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On 4 Oct 2005 10:45:32 -0700, "RHF"
wrote: For One and All, . Question - What Is... The Alpha Delta DX-SWL Sloper Antenna ? http://groups.yahoo.com/group/Shortw...a/message/5619 . ABOUT - The Alpha Delta DX-SWL Sloper Antenna : http://www.alphadeltacom.com/pg7.htm http://members.tripod.com/~bpadula/sloper.html http://tinyurl.com/9cqzn http://www.universal-radio.com/catalog/sw_ant/0799.html http://www.universal-radio.com/catal...nt/0799om.html . Is it a true 'pure' Sloper Antenna ? - In a Word "NO" . First - There are those two "Iso-Res" Resonators aka : Loading Coils. http://www.rys.nl/addxswl_ii.htm DX-SWL = http://www.alphadeltacom.com/dxswl_ii.htm . Then - The SO-239 Jack Connecting and Mounting Point for the Coax Cable has both the Sloping Wire Antenna Element +plus+ the Vertical Down-Lead connected to it. Sort of Kind of 'like' a Dipole (Almost). http://www.rys.nl/addxswl_ii.htm http://www.alphadeltacom.com/dxswl_ii.htm No, not like a dipole. . But - The Sloping Wire Antenna Element is 60 Feet Long and the Vertical Down Lead is only 30 Feet Long. So then it is more 'like' an Off-Center Fed Dipole or Windom Antenna. http://www.rys.nl/addxswl_ii.htm http://www.alphadeltacom.com/dxswlii.htm The 30 foot section is supposed to act like a tower would in a 'classic' sloper configuration. . Next - We have the 16 Foot {Matching} Stub as an added feature. http://www.rys.nl/addxswl_ii.htm http://www.alphadeltacom.com/dxswlii.htm Not a matching stub, read the manual and you see that while they call it a stub it is attached to the center conductor and is listed as the element for 16 - 21 meter bands. . Plus - It is Sloped at about a 75* Sloping Angle vice 45*. http://www.rys.nl/addxswl_ii.htm http://www.alphadeltacom.com/dxswl_ii.htm It is sloped at whatever angle the user can manage, though the manual states 20 - 40 feet with 25 feet being 'best overall'. Haven't bothered to figure out the angle as regardless of what the manual says - users will install based on what they can accomplish at their location. . Finally - The Antenna is configured more 'like' a Top-Fed Lazy "7" {Seven-on-it's-Side} and uses a Coax Cable as the Feed-in-Line to the Radio/Receivers. http://www.rys.nl/addxswl_ii.htm http://www.alphadeltacom.com/dxswl_ii.htm Well I have to give you this one. So the Question Remains : What Is... The Alpha Delta DX-SWL Sloper Antenna ? http://www.rys.nl/addxswl_ii.htm http://www.alphadeltacom.com/dxswl_ii.htm . A commercially made wire antenna that is, in my estimation, a bit overpriced - like all other commercially made wire antennas - but it does what is claims. I've used their shortened version and in A/B comparison to an end-fed wire of similar length and similar orientation (note 'similar' not 'same') it was overall no better and no worse. If you feel the need to 'categorize' what it is then call it a hybrid trapped sloper - though AD might be upset for referring to their 'ISO-RES' coils as traps. The Answer May Be : el-if-i-no ![]() . . iane ~ RHF . All are WELCOME and "Invited to Join" the Shortwave Listener (SWL) Antenna eGroup 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 !" . . . . |
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