Strong Signal for USB Modem from long distance:- My Archampatti Village is away from Trichy (India) 3G tower (15KM). With out this Dish i got only 0 to 17% Signal. But after my dish i am getting constantly 91 to 99% Signal.
Recently i have tested with this device 30Km away from 3G tower. i got 1 or 2 towers (10% to 24% Signal) with out signal drop. This is very good device for outside City users, Especially arts and engineering colleges away from city limit.
How to made:
This is a very simple Parabolic reflector tech.
Take any curve vessel from your kitchen (Minimum 1ft Diameter), check the below calculation to fix your 3G dongle.
D is the diameter of the dish, d is the depth of the dish and f is the focal distance.
d = ((D/2) *(D/2)) / 4f
here we need to calculate f, f means where we need to keep your USB 2G/3G/4G modem.
f = (D*D) / 16d
The above formula helps in positioning the feed of the parabolic antennas as it gives the focal distance f. Of course in practice the shape of the dish is not a perfect parabola and therefore small adjustments are needed when positioning the feed.
Which gives a relationship between the diameter D, the depth d and the focal distance f of the dish.
Big Dish will give you good performance. Keep your Dish in to 3G tower Direction.
By Rajesh Natarajan (
[email protected]).
