[Antennas] WARNING re DCTL Antenna post.

Sun, 29 Feb 2004 08:00:55 -0600

WARNING!
The URL in this post has intrusive, loud music, with no mute button and no 
warning.. Idiots who do this should be made to listen to SSTV scans with no 
visuals and the volume high. Fortunately, my keyboard has a separate mute 
button, for quick response.

At 07:11 AM 2/28/2004 +0000, Durwydd MacTara wrote:

>Dear Bob,
>If the Antenna is resonant and constructed of 450 ohm line, then it should 
>have a load impedance of 450 ohms, right? I am feeding it with 450 ohm 
>line and then using a 9:1 balun to my 50 ohm transmitter. Or at least that 
>is what I want to do.  The original design at 
>http://www.n5nw.org/antennas.html is done with 300 ohm twinlead and a 6:1 
>"balun" I want to avoid the rather awkward 6:1 match in the one I build, 
>particularly since I dont want to use a tuner.
>
>450 ladder and 300 twinlead have very different Capacitance and velocity 
>factors, so I need to compensate in the construction. My question is HOW.
>
>Thanks for the response.
>
>  "Communications" is a People skill, the rest is technology.
>             Durwydd MacTara
>
>>From: "Robert Lay" <[email protected]>
>>To: "Durwydd MacTara" <[email protected]>
>>Subject: Re: [Antennas] DCTL Antenna Question
>>Date: Sat, 28 Feb 2004 01:15:44 -0500
>>
>>Dear Durwydd,
>>
>>You are placing entirely too much significance on the characteristic
>>impedance of the transmission line. As a consequence you are worrying about
>>matching a characteristic impedance to the 50 ohm transmitter.
>>
>>You are supposed to be matching the actual load to the 50 ohm transmitter -
>>isn't that right?
>>
>>Bob Lay (W9DMK), Dahlgren, VA
>>[email protected]
>>http://www.qsl.net/w9dmk
>
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Bill Aycock - W4BSG
Woodville, Alabama 