On Dec 18, 8:01 am, David wrote:
RHF wrote:
Build -DIY- The One Slinky Vertical Antenna -for-
Simplified Shortwave Listening (SWL)

Use a One Slinky Vertical Antenna Element that is located
as far-away from the House and Man Made Sources of Noise
as possible for your House and Property.
http://cgi.ebay.com/_W0QQitemZ180196824523

Note - Requires only one 23 Feet or Higher Mounting-Rigging*
Point for the Top-End of the Vertical Antenna Element.
* Rig with Nylon Mason Line.

- Is nylon mason line UV resistant?

No but it will work for a few years as a simple
Rigging line used to Hold-Up it's End of a Slinky.

- Why a 9:1 transformer?
- The feed point is already at 100 Ohms.

David - You could experiment with a different Matching
Transformers for this Single Element Vertical Antenna :
1:1 ~ 10 Turns Antenna-Side to 10 Turns Coax-Side
2:1 ~ 14 Turns Antenna-Side to 10 Turns Coax-Side
3:1 ~ 17 Turns Antenna-Side to 10 Turns Coax-Side
* 4:1 ~ 20 Turns Antenna-Side to 10 Turns Coax-Side
6:1 ~ 24 Turns Antenna-Side to 10 Turns Coax-Side
* 9:1 ~ 30 Turns Antenna-Side to 10 Turns Coax-Side
10:1 ~ 32 Turns Antenna-Side to 10 Turns Coax-Side
12:1 ~ 35 Turns Antenna-Side to 10 Turns Coax-Side
16:1 ~ 40 Turns Antenna-Side to 10 Turns Coax-Side

For Shortwave Listeners (SWLs)both the 4:1 for
Dipole 'type' {Balance} Antennas and 9:1 for Long-Wire
type {Un-Balanced} Antennas are good starting points.

Build a 4:1 Balun {Matching Transformer} for 160 to 10 Meters
-by- Clay Wynn
http://www.hard-core-dx.com/nordicdx.../4_1balun.html

Build a 9:1 Balun {Matching Transformer}
-hosted by- Hard-Core-DX
http://www.hard-core-dx.com/nordicdx.../9_1balun.html

Matching less Important for Reception
http://www.hard-core-dx.com/nordicdx...ed/balun5.html
-by- John Doty

Matching Is Important - It Gives Better Reception
http://www.hard-core-dx.com/nordicdx...ed/balun6.html
[ Matching Do Give Better Reception ]
-by- Guy Atkins

iane ~ RHF