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Voltage Standing Wave Ratio VSWR. Impedance mismatches in a radio frequency (RF) electrical transmission line cause power loss and reflected energy. Voltage standing wave ratio (VSWR) is a way to measure transmission line imperfections. Specialty we have to test VSWR in 2G, 3G and LTE Base station ( BTS) RF antenna feeder cable. Now normally We can not see Feeder cable used For BTS. only used 1/2 Inch Jumper cable RRU to antenna. still we can see used RF 7/8 Feeder cable use for the IBS DAS ( distributed antenna system). If VSWR value higher than 1.4 we can not on air the site. In this video You can see how to that test VSWR in the RF feeder cable. Youtube https://www.youtube.com/c/layabro Blog http://layabro.blogspot.com / Follow Me   https://www.facebook.com/youtubelayabro  https://twitter.com/LayaBrolaya

Battery Bank එකක් මිලදී ගැනීමට පෙර අනිවාර්යෙන්ම මේ වීඩියෝ එක නරබන්න. චීන්නු කොහොමද අපිව රවට්ටනේ කියල ඔයාටම තේරේවි. යාලුවන්ටත් දැනුවත් විම සදහා මේ Video එක Share කරන්න අමතක කරන්න එපා. කවදාකවත් අඩු ගානට තිය ව්ලොකු mAH  ගණනක් සඳහන් Battery Bank මිලදී ගැනීමෙන් වලකින.

How to make a sky lantern at home.This sky lantern is made out of thin polythene bag you can use garbage bags also. Blog http://layabro.blogspot.com/ Follow Me https://www.facebook.com/youtubelayabro https://twitter.com/LayaBrolaya

This is a very simple Electronics circuit. I used only two transistor for this UM 66 Melody generator circuit. UM 66 has an inbuilt beat and tone generator. The time base for beat and tone generator is an inbuilt oscillator. You can use this circuit for your door bell and specialty you can use this circuit For Choon pan vehicle . Component List 1) Two C828 Transistor ( Or You Can use any other PNP Transistor ) 2) UM 66 IC 3) Two AAA Battery ( remote control Battery Or pen torch Battery )4) One Speaker Youtube https://www.youtube.com/c/layabroBlog http://layabro.blogspot.com/ Follow Me https://www.facebook.com/youtubelayabro https://twitter.com/LayaBrolaya