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Need help with antenna decision/ 70' mount
I currently am using an Alpha Delta DX-Ultra mounted at 70' sloping to
about 15 feet above ground. This antenna in this configuration is noisy. I am considering an Alpha Delta DX-SWL or maybe a vertical antenna. I know the height is a bit much, but the higher it goes the more antenna I can get on my property. I even used this antenna in an inverted "V" configuration with much noise. So if you had an area you could easily mount an antenna 70' in the air what would you go with that would not be noisy. I like to have this antenna work on the tropical bands. This antenna is suspended from a tree using a pulley system. Thanks to all If I find a solution the DX-Ultra will be sold...anyone interested? |
Mike wrote: I currently am using an Alpha Delta DX-Ultra mounted at 70' sloping to about 15 feet above ground. This antenna in this configuration is noisy. I am considering an Alpha Delta DX-SWL or maybe a vertical antenna. I know the height is a bit much, but the higher it goes the more antenna I can get on my property. I even used this antenna in an inverted "V" configuration with much noise. So if you had an area you could easily mount an antenna 70' in the air what would you go with that would not be noisy. I like to have this antenna work on the tropical bands. This antenna is suspended from a tree using a pulley system. Thanks to all If I find a solution the DX-Ultra will be sold...anyone interested? If you mounted that antenna in different configurations and you still had noise, then you probably do not have an antenna problem but a noise problem. Investigate that before you try anything else. dxAce Michigan USA |
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= = = (Mike) wrote in message
= = = . com... I currently am using an Alpha Delta DX-Ultra mounted at 70' sloping to about 15 feet above ground. This antenna in this configuration is noisy. I am considering an Alpha Delta DX-SWL or maybe a vertical antenna. I know the height is a bit much, but the higher it goes the more antenna I can get on my property. I even used this antenna in an inverted "V" configuration with much noise. So if you had an area you could easily mount an antenna 70' in the air what would you go with that would not be noisy. I like to have this antenna work on the tropical bands. This antenna is suspended from a tree using a pulley system. Thanks to all If I find a solution the DX-Ultra will be sold...anyone interested? MM, Remove (Take-Down) your Alpha Delta DX-Ultra (ADDXU) Antenna. Run /Route a Coax Cable from your Radio to a "Spot" at the 'base' of the Tree (Top Tie-Off Point) -or- the Bottom Tie-Off Point of your ADDXU; which ever is closer to your Radio's location. At this "Spot" install a Ground Rod and Wire. Buy a SWL Matching Transformer (Balun-UnUn-MLB) and 'mount' the MT on the Ground Rod. Buy some Wire for an Antenna Element. (Chose One) - Run/Route the Wire UP the Tree and (Sloping) DOWN to the Bottom Tie-Off Point and secure it. [ Think of this as a Vertical-Fed "7" Laying on it's Side ] - Run/Route the Wire UP (Sloping) to the Tree Top Tie-Off Point and secure it. [ This a common Bottom-to-Top "Sloper' ] - Run/Route the Wire UP (Sloping) to the Tree Top and DOWN to a near-ground Tie-Off Point at the base of the Tree and secure it. [ Think of this as a Sloper-Fed "7" Laying on it's Side ] Connect the Wire Antenna Element; Ground Wire; and Coax Cable to the Matching Transformer. NOTE: Since you state that you are having High RFI/EMF Noise Levels. You may wish to consider "Burying" your Coax Cable Feed-in-Line from the Antenna to your House. OR - You may wish to consider a Feed-in-Line Isolator (1:1 Matching Transformer) at the point that your Coax Cable enters your house. A second Grounding Point (Ground Rod) could also be used here. INFO - Low Noise Antenna using the Universal Magnetic Balun and the Antenna Feeder Isolator - by Wellbrook Communications http://www.wellbrook.uk.com/longwire.html DIAGRAM - The Correct Way To Install A Longwire Antenna/Balun READ - Antennas - Five Things to Consider : Antenna, Balun, Ground, Coax & Planning http://groups.yahoo.com/group/Shortw...a/message/1544 ABOUT - The Alpha Delta DX-Ultra (Dipole) and DX-SWL (Sloper) Antennas http://usa.shortwavestore.com/shortwave-antennas.html http://www.alphadeltacom.com/pg1.htm Installation Instructions - Alpha Delta DX-Ultra (Dipoles) Antennas http://www.alphadeltacom.com/dxlb_ii.htm http://www.rys.nl/dxultra.html Alpha Delta DX-SWL (Sloper) Antenna http://www.alphadeltacom.com/pg7.htm Installation Instructions - Alpha Delta DX-SWL Antennas http://www.alphadeltacom.com/dxswlii.htm Optimum 'mounting Height of 25 Feet (Top) with the Bottom-End at 8-9 Feet above ground. http://www.rys.nl/addxswl_ii.htm Quarter Wave Length (1/4WL) Slopers - Here's How to Do it RIGHT ! Wanna Work Some GREAT Low Band DX in Limited Space Area ? http://www.alphadeltacom.com/qw_slopers.html Which is Better ? The Quarter Wave Length (1/4WL) Sloper Antennas or the Inverted "V" Dipole Antennas - presented by Alpha Delta Communications Inc. http://www.alphadeltacom.com/pdf/slo...inverted_v.pdf iane ~ RHF .. 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 ! .. .. |
"dxAce" wrote in message
... If you mounted that antenna in different configurations and you still had noise, then you probably do not have an antenna problem but a noise problem. Investigate that before you try anything else. dxAce Michigan USA I agree. Search out the noise sources and eliminate them if possible. The antenna you have has many good reviews, I don't believe it is the problem. Al KA5JGV San Antonio, Tx. |
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