TopBand: Slinky Beverages

[km1h @ juno.com]

On Fri, 1 Aug 1997 09:24:36 +0000 w8jitom@postoffice.worldnet.att.net
writes:
>Hi Carl,
>
>I won't repeat your tirade.

I dont consider it a tirade; just total frustation with ongoing
distortions, omissions and the like. This is a technical forum, not a
lawyers convention. 


>The surge impedance of a conductor is greatly affected by distributed 
>inductance and capacitance. Impedance is governed by the surge 
>impedance of the structure, not by the fact we "call it" a Beverage. 
>Winding wire in a mutually coupled string of "coils" increases L much 
>more than C. We use that effect for phase delay lines, as well as to 
>wind inductors.


So what does that have to do with anything?  That is just textbook stuff
and contributes nothing to the discussion for anyone with a modicum of
technical understanding. I would prefer information that is not aimed at
dumbing down the readership here. 

.
>You seem to disagree, but directivity of a traveling wave antenna is 
>GREATLY affected by PHYSICAL length. It is possible to get good 
>directivity in short antennas, but phase delay and current 
>distribution along the wire needs to be correct. (Any antenna, 
>however, is always better than no antenna at all.)


Pure Tom style distortion of what I said.  I have made no claim
whatsoever of pattern, impedence or any other electrical term that you
can conjure up. 
I have repeatedly asked one and all for feedback so that we can all
understand.
My ONLY claim is that the Slinky Beverage (for the want of a better name)
works well in a limited space and appears to offer a better S/N ratio
than a 1 wave long wire version. That is MY observation here, no science
involved....just QSL cards. I do not have the space to install 1000' +
versions to compare; and anyway I am reasonably sure the 1000' +  ones
would be superior. 

Last season a university EE Professor with a PhD attempted to explain the
theory and differentiate between a traveling wave and a slow wave
structure. After one demeaning reply from you he gave up. 

If you would care to talk to people, not down, a lot of the tension would
be gone for good here and on other reflectors you visit.  I would even
promise to contain my sarcasm at least 98% of the time. 


>If you send me a Slinky Beverage, and the typical dimensions you 
>suggest, I'd be happy to measure the surge impedance and 
>propagation delay along the wire.

You are quite welcome to join in and purchase 5 of them Tom. The
dimensions I use have been published here repeatedly  AND  for the
umpteenth time, the dimensions I use are completely arbitrary  and were
selected to fit my property.  No mumbo jumbo on this end. 
I would hope to believe that a true engineer would want to vary both the
number of individual Slinkys and the overall lengths as part of his
tests. Then publish the findings for peer review. Maybe I am confused
here; I consider an engineer and researcher to be one and the same. 

>
>If have personal comments, please reply by e-mail or in person.

Does that sound like an invitation for a grudge match at the drag races ?
What class are you running in these days?

73....Carl   KM1H




>73, Tom W8JI 
>
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