Something looks pretty out of whack with those numbers. According to
TLW, you'd need an SWR around 150:1 to get 6.5 db loss from 30 feet of
RG-213 at 14 MHz.
Dave AB7E
K4SAV wrote:
> 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@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
>>
>>
>>
>>
>>
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