bck

an antenna without a noise

Translation to which a noise will be turned off if an antenna is turned
As for the directive horizontal antenna of the vertical plane of the vertically
polarized wave of VDP,
the directivity of horizontal polarization comes out of whether if an antenna
is turned with
an antenna without a noise, a noise will decrease to the perpendicular direction
of an antenna wire as directive level DP of the level surface of the vertically
polarized wave of VDP in level DP,
It is in the direction in general.
Electric wave reception and transmission strength become strong.
However, vertically polarized wave components come just beside also

Electric wave reception and transmission strength become strong.
However, vertically polarized wave components come just beside also
with the antenna stretched horizontally.
The place of this neighborhood has much misunderstanding.
Although the direction with experience which built many antennas is known
experientially, a vertically polarized wave antenna is unusually.
A noise increases.
specially a neighboring noise is well receivable wonderfully.
At the antenna for noises
It is the optimal.
Since the antenna of low frequency is large and it is not raised highly,
the radiation angle of a horizontally polarized wave antenna is high,
and most goes up among them near right above.
It comes together and does not take over many neighboring noises in
horizontal polarization directivity.
A vertical antenna cannot be overemphasized here, and since there is
directivity just beside mostly, many neighboring noises are gathered and it
collects them.
The left figure is the horizontal plane directivities of level DP.
Red is vertically polarized wave components.
Black is a horizontal polarization component.
Vertically polarized wave components
The directivity of a horizontal polarization side and the direction of 90 ℃ have shifted.
In the upper (x-axis: direction of beam) direction, it is unreceivable at all.
That is, the front is in a null state.
But from just beside
The coming noise will be received perfectly.
The vertical plane directivity of a vertically polarized wave is just beside mostly.
That is, it is aimed to gather ambient noise.
The directivity by which both the polarized waves in the level surface were compounded
is the left figure.
However, the vertically polarized wave components which are easy to receive a noise will
receive a noise from just beside.
In order to escape a noise, if vertically polarized wave components turn the Nur (zero)
point to a noise source, it will become powerful arms to a noise.
it being alike and receiving an object signal with synthetic directivity, in the place
just beside towards in that case, -- several -- since it is a decrease of db, there is
no big attenuation
On low frequency, this tendency appears strongly especially.
If it corrects and a road clearance is made fairly high, the noise penetration from vertically
polarized wave components can be prevented, but it is not for poor persons.
V type whose radiation angle is low when a road clearance is not raised enough is comparatively
often far away.
Although it arrives, it is in the field of a noise. It is effective although the noise
reduction effect at the time of rotating since the directivity of vertically polarized wave
components occurred also ahead fades a little.
If V type DP is raised not much highly, it will become unsuitable for domestic QSO.
If it is about 10m±5m
It will become advantageous suddenly at the strong point which can turn a small horizontal antenna.
This simulation is performed by seven MHz electric supply part 10 m in height.
The above tendency will become more remarkable if frequency becomes low.
The following figure is the directivity of a perpendicular component.
Please refer to it.
A noise is as large as the antenna with them which has many vertically polarized wave components. [ low ]
V DP is DP horizontally installed although the perpendicular component remained in all
the directions. There is a null point completely.
The difference of 10 or more db comes out by this difference.
It is the conditions of a highly efficient antenna that a low antenna is level after all and it can rotate.
Moreover, if it is not necessary to generally stretch north and south by wire DP and a beam is
turned to the arrival directions of a noise, since a perpendicular component is a null point,
It continues for a long period of time in the experiment of 3.565MHz DP,
JA1QLY (Mr. Hasegawa ) I received cooperate and advice, if it was ordinary at
JA1WPH (Mr. Saegusa ).
Gratitude is expressed here.
If there are not cooperation of the methods of two and guidance, I will add that it was not
able to complete and it will consider it as the language of gratitude.
2013/03/02 JO7NLI  Takasi.Matsuzaki


* Level DP is a vertically polarized wave to the direction of a beam.
A component is zero.
A noise is received only from just beside.
Vertically polarized wave components turn to just beside, and a horizontal polarization
component turns to right above.
But when level DP is used, both have strong directivity.
The radiation angle of vertical plane directivity at which vertically polarized wave
components occurred ahead and 2013/03 / 03 correction BACK  VDP was compounded although
vertically polarized wave components just beside decreased serves as for fall DX.
It does not change with an upward beam pattern! Simulation conditions 7 MHzCAP-HAT
antenna 10m height MMANA data: Level &V type To the full, please carry out a simulation
by MMANA.
a noise will decrease sharply.
Attenuation of the signal by it is about 2 db.
Ten or more db of noises are decreased.
In comfortable communication, noiseLess is FB.
If especially my dear friends currently afflicted by the noise of the circumferences,
such as an urban house, are tried and see, they will be able to feel actually.
In addition, it is also continued to aim at the antenna which repeats an experiment and
does not have a more efficient noise.
I appreciate your cooperation.
Especially