Before begin. Where i stay is a rural area., cell phone signal reception is a nightmare. 1 bar or no service, the best i can get is 2 bar. After a long searching for a solution, trial and error. Discover this simple solution without purchased a expensive 3G signal booster. Here the guide to build one from household items.
DIY 2G/3G/4G wireless cell phone signal booster is a home-brew booster which uses common household items. This DIY can improves the signal of cell phone signal inside your house, from 1 bar to full. You need to build 2 unit, one indoor, one outdoor, both unit is similar and simple to build if you follow this guide, but i take few hours to R&D. I name it, LauC2 antenna. Before we start, safety first wear protector eye glass and safety gloves. When you see the bold text, is special for people want details instruction. This project can build using material you can found, finished LauC2 antenna have to 80% like the photo. Primary objective is E GSM 900, 2G signal reception. You need at least have cell phone signal coverage at outside your house for this antenna to function and working, 1 bar signal strength or come and gone.
Use the phone as usual, not wired. No wire connected to your phone.
USE AT YOUR OWN RISK
First get all this items from your house :
You can found all this items at your nearby supermarket, hardware shop.
Look at the drawing. First section we going to build is the 3G antenna using the iron wire from the clothes stand /wire coat hanger, the black color drawing. Not necessary to remove the paint coating.
Straiten the clothes stand wire / wire coat hanger with pliers [ i using hand ] and bend it 4cm at the corner about 45 degree.
All wire is connected inside the connector block. The 4cm area, clean/remove the clothes stand / wire coat hanger shield [paint coating]. You have to use the wire cutter to cut the wire. Build 2 unit. One clothes stand enough for building 2 unit this kind of antenna. Maybe take you 1-2 hours or less.
Next step is the wireless antenna, the orange and yellow drawing. This section we need to use the common cable TV cable. So first cut off the plastic jacket about 15-20 cm length, depend on the center core round / turns , if you planning for testing the center core round / turns, maybe good idea about 20cm. depend on the center core round / turns diameter. Now you can see the [metallic shield] like a spider web, cut off this metallic shield and look at the drawing again, the red line is the metallic shield to be installed. No waste. Just twisted down the metallic shield become a wire without cutting [cut it if too long ]and fit into the connector block at the red line and tighten, not necessary a U shape. Then back to the cable, cut off the dielectric insulator carefully, we need the center core for building the wireless antenna.
Back to the drawing again. About 5cm from the edge of the center core [ or start at plastic jacket edge depend on the length of center core ], we need to make 5 round / turns clockwise, E GSM 900 2G, we can do it using screw driver [ 3-6 mm phillips screw drive ], just bend the center core round and round / turns on the rod. Then straight the center core both area like the photo. Now we need to mount this wireless antenna to the 3G antenna. Look at the drawing how this done. Remember the edge of the center core wire have to joined the iron wire and tighten. Do not forget the red wire.
After some testing, B1-WCDMA 2100, 4G have to be center core 7 round /turns at outdoor unit, and center core 5 round / turns at indoor unit. Use your smartphone searching for the location have STRONG 4G signal to put the outdoor unit.
A good signal strength define is maybe a stable 3 bar 2G signal, not a unstable signal strength jump up and down too often. Probably take a while for getting the right place.
If you not very sure, just make it 7 round /turns at out door unit and 5 round /turns at indoor unit. If the signal strength still too weak, you can trial and error increase the outdoor unit the center core round / turns 1 at a time. 1 round / turns mean 1 complete circle.
So you need both edge [ cutting edge ] of the cable to be the wireless antenna. Better install the cable one end at the roof top or near roof top, open area. One end is inside the house, anywhere you like.
Completed assembly, both end of the TV cable have a finished LauC2 antenna like the photo.
When you finish building 2 unit of this antenna. One unit install at outdoor where you can get STRONG cell signal strength and the front [flat area] of the antenna have to face vertical to cell tower, somewhere. Adjust the LauC2 antenna until you satisfied with the signal strength, test using your phone, recommended phone set to 2G for antenna adjustment purpose. Stay away from any wire mesh, object blocking, wireless device. Can put inside house window where can get good signal strength. if your house have lighting strike history, keep the antenna at secure location.
Now the indoor unit, anywhere you like where you want to put the antenna. Recommended at height area and open area for better indoor reception [ or center of the hall ceiling], and the location you always busy with your phone and keep distance with the wireless router. Just one condition, vertical or horizontal. Why? you asking? Take your phone, if antenna is vertical, phone also vertical getting strong signal strength. 2G signal always have better cell phone signal reception, tested device Nokia 1110i, 3 bar or full . Lumia 635 2G can get 3 bar signal. Moving too far away from the Lau2C indoor unit antenna, signal drop, tested 20-25m still have 2-3 bar. 1-3m i get full bar using Nokia 1110i.Smartphone always having poor signal strength.
Take off your smartphone additional phone case, some phone case really weakening the reception. If everything all right, you can dial out and received income call, even the phone show weak signal inside house, all phone carriers do have a free call customer hotline, dial the number and listen the audio quality.
The antenna no insulation part should not touching the wall or electric conductor.
If you want some dB value, enter Field Test mode on your smartphone
Android, access Settings>General>About Phone> Network or Status
Closer the value to -50dB, better the signal strength