Larger size HF antenna's
 

Hi,

I seek some help, advise or suggestions on HF antenna's. I've bought a
house with a plot of approx 330 x 80 ft / 100 x 23 mtr available for HF
antenna's.
But when I research HAM HF antenna's, home build or commercially
available, I only find a lot of small, smaller and smallest HF
antenna's (eg. wire antenna's, inverted V, T2DF) that don't take full
advantage of the size of my land available. On the other end of the
spectrum there are plans for very, VERY large antenna's like Rhombic
and Beverage. For this size of antenna's my plot is to small.

Do you have suggestions for HF antenna's I should check out? Let me
know in this forum or pm me. Thanx in advance. 73

Maarten
maartenkoning2002 (at) yahoo.com

Larger size HF antenna's
 

Maarten wrote:
Do you have suggestions for HF antenna's I should check out? Let me
know in this forum or pm me. Thanx in advance. 73

Here's information on a 130 ft. dipole, good for 80m-10m.
--
73, Cecil http://www.qsl.net/w5dxp/notuner.htm

Larger size HF antenna's
 

On 17 Jan 2006 15:14:16 -0800, "Maarten"
wrote:

Hi,

I seek some help, advise or suggestions on HF antenna's. I've bought a
house with a plot of approx 330 x 80 ft / 100 x 23 mtr available for HF
antenna's.
But when I research HAM HF antenna's, home build or commercially
available, I only find a lot of small, smaller and smallest HF
antenna's (eg. wire antenna's, inverted V, T2DF) that don't take full
advantage of the size of my land available. On the other end of the
spectrum there are plans for very, VERY large antenna's like Rhombic
and Beverage. For this size of antenna's my plot is to small.

Do you have suggestions for HF antenna's I should check out? Let me
know in this forum or pm me. Thanx in advance. 73

Marteen, the reason for the gap from small to very large antennas is
mainly that the longer ones are developments of long wires and need to
be several wavelengths long at the lowest operating frequency.

However, it sounds like you block is large enough to accomodate a half
wave dipole on 160m... it all depends on the bands that are of
interest to you. Similarly, you migh be able to accomodate an Extended
Double Zepp for 80m, depending on orientation requirements, or an
array of verticals. Don't forget that guyed structures consume space
for the back guys. The space might allow you to erect several towers /
antennas without them all being tightly coupled as is the case with
smaller blocks. Whilst you are working at how to fill the space now, I
am guessing that it won't be too long before the space won't seem
large enough!

Owen
Maarten
maartenkoning2002 (at) yahoo.com
--

Larger size HF antenna's
 

Owen Duffy wrote:
Don't forget that guyed structures consume space for the back guys.

A friend of mine in AZ solved that problem like this.

+---------------Antenna wire-----
G |\
U | \
Y | \
| \ Pole
W | \
I | \
R | \
E | \
+--------+--------Ground---------
--
73, Cecil http://www.qsl.net/w5dxp

Larger size HF antenna's
 

Maarten,
How about a loop. Something like 320 x 120, or whatever
you can manage. Tuner and ladder line fed.
'Doc

Larger size HF antenna's
 

What exactly do you mean by an antenna that "takes advantage" of your
lot size? The main advantage of a larger antenna over a simple one is
higher gain. But you only get gain in one or a few directions, at the
expense of gain in other directions. So unless you can rotate the large
antenna, you'll have an antenna that works great in a very few
directions but typically much worse than a dipole in most others. Is
that what you want?

One of the few ways to get both gain and some control over pattern
direction is with a phased array of verticals, symmetrically constructed
so you can switch directions. Among the sources for information are
ON4UN's _Low-Band DXing_ and Chapter 8 of the _ARRL Antenna Book_.

Roy Lewallen, W7EL

Maarten wrote:
Hi,

I seek some help, advise or suggestions on HF antenna's. I've bought a
house with a plot of approx 330 x 80 ft / 100 x 23 mtr available for HF
antenna's.
But when I research HAM HF antenna's, home build or commercially
available, I only find a lot of small, smaller and smallest HF
antenna's (eg. wire antenna's, inverted V, T2DF) that don't take full
advantage of the size of my land available. On the other end of the
spectrum there are plans for very, VERY large antenna's like Rhombic
and Beverage. For this size of antenna's my plot is to small.

Do you have suggestions for HF antenna's I should check out? Let me
know in this forum or pm me. Thanx in advance. 73

Maarten
maartenkoning2002 (at) yahoo.com

Larger size HF antenna's
 

On Wed, 18 Jan 2006 00:06:04 GMT, Cecil Moore wrote:

Owen Duffy wrote:
Don't forget that guyed structures consume space for the back guys.

A friend of mine in AZ solved that problem like this.
....

Ok. I am assuming that there is 1 back guy and two front guys (not
shown). If you do the structural analysis, you will see why that
configuration is not common.

Owen
--

Larger size HF antenna's
 

Owen Duffy wrote:
Ok. I am assuming that there is 1 back guy and two front guys (not
shown). If you do the structural analysis, you will see why that
configuration is not common.

As I remember, my AZ friend had some sort of A-Frame support
about half-way down the pole. I don't recall more than one
guy wire at the top of the pole.
--
73, Cecil http://www.qsl.net/w5dxp

Larger size HF antenna's
 

Maarten wrote:
"Do you have suggestions for antennas I should check out?"

I am listening to Radio Marti and too jammers on the same frequency.
Cuba is the target. Who knows where the transmitters are? Marti is said
to be in Miami but that is not necessarily its transmitter location.
Likewise the jammers may be in Cuba or elsewhere. LocaL Jammers must be
much more numerous to cover the same territory for a large area, but
they are more effective. The band is 25 meters, about 12 MHz, a
year-round performer.

Monitoring Radio Marti in Houston with a small battery portable complete
with its telescopic antenna convinces me that a listener is better
served using horizonta polarization due to the nulls off the antenna
tips which reject interference. The antenna should also be rotatable for
maximum signal and, or, minimum interference.

A large antenna is usually impractical to rotate. Curtains and rhombics
can have high gain and directionality. You can erect enough of these to
cover all azimuths desired, then you don`t need to rotate any antennas.
So many antennas are usually not possible for the amateur.

For the radio amateur, an assortment of Yagis mounted on rotators can
cover all desired frequency bands and directions effectively and
efficiently.

Best regards, Richard Harrison, KB5WZI

Larger size HF antenna's
 

Tnx fer ur ideas OM's, I will surely check the books out.
I might choose a monopole conical antenna for broadband vertical
omnidirectional radiation (if I discover building plans somewhere) (if
you do'n know what a monopole conical antenna is, check out
http://www.antenna.be/vm.html )
I will keep researching this subject, so as before, all ideas and
suggestions are more than welcome.

73

Larger size HF antenna's
 

You'll find information on this kind of antenna in many publications.
It's commonly called a "discone".

Roy Lewallen, W7EL

Maarten wrote:
Tnx fer ur ideas OM's, I will surely check the books out.
I might choose a monopole conical antenna for broadband vertical
omnidirectional radiation (if I discover building plans somewhere) (if
you do'n know what a monopole conical antenna is, check out
http://www.antenna.be/vm.html )
I will keep researching this subject, so as before, all ideas and
suggestions are more than welcome.

73

Larger size HF antenna's
 

"Maarten" wrote in
oups.com:

Hi,

I seek some help, advise or suggestions on HF antenna's. I've bought a
house with a plot of approx 330 x 80 ft / 100 x 23 mtr available for HF
antenna's.
But when I research HAM HF antenna's, home build or commercially
available, I only find a lot of small, smaller and smallest HF
antenna's (eg. wire antenna's, inverted V, T2DF) that don't take full
advantage of the size of my land available. On the other end of the
spectrum there are plans for very, VERY large antenna's like Rhombic
and Beverage. For this size of antenna's my plot is to small.

Do you have suggestions for HF antenna's I should check out? Let me
know in this forum or pm me. Thanx in advance. 73

You have enough room for a full dipole at 1.8mhz. That's about 260 feet
long and, if you feed it at the center with twinlead or 450 ohm ladder
line or 600 ohm open wire line and run a tuner in the shack, it will also
function as an extended double zepp on 3.5mhz. Fed this way, these
antennas are incredibly frequency tolerant. You will be able to use it
right up through 10 meters, but be aware that it will have an
increasingly crazy pattern the higher you go. For best low-band
performance, you also want it as high as you can get it, depending on
whether your interest is DX or NVIS (near-vertical incidence nearby
contacts on 160 and 80m). If DX is what you're after, you may want to
consider some alternative strategy, depending on how much height you can
achieve. But for NVIS, 85 feet is about optimum and the antenna will
play well all the way down to around 30 feet. Below that you'll see some
ground effects.

If DX is your goal, you may want to consider phasing verticals. On 160m,
spacing them about 130 feet apart can make for a fairly steerable array.
This would still leave you room for full-size radials on two sides of the
antennas. If you use smaller, base-loaded verticals, then you can get
away with even shorter radials. On 80m, you actually have a LOT of room.

I once put two Electrospace HF verticals 65 feet apart (E-W) on a lot
quite a bit smaller than this. The Electrospace verticals played quite
well with just 8 radials each of 32 foot length (about the same as the
verticals' height). I brought equal length feedlines into the shack and
made a delay box with 65 feet ELECTRICAL length of RG8X in it, cut up
into pieces of 1/2, 1/4 and two of 1/8 the total length with dpdt
switches to but them in and out of the loop. Adding one more dpdt switch
for reversing the delay to the other side completed the box. This
antenna was VERY effective on 80m off its ends. On 40m (they were 80-40-
20m verticals), the pattern was more bipolar, but sharper than the more
oval pattern on 80m when the zero-delay setting was selected (for N-S)
pattern. Similarly, it began to be a bit grassy on 20m. Still, the main
lobe of it went the same place on every band for the same settings. And
the thing was efficient and had a low radiation angle. It was easily S9+
in New Zealand and Syria from Halifax, NS on 75m. The only drawback was
that, with short antennas like that, I had to either tune at the rig and
put up with losses on the coax or go out and tune the antennas to cover
the whole 80m band. If I had the real estate today, and the gear I have
now to tune antennas with, I'd probably try something similar, though
maybe in a four-square array for 80. 80 feet is a bit tight for one of
those, but you MIGHT just squeeze it in if you're careful.


--
Dave Oldridge+
ICQ 1800667

Larger size HF antenna's
 

"Maarten" wrote in message
oups.com...
Hi,

I seek some help, advise or suggestions on HF antenna's. I've bought a
house with a plot of approx 330 x 80 ft / 100 x 23 mtr available for HF
antenna's.
But when I research HAM HF antenna's, home build or commercially
available, I only find a lot of small, smaller and smallest HF
antenna's (eg. wire antenna's, inverted V, T2DF) that don't take full
advantage of the size of my land available. On the other end of the
spectrum there are plans for very, VERY large antenna's like Rhombic
and Beverage. For this size of antenna's my plot is to small.

Do you have suggestions for HF antenna's I should check out? Let me
know in this forum or pm me. Thanx in advance. 73

Maarten
maartenkoning2002 (at) yahoo.com


Check out -
http://www.bloomington.in.us/~wh2t/ant.htm

I discuss some large antennas.
73, Ace - WH2T

Larger size HF antenna's
 

Congratulations Dr. Ace!

You sure know how

to trash a place!

Best regards, Richard Harrison, KB5WZI

Larger size HF antenna's
 

"Richard Harrison" wrote in message
...
Congratulations Dr. Ace!

You sure know how

to trash a place!

Best regards, Richard Harrison, KB5WZI


Richard,
Yes, that's a fact.
73, Ace - WH2T