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DISH SETUP: Single sat, Multi-Sat & Motorised
Strange problem with no power to motor
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<blockquote data-quote="jeallen01" data-source="post: 1150033" data-attributes="member: 176704"><p>In reply to your sitrep:</p><p></p><p>I think you possibly misunderstood the advice on connecting the shield and core together and so you now just have rather a "mishmash" of incorrect connections, and thus the measurements you gave are rather meaningless!</p><p></p><p>What was initially recommended relates to the originally installed cable <strong>ONLY</strong>, and so:</p><p>1) disconnect the indoor end from the receiver and the dish end from the motor - thus theoretically completely isolating the cable from <strong><em>anything </em></strong>else.</p><p>2) connect the shield and core of the cable together AT ONE END ONLY!</p><p>3) At the OTHER end of the cable, connect one DMM lead to the cable core and the other to the shield and try to measure the resistance.</p><p></p><p>The resistance should be only a very few Ohms if both the core and shield are both continuous and undamaged. However, if the resistance is high then one or other of them is damaged/broken.</p><p></p><p>If the latter is true then</p><p>1) disconnect both of the DMM leads from that original cable, </p><p>2) at the other end of the cable, disconnect the core from the shield</p><p>3) Then, using your spare cable, connect the core of that to the core of the original cable at the dish end</p><p>4) connect the other end of that core to one of the DMM leads, and connect the other DMM lead to the original cable shield </p><p><em>NB: you don't have to use coax cable to make the external connection, asyou could equally well (and I have in the past!), just use a piece of basis single core wiring cable to make that connection!</em></p><p></p><p>Then you should be able to measure the resistance of that cable loop - if very low then the original cable shield is continuous and probably OK, but if it is high then there is a break somewhere in the original cable shield.</p><p></p><p>Note also that the motor & LNB draw 30-400ma, whereas the DMM measuring current is only a very few mA, so any DMM resistance measurement may not be totally representative in this sort of situation as the motor/LNB current will result in a higher voltage drop in the cable due to the core+shield resistance. In most cases like this then that difference can probably be ignored, but always bear that in mind!</p></blockquote><p></p>
[QUOTE="jeallen01, post: 1150033, member: 176704"] In reply to your sitrep: I think you possibly misunderstood the advice on connecting the shield and core together and so you now just have rather a "mishmash" of incorrect connections, and thus the measurements you gave are rather meaningless! What was initially recommended relates to the originally installed cable [B]ONLY[/B], and so: 1) disconnect the indoor end from the receiver and the dish end from the motor - thus theoretically completely isolating the cable from [B][I]anything [/I][/B]else. 2) connect the shield and core of the cable together AT ONE END ONLY! 3) At the OTHER end of the cable, connect one DMM lead to the cable core and the other to the shield and try to measure the resistance. The resistance should be only a very few Ohms if both the core and shield are both continuous and undamaged. However, if the resistance is high then one or other of them is damaged/broken. If the latter is true then 1) disconnect both of the DMM leads from that original cable, 2) at the other end of the cable, disconnect the core from the shield 3) Then, using your spare cable, connect the core of that to the core of the original cable at the dish end 4) connect the other end of that core to one of the DMM leads, and connect the other DMM lead to the original cable shield [I]NB: you don't have to use coax cable to make the external connection, asyou could equally well (and I have in the past!), just use a piece of basis single core wiring cable to make that connection![/I] Then you should be able to measure the resistance of that cable loop - if very low then the original cable shield is continuous and probably OK, but if it is high then there is a break somewhere in the original cable shield. Note also that the motor & LNB draw 30-400ma, whereas the DMM measuring current is only a very few mA, so any DMM resistance measurement may not be totally representative in this sort of situation as the motor/LNB current will result in a higher voltage drop in the cable due to the core+shield resistance. In most cases like this then that difference can probably be ignored, but always bear that in mind! [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Strange problem with no power to motor
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