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The coming hf signal reflects from ending point and there forms so called standing wave when incoming and reflecting signals in different places are either weakening or amplifiering each others: Lg is standing wavelength inside the tube, it is function of both Lo and LcĪ waveguide which is closed on the other end acts similar as a short circuited coaxial cable. Lc is the wavelength of the low cut frequency which depends on tube dia only Lc = 1,706 x D Lo is the wavelength of the hf signal in open air or Lo/mm = 300 / (f/GHz). There are three different wavelengths in the waveguide tube.
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This second test on Saturday May 30th was much better, we tested at signal strength of 79.ĭecoration supplies needed: ( fortunately I had supplies on hand already)īecause the Super Cantenna has linear polarization, you may find that you get a better signal by rotating it slightly clockwise or counterclockwise on the tripod along its cylindrical axis.Ĭantenna/antenna technology: ( I found this on a site, obviously understand just fraction of what it’s explaining). So, we remove the second can and retested. The next day, Saturday May 30th we had add an additional 48 oz can to lengthen the cantenna in the hopes it would strengthen our signal, unfortunatly this did the opposite the signal was 88 at 310 feet. I tested our cantenna on Friday May 29th and the test result was a signal 75 at around 310 feet. Removed second can because it caused the signal to worsen (more noise).Added additional 48 oz can and Taped together with metal duct tape, to see if we could get a stronger signal (less noise).Measured diameter of can and measured for placement of pilot hole for radiator.Masked off the radiator, and painted the can.Drilled the 5/8 inch hole in the can with a drill press.Used a center punch to mark the correct point to drill, and used a small file to create a pilot hole.Since it was difficult to determine in where 1.63 inches, I found a calculator online that would convert inches into centimeters. Measured the diameter of the can inches and used the site Rudy provided to calculate the proper placement of the hole for the radiator.Remove one end and clean thoroughly, and removed the label.Purchased a 48 oz can of Safeway’s Chicken Broth.Researched various websites to help determine the ideal dimensions of a can to receive optimal signal strength.Between the extra bottom and original bottom there becomes a space with no need. It is not necessary be tight, microwaves are not passing through narrow slots. How it is mounted inside the can there are countless means. It can be made from tinned steel or aluminum which is cut according inside diameter of the can. If the bottom of the can is not smooth a extra bottom can be added inside the can. Interesting suggestion: (might have tried this variation if I’d found it in time) Distances of hole from bottom 1.63 inches or 41.1 mm.1 Pigtail (N-type male to your style jack).One N type female RF connector ( radiator).