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Yes. Played with vertically polarized single element delta loops and quads in the early '90s on 11m. Worked much of Europe and many post-soviet states using them with relatively little power.. whatever the Jumbo 3 peaked out at, think mine was about 15W. Conditions were great then though, so probably not all just down to my antenna creations For local seemed about as good as the silver rod I had at the time, but a bit directional.
Posts : 4 Times Thanked : 0 Join date : 2019-07-03
Subject: Re: Delta loop for CB. Fri Apr 30, 2021 9:53 am
It will work well. Quads and delta loops are excellent. If you are just using a single full wave loop it will have an impedance of around 200 ohms, not a brilliant match to your 50 ohm coax. So you may want to make a 4:1 balun. You may get away with half a dozen turns of coax about 8" in diameter to choke off the current from the coax outer braid. Remember that a quad is a balanced antenna and coax unbalanced. Unless you choke off the radio frequency current from the outer braid of the coax you will radiate from and receive from the coax. Not good.
You can arrange the delta loop for horizontal polarisation by feeding it in the middle of the bottom of the triangle or vertical polarisation by feeding it a quarter wave (2.7m) from the top down one side of the triangle - in other words a short way up the side leg. If most of your contacts are with locals using verticals this will work better.
I used to have an 80m amateur band delta loop which worked amazingly and have built quads before and they always work well.
I just noticed that you have a feedpoint "box" there, which should hopefully be that 4:1 matching transformer
Posts : 186 Times Thanked : 6 Join date : 2019-06-29
Subject: Re: Delta loop for CB. Fri Apr 30, 2021 11:38 am
I have a homemade Deltaloop ( somewhere ) I designed it for 50 Ohm impedance on the 10M band , the frame was in the form of a "T" with the bottom sections of a windjammer 10m fibreglass pole as the vertical part and a 3m length of 20mm pvc conduit ( stiffened by a 1.5m long bit of fibreglass tube at center) and made with 1.5mm insulated copper wire , top bit of wire was 2.96metres I think with rest of loop going down each side to feed point , so short on top with longer sides, with an air choke at feed point. Horizontal polarization with some gain over a vertical at usefull DX angles 5>9 degrees take off, feed point was only 3m off ground but worked well.