[TowerTalk] upgrading from a G5RV

[K4SAV]

A quick check with EZNEC shows the following loss in the 30 feet of 
RG213.  The antenna was placed at 40 feet.

3.5 MHz    2.17 dB
7 MHz       1.95 dB
10.1 MHz  4.42 dB
14 MHz     6.5 dB
18.1 MHz  2.28 dB
21 MHz      3.1 dB
24.9 MHz   4.35 dB
28 MHz      3.12 dB


I didn't try to find a better solution, but different lengths of 450 ohm 
line will produce a different set of answers and some lengths will 
probably produce a set of numbers that is better than the one above.

Jerry, K4SAV

KI9A at aol.com wrote:

>Gang-
> 
>After some serious tree trimming, I now have room to fit a full sized wire  
>antenna where my G5RV is right now. I am thinking about a 135' open wire fed  
>dipole, as multi bands are needed. 
> 
>Question is this- there is now way I can get 450 ohm feedline into the  
>shack.  The best I can do is about 30' of RG213, then the rest 450 ohm (  maybe 
>90').  Is this going to be a waste of my time, or is it worth it? I'd  obviously 
>use a balun to change over to 50 ohm feedline.
> 
>73- Chuck KI9A
>
>
>  
>