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#1
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Alpha Delta - Balun or not?
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 |
#2
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Alpha Delta DX-SWL Shortwave Sloper Antenna - Use a Balun or Not ?
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} |
#3
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Alpha Delta - Balun or not?
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? Please explain just why you think adding a 10:1 balun would 'maximize efficiency' of this particular antenna. I'd be interested in the theory behind this. dxAce Michigan USA |
#4
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Alpha Delta - Balun or not?
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 A BalUn is not needed as no part of the system is balanced. A ten to one transformer is not needed as the antenna is already sufficiently matched to the feedline. |
#5
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Alpha Delta - Balun or not?
On Fri, 23 Nov 2007 23:48:01 -0500, "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 Here is a good write up regarding the Balun from the ARRL ---- http://www.arrl.org/tis/info/pdf/8004019.pdf |
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