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, ,,,,,,,,, , , 24 ' FOCAL PLANE , , , , , ,,, , ,,,,,, AX IS 'A' -e- 'v" 2~A~67ell ' .' ~ DE PT H -I Fig. 2. Details for making full-size construc tion pattern (top half of the parabola graph). Construction Materials '12" x '12 " X Va " Tee-shaped aluminum strips Small nuts and bolts or "pop rivets" 3-inch pipe flange V." mesh wire (hardware cloth) or aluminum window screen - enough to cover the reflector. Aluminum tubing, 'I." o.o. x 19" long Aluminum tubing, 718" o.o. (3,4 "l.d.) x 3" long Aluminum sheet, l&gauge, 4" x 4" Aluminum strips (2), Yz" wide x 8" long Aluminum strips (4), 16-gauge, 1" x 6" Aluminum strip, 16-gauge, 1" x 2W' Aluminum tubing, '/z" x 36" Aluminum tubinq, 1f2 " x 23" 1 u-bott clamp (10 flt 7/6" pipe) 1 If-bolt clamp (to fit lower leg) several feet of aluminum wire (clothesline Wire), small gauge " ( " 3" HUB ~C HTRA ." BRAC~S R'BS (8) Fig. 3. (a) Rim dimensions. (b) Spoke installation. (c) Octagonal bracing placement. (d) Ins tallation of extra rib braces. '" 4 " 4' CUT o~ DoTTED ~ I N E S the pl ea sure of testing some t hing that worked right the first try. I was fo r tunate enough to have a Gunn diode oscillato r o perating at 10,5 GH z and the wa veguide-horn fro m an old po lice radar detector. The Gu nn oscillator was set up facing the waveguide detector at a d istan ce of te n feet and the meter readin g was noted. The Gunn oscillator was then pointed at the mouth of the dish, and by stan ding to one side and moving the detector around, I was able to locate t he point of highest rf co nce n tration. This poi nt was 26 Vl" from the vertex of the dish, on ly a half-i nch off the design and now the meter read fu ll sca le (100 microamperes). This was mu ch greater than the direct reading without the d ish, ind icating a great deal of ga in. The Gun n oscillator was the n moved to a point three feet from the front of the dish and the detector was used at the rear of the dish to check fo r rf leakage through the mesh cover. None could be detected. This wou ld seem to indicate that spacings greater than Y4" could be used for freque nc ies below 10.5 GHz. Miscellaneous The pipe-fla nge center hub ma kes horn attachment easy. You may wish to thread a short pipe nipple into the flange and slide a piece of aluminum tubing or Pv'C plastic over the nipple to mo unt the horn. You can clamp the two together with screw-type pipe clamps or hose clamps. STRAPS AROu "O TOIII~R ~~" 112" ALUM ,"uM TUB I~" H" LO"" ' / 4' A~UMINUM :"~~~::::-'SUPPORT FRAME "--'--TOIIIER L~GS ,OP vir.. Fig. 4. Supporting and mounting construction details. Conclusion If you should bu ild a parabolic reflector from the solar book information given, 1 bel ieve that you will be well pleased with the results, I certain ly am. I have become so interested in the design of dishes that I have completely dropped the MDS project and I am presently contemplating a 12 footer for satel lite reception. Good luck.• 92 73 Magazine· April,1981
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