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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VOI2EBVJDXFS6Z3YZUCVLOZSOFPIAB7H/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "VOI2EBVJDXFS6Z3YZUCVLOZSOFPIAB7H",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VOI2EBVJDXFS6Z3YZUCVLOZSOFPIAB7H/?format=api",
    "sender": {
        "address": "tom.k3io (a) gmail.com",
        "mailman_id": "a3cf919d50e34818957525c30686cb1e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/a3cf919d50e34818957525c30686cb1e/emails/?format=api"
    },
    "sender_name": "Tom Clark",
    "subject": "[amsat-dc] Re: Fwd:  inquiry about homebrew az-el systems",
    "date": "2013-02-25T03:45:31Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I responded to Samudra Haque after a couple of preliminary Emails with \nthis idea on lo-cost az/el rotors. I presented the idea at an AMSAT-DC \nmeeting 3? years ago and showed a working kludge example. Somewhere in \nmy archives I have the Powerpoint from then and I will dig it up if \nthere is any interest, particularly from someone who wants to do some \ndevelopment!\n\n\nThe rotor scheme I described in my presentations is based on the DISEQC \nconsumer antenna control protocol \n(seehttp://en.wikipedia.org/wiki/DiSEqC \n<http://en.wikipedia.org/wiki/DiSEqC>) pushed by EUTELSAT and found in \nnearly every backyard satellite dish system (see \nhttp://www.eutelsat.com/satellites/pdf/Diseqc/associated%20docs/position_app_note_v1.pdf). \nThe DISEQC scheme superimposes DC (to run the rotors, switches, \ndownconverters, etc) plus RF (typically 500-1500 MHz IF satellite \ndownlinks) plus control (PWM 22 kHz tones) and it has an amazingly rich \ninstruction set. Many BUD (Big Ugly Dish) receivers include DISEQC \ncontrollers for controlling antenna position, polarization, \nbandswitching, etc.\n\nMost of the DISEQC rotors cover only 180 degrees and are very suitable \nfor elevation with 1 degree precision (see \nhttp://www.sadoun.com/Sat/Products/PowerTech/Sadoun-DG380B_HH_Motor.htm) \nfor example. Sadoun is a main suplier in USA.\n\nHowever I have found one 540 degree DISEQC Azimuth rotor \n(http://www.solidsignal.com/pview.asp?p=rotr100&d=eagle-aspen-rotr100-one-cable-antenna-rotator-(rotr100) \n<http://www.solidsignal.com/pview.asp?p=rotr100&d=eagle-aspen-rotr100-one-cable-antenna-rotator-%28rotr100%29> \n).\n\nTotal cost for a pair of az/el rotors is < $200 but the antennas that \ncould be controlled must be pretty small. My application was for a solar \nradio telescope using a couple of small DirectTV Ku-band dishes.\n\nI'd LOVE to find someone who was interested in developing a \nmicrocontroller/interface  for DISEQC az/el use. The coding should be \npretty simple. Also someone needs to figure out a scheme to adapt the \n\"crooked pipe\" on the elevation rotor to couple to a real antenna. Let \nme know if you can find someone who is interested.\n\nAlso, if anyone is interested, you might want to browse the Sadoun & \nSolid Signal web sites where you will also find DISEQC controlled 75 ohm \nRF switches good for low power use well into the microwave spectrum.\n\n73, de Tom K3IO (ex W3IWI)\n",
    "attachments": []
}