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September 26th 05, 10:14 PM
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From: "RHF" Organization: http://groups.google.com Newsgroups: rec.radio.shortwave Date: 26 Sep 2005 10:34:08 -0700 Subject: The "Slinky" Sloper Antenna ! - Will the Angle of the Dangle . . . cause a Commotion in the Trans-Ocean DX ? Greg - There You Go Again - The "Slinky" Sloper Antenna ! . Will the Angle of the Dangle . . . cause a Commotion in the Trans-Ocean DX ? http://groups.yahoo.com/group/Shortw...a/message/5447 . Basics - The standard Full Size Slinky has about 100 Turns with a Diameter of 2 3/4 Inches and a Circumference of 8.64 Inches for a Total Wire Length of 72 Feet. . How Long Does It Get ? - I Calculate that the Optimum* "Stretched-Out" Length of a Slinky would be about 22.9 Feet. . * Note - Based on the "Spacing" of the Coil being 'equal' to the Diameter of the Coil. . THE "SLINKY" SLOPER ANTENNA : A simple single (1) "Slinky" Sloper set at a 45* Angle would have about a 16 Foot Ground Foot-Print with a Height of about 17 Feet (16+1) with a Ground Level Feed-Point starting at a Ground Rod with the Top about One Foot (1') above ground level. . ? ? ? What About Super Sizing It ! ! ! The Super Size "Slinky" Sloper Antenna would be made of Three (3) Slinkys set at a 45* Angle would have about a 48 Foot Ground Foot-Print with a Height of about 50 Feet (48+1) with a Ground Level Feed-Point starting at a Ground Rod with the Top about One Foot (1') above ground level. . TIPS : - Use a 9:1 Matching Transformer (UnUn) between the Coax Cable Feed-in-Line with your Sloper Antenna for better Shortwave Listening use. - Feed the Slinky Sloper from the Far-End with a remotely located Ground Rod and the Coax Cable directly underneath the Slinky on the ground or buried under the ground. . FWIW - One advantage of the Sloper Antenna Design is that it only requires One "Elevated" Mounting Point to Rig the Antenna Element along with a ground level mounting point. . iane ~ RHF . All are WELCOME and "Invited to Join" the Shortwave Listener (SWL) Antenna Group on YAHOO ! http://groups.yahoo.com/group/Shortwave-SWL-Antenna/ SWL ANTENNAS GROUP = http://tinyurl.com/an6tw . Some Say: On A Clear Day You Can See Forever. http://groups.yahoo.com/group/Shortw...na/message/502 . I BELIEVE: On A Clear Night . . . You Can Hear Forever and Beyond, The BEYOND ! With a Shortwave Listener SWL Antenna of your own making. "If You Build It {SWL Antenna} You Will Hear Them !" . . As always, thanks for the excellent info. Geg |
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