Fw: Fw: Re: [Antennas] 450 Ohm Ladder Line

Wed, 11 Dec 2002 12:35:29 -0600

On the other hand...........

* Ladder line tests were performed at 50MHz to 150Mhz (instrumentation 
   limitation) where losses are greater  .....not at HF, 160m - 10m
* Many of the tests were performed with Wireman Type 554 ....should 
   also use the larger AWG.
* The premise is that you are trying to load random length dipoles due to
   space limitations .....the antennas I feed are "tuned dipoles".
* Wet measurements are made by wetting the line, including an open wire
   "reference line" which had NO change (indicates that a high moisture 
   "mist" dielectric was not considered) .....this also implies that the
change
   in impedance and attenuation shown is due to a wet ladder web only. 
   Making the web smaller should help this.

I'd also like to know, for a HF antenna system, do you get more power 
radiated by the resonant antenna if 1) you have an impedance mismatch 
of  9:1 (with it's resultant SWR) between 200ft of 450ohm transmission 
line and the 50ohm antenna .....or 2) if you use a toroidial 9:1
transformer 
(with it's loss) between the balanced transmission line and the balanced 
antenna ?

Fun stuff.

73  Kees K5BCQ   

--------- Forwarded message ----------
From: Sandy and Kees Talen <[email protected]>
To: [email protected]
Date: Wed, 11 Dec 2002 11:06:33 -0600
Subject: Fw: Re: [Antennas] 450 Ohm Ladder Line

Great article, thanks Dan. It's always good to see real data, determined
using a controlled experiment, and excellent test equipment.

73  Kees K5BCQ

------- Forwarded message ----------
From: Dan Richardson <[email protected]>
To: [email protected]
Date: Wed, 11 Dec 2002 08:24:01 -0800
Subject: Re: [Antennas] 450 Ohm Ladder Line
Message-ID: <[email protected]>

For those interested here is URL which provides a very through analysis
on 
this subject.

http://users.triconet.org/wesandlinda/ladder_line.pdf

Danny, K6MHE

No trees were destroyed in the sending of this message.
However, a large number of electrons were terribly inconvenienced.

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