- - - In
,
- - - "F C" march181959@... wrote:
http://groups.yahoo.com/group/Shortw.../message/14085
-
- That looks simple enough and a good workable solution.
-
- I was confused about the A,B,C feed points.
-
- Are these all spliced together to the feed in line.
- or are they separated by a switch so that they are
- used separately on each respective band?
-
- Thanks
-
- FC
-
FC,
Simpler 3-Bander Horizontal Wire Antenna for Shortwave Listening
(SWL) - Message # 14039
http://groups.yahoo.com/group/Shortw.../message/14069
.
"A" and "B" and "C" are simply Designators for the 'individual'
Antenna Wires in the Three Wire Rotor Cable
.
At the Feed-Point "X" are three Wires are Connected together.
.
- Feed-Point . . . . . . . . . . . . . Far-End -
.
A X----------------------------------------------o 48 Feet ~ 60m
.
B X-----------------------------------o_o--------o 39 Feet ~ 49m
.
C X-----------------------------o_o--------------o 33 Feet ~ 41m
.
A = 48 Feet ~ 1/4 WL for 60 Metre Shortwave Band ~ 4.7 MHz
B = 39 Feet ~ 1/4 WL for 49 Metre Shortwave Band ~ 5.9 MHz
C = 33 Feet ~ 1/4 WL for 41 Metre Shortwave Band ~ 7.1 MHz
.
"X" = Antenna Feed-Point Connection-Point for All Three Wires
"-" = Wire Antenna Element
"o" = End 'No' Connection
"_" = One Inch Gap {Space between the Wire Ends}
.
.
* * * REVISION * * *
.
Re-Order the Three Wires with the {Un-Cut} "A" in the Center
and the "Cut" "B" and "C" Wires on the Out-Side.
.
B X-----------------------------------o_o--------'b' 39 Feet ~ 49m
.
A X----------------------------------------------'a' 48 Feet ~ 60m
.
C X-----------------------------o_o--------------'c' 33 Feet ~ 41m
.
WHY - This 'places' the Two Wires that have to be "Cut" with
a One-Inch piece {Gap} remove on the Out-Side to make the build
process a little easier.
.
* * * ALTERATION * * *
.
The 'b' Far-End 9-Feet Remnant of "B" can be joined to the
'c' Far-End 15-Feet Remnant of "C" to form a bent 24 Foot
passively-coupled Antenna Element for the 31m Band. Can't
hurt and may help.
.
* * * THE FEED=POINT CONNECTION * * *
.
This is a Multi-Element Antenna that is "Cut' for Three
Shortwave Bands. The Feed-in-Line can be a Coax Cable
with the Inner Conductor 'connected' to the Wire Antenna
Elements -and- having the Outer-Shield of the Coax Cable
Grounded at/in the Radio Shack.
.
NOTE - The use of a 9:1 Matching Transformer between the
Antenna Elements and the Coax Cable feed-in-line is "Optional"
-but- May provide better performance. In this instance
the Matching Transformer* would be Wired :
.
Nine-Side : Antenna Element Wires and the Outer-Shield of
the Coax Cable.
.
One-Side : Inner Conductor of the Coax Cable and the Outer
Shield of the Coax Cable.
.
* This configuation of the Matching Transformer is a
'so-called' Magnetic Longwire Balun (MLB)
.
.
hope this helps - iane ~ RHF
.
Question About - The 3-Bander Rotor Cable SWL Antenna
http://groups.yahoo.com/group/Shortw.../message/14086
.
.
.. .
= = = On Aug 1, 4:15 am, RHF wrote:
On Aug 1, 4:11 am, RHF wrote:
For One and All,
.
Some one on another Group pointed out that the old 5-Wire "Flat"
TV Rotor Cable is getting hard to find.
.
They noted that their RadioShack still had some of the more
common 3-Wire "Flat" TV Rotor Cable available.
.
RadioShack - 100-Ft. Rotator Control Cable (3-Wire)http://www.radioshack.com/product/in...ductId=2049616
RadioShack Catalog # 15-1150
.
Plus they wanted a simple Multi-Band Horizontal Wire Antenna
to 'span' the 55 Foot distance across their backyard.
.
- Simpler 3-Bander Horizontal Wire Antenna for Shortwave Listening
(SWL)
REF Message # 14069http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/14069
.
- Feed-Point . . . . . . . . . . . . . Far-End -
.
A X------------------------------------------------o 48 Feet ~ 60m
.
B X-----------------------------------o_o--------o 39 Feet ~ 49m
.
C X-----------------------------o_o--------------o 33 Feet ~ 41m
.
A = 48 Feet ~ 1/4 WL for 60 Metre Shortwave Band ~ 4.7 MHz
B = 39 Feet ~ 1/4 WL for 49 Metre Shortwave Band ~ 5.9 MHz
C = 33 Feet ~ 1/4 WL for 41 Metre Shortwave Band ~ 7.1 MHz
.
"X" = Antenna Feed-Point Connection
"-" = Wire Antenna Element
"o" = End 'No' Connection
"_" = One Inch Gap {Space between the Wire Ends}
.
Note # 1 - Do Not Separate The Wires - Maintaining the Integrity
of the Wire Bundle throughout it's length : Except at the
Feed-Point where the Wires may be separated for about 2-Inches
and Stripped and Soldered for about an Inch for Connection to
the Matching Transformer.
.
Note # 2 - Cut the One Inch Gap {Space between the Wire Ends}
very carefully using an Exacto Knife and remove the piece of
Wire while maintaining the integrity of the Wire Bundle.
.
Note # 3 - All of Wire "A' is used; the Far-End 9-Feet Remnant
of "B" is not used; and the Far-End 15-Feet Remnant of "C" is
not used. However they are maintained in the Wire Bundle to
give it uniform strength throughout it's length.
.
Note # 4 - Mounting Height 1/2 A (24 Ft) to 1/2 C (16 Ft)
.
Note # 5 - Use a Longwire {Random Wire} Matching Transformer
and Coax Cable feed-in-line with a good earthen Ground (Rod).
.
MAKE IT LONGER BY TWO SHORTWAVE BANDS :
A = 71 Feet ~ 1/4 WL for 90 Metre Shortwave Band ~ 3.2 Mhz
B = 60 Feet ~ 1/4 WL for 75 Metre Shortwave Band ~ 3.9 Mhz
C = 48 Feet ~ 1/4 WL for 60 Metre Shortwave Band ~ 4.7 MHz
.
MAKE IT SHORTER BY TWO SHORTWAVE BANDS :
A = 33 Feet ~ 1/4 WL for 41 Metre Shortwave Band ~ 7.1 Mhz
B = 24 Feet ~ 1/4 WL for 31 Metre Shortwave Band ~ 9.4 Mhz
C = 20 Feet ~ 1/4 WL for 25 Metre Shortwave Band ~ 11.6 MHz
.
.
build your own and give it a try - amaze yourself - 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/
.
¡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/
.
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