Locked 1044-Foot Loop
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I've been away from this subject and this group for a long time. I am building a new house and I am now planning a loop. |
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Hello Frank I just found your note about a dog-toy launcher-device and wonder how far/high it can lob a weight and throw-line. website for it ? Thanks for additional info. 73? Dick/w7wkr at CN97uj On Sat, Feb 25, 2023 at 1:20?PM Frank Sweeney via <k9ic_repeater=[email protected]> wrote: The length and height sound good |
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Murray
I have one for 160 m. I feed it with ladder line to 1 to 1 balun then coax to the inside of the house. my favorite antenna. Mine is only have 20 feet and does well on 160 in the USA. On the upper bands it is very directional being fed from the corner to the opposite direction which is to the south east of the United States from the northwest. On 10 and 12. I think it acts like a rhombic . |
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Frank,
Though Bob's youtube presentation is interesting, it is way overkill for my situation. The difference for my situation is I have lots of? tall, skinny evergreen trees. The problem with these trees is they have too few branches at lower heights. The branches they have start at about 50 feet high. But this is good in the sense that the branches and foliage don't get in the way of a slingshot. I have many times used a manual slingshot with fishing line reel attached to place a light fishing weight connected to thin line where I wanted it. It does take time, and patience, and repeated shots to get it right. You also must use a light weight and very thin line. Subsequently, once the weight reaches where you want, you pull up thicker and thicker rope over repeated pullups.? Murray VE7RC |
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Pat,
Interesting that you find yours works well at 20 feet high. This doesn't surprise me. Modeling shows how different the performance of loops can be at different heights. According to EZNEC, a higher fixed loop isn't necessarily better. The main lobe shape and maximum angle of radiation are very different depending on height. And unlike a good rotatable beam, with this type of fixed loop you want as omnidirectional as you can get. I notice in the model the directionality you mention. With a two wavelength loop at 160 metres results will likely differ from what you find. In my case, the best direction is going to be in the SW through W direction. This is OK since I'd like to focus on the Pacific and Asia directions anyway. I figure I should be able to hear and work US/VE stations regardless. If I found Europe and Africa just weren't being received, I could go crazy and install a similar smaller loop in the other direction to favour the east. Also, I think modeling of this type of antenna only goes so far. Trying one for real will tell the tale. Murray VE7RC |
VE7RC
Dick Bingham
Pat