[Antennas] More Questions on Multiband Antennas

Wed Sep 15 06:27:59 EDT 2004

 There is a correctoin to my first post I should have read G5RV was not
trying to origanilly trying to build an All band antenna.
73 Dave 

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

From: Pastor-kc1di
Date: 09/15/04 05:44:49
To: antennas at mailman.qth.net; k7rx at comcast.net
Subject: Re: [Antennas] More Questions on Multiband Antennas

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