Richard Harrison wrote:
Orr says he used both the Yagi and the Quad for years as did many of his
good friends. He says objective and subjective tests show the Quad has a
definite advantage in terms of signal strength over the Yagi antenna.

It is good to remember that the Quad was invented to solve a particular
problem.

From Orr's book concerning the 4-element Yagi initially installed:

"Totally unexpected, however, was the effect of operating the high-Q
(Yagi) beam antenna in the thin evening air of Quinto. Situated at 10,000
feet altitude in the Andes, the beam antenna reacted in a strange way to
the mountain atmosphere. Gigantic corona discharges sprang full-blown from
the tips of the driven element and directors, standing out in mid-air
and burning with a wicked hiss and crackle. The heavy industrial aluminum
tubing used for the elements of the doomed beam glowed with the heat of the
arc and turned incandescent at the tips. Large molten chunks of aluminum
dropped to the ground as the inexorable fire slowly consumed the antenna."

"The corona discharges were so loud and so intense that they could be seen
and heard singing and burning a quarter-mile away from the station. The
music and programs of HCJB could be clearly heard through the quite night
air of the city as the r-f energy gave fuel to the crowns of fire clinging
to the tips of the antenna elements."

C. Moore invented the Quad beam to solve that somewhat special problem.

Quads also have all the advantages that loops enjoy over dipoles. One
thing that comes to mind is a marked reduction in static electricity due
to wind and snow because the entire loop is virtually at DC ground.
--
73, Cecil http://www.qsl.net/w5dxp



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Quads also have all the advantages that loops enjoy over dipoles. One
thing that comes to mind is a marked reduction in static electricity due
to wind and snow because the entire loop is virtually at DC ground.

A yagi built with "plumbers delight" construction has every element bolted
directly to the metal boom, so every element is at DC ground.

Torsten
N4OGW

Quads also have all the advantages that loops enjoy over dipoles. One
thing that comes to mind is a marked reduction in static electricity due
to wind and snow because the entire loop is virtually at DC ground.
--
73, Cecil http://www.qsl.net/w5dxp



That's what I thought too, I built the quads using insulated wire in hope to
eliminate atmospheric static, but I could barely tell the difference. What made
huge difference (wiping out static completely) is the use of stacked antennas,
or having larger antenna over the one in use. The top one would be 20 over S9
while lower one is dead silent.

Quad advantages: made of wire, no corroded junctions like with Al tubing. Quads
rule up to about 5 el. then Yagis take over. I have 3 el. design that is 50
ohms, no matching, broad band. One advantage quad has that it is only antenna
that can be used for different polarizations with the same hardware. Parasitic
loop doesn't know what polarization it is.

Yuri, K3BU.us

When I compared my requirements against what a yagi versus a quad would
deliver, there was no contest - a quad met my needs better than a yagi. I
purchased a Gem boomless (spider) quad for the following reasons:
- lightweight (small rotor)
- small footprint (9 foot turning radius)
- all bands including WARC from 6 - 20 meters
- optimally spaced elements for each band
- individually tune each band without interaction
- good performance, quiet receive
- no magic (traps)... I can build it, tune it, fix it
- relatively inexpensive

Notice that my requirements do not include the best gain figures nor the
best F/B ratio --- which I think you will only get with a monoband
no-compromise yagi. Unfortunately, yagis don't meet my other requirements.

-larry
K8UT
"Thierry" To answer me in private use
http://www.astrosurf.com/lombry/post.htm wrote in message
...
Hi,

Before investing in a future antenna I have discussed on my site about
antennas designs, quad vs yagi or log.
http://www.astrosurf.com/lombry/antenna4.htm
I would like to get more information from users. If you used both quad and
Yagi, I should be curious to know your opinion about both designs, pro and
cons in various conditions of work (installed on the roof, 10m away fro
the
hosue, 2m high only, etc).

I need for example some more information about the noise generated by a
yagi
vs a quad or any other relevant information at which I don't think about.
For example, at first "sight" the quad generates 5-10 dB less than a quad.
Have you some similar information or other with all relevant data (nbr of
elements of concerned antennas, wind speed during measurements, location
of
antenna, etc).

Also, I am interested in the drawbacks of each model (quad, yagi, log). I
discuss about this problem too, but I 'd like to go further in this
matter.
The question is : why did you choose - or didn't choose - this design
(another reason than its price with is of course the main factor).

Thanks in advance

Thierry
ON4SKY