| Author |
Message |
    
Stepchild
| | Posted on Monday, March 10, 2003 - 1:27 pm: | 
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Anybody know anything about a CDR Ham-M series 5 rotor?Wind load rating?And locking capability?Need it for a moonraker 4.Thanks Stepchild |
Bigbob
| | Posted on Monday, March 10, 2003 - 8:43 pm: |
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All I know is BIG ROTOR,small antenna,should be adequate,friend uses tv rotor with thrust bearing on his mr4,I think it's more along the lines of the mr6. |
Crafter
| | Posted on Monday, March 10, 2003 - 9:53 pm: |
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As long as its a bell type mounted inside the tower they all rate at least 4 square feet. I used a 5 wire ar40 and a 8 wire cd45 with a brake.
the 4 wire and 5 wire dont have a brake but hold well none the less. |
2600
| | Posted on Monday, March 10, 2003 - 11:04 pm: |
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It's the smallest of the "Ham" series rotators. Has a brake, requires the 8-wire control cable. The two wires for the brake are supposed to be a larger gauge than the other six. Mine has been turning a FrostBite Stinger-4, roughly the same size and wind load as a MR-4 for over five years, knock on wood. The thrust bearing is a real must, as far as I'm concerned. It's just cheaper than the cost of fooling with rotator wear down the road.
73 |
Jp1116
| | Posted on Tuesday, March 11, 2003 - 8:50 am: |
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The Ham M is the same rotor as a Ham II, the Ham II just used a new control box. I looked in the Ham M manual and there were no specs as far as wind load. It just states that it is for heavy antennas with relatively high wind resistance, including multi-band arrays having traps at the extreme of the elements.
I have the Ham II manual at home if you would like me to try and find a number for you. Sounds like you would be okay though.
The thrust bearing is a great idea. Most older rotors I rebuild have bearing imprints in a portion of the race. |
Stepchild
| | Posted on Tuesday, March 11, 2003 - 12:05 pm: |
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Thanks guy's,I agree a thrust bearing is the only why to go.I found this rotor on ebay along with a few more.They sold a Ham 4 w/controler and cable for 250.00.Thanks again,Stepchild |
Bigbob
| | Posted on Tuesday, March 11, 2003 - 8:05 pm: |
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I took my ar33 apart 5 years ago and put all-weather synthetic wheel bearing grease on the races.This stuff stays greasy down to -70 and resists drying up to 350,cool huh.Helps to have an extensive background in the automotive field,he he. |
applejack
| | Posted on Tuesday, April 15, 2003 - 10:43 pm: |
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hey ive got an ar40 turning my a99 with no thrust bearing, works good. |
Dx431
| | Posted on Tuesday, April 15, 2003 - 11:36 pm: |
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Um, ok. I'll bite. What is the purpose of a rotor on an omni directional ant?????
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Crafter
| | Posted on Wednesday, April 16, 2003 - 2:15 pm: |
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LOL.. |
Skilletlicker
| | Posted on Wednesday, April 16, 2003 - 2:32 pm: |
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could any one tell me the purpose of ferrite beads
i seem to recall in another post that they were used to remove r f problems |
Alsworld
| | Posted on Wednesday, April 16, 2003 - 9:17 pm: |
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Skilletlicker,
here is somewhat of an answer of ferrite beads. In a perfect world, your signal would transmit through the center conductor of your coax, and the outside shielding (braid) would keep all the signal inside, while keeping all other outside RF energy out.
Well, that doesn't always happen. So, by adding ferrite beads on the coax, whatever bad signals traveling on the braid (which it's not supposed to do), it basically chokes those out and stops it. Ferrite beads can also be effective in eliminating incoming noise not only on coax, but other byproducts that absorb our signals (around your stereo speaker wires, computer speaker wires, etc.) That is a basic overview. Did it help? Other comments? I know this is far from conclusive.
Alsworld |
anonymous
| | Posted on Wednesday, April 16, 2003 - 9:32 pm: |
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SkilletLicker,
They are used to form an inductor that helps prevent RF induced currents from flowing in a wire. For example you might see a ferrite bead on a coax cable at the feedpoint of an antenna to prevent induced current in the coax shielding.
Hope that helps you. |
applejack
| | Posted on Wednesday, April 16, 2003 - 9:35 pm: |
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the purpose of the rotor is i took down my beam and put up a tv antenna and then an antron over the tv antenna. the last post was just for giggles. |
Dx431
| | Posted on Thursday, April 17, 2003 - 1:25 am: |
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Applejack,I kinda figured that. hahaha  |
Skilletlicker
| | Posted on Thursday, April 17, 2003 - 6:29 am: |
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thanks to all who replied to my post on ferrite beads,i have a better understanding now of the
reason for them thanks skilletlicker |
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