On Dec 18, 4:13 pm, RHF wrote:
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.
RIGGING : The One Slinky Vertical Antenna
Adding Mechanical Support for the Slinky against the Elements.
1 - Route the Nylon/Poly Mason Line through {down}
the Center of the Slinky Coils.
2 - Tie the Nylon/Poly Mason Line to the Ground Rod*.
* The Ground Rod is where the Matching Transformer is
mounted and the 'Bottom' of the Slinky is attached to
the Matching Transformer.
3 - Stretch-Out the Slinky to 22 Feet; being sure to
keep the Nylon/Poly Mason Line running down the Center
{inside} the Slinky Coils.
4 - Tie-Off the Nylon/Poly Mason Line at 22 Feet to the
'Top' of the Slinky.
5 - The remainder of the Nylon/Poly Mason Line is then
used to Rig the Slinky from what ever 22 Foot or Higher
support you have to Rig-it-to.
? WHY ? Strectch-Out the Slinky to 22 Feet ?
* The Original {Standard} Slinky Stretches-Out to an
'Optimum' Length of 21~23 Feet. So this One Slinky Antenna
need only be about 22 Feet long between the Low-End
near the Ground and it's High-End up in the Air.
* Original {Standard} Slinky is made-up of 100 Turns
(Coils) of Steel Wire that is 2 3/4" (2.75") in Diameter.
* The Optimum Spacing for an Inductor is when the Space
between the Coils is equal to the Diameter of the Coils.
So... 2.75" x 100 = 275 Inches = 22 Feet 11 Inches
-Note- Some Count the Slinky's Coils and only come up
with about 90 Coils - So Adjust your Math accordingly.
NOTE - If you are in a Bad Weather Area you may wish to
use Camouflage Nylon Parachute Cord or even 3/16" Black
Poly Rope as your Rigging Line with the Slinky.
iane ~ RHF