September 1, Introduction. Many users in smaller towns and rural locations rely on cellular service as their only source of broadband internet. The Yagi-Uda antenna--often just called a "Yagi"--is a popular antenna due to its gain, directionality, and relatively lightweight design see the figure to the right.
Yet, unlike other directional antennas e. His techniques are simple and achievable with relatively common hand tools, all band yagi antenna plans. I have actually built three antennas based on his techniques, the first two using a PVC boom, and the latest--the one described here and pictured at the top of this page --using a metal boom. My primary goals were twofold: This is not bad all band yagi antenna plans all considering that the antenna has a theoretical gain of Some sacrifices were made in the interest of cost and simplicity.
The remainder of this article is organized into the following sections: The software provides a datasheet with the required element lengths and positions, and further specs for the coax connection balun. If you plan to follow this tutorial as-is, using the same parts described here, click the link below to download my datasheet for either 4G LTE or 3G coax balun info included: I did not provide a datasheet for the MHz range because the dimensions of the resulting antenna are much smaller.
Although I have not tried it, you might want to experiment with a design frequency somewhere in the middle of each of the above ranges to achieve better performance e. The above datasheets assume that the passive elements make metal-to-metal contact with the boom. For this reason, the above datasheets are specific to the parts described here. The software is free and very easy to use click the image above to download it. Plus, you can save the other 5 ft for another Yagi.
Or, ask an employee to cut it for you. EMT conduit is a fraction of the cost of aluminum or copper. But, unlike aluminum, you can solder EMT as long as you sand-off the finish at the intended soldering point. There are many options for this metal, spanning a wide range of prices. This metal is well-suited for outdoor use. Alternatively, metal coat hangers will suffice. These particular hangers have a plastic coating, which can easily be stripped off.
Keep in mind that you really just need metal rods or tubes that can be soldered. For the element Yagi shown in this tutorial, we need about 9 ft 2. The driven element needs to be electrically isolated from the boom; all other elements will be soldered to the boom.
Find something which you can repurpose for use as the standoff, preferably something durable. A plastic bottle cap, for example, will work; but, it might not last long in the sun. For this short length of coax, I suggest choosing the type of coax with the same impedance as your longer coax run the long run of coax that connects the modem to imerys annual plan antenna.
You can always replace it later with the RG58 version. Click here for more notes on this topic. Here, I will demonstrate using RG59 because I had a remnant piece available with a pre-attached F-type connector. Building the Yagi The following 10 steps will be used to build the antenna: A vise is also highly recommended. It helps to use a vise to hold the conduit while cutting see Figure 1. Cut the ft EMT conduit into two 5-ft sections. Draw guide lines along the length of the boom The next step is to draw two lines along the length of the boom, one line on the top, and one line on the bottom.
These lines will serve as guides to help ensure that the elements are aligned see Figure 2. To draw the top line, all band yagi antenna plans, place your straight edge along the length of the boom, clamp provigil and pristiq boom to the straight edge or step on the boom to prevent movementand then follow the straight edge with your marker, drawing a line on the boom.
Then, flip the boom over and use the straight edge and marker to draw the bottom line--starting at your mark--in the same fashion used for the top line. Draw top and bottom guidelines along the length of the boom. Mark the positions of the elements The next step is to mark the position of each element on the boom. Using your ruler and marker, measure along anti fungal powered by vbulletin of the guide lines and mark the positions of the elements according to the Yagi Calculator datasheet.
Repeat this process for the other guide line. Thus, you should have marks for the elements on both sides of the boom i. Figure 3 shows a screenshot of the datasheet for 4G LTE with the element positions highlighted in yellow. Figure 4 shows an illustration of the relative position "Spaced" and absolute positions "Boom position" of the first four elements. Figure 5 shows the boom with the marked positions. The "FD" stands for "folded dipole;" this is the driven element radiator.
Diagram of the relative and absolute positions of the first four elements based on the 4G LTE Yagi datasheet. Mark the position of each element along the guide lines on both sides of the boom. Drill the holes for the reflector and directors The next step is to drill holes through the boom for the reflector and directors. To keep the drill-bit from drifting during drilling, use a center punch to make an indentation at each marked position except for the driven element ; see Figure 6.
Next, drill the anemia and skin allergies halfway through from each side of the boom see Figure 7left. As you drill the opposite-side hole for each element, run the drill bit briefly though both holes to remove metal shards Figure 7right. Make an indentation at each marked position. Drill all band yagi antenna plans holes halfway through from each side of the boom. Measure and cut the reflector and directors The next step is to all band yagi antenna plans and cut the reflector and directors according to the Yagi Calculator datasheet.
Figure 8 shows a screenshot of the datasheet for 4G LTE with the reflector and director lengths highlighted in yellow. The datasheet states that the all band yagi antenna plans lengths must be within one millimeter of the stated lengths.
Use a pair of metal-cutting dikes or a hacksaw to cut your elements. You can remove bends by gently pounding them out with a hammer. Be sure to cut each element a bit long, and then file the element down to the correct length, all band yagi antenna plans. This filing also helps remove jagged edges all band yagi antenna plans the cut ends. The element shown is Director 1, which has a length of mm.
Figure 10 shows the reflector and all 12 directors cut to length. After all of the elements are cut to the proper lengths, mark the midpoint of each element. These marks will later serve as guides when mounting the elements to the boom. The particular element shown in Figure 11 is the reflector, which has a length of mm, a mark at the midpoint of 99 mm, and flanking marks at 90 mm and mm.
Cut each element a bit long, and then file it down to the correct length. All 12 elements cut to length and organized. Mark the midpoint and two 9-mm-away-from-midpoint points. The driven element is arguably the most crucial piece of the entire antenna.
The Yagi Calculator datasheet lists the specs of the folded dipole, a screenshot of which is shown in Figure 12 for 4G LTE with the most important parts highlighted. As stated in the datasheet, all band yagi antenna plans, the distances should be measured from the insides of the bends inner edge on one side to inner edge on the other side.
For the 3G version of the antenna, the lengths will be shorter because the design frequency is higher--refer to the actual datasheet PDF. Then, mark the distances HI and GF 70 mm.
Next, bend the coat hanger around some round object to create the bends e. Figure 13 illustrates the basic structure for which you should aim. Figure 14 shows the resulting folded dipole, all band yagi antenna plans, which I created by bending the coat hanger around the spindle of my vise, all band yagi antenna plans.
Also, note that I used all band yagi antenna plans brass-looking coat hanger for this folded dipole only because I already had a spare cut to a total length of mm. You can use the same metal as used for the other elements. Illustration of folded dipole shape and important dimensions. Actual folded dipole created from a coat hanger. Mount the directors to the boom Now that all of the elements have been created, all band yagi antenna plans next step is to mount only the directors to the boom.
The reflector and driven element will be mounted later. To do this, sand around each hole on the boom see Figure Figure 17 shows a close-up of one of the solder joints. My soldering job in Figure 17 is poor. There is way more solder than is needed, all band yagi antenna plans. I had to let the iron reheat for seconds after each application, and thus the messy soldering job.
It helps to have a more powerful iron or a propane torch. Bend the directors as needed to correct for inevitable misalignments. Sand around each hole down to the bare metal to all band yagi antenna plans that the solder will bond. Sight down the boom to ensure alignment of the elements; bend the elements as needed to correct. Mount the folded dipole to the boom The next step is to mount the folded dipole to the boom.
The folded dipole needs to be insulated from the boom.