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Linux Based Receivers
Dreambox Support Forum
Motorised Mystery - Multiple Dreambox 800HDs tried which do not drive various motors with 30m cable
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<blockquote data-quote="Terryl" data-source="post: 949935" data-attributes="member: 369937"><p>It could be too much DC voltage loss at the motor.</p><p></p><p>If it works with a short coax but doesn't with the longer one this could be the problem.</p><p></p><p>The coax used on a 30 meter run should have a pure copper center conductor, the DC voltage loss could be too high at the motor end if the coax can't handle the load due to a cheap copper plated steel core.</p><p></p><p>A quick check of the center conductor would be to use a small magnet, if it sticks to the center conductor its the copper plated stuff and that could be the problem.</p><p></p><p>You can check the DC resistance on the coax with a DVM, disconnect the coax at the motor and receiver, then short the center conductor to the shell of the connector with a small jumper, then take a reading at the other end.</p><p></p><p>You should see less then 1 ohm, if more then that then please post what it is and we can do a voltage loss calculation.</p></blockquote><p></p>
[QUOTE="Terryl, post: 949935, member: 369937"] It could be too much DC voltage loss at the motor. If it works with a short coax but doesn't with the longer one this could be the problem. The coax used on a 30 meter run should have a pure copper center conductor, the DC voltage loss could be too high at the motor end if the coax can't handle the load due to a cheap copper plated steel core. A quick check of the center conductor would be to use a small magnet, if it sticks to the center conductor its the copper plated stuff and that could be the problem. You can check the DC resistance on the coax with a DVM, disconnect the coax at the motor and receiver, then short the center conductor to the shell of the connector with a small jumper, then take a reading at the other end. You should see less then 1 ohm, if more then that then please post what it is and we can do a voltage loss calculation. [/QUOTE]
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Motorised Mystery - Multiple Dreambox 800HDs tried which do not drive various motors with 30m cable
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