[Antennas] Twin lead 450 Ohm
Pastor-kc1di
[email protected]
2002年12月11日 09:22:27 -0500 (Eastern Standard Time)
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Many years ago In my novice days... =0D
A friend and I shared an antenna, 40 Meter dipole fed with 450 ohm open w=
ire
Line.. we buried my line underground in 8" sewer pipe.. PVC Green Stuff t=
hat
seals at each joint.. the hard part was to pull the open wire.. (it was r=
eal
open wire not ladder line) and keep it in the center of the pipe.. but as=
I
remember it worked quite well. How ever I must emphasize that I had noth=
ing
else to compare it to at the time.. It got me on the air and that's all I
cared about.. 73 Dave Kc1di P.S. Been thinking of doing something simlar
here too.=0D
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-------Original Message-------=0D
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From: Jim Sutton=0D
Date: Wednesday, December 11, 2002 9:03:48 AM=0D
To: Mike J Maloney; [email protected]; van lincoln wd8aam=0D
Cc: [email protected]=0D
Subject: Re: [Antennas] Twin lead 450 Ohm=0D
=0D
In reply to ladder line in a pvc pipe - I ran my line in a 2 inch pvc pip=
e=0D
about 50 feet in my basement - through the wall of the house and then abo=
ut=0D
25 feet underground to a center support for a triangular antenna. The=0D
horizontal portion was about 8 feet off the ground and the top point abou=
t=0D
25 feet in the air. I loaded the horizontal portion a bit and was able to=
=0D
operate over the top portion of 80 meters and on up in frequency.=0D
=0D
How much loss did I have -- don't know but all worked fine.=0D
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73/Jim/AC4CZ=0D
----- Original Message -----=0D
From: "van lincoln wd8aam" <[email protected]>=0D
To: "Mike J Maloney" <[email protected]>; <[email protected]>=0D
Cc: <[email protected]>=0D
Sent: Wednesday, December 11, 2002 1:49 AM=0D
Subject: Re: [Antennas] Twin lead 450 Ohm=0D
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=0D
> I have run 1.5" spacing ladder line thru my basement cinderblock=0D
> wall inside 2" pvc pipe, a couple of wood slats kept the ladder line=0D
> centered, and I used paper towels to stuff the ends up, and it=0D
> worked fine.=0D
>=0D
> wd8aam=0D
>=0D
> At 09:05 PM 12/10/2002 -0600, Mike J Maloney wrote:=0D
> >A very good question, one which I would bet very darn few(if any) have=
=0D
> >actually tested. This came up some months ago in a side thread about=0D
> >running ladder line into the shack. Most said any buried ladder line=0D
> >would have great loss. I dont see really why it should unless the pipe=
=0D
> >should become full of water which could be quite likely if care was no=
t=0D
> >taken to prevent it. It would make for a good experiment, but before I=
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> >went to 10 inch PVC with the line centered, I would try 2 inch centere=
d=0D
> >and non-centered and work up to 4 and 6 inch to see if any detectable=0D
> >difference between this and loss in air. Even in 2 inch PVC it would=0D
> >seem to me that most of the dielectric between and surrounding the=0D
> >conductors would still be air and plastic? If the dielectric of the=0D
> >buried line in PVC is changed, it should be quickly detectable as a=0D
> >change in the electrical length at a given frequency as compared to be=
ing=0D
> >in open air. This is my speculation on the subject. It would be my=0D
> >thought that the most difficult part of making this practical would be=
=0D
> >keeping the inside of the PVC full of air or even better DRY air. What=
=0D
> >lower loss coaxial line is there than one with dry gas such as nitroge=
n=0D
> >under positive pressure being most of the dielectric? I cant see why=0D
> >coax of this type would be much different in attenuation or losses tha=
n=0D
> >that of open wire line, perhaps even better?=0D
> >73, Mike ac5p=0D
> >=0D
> >On 2002年12月10日 07:15:38 -0800 (PST) Honest Charlie's Used Cars=0D
> ><[email protected]> writes:=0D
> >> Opinions Please...If 450 later line was suspended in=0D
> >> the center of a ten" PVC pipe and buried would it have=0D
> >> the properties of one suspended in Air?=0D
> >>=0D
> >> =3D=3D=3D=3D=3D=0D
> >>=0D
> >> When I was a kid I was so naive, I would go=0D
> >> behind the barn and do nothing.=0D
> >>=0D
> >>=0D
> >>=0D
> >>=0D
> >> Twas a woman who drove me to drink, and I=0D
> >> never had the courtesy to thank her for it.=0D
> >> W. C. Fields ( 1880 - 1946 )=0D
> >>=0D
> >>=0D
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