[Antennas] Information Please?
Durwydd MacTara
[email protected]
2003年3月11日 17:14:57 +0000
Dan,
Thanks for the reply! A little background might be in order here:
I built a double extended zep for 80-10 out of 450 ladder line and "foled"
it by shorting the ends of the arms leaving the lower wire open at the
center. I drooped the final 20 ft of each arm and achieved significantly
lower radiation angles and better DX! However the rainy climate here causes
real problems with the ladder line. I have solved this by constructing open
wire feeder to replace the ladder line. Since
I will be constructing a balun for this setup, I figured that it was just as
easy to go for a 9:1 "match" as the 4:1 "isolation." I am using a Kenwood
830 modified for QRP and want to eventually get a 5B WAS on 5 watts or less!
I alked to somebody with this antenna setup and they felt the small
improvement in the 9:1 vs 4:1 wasnt worth the expense. I disagree, since
"real dx begins at the noise floor, ANY improvement is worthwhile! HI HI
Any and all comments are welcome!
"Communications" is a People skill, the rest is technology.
Durwydd MacTara
>From: Dan Richardson <[email protected]>
>To: "Durwydd MacTara" <[email protected]>
>Subject: Re: [Antennas] Information Please?
>Date: 2003年3月11日 06:53:00 -0800
>>At 10:10 AM 3/11/2003 +0000, you wrote:
>>I need to construct a 9:1 Balun and dont know how! I need to match the
>>RG-213 from my shack and tuner to a 450 ohm Balanced load. Where can I
>>learn? Where do I find parts?
>>>> "Communications" is a People skill, the rest is technology.
>> Durwydd MacTara
>>Are you planing this for feeding a tuned fed dipole or do you truly have a
>450-Ohm balance load? My reason for asking is that if it is the former then
>you wouldn't be gaining anything be using a 9:1 balun. (I would be glad to
>explain if you wish)
>>That said you can find the best information in Jerry Sevick's (W2FMI) book
>on baluns. My copy is titled "Transmission Line Transformers" and is a
>wealth of information. It can be obtain at Amazon.com.
>>73
>Danny, K6MHE
>
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