[Knightsqrss] [Fwd: Re: An Off topic response to use of the MicroVert antenna]

[Steinar Aanesland]

Hi Claudio

This was a very interesting version of  microvert dipole. I have to 
study it closer to see if I can figure out how it works .

73 de LA5VNA Steinar



i2NDT skrev:
>  Hi Steinar!
> You maybe would like to check also oe7okj (unfortunately SK) website 
> and in particular fig 6.1 at 
> http://members.tripod.com/~oe7okj/zeichnungen.htm 
> which is a sort 
> of triple microvert dipole! I would like DJ5IL to comment it!
>  
> Let me know...
>  
> Best 73 and Season's Greetings
> de
> i2NDT Claudio
>
> */Steinar Aanesland <saanes at broadpark.no>/* ha scritto:
>
>     Hi all,
>
>     Yes I know. This is off topic, but take the chance and hope that I am
>     not being flamed to bad.
>
>     How this MicroVert antenna is working has been a mysterious to me. I
>     have been playing with half-wave end-feeded vertical for a long time,
>     and my first thought was that this was a sort of an unbalances
>     half-wave dipole, or may be some kind of a top loaded vertical . But
>     Jürgen Schäfer, DL7PE's explanation of how this antenna works dos not
>     fit in with the conventional antenna theory I know.
>
>     I crawled the the World Wide Web up and down to find something ,
>     then I
>     stumble across this side:
>     http://members.aol.com/dj5il/mv.htm#englisch .
>     It is long and ugly, but worth a look. The conclusion is not so
>     nice to
>     the MicroVert :
>
>     " (..) these antennas are in reality no extremely short monopoles but
>     off-center fed asymmetrical dipoles which, with a length short of
>     l/4,
>     are still almost half as long as a conventional halfwave-dipole
>     (insofar
>     "MicroVert" is a real misnomer). And only because the coax-segment
>     contributes to radiation the efficiency is much higher than for an
>     extremely short monopole. Anyone who denies that fact abnegates in
>     the
>     figurative sense the 90 % of an iceberg that are under the water !"
>
>     You are a bunch of smart guys so what do you think about dj5il's
>     analyze
>     of the antenna ? Is it nonsense ? I am very interested in small
>     antenna
>     system so I would be very happy to know your opinion. If you don't
>     want
>     to spam the group , please send your answer directly to me.
>
>     73 de LA5VNA Steinar
>
>
>
>
>
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