3G Network Modem Signal Amplification Testing With Parabolic Pan

Fajar Purnama
10 min readNov 22, 2020


Previously, this paper had the aim of fulfilling the requirements to take part in the 2013 UNUD MawaPres (Outstanding Student) where this paper was the second version of the selection at the University level which was different from first version where the first version only hangs the modem on the pan while the second version makes bazooka parabolic pan product where there is a place to put the modem and I translated the original Indonesian to English myself. The story of why I chose this topic because there was no smartphone before and still used a modem (modulator demodulator) for Internet connection. In the past, I was often invited to play online video games like DOTA (Defense of the Ancient) but had problems with Internet connection stability (not Internet connection speed). An easy way that I have come across to improve the quality of the modem signal is to use wajanbolic (parabolic pan) which I often tinker with and ideas arise about why not just write a paper on this. This paper has never been published anywhere and I, as the author and copyright holder, license this paper customized CC-BY-SA where anyone can share, copy, republish, and sell on condition to state my name as the author and notify that the original and open version available here.


The issue of a homebrew antenna made from a parabolic frying pan, a cylinder box and aluminium foil that could increase the gain of a modem (increase in signal strength) had been wide spread throughout the citizen. In Indonesia we called it wajanbolic, in English it is a homebrew parabolic antenna. But there hasn’t much people who knew the exact number of the gain and theorically how it could increase the signal strength of a modem. In this paper will be discussed the exact number of the gain and why it could increase modem’s signal strength. The advantage of this paper is the benefit for people from any class (especially low class) because they could make this device easily and quickly with cheap materials and easy to grasp.

The materials that were used to make this device for this paper are a frying pan with a diameter of 30 cm and a depth of 10 cm as a parabolic reflector, a cylinder box with a diamter of 10.8 cm and a length of 26.6 cm as the feeder (feed antenna). Above the focus point (5.626 cm) is covered with aluminium foil. The modem is place 1/3 the length that was covered in aluminium foil from the top. The making of this…

Fajar Purnama

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