|[AMRadio] open wire line|
lhwill at verizon.net
Tue Nov 20 10:30:59 EST 2007
Someone earlier in this thread indicated he didn't like open wire
line. My W7FG line here to a 274 ft center fed doublet at about 55
ft has been up at least 7 years, Only maintenance is occasionally
I'll break a connection at the horizontal to vertical transition, I
have the tensions now so that hasn't happened in the last 2 years or
so. The balanced open wire line minimizes ground losses directly
under the line but doesn't completely eliminate them.
My Johnson KW matchbox loads all bands FB except for 60 meters where
it is between coil taps.
If you think open wire line doesn't work, my Asst CE in Pittsburgh
many years ago at his wife's parents house in SW PA had their TV
antenna on a hill 1 mile from their valley house. They used open
wire line on poles high enough so their farm equipment could drive
under it. A preamp at the antenna fed the line which also carried
the DC from the power supply behind the set. The spacing was about
3-4" as I remember and they had good signals from ch 2-13 (54 to 216
mcs) at the house. Its the lowest loss method and they didn't worry
(or even know) what the VSWR was. I might actually have some pixes
of that installation if I could ever find them.
At 08:31 PM 11/19/2007, you wrote:
>Regarding home made spacers.
>If you run the feed wire on the outside of the spacer and the tie
>wire through the hole it will be be much easier to replace a damaged spacer.
>----- Original Message ----- From: "Robert Nickels" <w9ran at oneradio.net>
>To: "Discussion of AM Radio in the Amateur Service" <amradio at mailman.qth.net>
>Sent: Monday, November 19, 2007 8:27 PM
>Subject: Re: [AMRadio] open wire line
>>Jim Wilhite wrote:
>>>As for spreaders, use the lightest thing you can find, 1/8
>>>plexiglass cut into strips 1/2 inch wide, Lexan the same or
>>>anything. To keep the spreader in place, drill holes in the
>>>strips then run the wire through the holes then cut short pieces
>>>of wire and wrap one side of the spreader then across it to the
>>>other side and wrap, then solder.
>>Here's another idea, FWIW. W7FG makes dipoles out of 16 ga.
>>stranded wire and PVC pipe insulators and mine seems to be holding
>>up well after a couple of years. Gary's got some pretty good
>>pictures here: http://www.w7fg.net/ladder/ladder.html He makes
>>a V-shaped entrance to a round hole through the pipe that secures
>>the wire. The wire snaps-in place, and stays put under all weather
>>conditions, yet can be moved or adjusted as needed.
>>73 Bob W9RAN
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