Ferrite Rod AM/MW Antennas : To Tilt ? -or- Not to Tilt ? {What's The Difference... If Any ?}
RHF
Subject Line -was- Palstar Active Antenna
http://groups.google.com/group/rec.radio.shortwave/msg/9b469d21b923de34
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- Paul wants to have it ready for Dayton.
- I am not sure when full scale production will start.
- Right now, I am working out the details of the antenna enclosure.
- Should this antenna be tiltable?
- I never use that function, but it seems as if many folks do.
-
- Pete
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Question - Should this Ferrite Rod Antenna be "Tiltable" ?
Ferrite Rod AM/MW Antennas : To Tilt ? -or- Not to Tilt ?
{What's The Difference... If Any ?}
Pete,
I think that Tilting works best for a Constant and Predictable
Skywave RF Signals which usually means the first Reflection
{Bounce-Skip}. After that things get more scattered and
Tilting seams to work less. [ That's My One-Man's-Opinion. ]
Consider these Two View :
1st - Ferrite Rod Antenna Element that is used in the Flat
[Horizontal] position and is simple Rotated 360 Degrees
around to Receive {Peak or Null-Out} a Radio Signal.
[ This is a Broad-Side : Point-and-Shoot ]
With a Ferrite Rod type Antenna in the Horizontal [Flat]
position and simply Rotated : The normal Angle of Signal
Capture is incident and Equal on Both Horizontal Sides
of the Ferrite Rod.
> || <
> || <
> || <
> || <- Directions of the Incoming RF Signals
> || <
> || <
> || <
> || <
"||" Ferrite Rod that is Flat {Horizontal}
2nd - With a Ferrite Rod type Antenna that is "Tilted" the
normal Angle of Signal Capture is Incident to the Top Surface
that is position to accept Incoming RF Signals directly from
the Sky-Wave; and therefore the Bottom {Back Side} is
postioned for Incoming RF Signals that are Refected "Off"
the Ground. Top and Bottom Signals are NOT Equal*.
* There is a Difference {Delta} between the Direct Sky-Wave
Signals and those Reflected Ground Signals. This Delta is
what "Tilting" the Antenna Element is supposed to do to
Enhance {Optimize} the Surface of the the Tilted Top of
the Ferrite Rod Antenna to Maximise the RF Signal being
received.
|| <
g . || <
r . . . || <
o . . . . . || <= Direction of the Incoming Sky-Wave RF Signal
u . . . . . . . || <
n . . . . . . . . . ||
d . . . . . . . . . . . ||
USING - The Tilled Ferrite Rod Antenna :
The Ferrite Rod Antenna is first Tilted at 45 Degrees and then
Rotated around the Compass 360 Degrees to achieve the Best
RF Signal from the Target AM/MW Radio Station; after which
adjustments to the Tilt and Rotation can be made to Fine Tune
the position of the Ferrite Rod Antenna.
- = I D T A R S = -
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