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The Japanese also love the Wellbrook loops
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The Japanese also love the Wellbrook loops
Hello.
Nice pictures - thanks for the link. It makes sense for this antenna to be popular in Japan - their homes (and lots) are relatively small and close together. Plus, with the Japanese' love for electronic equipment, I should expect that there is lots of local electrical noise present in many locations. These Wellbrook antennas are ideal for such situations and their performance at the very least rivals, and in many cases, especially during the summer, exceeds that of longwires. Back in 2005, Andy Ikin had so many orders from Japan (as well as from Ibiquity - for use with AM IBOC [HD] radio) that there was a very long wait for orders to be filled. Though the pictures show the ALA 1530, which is designed primarily for optimum MW reception with SW reception being somewhat secondary, the ALA 330S, designed for optimum SW reception, especially on the higher frequencies, looks just like it. (I own two of them.) In my opinion, for "real-world" SW listening, there is none better. Best, Joe wrote: Some nice photos: http://ala1530.hobby-web.net/user.html |
The Japanese also love the Wellbrook loops
Joe Analssandrini wrote: Hello. Nice pictures - thanks for the link. It makes sense for this antenna to be popular in Japan - their homes (and lots) are relatively small and close together. Plus, with the Japanese' love for electronic equipment, I should expect that there is lots of local electrical noise present in many locations. These Wellbrook antennas are ideal for such situations and their performance at the very least rivals, and in many cases, especially during the summer, exceeds that of longwires. Back in 2005, Andy Ikin had so many orders from Japan (as well as from Ibiquity - for use with AM IBOC [HD] radio) that there was a very long wait for orders to be filled. Though the pictures show the ALA 1530, which is designed primarily for optimum MW reception with SW reception being somewhat secondary, the ALA 330S, designed for optimum SW reception, especially on the higher frequencies, looks just like it. (I own two of them.) In my opinion, for "real-world" SW listening, there is none better. Best, Joe wrote: Some nice photos: http://ala1530.hobby-web.net/user.html I noted Wellbrook added a higher bandwidth version of the 1530, going right up to the FM broadcast band. I know someone who ordered one, so I'm waiting for some feedback. If you have the ALA-100, which allows for more "wire" than their loops, I seriously doubt there is ever a time when a long wire is better. My radio switches in an attenuator for some local AM BCB with my ALA-100 that has about 60ft of wire. |
The Japanese also love the Wellbrook loops
In article
, Telamon wrote: In article .com, wrote: Some nice photos: http://ala1530.hobby-web.net/user.html If those are metal masts going through the loop area that is not a good idea. I understand the desire to provide the support for the loop mechanically but the metal mast will screw up the loop performance. A non-conductive mast should be used. All of those loops do not look like Wellbrook antennas. -- Telamon Ventura, California |
The WellBrook Active Loop Antenna ALA 100
Miso,
With the larger WellBrook ALA 100 Loop Antenna you are generally limited to a Fixed Position and therefore can not use it to Null-Out the Local Noise. The WellBrook Active Loop Antenna ALA 100 is a Large Aperture Antenna designed to provide improved performance compared to traditional Active and Passive Antennas. http://www.wellbrook.uk.com/ALA100b.html http://www.wellbrook.uk.com/products.html#ALA100 -Note- At Sixty Feet (60') of Wire a Loop Antenna is a relatively Long Wire Antenna in the Shape of a Loop. :o) HORIZONTAL OR VERTICAL : Will the WellBrook Active Loop Antenna ALA 100 work as well Flat {Horizontal} as well Upright {Vertical} ? ? ? TWIN LOOP ANTENNA ELEMENT : I have consider the possibility of using a WellBrook ALA100 that would be suspended up 25 Feet from a Tree Limb. The Loop would be a Diamond Shape with a Ten Foot (10') pieceof PVC Pipe as a Cross-Arm using Two continous 30 Foot Wire Loops spaced at about 18 Inches apart. This would allow the Loop to be Manually Positioned to Null-Out any Local Noise or to Point the Loop in the general direction of a Target Signal Area. interesting - iane ~ RHF |
The WellBrook Active Loop Antenna ALA 100
GA,
You may wish to consider the Size and Spacing parameters of a T2FD Antenna as a guide in determining whether as the "Design" Frequency effects the Spacing between the Turns as the Frequency gets Higher or Lower * The Formulas for Calculating T2FD Dimensions are as follows. http://www.hard-core-dx.com/nordicdx.../t2design.html Generally the Distance between the Turns {Spacing} will get Wider as the Frequency gets lower. - But you already knew that :o) T2FD -- The Forgotten Antenna -by- Guy Atkins http://www.hard-core-dx.com/nordicdx...wire/t2fd.html I would think that starting with the Sixty Feet Single Turn WellBrook ALA100 Loop Antenna that the progression form One to Two Turns to Three Turns . . . would require increased spacing for each added turn to maintain a certain band width. One-Turn with Sixty Feet Perimeter with 15 Feet per Side of a Square/Diamond. - - - Resulting in a Very Thin Loop Antenna that is about 22-Feet Top-to-Bottom and Side-to-Side. Two-Turns about Four Inch Spacing with Thirty Feet Perimeter with 7.5 Feet per Side of a Square/Diamond. - - - Resulting in a Three Inch Thick Loop Antenna that is about 11-Feet Top-to-Bottom and Side-to-Side. Three-Turns about Six Inch Spacing with Twenty Feet Perimeter with 5 Feet per Side of a Square/Diamond. - - - Resulting in an 12-Inch Thick Loop Antenna that is about Seven Feet Top-to-Bottom and Side-to-Side. Four-Turns about Eight Inch Spacing with Fifteen Feet Perimeter with 3.75 Feet per Side of a Square/Diamond. - - - Resulting in an 24-Inch Thick Loop Antenna that is about 6 Feet Top-to-Bottom and Side-to-Side. The smaller more maneuverable Loop Antenna becomes increasingly Thinker in order to maintain the same Band-Width for the Loop. at least that is the way i envision them -iane ~ RHF |
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