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Nairaland Forum / Entertainment / TV/Movies / Satellite TV Technology / (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now (136813 Views)
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Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 7:11pm On Jun 01, 2011 |
geometry: @ geometry and swordswifter thks very much i will look into it, plz i need your mail so that we can talk better. here is my temporary mail. 5qAenHbblXIZ@meltmail.com |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by dodos(f): 12:53pm On Jun 02, 2011 |
@ geometry good work and good illustrations. I enjoyed recollecting my elementary math. Now concerning the depth of the dish, how can you measure in order to avoid errors. In other words one would have to measure from the center (in the middle) of the base of the dish to edge of the dish. Am thinking of using a thing thread from one end of the tip of the dish to the other (as if measuring the diameter) and then putting a stick in the base of the dish up to the thread. Is this how to go about it. If yes how can one ensure that the stick is in the exact middle of the dish. What else can one do to eliminate or minimize errors as much as possible. Hope my question is self explanatory Thanks |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 10:02pm On Jun 02, 2011 |
dodos: @dodos, yes you are right. just tie a rope from one edge to the other and measure it with a tape rule. and get ur depth |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 10:23pm On Jun 02, 2011 |
@ geometry and swordswifter, here is the parameters of ma 3.2m dish: DIAMETER:320CM (3.2M) RADIUS: 160CM (1.8M) DEPTH: 52CM (5.2M) LOOK INTO THE PARAMETERS AND TELL ME WHAT TRIPOD SIZE TO USE FOR MY 3.2M FIBER DISH THKS @ geometry and swordswifter |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 1:07am On Jun 03, 2011 |
@ Newtonn, ur tripod = 167.6cm long. ur focal lengh = 123.1cm. Goodluck ! |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by lovala(m): 1:39am On Jun 03, 2011 |
@ geometry and swordswifter, @Newtonn: Your radius is 1.6m and depth 0.52m. Recheck! |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 7:38am On Jun 03, 2011 |
@ lovala,, you are right ! @ newtonn, you wrote 160cm then bracketed 1.8m. But then, since you said your dish diameter is 320cm right from time, i assumed your your bracketed 1.8m is meant to be 1.6m. Plz, comfirm it. |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 11:07am On Jun 03, 2011 |
geometry: yes you are right, i did a mistake it's 1.6m and the depth it's .52m. thks |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 4:19am On Jun 04, 2011 |
@ all, Measuring Dish Depth: the rope method is good, but you need the point on the rope to measure to. Thats the mid-point on the rope which is now the apertural center of your dish, i.e, the effective surface area. Invariably, the distance between the marked point on the rope and the center of your parabola (dish) is your depth. Now let's method another method. 'STIFF PIPE METHOD' most tripods come in 1/2" light square pipe, before cutting measure out your diameter, mark out the two endsthen, the mid way which is your radius. Place the two ends on the rim (edge) of your dish such that it divides your dish into two equal halves. This is obtainable by making sure your two end marks coincide with the two opposite points on the edge of your parabola (dish). The simplest way to archive this is to, first of all, measure your diameter with a tape and then transfer over to your yet uncut square pipe. Latter we will discuss TWO-TAPE-METHOD. |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 4:38am On Jun 04, 2011 |
Plz, remember to mark the middle after transfering your measuement over to 'STIFF' square pipe. Cheers. |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 5:30pm On Jun 04, 2011 |
@ geometry and swordswifter, is it true that 3.2m dish cant show ABUDABI stations? a friend told me so |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by dodos(f): 9:21pm On Jun 04, 2011 |
geometry:@ geometry and sword Can you please explain how you came by the above. Secondly are all c-band lnb holders the same size. Thanks for your patience |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 9:25pm On Jun 04, 2011 |
dodos: http://mscir.tripod.com/parabola/ @dodos download the software from that site, use it to calculate ur focal point of any parabola dish,,,, and enjoy
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Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 9:33pm On Jun 04, 2011 |
dodos: @dodos, the formula of the focal point of a parabolic dish is diameter squared divided by 16 xdept. so if the diameter is 320 cm that is squares =102,400 depth is 52 cm so 52x16 =832 so 102,400 cm divided by 832= 123.07 cm @ALL i just use my dish as an example, so if you are dealing with bigger or smaller dish input ur parameters. ralph |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 9:41pm On Jun 04, 2011 |
geometry: @geometry, take a look @my formula. the formula of the focal point of a parabolic dish is diameter squared divided by 16 xdept. so if the diameter is 320 cm that is squares =102,400 depth is 52 cm so 52x16 =832 so 102,400 cm divided by 832= 123.07 cm check all the software use for calculating focal point ralph
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Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by swordswifter: 9:47pm On Jun 04, 2011 |
Hi all, I'm announcing that The home made dish making adventure i embarked on which i nicknamed THE PROJECT with the help of a couple of friends since last year is now finally complete.Preliminary testing showed strong echoes arriving at the focal point.Actual testing will start tomorrow 8am local time at the Ghana Telecom University College campus-Tesano and as usual pictures will be posted afterwards.Dodos,Sathob,Salamander and other active nairalanders living in Accra are free to come and support.Thanks! FTA-We will push the limits. 2 Likes 1 Share |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 9:52pm On Jun 04, 2011 |
swordswifter: am happy 4u, keep da good work ralph |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 7:48am On Jun 05, 2011 |
@ Swordswifter, that's what i'm talking about ! You are great ! Now that you are breaking the ice, let's go ! I strongly anticipate other members of this members to emulate this move of yours. I'm waiting for your results. Goodluck. What size is THE PROJECT by the way ? |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 7:51am On Jun 05, 2011 |
Members of the floor i meant. |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by swordswifter: 8:49am On Jun 05, 2011 |
geometry:@Geometry It's 244cm in diameter but i know with time due to expansion and cooling it will reach 250cm. If all things are to go as planned these are the parameters we are expecting: Frequency 11296 MHz Diameter 2440 mm. Depth 150.00 mm. f/D 1.01666666666667 ------------------------- f/D = 1.02 Focal Length = 2480.67 mm. Illumination angle for feed = 55.3 degrees Space attenuation = 0.51 dB Desired taper = 9.49 db for 10 dB edge illumination A simple feed horn would have a diameter of 2.12 wavelengths for a 3 dB beamwidth of 31.07 degrees Gain at 50% efficiency = 46.20 dBi |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Eltonluigi(m): 9:29am On Jun 05, 2011 |
^^^i still miss d size of 'The Project' dude plz put it in plain or simple english, nice work tho'! |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 9:43am On Jun 05, 2011 |
@ dodos & all, There is a standard for lnb holder size, i.e, where holes are drilled, generally, this gives precise idea of what parameters to base your calculations of tripod length. That is why i stated in the previous post to go by 'actual' and not 'theory'. There is slight defence between the results from both instances. Check out the post with illustrated diagrams. |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 10:02am On Jun 05, 2011 |
@ newtonn, the post with illustrative diagram is sort of self explanatory. I distinguished the 'theory' from 'actual'. |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 10:23am On Jun 05, 2011 |
swordswifter:@swordswifter, keep da spirit high, we are waiting for your results including with the pictures and shot screen of quality ralph |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 10:44am On Jun 05, 2011 |
swordswifter:@swordswifter, kindly mail me on my temporary mail, its has only 5hrs to melt. email: 9a1seUhoPX97@meltmail.com thks |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 4:33pm On Jun 05, 2011 |
@ swordswifter, i guess your dish is kinnda' too flat for acceptability. the acceptable range i know for f/D ratio range is 0.3 through 0.7 , for [TVRO] (Television Receive Only), yours might be a kind of push to the edge and i hope it works for you. i 'l like to see your result for comparison, and maybe what you have supersedes the previous records. it could be a land mark, but then i'm afraid. let's hope yours is a landmark success. plz, feel free to let us have your results. thank you. |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 4:41pm On Jun 05, 2011 |
@ swordswifter, from your parameters and properties, your dish seems to be made of metal, i believe that answer the reason for the magnitude of your f/D ratio, 1.02.[ very high] 'fabrication convenience' !. then, if i may ask, how many sections, if you are working on a metal dish. plz, let me know, it might help. goodluck ! |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 7:53pm On Jun 05, 2011 |
geometry: @geometry, you are very right, coz when i checked it from my software, its very flat and d depth not deep ralph |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 9:00pm On Jun 05, 2011 |
@Geometry, pls check my observation. thks
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Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by Newtonn(m): 9:02pm On Jun 05, 2011 |
@Geometry, take a look at the program, left side corner says linear diameter? what does it mean? thks |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 3:19pm On Jun 06, 2011 |
@ newtonn, your observation is accurate, that's the essence of designing, simulating and re-designing. All of these are important in science &engineering. (theory). The linear diameter is what i call 'PARABOLIC ARC'. : You can say your curve length. You can verify this by real curve fittings on a piece of paper adopting an adequate scale. Then, use graduated french curve to measure out the curve and multiply by your scale. Compare your result with that from the software. They must be the same or with a neglegible variation. |
Re: (diy) Design And Fabricate Your Own Satellite Dish Of "all Sizes", Ask How.now by geometry(m): 3:31pm On Jun 06, 2011 |
@ swordswifter, you care for a chat ?. I will be happy to talk to you. Personally. Thank you. |
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