

        There is a counter-part to this. I don't know for certain, but I suspect that a major factor in the cas-evac was that the Navy divers had diver-diver comms. That is rare, very non-standard kit.

        0 replies 0 retweets 0 likes
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