This site is dedicated to my exploration is the world of EVDO! Here you will find the information for the hack seen on Hak5.org’s episode 3×05. As seen on that show this mod cost a whole three dollars to make and is very cost effective, and preforms wonderfully compared to the factory made flip-up antenna.
I made this mod because of the lack of signal I get while at my house! While on the move it was not so bad! I would drop a signal every now and then. I was really disappointed with the fact I was paying 60.00 per month for this service and I had yet to experience the broadband connection I was promised!
So pondering this, I started my research. I first started by seeing what options I had, how much such options would cost, how portable is it, and if it required other proprietary equipment. Lets just say I really did not want to invest that much money!
So I continued my quest for the, oh so elusive Broadband Internet connection and decided to find the operating frequencies that my service provider operates on. I had found that Verizon uses 800-1900 “give or take 100 mhz.” I did some research on they types of antennas offered in this range and the design concepts. I tried my hand at making a few of them, and they did work, but they all had something or a combination of things i did not like about them. They were: to bulky, to big, to flimsy, or not cost effective!
So i decided to try test one more idea. I did some research and found some software to help in the calculations needed to find the needed elements length. Once that was found, I then needed to find the right diameter filament needed for the antenna. I tried many different items “which must be metal” and with trial and error i located it!
I cut the length of the element to 4″, and started playing with it. I disconnected the usb-720 and inserted the element, reconnected the modem and did a speed test. To my amazement I was getting a better connection and was able to connect to Rev (A)! w00t!
Now its the fun part, tuning it!
This part was nothing more then snipping a small amount off the antenna till i got a better signal. So I would watch the meter provided by the verizon dialer and repeat the process over and over again till i was happy with the amount of signal I was recieving.
Just a rule of thumb, you do not want to be less then 3.5″, anything less your not operating in the proper frequency range any more!
From here i still am not finished!
I needed to find a way to support the element and make a ground plane for it! So i looked around and located some springs. I used 2 different springs, one of them, i pulled on it to stretch it out, this was to make it connect to the connector on the evdo card. I sniped off, one end from each spring and made a slight adjustment to make them contact each other.
I then located some rubber tube which just fit inside the spring and prevented the element from grounding out and killing the signal!
well thats just about it!
I spent 2 months playing w/ this antenna and i love it!
Happy Hacking!