On Nov 23, 8:48 pm, "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?
- 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/an...ve-antenna.php

Safety Tips for Shortwave Antennas
http://www.universal-radio.com/catal...t/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}