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#1
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rotor cable voltage drop
I'm installing a 60ft tower about 400ft from my house for uhf/vhf. I'm
planning to use a Channel Master rotor which I haven't purchased yet. I've buried 1"pvc conduit to tower and planning the wire pull for the antenna & satellite coax plus the rotor cable. From my research 3c/22ga. wire will control all C M rotors. Since I don't know the power requirements yet of the un-purchased rotor I can't calculate the voltage drop on appx. 500ft of 22 ga wire to see if it will be sufficient. Can somebody either reply with the typical C M rotor current/voltage/watts or first hand knowledge of the correct wire gauge for a 500ft run. Thanks Jeff |
#2
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rotor cable voltage drop
"Jeff Dieterle" wrote in message ... I'm installing a 60ft tower about 400ft from my house for uhf/vhf. I'm planning to use a Channel Master rotor which I haven't purchased yet. I've buried 1"pvc conduit to tower and planning the wire pull for the antenna & satellite coax plus the rotor cable. From my research 3c/22ga. wire will control all C M rotors. Since I don't know the power requirements yet of the un-purchased rotor I can't calculate the voltage drop on appx. 500ft of 22 ga wire to see if it will be sufficient. Can somebody either reply with the typical C M rotor current/voltage/watts or first hand knowledge of the correct wire gauge for a 500ft run. Thanks Jeff I wonder if a larger conduit would be desirable for a larger diameter co-axes, else the losses might be unacceptable and to fit all these cable in - is it OK to run these so closely together over such a long distance ? Nick |
#3
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rotor cable voltage drop
Nick wrote: "Jeff Dieterle" wrote in message ... I'm installing a 60ft tower about 400ft from my house for uhf/vhf. I'm planning to use a Channel Master rotor which I haven't purchased yet. Also, be aware that many of these rotors are Capacitor Start motors. So, where is the Capacitor? Well, its in the Control Box (to make it simple to get to, when it ages/or gives up). Tho these are easy to access, my question would also be (since these cap leads are quite long, and RESISTIVE to get to the rotor), is just what effect these long (thus HIGHer) resistance and thus, volts limiting going to do to the rotor speed ? I hope I stated this correctly. Anyone have experience with this? Jim NN7K |
#4
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rotor cable voltage drop
Hi Nick,
Not sure where you going with the larger conduit and what type of losses. From my limited knowledge, conduit fill is a function of the rated wire ampacity and the resultant I-sqr'd-R loss if the wire is pushed to rated ampacity, which shouldn't be an issue on the coax, and a later poster replied with the correct rotor wire size. If you talking about signal loss on RG6 over that distance I've had that cable laying on the ground to the tower location for a couple of years and get a strong signal, physical damage to the exposed wire is the problem. I assumed the coax shielding, properly grounded would take care of problems running in the same conduit with Sat. TV and Rotor wiring Please reply if you have more insight on this. Thanks Jeff "Nick" wrote in message ... "Jeff Dieterle" wrote in message ... I'm installing a 60ft tower about 400ft from my house for uhf/vhf. I'm planning to use a Channel Master rotor which I haven't purchased yet. I've buried 1"pvc conduit to tower and planning the wire pull for the antenna & satellite coax plus the rotor cable. From my research 3c/22ga. wire will control all C M rotors. Since I don't know the power requirements yet of the un-purchased rotor I can't calculate the voltage drop on appx. 500ft of 22 ga wire to see if it will be sufficient. Can somebody either reply with the typical C M rotor current/voltage/watts or first hand knowledge of the correct wire gauge for a 500ft run. Thanks Jeff I wonder if a larger conduit would be desirable for a larger diameter co-axes, else the losses might be unacceptable and to fit all these cable in - is it OK to run these so closely together over such a long distance ? Nick |
#5
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rotor cable voltage drop
"Jeff Dieterle" wrote in message ... Hi Nick, Not sure where you going with the larger conduit and what type of losses. From my limited knowledge, conduit fill is a function of the rated wire ampacity and the resultant I-sqr'd-R loss if the wire is pushed to rated ampacity, which shouldn't be an issue on the coax, and a later poster replied with the correct rotor wire size. If you talking about signal loss on RG6 over that distance I've had that cable laying on the ground to the tower location for a couple of years and get a strong signal, physical damage to the exposed wire is the problem. I assumed the coax shielding, properly grounded would take care of problems running in the same conduit with Sat. TV and Rotor wiring Please reply if you have more insight on this. Thanks Jeff Hi Jeff, I may have read it wrong, but I understand that the run from the shack to the tower is some 400 feet, and the conduit is one inch diameter... This to take a feeder ( presumably co-ax) and a rotator control cable and possibly a separate co-ax for the satellite ? I would have thought the co-ax would have to be quite a large diameter to minimise losses, and this with the other one (or two ?) cables down a 1" conduit that long just struck me as completely impossible and possibly undesirable from interaction effects ? Nick |
#6
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rotor cable voltage drop
Nick
I'm not concerned with the wire pull, I'll come out of the ground to a pull box at the 1/2 way point and the 1"C will be large enough, with plenty of soap I should be able to pull it by hand. But can you expound on your concerns with the interaction effects. Thanks Jeff "Nick" wrote in message ... "Jeff Dieterle" wrote in message ... Hi Nick, Not sure where you going with the larger conduit and what type of losses. From my limited knowledge, conduit fill is a function of the rated wire ampacity and the resultant I-sqr'd-R loss if the wire is pushed to rated ampacity, which shouldn't be an issue on the coax, and a later poster replied with the correct rotor wire size. If you talking about signal loss on RG6 over that distance I've had that cable laying on the ground to the tower location for a couple of years and get a strong signal, physical damage to the exposed wire is the problem. I assumed the coax shielding, properly grounded would take care of problems running in the same conduit with Sat. TV and Rotor wiring Please reply if you have more insight on this. Thanks Jeff Hi Jeff, I may have read it wrong, but I understand that the run from the shack to the tower is some 400 feet, and the conduit is one inch diameter... This to take a feeder ( presumably co-ax) and a rotator control cable and possibly a separate co-ax for the satellite ? I would have thought the co-ax would have to be quite a large diameter to minimise losses, and this with the other one (or two ?) cables down a 1" conduit that long just struck me as completely impossible and possibly undesirable from interaction effects ? Nick |
#7
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rotor cable voltage drop
"Jeff Dieterle" wrote in message ... Nick I'm not concerned with the wire pull, I'll come out of the ground to a pull box at the 1/2 way point and the 1"C will be large enough, with plenty of soap I should be able to pull it by hand. But can you expound on your concerns with the interaction effects. Thanks Jeff I really don't know what, if any, there might be - bad swr would be worse than good of course but perhaps that will be sorted at the antenna end anyway - inductive coupling perhaps ? All the best - looking forward to the update with results ! Nick |
#8
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rotor cable voltage drop
"Jeff Dieterle" wrote in message ... I'm installing a 60ft tower about 400ft from my house for uhf/vhf. I'm planning to use a Channel Master rotor which I haven't purchased yet. I've buried 1"pvc conduit to tower and planning the wire pull for the antenna & satellite coax plus the rotor cable. From my research 3c/22ga. wire will control all C M rotors. Since I don't know the power requirements yet of the un-purchased rotor I can't calculate the voltage drop on appx. 500ft of 22 ga wire to see if it will be sufficient. Can somebody either reply with the typical C M rotor current/voltage/watts or first hand knowledge of the correct wire gauge for a 500ft run. Thanks Jeff Hi, Jeff - I could find only one rotator on the Channel Master Web site. The manual for it is http://www.pctinternational.com/chan...al_9521_37.pdf and page 1 tells required wire size vs length. Looks like you need 18ga. Cheers, John KD5YI |
#9
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rotor cable voltage drop
Hi John KD5YI,
Thanks for the link. That's the info I needed. Jeff "_._ _.. ..... _.__ .." wrote in message news:7uAdi.1520$AR5.1490@trnddc06... "Jeff Dieterle" wrote in message ... I'm installing a 60ft tower about 400ft from my house for uhf/vhf. I'm planning to use a Channel Master rotor which I haven't purchased yet. I've buried 1"pvc conduit to tower and planning the wire pull for the antenna & satellite coax plus the rotor cable. From my research 3c/22ga. wire will control all C M rotors. Since I don't know the power requirements yet of the un-purchased rotor I can't calculate the voltage drop on appx. 500ft of 22 ga wire to see if it will be sufficient. Can somebody either reply with the typical C M rotor current/voltage/watts or first hand knowledge of the correct wire gauge for a 500ft run. Thanks Jeff Hi, Jeff - I could find only one rotator on the Channel Master Web site. The manual for it is http://www.pctinternational.com/chan...al_9521_37.pdf and page 1 tells required wire size vs length. Looks like you need 18ga. Cheers, John KD5YI |
#10
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rotor cable voltage drop
On Mon, 18 Jun 2007 07:25:26 -0500, Jeff Dieterle wrote:
I'm installing a 60ft tower about 400ft from my house for uhf/vhf. I'm planning to use a Channel Master rotor which I haven't purchased yet. I've buried 1"pvc conduit to tower and planning the wire pull for the antenna & satellite coax plus the rotor cable. From my research 3c/22ga. wire will control all C M rotors. Since I don't know the power requirements yet of the un-purchased rotor I can't calculate the voltage drop on appx. 500ft of 22 ga wire to see if it will be sufficient. Can somebody either reply with the typical C M rotor current/voltage/watts or first hand knowledge of the correct wire gauge for a 500ft run. Thanks Jeff -- Marvin L Jones | jonz | W3DHJ | linux 38.24N 104.55W | @ config.com | Jonesy | OS/2 *** Killfiling google posts: http://jonz.net/ng.htm |
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