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#1
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600 ohm ladder insulators
I'm installing a temporary V antenna with a 600 ohm ladder feed about
50 ft in length. Anybody have experience using 6" wood dowels as separators? What happens when it rains? |
#2
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Just a thought - but if its temporary, why bother making up ladder line ?
I would be stringing up some tv twinlead "Alex AG0Z" wrote in message oups.com... I'm installing a temporary V antenna with a 600 ohm ladder feed about 50 ft in length. Anybody have experience using 6" wood dowels as separators? What happens when it rains? |
#3
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Way back years ago, back when men were men, when DOS was unheard of, and AM
was king, the thing to do was to get a big ol' slab of paraffin and a double boiler. Melt the paraffin in the double boiler and boil the wooden dowels in the paraffin. The dowels absorbed the wax and became (somewhat) waterproof after which they could be used as spacers. -- ----- Joe S. "Alex AG0Z" wrote in message oups.com... I'm installing a temporary V antenna with a 600 ohm ladder feed about 50 ft in length. Anybody have experience using 6" wood dowels as separators? What happens when it rains? |
#4
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Joe S. wrote: Way back years ago, back when men were men, when DOS was unheard of, and AM was king, the thing to do was to get a big ol' slab of paraffin and a double boiler. Melt the paraffin in the double boiler and boil the wooden dowels in the paraffin. The dowels absorbed the wax and became (somewhat) waterproof after which they could be used as spacers. You beat me to it. Right out of my 1955 ARRL Handbook . . ----- Joe S. w3rv "Alex AG0Z" wrote in message oups.com... I'm installing a temporary V antenna with a 600 ohm ladder feed about 50 ft in length. Anybody have experience using 6" wood dowels as separators? What happens when it rains? |
#5
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"Hal Rosser" wrote in message ... Just a thought - but if its temporary, why bother making up ladder line ? I would be stringing up some tv twinlead "Alex AG0Z" wrote in message oups.com... I'm installing a temporary V antenna with a 600 ohm ladder feed about 50 ft in length. Anybody have experience using 6" wood dowels as separators? What happens when it rains? If you intend using the antenna on frequencies where its length is less than a quarter wave; the losses on 300 TV twin lead can be very high. Also you will likely exceed the breakdown voltage of the TV twinlead. On 7MHz, and above, the TV twin lead will be acceptable. Frank VE6CB Calgary, AB. |
#6
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See http://eznec.com/Amateur/Articles/Po...Feed_Lines.pdf for some
information on using TV twinlead at HF. Roy Lewallen, W7EL Frank wrote: "Hal Rosser" wrote in message ... Just a thought - but if its temporary, why bother making up ladder line ? I would be stringing up some tv twinlead "Alex AG0Z" wrote in message groups.com... I'm installing a temporary V antenna with a 600 ohm ladder feed about 50 ft in length. Anybody have experience using 6" wood dowels as separators? What happens when it rains? If you intend using the antenna on frequencies where its length is less than a quarter wave; the losses on 300 TV twin lead can be very high. Also you will likely exceed the breakdown voltage of the TV twinlead. On 7MHz, and above, the TV twin lead will be acceptable. Frank VE6CB Calgary, AB. |
#7
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that would work with my present wife - but not with the ex :-)
momma would hit me on the head for messen' up a good pot. now she'll have to use it - in her canning endeavors. Drilling the holes in the dowels first helped also "Joe S." wrote in message ... Way back years ago, back when men were men, when DOS was unheard of, and AM was king, the thing to do was to get a big ol' slab of paraffin and a double boiler. Melt the paraffin in the double boiler and boil the wooden dowels in the paraffin. The dowels absorbed the wax and became (somewhat) waterproof after which they could be used as spacers. |
#8
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Alex:
If you use insulated wire to make up the ladder line, it doesn't matter quite as much if the wood dowels conduct a little when wet... On the other hand, why not use 1/2" drip line tubing? It's easy to cut, not too bad to drill, and if you cut little v-shaped notches to the drill holes (or punch them) you can just "snap in" the wire. There's a fellow that sells ladder line made this way (insulated wire snapped into dripline tubing spreaders) and it works great. He also sells G5RV antennas so a search on G5RV may net you the guy... (Don't remember at the moment, and am in the middle of an endless move from a large house to a small rental while we build the new QTH. Not fun, and my time is extremely limited for the next week or so at least...) Thanks --Rick AH7H Alex AG0Z wrote: I'm installing a temporary V antenna with a 600 ohm ladder feed about 50 ft in length. Anybody have experience using 6" wood dowels as separators? What happens when it rains? |
#9
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My Grandfather was a general contractor, I can still remember, in his
basement, a two gallon compression lid can. It contained wooden dowels soaking in what he called "Teak Varnish." Some of these dowels had become so "water logged" with the varnish they sank.... These he used on transmission lines as insulators... I suspect holy wars could be fought over these insulators--I think his choice just pertained to his profession... Warmest regards, John "Alex AG0Z" wrote in message oups.com... | I'm installing a temporary V antenna with a 600 ohm ladder feed about | 50 ft in length. Anybody have experience using 6" wood dowels as | separators? What happens when it rains? | |
#10
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What happens when it rains?
well things get wet mostly use 1/2 hose braided water hose cut into lengths with a hole drilled in each end like the wood dowels but waterproof |
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