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Scaling of Yagi design
The elements are mounted approximately 3mm off the boom by nylon
insulator blocks on the original design. The scaled design will use same construction. http://www.qsl.net/dk7zb/start1.htm Tom Ring wrote: David wrote: Hi, I have a design for a Yagi antenna at 436MHz and would like to scale it to 921 MHz. The calculations I used from the understanding I have obtained from reading various articles appears below. Would someone be kind enough to advise me if this procedure and values look correct ? Thanks in advance. The original dimensions(mm) were Boom = 15 or 20mm square aluminum, 350mm long Element Length Spacing Diameter RE 336 0 8 DE 316 80 10 D1 300 190 8 D2 292 330 8 My scaled values to 921MHz Boom = 12mm x 12mm aluminum 166mm long Element Length Spacing Diameter RE 158.9 0 3.78 DE 149.5 38 4.73 D1 141.9 90 3.78 D2 138.2 142 3.78 Now I scaled the tubing to 6mm diameter that I have in stock Element Length Spacing Diameter RE 158.5 0 6 DE 148.7 38 6 D1 139.4 90 6 D2 135.3 142 6 Regards David Huisman Are these through the boom, and if so, insulated, or uninsulated? If not through the boom, give specifics on the mounting. Please do this for both the original antenna, and how you propose to build the scaled one. tom K0TAR -- Kind Regards David Huisman General Manager ----------------------------------------------------------------------- ORBIT COMMUNICATIONS Pty Ltd - Wireless Solutions that Work (Telemetry, Control, Monitoring, Security, HVAC ...) A.C.N. 107 441 869 Website : http://www.orbitcoms.com PO Box 4474 Lakehaven NSW 2263, AUSTRALIA Phone: 61-2-4393-3627 Fax : 61-2-4393-3685 Mobile: 61-413-715-986 |
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