[Elecraft] OT: Balanced Feedlines

[David Y.]

I've been using 300 ohm stuff from the Wireman for several years now.  I 
bought a 500 ft. roll of it, and have never regretted it.  It has small 
"windows", like 450 ohm line does, so it doesn't act like a sail when it's 
in the air.  I believe the difference in loss is negligible compared to 450 
ohm line, and it is so much easier to work with.  FWIW, I recommend it.

Dave W7AQK


----- Original Message ----- 
From: "list1" <list1 at pituch.net>
To: <elecraft at mailman.qth.net>
Sent: Thursday, July 16, 2009 6:09 PM
Subject: Re: [Elecraft] OT: Balanced Feedlines


> Hi Don and All,
>
> I don't know if 300 Ohm ladder line is small enough for you, but at 20:1 
> SWR
> 100 feet of it loses about 1.1 dB total.  See the chart for 450 Ohm line 
> at
> the center of this page:
> http://tinyurl.com/m5rjww
>
> The loss for 100 feet of 450 Ohm line at 20:1 SWR is about .65 dB total. 
> I
> had calculated that the loss of 300 Ohm line in a similar situation is 
> about
> .5 dB worse.  The 300 Ohm is really hard to see when put up.  I used it 
> for
> Field Day, see:
> http://tinyurl.com/luwagy
>
> At the Wireman web site it describes its "562" 300 Ohm ladder line as 
> being
> able to take full power.
> "300 ohm, 18 AWG, 19 strand copper-clad steel conductors, poly-clad 
> 'window'
> for full power VF .91"
>
> The Wireman is at:
> http://tinyurl.com/mdkvtm
>
>
> 73,
> Steve, W2MY, AAR6CX
>
>
> -----Original Message-----
> Behalf Of Don Rasmussen
> Subject: [Elecraft] OT: Balanced Feedlines
>
> Can anyone suggest a compact balanced line that can handle 1000 watts? I
> like the size of that Radio Shack 300 ohm TV line, but 100 watts is likely
> the maximum. I'd like to build a stealthy KW antenna. The 20m dipole
> radiating elements are so low to the ground that 3:1 SWR is the best I can
> get. If I tune this out with a tuner, there will be too many db's of loss
> over the 100 feet of feed required. I assume a KW would melt the TV line.
> Any suggestions? Don...
>
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