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Yagi Antenna |
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What Is A Yagi
Antenna? The word Yagi Antenna is the name of one of the Japanese inventors of these directional antennas. The other inventor's name was Uda so in technical circles these are Uda-Yagi antennas in honor of the inventor team. The invention is from the early 1900s. Yagi antennas focus the transmit and receive power in a single direction. They are best used for fixed locations such as homes, offices, farms and remote locations trying to reach far away cell sites. Yagi antennas should be mounted as high as possible on a tubing or pipe such as used for outdoor TV antennas. For best results, consider installations that make the cable as short as possible. While there is a multitude of directional antenna designs in use today, the Yagi directional antenna is the most popular, well known and most seen. Some people call these "beam" antennas, namely CBers and Amateur Radio Operators. How Do These Antennas Achieve So Much "Gain"? Basically they are directing a major or almost all of their signal in just one direction instead of dispersing all around a 360 degree circle. Features:
What Is "Gain"? This is the common term used when measuring decibels (dB) to determine the effectiveness of an yagi antenne in a given direction or plane. Simply put, it is the measure of the intensified signal where it is wanted or needed because yagi antennas cannot create gain. The yagi antenne is designed to manage the power in the wanted direction and thus reduce it in unwanted directions. Where Can I
Mount the Yagi Cell phone Antenna? Any vertical or horizontal pipe, roof edge, wall, window sill, balcony railing or fence post can be used. Where Do I Point
the Yagi Antenna? The front of the yagi cellular antenna has to be directed at the target, the cell site or repeater tower or other user. It is best to use a map and compass and knowledge of target location but usually you can locate the target if it has a signal being sent to you. By simply rotating your yagi cellular antenna until best signal is found then centering on the estimated location, satisfactory results may be had. Slowly rotate the antenna yagi and stop every 10 degrees. Record signal levels. Note the peak and decline positions and soon a center can be figured out then tighten the mounting bolts. Be sure to stand at least a couple of feet away from the antenna yagi and and to the back or sides. Never in front of the yagi antenna. Your body can greatly alter signal patterns. The yagi cellular antenna needs to be mounted as high and in the clear as possible. So good thinking must be utilized when deciding when more height is needed and how much longer the cable will be. On the other hand, if excess cable length is present, either remove it or run a long path to the yagi cellular antenna, never coil or fold up the cable. At cellular frequencies of operation, cable can be quite lossy. Signal loss or attenuation happens all along the cable. The rule is, the shorter the better. |
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| Installation Guide | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The complete wireless
booster package consists of
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1.
Inspect the yagi cellular antenna feed assembly output connector (Type-N, female
or TNC) to determine that it mates with the end of your station
transmission line.
2. Verify that the frequency band to which your
antenna has been tuned matches the frequency on which your radio
system operates. 3. Determine the direction of the desired maximum range and the tower leg on which the antenna is to be mounted. We are installing the antenna to a achieve the best cellular signal link over the air from the nearest cell tower (BTS). Mount the yagi antena to the tower using the furnished "U" bolt and bracket. Make sure the yagi cell phone antenna is properly positioned with the gamma-matched element/radome pointing upward. Orient the yagi cell phone antenna in the desired direction; tighten the mounting clamps securely to avoid movement after alignment. (Refer to Figures 1 and 2.) Find the highest possible location at the site and check the signal strength in different directions using a S4 or Nokia 5110 Net Monitor activated cellphone. Ensure that the cell phone yagi antenna is vertically aligned to the ground plane as in the photo above and that the black cap is on the top side. 4. Fix the YAGI Antenna 30 cms below from the top of the pipe to minimize the effect of lightning on the antenna. 5. Keep the coaxial antenna cable length as short as possible. To avoid signal losses over long distances it is recommended to use Belden RG-8 cable. 6. Minimum movement of pipe while demonstration will only ensure a stable signal. Mount the YAGI Antenna on a 1.5 inch diameter GI pipe having a length of atleast 20 ft. The secret of better signal is always more height and therefore it is recommended to use even a 20-40 ft welded GI pipe in very weak signal areas. For 40 ft pipe weld 4inch upto 20ft, 3 inch upto another 20ft and 2 inch in the final pipe for stability. 7. Fine tune the cell phone yagi antenna position by slowly rotating the pipe and checking on the RX (Signal receive Level); the lower the dB level the better the signal strength. In very weak signal areas even a steady signal upto 100 dB can allow voice calls. Final fixing of the cell phone yagi antenna position should be done in a direction where the maximum number of bars appear or the dB level is the minimum on the cell phone. An RX level of 70-85dB can deliver good voice clarity. Use Water Proof Insulation tape to cover all cracks and smooth it over the outer jackets. Failure to waterproof the connection will result in improper operation of your yagi wireless antenna.
9. Make an outgoing call and receive an incoming call to check the call clarity. If the call clarity is good and the signal optimized then lock the antenna position and fix the pipe permanently. Check that the cable is tied or taped to the pipe and does not hang loose. 10. Make a note of the signal strength, date of installation, Cell Id and Time Advance for future reference in a log book. |
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Articles on
Yagi Cell Phone Antenna