Two T-80-2 ferrite porcelain rings are stacked together. Sticking with universal glue, or other means make these two magnetic ring together. The ferrite magnetic ring has been polished during the machining process, so it is not necessary to wind the magnetic ring with a strap. You may want to wrap around the strap on this magnetic ring so that it becomes more easily and stable in the winding, but I have not used the belt, so I am very careful when I am winding, using the two colors of the line for the winding The two lines are distinguished. Double-wire on the magnetic ring and wrap around 23 laps, the interval distribution is uniform, and the two lines are parallel to each other and close to each other. That is, the white line is 23 laps, the black line 23 lap, the white line and the black line are at the same time. About 4 inches left at the head tail as the lead wiring. Note that the interval between the end of the head is 1/4 inches after the end of the head. Then drill holes on the outer casing and install the socket and terminal blocks.
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The terminal and the black line of the white line are shorter and exfoliated from the copper wire, and then welded on the common ground of the terminal. The insulated outer skin of the wire is very firm, so please peel the upper tin in advance. The start of the white line and the beginning of the black line are properly cut, and the two lines are welded to both terminals, and when stripping the insulated outer skin, please do not damage the core wire inside. Use a lead wire to weld one of the ends of the BNC socket on the center of the BNC socket, and the other end is welded to the terminal of the start side black line. The ground wire of the BNC and the ground line of the terminal. After processing the finished joint, this Barn is attached to the side of the plastic box. I used a hot launcher and a transparent hot melt glue stick. Carefully place the nozzle of the solder torch in the middle of the magnetic ring, cast the transparent solder into the shape of the mushroom, and carefully press the solder until the solder does not arrive at the top of the Barley. You can choose the filling method you think of the appropriate. The size of the magnetic ring size is not strict, and can be placed in a 35 mm film plastic box or a small bottle. The magnetic ring is self-shielded, and almost any material can be used as a box. If you accidentally send 100W's power into this QRP Barry, just like I have experienced, the ferrite core still shows some overload capabilities. If you use a metal box, you must additionally pay an additional wiring column and the box insulation, you can use some insulating gaskets to help insulation. The sole disadvantage of the plastic box is to use the components of the screw nut, like the BNC socket, loose after a long period of time, which is indeed a problem that should be considered. I used a variety of lines to test, found that the value of the 23 laps is not very strict, and the value of 21-24 circles can also meet the requirements. This Barron has a good performance in the band of 160 to 10 meters, I used 10 watts of carrier power for a long time test, and the magnetic ring did not rise. After calculation, in the case of 5 watting input, the resistance loss is less than 50 mW. After this Barn is completed, it can be easily placed in a shirt pocket, only 2 oz.
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