Alpha Delta - Balun or not?
News
With no reply from Alpha Delta to my enquiry regarding the benfits of adding
a balun to a stock installation of their DX-SWL Shortwave Sloper Antenna, I
ask of you the same question... is this a no-brainer? Shuild I be injecting
a ~10:1 balun in order to maximize efficiency? I have seen nothing on the
'net to date specifically referring to this design or the merits of
modifying same..
Regards,
Blair
Aurora, Ontario
RHF
-
- Good evening, all.
-
- With no reply from Alpha Delta to my enquiry regarding the benfits
- of adding a balun to a stock installation of their DX-SWL Shortwave
- Sloper Antenna, I ask of you the same question... is this a no-
brainer?
- Shuild I be injecting a ~10:1 balun in order to maximize
efficiency?
- I have seen nothing on the 'net to date specifically referring to
this
- design or the merits of modifying same..
-
- Regards,
-
- Blair
- Aurora, Ontario
Blair,
Why a 10:1 Matching Transformer ?
Why not a 4:1 Matching Transformer ?
Why Not First Use the Alpha Delta DX-SWL Shortwave
Sloper Antenna As It Was Designed To Be Use ?
{With-Out A Matching Transformer}
About - Alpha Delta DX-SWL Shortwave Sloper Antenna
http://www.alphadeltacom.com/pg7.htm
Installation Instructions for the Alpha Delta
DX-SWL Shortwave Sloper Antenna
http://www.alphadeltacom.com/dxswlii.htm
NOTE - The Alpha Delta DX-SWL Shortwave Sloper
Antenna is Designed with an SO239 Connecter to
'match-up-with' a 50 Ohm Coax Cable.
* One Wire "Antenna Element" that is 60 Feet Long
* One Wire "Down-Lead" that is 30 Feet Long
Think of it as an Off-Center-Fed Dipole Antenna that
has One Arm Sloping; and the 'other' Arm Hanging
Vertically Down. {Lazy "L" Windom Antenna}
Some Shortwave Listeners will use a 4:1 Matching
Transformer with a Dipole Antenna to make it more
usable on more Shortwave Bands. IMHO the design
of the Alpha Delta DX-SWL Shortwave Sloper Antenna
get around the need for a 4:1 Matching Transformer.
You could as an Experiment 'try' using a 4:1 Matching
Transformer with the Alpha Delta DX-SWL Shortwave
Sloper Antenna to 'see' -if- the Matching Transformer
will make it more usable on more Shortwave Bands.
However - Alpha Delta DX-SWL Shortwave Sloper Antenna
http://www.universal-radio.com/catalog/sw_ant/0799.html
is already advertised as being designed and 'usable' on the
AM/MW Radio Band and the Shortwave Radio Bands :
120m + 90m + 60m + 49m+ 41m + 31m + 25m + 21m +
19m + 16m + 13m (Coverage : 500 kHz to 22 MHz)
http://www.radiolabs.com/products/antennas/shortwave/outdoor-shortwave-antenna.php
Safety Tips for Shortwave Antennas
http://www.universal-radio.com/catalog/sw_ant/safeswl.html
Line Isolation 1:1 Transformer -IF- You are having some
Common Mode Noise Problems you may wish to consider
using a Line Isolation 1:1 Transformer in the Coax Line
before it enters the House.
hope this helps - iane ~ RHF {pomkia}
.
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* * * 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 _ _ _ _ _ _ _ _ "
.
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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/Shortwave-SWL-Antenna/message/9233
.
Tous Sont Bienvenus ! - - - Groupe par Radio
d'auditeur d'onde courte pour des Antennes de SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
Alle Sind Willkommen ! - - - Shortwave Radiozuhörer
Gruppe für SWL Antennen
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
Tutti Sono Benvenuti ! - - - Gruppo Radiofonico
dell'ascoltatore di onda corta per le Antenne di SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
Todos São Bem-vindos ! - - - Grupo de Rádio
do ouvinte do Shortwave para Antenas de SWL
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de la onda corta para las Antenas de SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
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= = = = 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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dxAce
News wrote:
> Good evening, all.
>
> With no reply from Alpha Delta to my enquiry regarding the benfits of adding
> a balun to a stock installation of their DX-SWL Shortwave Sloper Antenna, I
> ask of you the same question... is this a no-brainer? Shuild I be injecting
> a ~10:1 balun in order to maximize efficiency?
Please explain just why you think adding a 10:1 balun would 'maximize
efficiency' of this particular antenna.
I'd be interested in the theory behind this.
dxAce
Michigan
USA
David
one transformer is not needed as the antenna is already sufficiently
matched to the feedline.
Terry M.
Here is a good write up regarding the Balun from the ARRL ---->
http://www.arrl.org/tis/info/pdf/8004019.pdf
Bob Miller
Many a year ago I had that exact antenna connected to my JRC NRD-525,
and it worked most excellently with no balun. The antenna is probably
resonant on most of the popular swl frequencies, since it is tuned up
with the various coils & elements. Just connect 'er with a piece of
coax and have fun.
bob
k5qwg