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GET /hyperkitty/api/list/[email protected]/email/CLOQYBU3FX2QD32ZMTRJOW3ZPNOG7XYE/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CLOQYBU3FX2QD32ZMTRJOW3ZPNOG7XYE/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "CAKdmorVioz0zcJ_zH2AQw+aUVNzkrs5BqgrNmawxruZ6QLe16A@mail.gmail.com", "message_id_hash": "CLOQYBU3FX2QD32ZMTRJOW3ZPNOG7XYE", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CLOQYBU3FX2QD32ZMTRJOW3ZPNOG7XYE/", "sender": { "address": "kb3pmr (a) gmail.com", "mailman_id": "17744276ccf34b58a9823a86aaad0574", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/17744276ccf34b58a9823a86aaad0574/emails/" }, "sender_name": "Robert C. Campbell", "subject": "[amsat-bb] Re: inquiry about homebrew az-el systems", "date": "2013-03-02T10:55:49Z", "parent": null, "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XMMSEH5MPI6CAKEIUSDRSXXUDY4HYLFB/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Unless we want lightning fast antenna rotation, we're going to need some\nsort of gearbox with virtually any motor we're likely to find. We could\ngear the drive to a simpler pot as well.\n\nGus, I used a pulse width modulator to slow my DC motor down with out\nhaving to loose a lot of power. This eliminated the resistor and the motor\nran cooler. Mine cost $80.00 usd out of Canada but I understand that they\nare nothing more then modified fluorescent light dimmers.\nMy thought would be to count the pulses instead of a pot. I think we will\nbe stuck with gear motors if the goal is to go small and have lots of\ntorque.\nEven with the PWM mine was a gear motor but it beats a big restive load\nhands down.\n\nI would like to move away from stops and find another way to establish\n0~360az and 0~90/180ex indication so as to enable continuous rotation to do\n continuous sky scan or search and rescue with out having to wind up and\ndamage my coax. I am not sure what battle ship radar uses for constant\nrotation but that would be the ticket.\n\n\nBob Campbell\nKB3PMR\n", "attachments": [] }