80m+40m dipole
 

I'm presently running a ladder-line fed dipole antenna
system that is resonant on both 3.85 MHz and 7.15 MHz
at the same time. It is described at the URL below.
--
73, Cecil http://www.w5dxp.com/HEDZ.htm

80m+40m dipole
 

Cecil Moore wrote in news:_SYDh.1457$MV7.1433
@newssvr23.news.prodigy.net:

http://www.w5dxp.com/HEDZ.htm

Cecil,

An interesting and practical solution to a 2 band antenna for 80 and 40.

Some constructive comments:

I question to derivation of the name "Half-Extended Double Zepp (HEDZ)
Antenna", the length of the radiator of itself has no special properties,
no special pattern characteristics. I think you could develop a more
descriptive name for the antenna system (because that is what you are
describing), brand it even with your callsign to differentiate it.

The first paragraph seems to use the term "antenna" to mean the radiator.
The article later talks about "resonance" of the "antenna" and seems to
mean a purely resistive load looking into the feedline, so "antenna" here
seems to mean dipole + feedline + balun. Perhaps you should refer to
dipole + feedline + balun as the "antenna system" to differentiate the
two.

Though you discussed the gain of a number of other antennas (are they
relevant?), and you show pattern details for 80 and 40 (good), did you
discuss the gain and pattern of this antenna on all the other bands that
you propose in the last paragraph.

Adding some headings to the layout would help readabilty.

Well done, interesting solution to the challenge of an 80/40 dipole (if
one has the space for a 50m long dipole on a suburban block).

Owen

80m+40m dipole
 

Owen Duffy wrote:
I question to derivation of the name "Half-Extended Double Zepp (HEDZ)
Antenna", the length of the radiator of itself has no special properties,
no special pattern characteristics.

Since the length is half-way between a Double Zepp and an
Extended Double Zepp, it seems that "Half-Extended" is an
appropriate identifier.

The first paragraph seems to use the term "antenna" to mean the radiator.
The article later talks about "resonance" of the "antenna" and seems to
mean a purely resistive load looking into the feedline, so "antenna" here
seems to mean dipole + feedline + balun. Perhaps you should refer to
dipole + feedline + balun as the "antenna system" to differentiate the
two.

If I didn't talk about the "antenna system", it was an oversight.
I will attempt to edit out any confusion.

Though you discussed the gain of a number of other antennas (are they
relevant?), and you show pattern details for 80 and 40 (good), did you
discuss the gain and pattern of this antenna on all the other bands that
you propose in the last paragraph.

As you know, above the EDZ frequency, the pattern becomes multi-
lobbed, sometimes called a "cloverleaf" pattern. Everything above
14 MHz is multi-lobbed with a gain of 10-11 dBi with low TOAs.
I will publish the radiation patterns as time permits.

Well done, interesting solution to the challenge of an 80/40 dipole (if
one has the space for a 50m long dipole on a suburban block).

Moral: Don't live in suburbia. :-) I just bought a house in Tyler, TX.
I rejected a dozen locations because of not enough room for antennas. I
also educated the Tyler City Council on the Texas/FCC rules for Amateur
Radio Antennas.
--
73, Cecil http://www.w5dxp.com