[TowerTalk] Yaesu G-2800 wiring long run

[David Gilbert]

TLW  gives these loss figures for 250 feet (190' plus 60' up the tower) 
of coax at 21 MHz (midpoint of James' tribander) with an SWR of 1.4:1.

RG-213   2.5 db
9913        1.4 db
LDF4-50A   0.7 db

I've seen LDF4-50A (1/2 inch Heliax) on eBay for around $1/ft less 
shipping (and there's an outfit that regularly offers it for $1.25 with 
free shipping).  Connectors can be expensive but patch cables with 
reusable N-connectors are not expensive ... neither are N-to-UHF adapters.

In my opinion, $100/db is tough to achieve anywhere else in the system 
(other than maybe for a used linear amp).

73,
Dave   AB7E



Jim Brown wrote:
> On Sun, 19 Aug 2007 14:49:31 -0400, James M. Daly wrote:
>
>   
>> And on a side note; is there any significant advantage to using 9913 coax
>> over RG-213 at these lengths when operating at 10-20m frequencies?
>>     
>
> The best answer to that is to plug some feedpoint impedances (or SWR) values 
> across the bands into the TLW software that comes with the antenna book and 
> let it crunch the numbers. I just did that for the 150 ft long feed to an 
> 80/40 dipole and plugged the result into a spreadsheet to study it. The math 
> told me that the difference between Belden RG6 with a steel center and 8213 
> (RG11 all copper) was about 0.6 dB averaged over 80 and 40, taking SWR into 
> account). LMR400 might have given me another tenth dB or so. The decision was 
> made easy for me when I found a surplus spool of 8213 for about $.30/ft. :)
>
> 73,
>
> Jim K9YC
>
>
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