[Antennas] Twin lead 450 Ohm

Wed, 11 Dec 2002 03:49:33 -0600

I have run 1.5" spacing ladder line thru my basement cinderblock
wall inside 2" pvc pipe, a couple of wood slats kept the ladder line
centered, and I used paper towels to stuff the ends up, and it
worked fine.

wd8aam

At 09:05 PM 12/10/2002 -0600, Mike J Maloney wrote:
>A very good question, one which I would bet very darn few(if any) have
>actually tested.  This came up some months ago in a side thread about
>running ladder line into the shack.   Most said any buried ladder line
>would have great loss.  I dont see really why it should unless the pipe
>should become full of water which could be quite likely if care was not
>taken to prevent it.    It would make for a good experiment, but before I
>went to 10 inch PVC with the line centered, I would try 2 inch centered
>and non-centered and work up to 4 and 6 inch to see if any detectable
>difference between this and loss in air.    Even in 2 inch PVC it would
>seem to me that most of the dielectric between and surrounding the
>conductors would still be air and plastic?   If the dielectric of the
>buried line in PVC is changed, it should be quickly detectable as a
>change in the electrical length at a given frequency as compared to being
>in open air.   This is my speculation  on the subject.   It would be my
>thought that the most difficult part of making this practical would be
>keeping the inside of the PVC full of air or even better DRY air.   What
>lower loss coaxial line is there than one with dry gas such as nitrogen
>under positive pressure being most of  the dielectric?   I cant see why
>coax of this type would  be much  different in attenuation or losses than
>that of open wire line, perhaps even better? 
>73, Mike ac5p
>
>On Tue, 10 Dec 2002 07:15:38 -0800 (PST) Honest Charlie's Used Cars
><[email protected]> writes:
>> Opinions Please...If 450 later line was suspended in
>> the center of a ten" PVC pipe and buried would it have
>> the properties of one suspended in Air?
>> 
>> =====
>> 
>> When I was a kid I was so naive, I would go 
>> behind the barn and do nothing.
>> 
>> 
>>  
>> 
>> Twas a woman who drove me to drink, and I 
>> never had the courtesy to thank her for it. 
>> W. C. Fields ( 1880 - 1946 )
>> 
>> 
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