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"V" Dipole Antenna
"John Ferrell" wrote in message ... I'd never heard of a messenger rope. Sounds interesting. How is the messenger rope secured to the antenna line? WB8YKH More properly "messenger line". This seems to be a difficult item to search so I will attempt to an explanation... When two ships meet at sea and wish to transfer items from one ship to another (think mail, movies, etc.) they must keep a safe distance between them. The accepted procedure is to throw or otherwise launch a small rope or line from one to the other. Then a larger line is attached to the small line and pulled back to the originating ship. There may be several iterations of this until a line strong enough to carry the ultimate load is in place. The first line (and may be the interim lines) that were used to get the final line in place are refferred to as messenger lines. I sometimes use a weighted piece of fishing line as the meesenger and tie the string/rope/wire in place to hang an antenna. It saves a lot of snagging if you streamline the attaching knot with a bit of tape. If anyone manages to figure out a search that provides useful results for "messenger line" I would appreciate the enlightenment! John Ferrell W8CCW John while what you describe is correct, it is not the type of messanger rope, line, or cable that is being thought of. In the antenna case, it is a strong rope that is streached between two supports. To this rope is attached a lighter antenna. Say you only have some number 20 wire and want to make an 80 meter dipole. If you string the # 20 wire and attach some rg-8 type coax to the middle of it, it would probalby not stay up very long. Also you would have to have a large drop in the middle as you can not streachit very tight without breaking. If you have a strong rope you can tape and use some ultraviolet resistant wire ties to attach the antenna wire to the rope and then pull it up tighter. I have a tower up 60 feet with several beams on it. While it may not be the recommended practice, I came off the tower around the 40 foot level and ran the coax (4 coax +rotor cable) to the house about 50 feet away. I used a piece of guy wire and taped and ty wrapped the cable to the the guy wire. I pulled this guy wire tight enough to keep the cable off the ground. This particular guy wire is not one of the supporting guys, but just a 'messanger wire' to hold up the coax with out strssing the coax. |
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