On Feb 16, 12:54*pm, "RHF" wrote:
= = = Source - Rec-Radio-Shortwave - NewsGroup
= = = On Feb 16, 5:51*am, David wrote:
-
- The closer to 45 degrees the more omnidirectional the antenna.
- Otherwise just broadside it to the major directions of interest.
-
David - That is true.
IMHO - The T2FD Antenna needs the 30 Degree "Slope" {Tilt}
for better All-A-Round Shortwave Listening (SWL) Receptionhttp://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/12285
Sloping does add a Vertical Dimension to the T2FD Antennahttp://en.wikipedia.org/wiki/Dimension
and at 45 Degrees the Horizontal and Vertical Aspects are
Equal and the Signals should be more Omni-Directional
{All-A-Round} then -if- the T2FD Antenna is simply Rigged
Horizontal [Flat]. *=But= 30 Degrees is what is most often
the recommended Sloping Angle for the T2FD Antenna.
"Actually, the idea behind the slope is to make it more
omnidirectional. *The ideal slope is something like 30
degrees, but there's no hard-and-fast rule on this.
Set it up as best you can." -by- Eric F. Richards [R.R.S]http://groups.google.tt/group/rec.radio.shortwave/msg/bb4ab0c2009b662c
Then to Quote Myself in a prior Post :
"Yes 30 Degrees works well for most Sloping Receiving Antennas.
Horizontal (Flat) Wire = 100% Horizontal Dimension Area of Radiation.
Vertcal (Upright) Wire = 100% Vertical Dimension Area of Radiation.
45 Degree Sloping Wire = 50% Horizontal and 50% Vertical
Dimension Area of Radiation.
30 Degree Sloping Wire = 87% Horizontal Dimension and
50% Vertical Dimension Areas of Radiation.
- - - Roughly speaking.
The 30 Degree Sloping Wire Antenna Element to some
degree can be though of as the same space equalent as
an Inverted "L" Antenna which would make up the other
Two Sides of a Triangle created by the Sloping Side.
* *30 Ft Sloper Antenna would take up the same space as
a 15 Ft Vertical by 26 Ft Horizontal Inverted "L" Antenna.
Note - This Inverted "L" would be 41 Ft long (+11 Ft) and
have 37% more Wire-in-the-Air.
* *52 Ft Sloper Antenna would take up the same space as
a 26 Ft Vertical by 45 Ft Horizontal Inverted "L" Antenna
Note - This Inverted "L" would be 71 Ft long (+19 Ft) and
have 37% more Wire-in-the-Air.
- - - For some it simply comes down to the fact that the
Sloping Wire Antenna may be eaiser to Rig then the
Inverted "L" Wire Antenna." -by- RHFhttp://groups.google.tt/group/rec.radio.shortwave/msg/4e016d6d5422adb3
"The T2FD Antenna when Mounted at an Angle of 30 Degrees
will provide an Omni-Directional response with Low Noise."
T2FD INFO =http://www.wellbrook.uk.com/UMBT2FD.html
The Wellbrook Universal Magnetic Balun UMB T2FD is a
Receiving Antenna Balun with a 9:1 impedance ratio, and
an integral 500 Ohm 5W Thick Film Termination Resistor.
This Wellbrook T2FD Balun is specifically designed to simplify
the construction of the T2FD Antenna.
Diagram of the Typical Erection of the T2FD Antenna
T2FD DIAGRAM =http://www.wellbrook.uk.com/UMBT2FD.html
READ - More About the T2FD Antenna
"T2FD -- The Forgotten Antenna" -by- Guy Atkinshttp://www.hard-core-dx.com/nordicdx/antenna/wire/t2fd.html
* *Designing the T2FD Antenna
Note # 3. The Sloping Angle for a Non-Directional {Omni}
Receiving Antenna Pattern should be on the order of 30 Degress,
but 20–40 Degrees is acceptable.http://www.hard-core-dx.com/nordicdx.../t2design.html
* *How to Feed a T2FD Antenna Correctlyhttp://www.hard-core-dx.com/nordicdx/antenna/wire/t2fdfeed.html
* *The T2FD Antenna a match for any Shortwave Listening (SWL) Antennahttp://www.hard-core-dx.com/nordicdx/antenna/wire/t2fdcomp.html
* *The T2FD Antenna an Excellent Shortwave Receiving Antennahttp://www.hard-core-dx.com/nordicdx/antenna/wire/t2fd_1.html
HARD-CORE-DX.COM =http://www.hard-core-dx.com
ANTENNA SPECIAL=http://www.hard-core-dx.com/nordicdx/antenna/
3-degrees-of-separation -or- 30-degrees-of-slope
considering the numb3rs - iane ~ RHF {pomkia}
*.
Shortwave Listener (SWL) Antennas Group =http://tinyurl.com/ogvcf
GoTo =http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
The SWL Antenna Discussion Group =http://tinyurl.com/ogvcf
Shortwave Listener (SWL) Antenna HELP =http://tinyurl.com/ogvcf
Shortwave Listener (SWL) Antenna NEWS =http://tinyurl.com/ogvcf
Shortwave Listener (SWL) Antenna INFO =http://tinyurl.com/ogvcf
* * * All Are Welcome : Including ELMERS and 'Want-to-be-Elmers'
plus plain old "Mister-Know-It-Alls"; and even those Newbees with
"I Know This Is A Really Dumb Question - But _ _ _ _ _ _ _ _ "
*.
The Shortwave Listener's Blessing :
SWL BLESSING =http://tinyurl.com/s2bjm
May You Never Tire of Listening to the Radio and Always
have Strong Signals and Noise Free Reception ~ RHF {ibid}http://groups.yahoo.com/group/Shortw...a/message/9233
*.
Tous Sont Bienvenus ! - - - Groupe par Radio
d'auditeur d'onde courte pour des Antennes de SWLhttp://groups.yahoo.com/group/Shortwave-SWL-Antenna/
*.
Alle Sind Willkommen ! - - - Shortwave Radiozuhörer
Gruppe für SWL Antennenhttp://groups.yahoo.com/group/Shortwave-SWL-Antenna/
*.
Tutti Sono Benvenuti ! - - - Gruppo Radiofonico
dell'ascoltatore di onda corta per le Antenne di SWLhttp://groups.yahoo.com/group/Shortwave-SWL-Antenna/
*.
Todos São Bem-vindos ! - - - Grupo de Rádio
do ouvinte do Shortwave para Antenas de SWLhttp://groups.yahoo.com/group/Shortwave-SWL-Antenna/
*.
Все *адушны ! - - - Группа оператора
на приеме коротковолнового диапазона
Radio для Aнтенн SWLhttp://groups..yahoo.com/group/Shortwave-SWL-Antenna/
*.
¡Todos Son Agradables! - - - Grupo de Radio del oyente
de la onda corta para las Antenas de SWLhttp://groups.yahoo.com/group/Shortwave-SWL-Antenna/
*.
= = = = Plain Old American-English Translation = = = =
All are Welcome - - - To Join the Shortwave Listeners
(SWL) Antenna Group on YAHOO !http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
*.
*|
*|
*|
/ \
.......!.......
this is what RF systems wrote me back:
RFI is a BIG problem. You must have a antenna receiving the magnetic
component of radio signals. Most antennas receive the electric part.
It is just that electric part which carries the RFI.
All RF-Systems antennas are Magnetic antennas. The best choice is to
use a closed (dipol) antenna ( is also the most expensive
choise.............) The T-2FD will ouperforme the MK-4 longwire, but
if the T-2FD can kill your RFI..................hard to say! The
optimal angle to hang the T-2FD is 30 degree for closeby and DX
traffic. If you cannot hang it in a 30 degree angle it is no problem.