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Measuring Performance of Antenna - simple work

Step 1: Measuring the Distance to the Opening
As mentioned earlier, measuring the distance to the opening is critical to the operation and efficiency of the antenna. The old saying “measure twice and cut once” is also true here. But
instead, remember to “measure twice and drill once.” When you measure this distance, disregard the bottom lip of the can. This crimped edge of the can has no influence on the interior workings of the waveguide. You are only interested in the bottom material of the can, which becomes the back of your can antenna.
Step 2: Starting Small
There are several ways to get the hole for the N-Connector the right size. The method you use
is up to you. The final hole should be the diameter of the N-Connector stem.
In one method you can drill a small hole and work your way up to the desired hole size.
Another method, which is more time-consuming, is to use a nail to make the initial of the can. The can should stay completely round.
Step 3: Preparing for the Connector
There are different types of N-Connectors that you can use for this project. The type does not really matter. As you can see from Figure 3-8, our connector had four screw holes (one at each corner). The best way to ensure that the connector is installed properly is to insert it into the opening you created in Step 2, line it up, and mark out the holes for the four mounting screws. Once this is done, you can drill them with a drill of the same diameter as the mounting screws.
Step 4: Finishing the Hole
The final step in preparing the N-Connector hole is cleaning it. Using a small file, make sure that there are no edges or burrs around the openings. This will ensure a tight fit when the connector is inserted and connected to the coffee can.