[Antennas] More Questions on Multiband Antennas

[Chris BONDE]

I agree with Dave on the 88ft all band antenna.  Go to Cebik's web page for many 
ideas.  He has done a lot of work on the 88ft, why etc.  However, I cannot make it 
work on all bands.  Tuner, tuner.  I had some expert help as well from this reflector 
to make it work.  It does very well on 40m, 10m but not 75 etc.

Made my own 600 line as well.

But more than likely it is the configuration that causes the tuner not to be able to 
tune certain parts of the band.

Chris opr VE7HCB

 Hi Again Kevin

Well the reason you got the loop recommendations is because to the way
you worded your question. you wanted an antenna that was high angle on
80 and low on the upper bands and the horizontal loop fills that
request very nicely. But to answer your question . 102 feet is not a
magic number other than it represents about the shortest antenna that
will operate very effectively on 80m.  Not that other lengths are bad
just that this one fit the bill for most people , plus it was
popularized by the late G5RV. His criteria were quite a bit different
than most people believe however he was not originally trying to build
an all band antenna and the 102ft length has some problems on bands
above 20meter when fed the with a matching stub and coax.  it is not a
good 30 Meter antenna either though i've used them on that band there
are much better antennas on that band.  Some claim that 88 feet is a
good compromise for an all band antenna- But you better have a good
tuner with that one also.  

It Really depends on what your trying to do.. and as many have found
out over the years it is difficult to find one single antenna that
will do what your asking for all bands.  If you must stay with the
inverted vee configuration you may want to try a trapped dipole. 
since it will do somewhat what you were asking in your original
question.  other than that or the loop you will find the antenna you
are currently are using is not a bad choice.  

73 Dave 

-------Original Message-------

From: k7rx at comcast.net
Date: 09/15/04 01:09:59
To: antennas at mailman.qth.net
Subject: [Antennas] More Questions on Multiband Antennas

Hello All,

When I asked my question concerning recommendations for multiband
antennas which I might use to replace my current inverted vee which is
60 feet per side and fed with window line, the only recommendations I
got back were for full wave loops. While this is ultimately my dream,
I don't have the real estate presently to put up one of these. So, I
am back to trapped or other types of antennas. To be honest, I'm not
finding much in terms of dipole antennas trapped for the WARC bands as
well.

In conducting research on the net, I keep seeing the figure of 102
feet pop up again and again. This, of course, is the length of the
classic G5RV and I have found at least two other references to
multiband dipoles for 80 and up with a length of 102 feet. Is there
something magical about this length? This may sound silly, but is
there a magical suggested length for the non resonant dipole for 80
and up? Is 102 feet this special length?

I would appreciate any thoughts any of you might share with me on this
question. Thanks very much and very 73.


Kevin :)
Amateur Radio: K7RX
Navy Marine Corps MARS: NNN0SHS




- - -

Your moderator for this list is:
Larry Wilson KE1HZ antennas-owner at mailman.qth.net
_______________________________________________
Antennas mailing list
Antennas at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/antennas

- - - 

Your moderator for this list is:
Larry Wilson KE1HZ antennas-owner at mailman.qth.net
_______________________________________________
Antennas mailing list
Antennas at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/antennas