[Antennas] Information Please?

Tue, 11 Mar 2003 21:10:08 -0600

Believe you would be much happier in the long run with a tuner made for
balanced "tuned" feeders, especially if you intended to operate several
bands with the same antenna.   A  9:1 balun (in my opinion) not very
practical or efficient with the unknown input impedance values that would
be encountered on different bands.  
73, Mike, AC5P

On Tue, 11 Mar 2003 17:14:57 +0000 "Durwydd MacTara"
<[email protected]> writes:
> 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: Tue, 11 Mar 2003 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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