Koden MD3000 radar

Discussion in 'The Projects Forum' started by debe, Dec 30, 2010.

  1. debe

    Thread Starter Well-Known Member

    Sep 21, 2010
    946
    184
    Thaught id post a little project from last year. I was given a Koden 32Nm radar which inermitently woud blow the main fuse, these things only pull about 6A on 12V. Since it was working perfectly untill it would blow the fuse, i just had to fix it. Eventually found it was the antena rotating motor that was at fault & not avalable. Managed to actualy get a workshop manual for it, removed the motor & found it was a fixed speed motor the size of a Cassete player motor but had a small disk with slots in it, this was for azimuth pulses for sweep rotation info for the TV type display. I removed the motor & pressed the armature off the shaft & shortened the motor body so it was just a double bearing assy. Then shifted the slotted disc further on to the shaft & shifted its optical pickup to match. This left room to fit a counter clockwise Cassete motor into the bottom af the assy.To join the new motor to the old shaft, used a small brass sleeve with 2 small grub screws acessable through holes drilled in the side of the old motor housing. As you can see by the pics it just fitted (the brass sleeve was from an old VCR tape guides that thread the tape around the drum). It was just a matter of ajusting the motor speed for this aplication about 2400Rpm on the motor to give 24RPM on the antenna. Re ass unit & now have a good Radar.
     
    Last edited: Dec 30, 2010
  2. debe

    Thread Starter Well-Known Member

    Sep 21, 2010
    946
    184
    More Pics.
     
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