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Newbie radio
The world of beginner radio operation can appear very costly and even intimidating, however it may be fairly rewarding too. Additionally known as ham radio, the interest permits folks to ship communications over a protracted distance and throughout a complete host of protocols, together with common talking, Morse code, tv, and even TCP/IP for sending packets over the web. Nonetheless, the tools required to get began continues to be pretty costly, so Paul Timkovic, who runs the ham radio YouTube channel OM0ET, determined to construct his personal antenna utilizing solely a tape measure together with a number of different cheap components.
Finish fed half wave antenna fundamentals
One well-liked antenna selection amongst beginner radio lovers is the tip fed half wave (EFHW) design, because it lets a single piece of steel decide up multi-band frequencies whereas solely needing a coaxial cable at one finish. This implies it may be simply mounted in all kinds of locations for a comparatively low value, though it’s also extra inclined to interference in comparison with different varieties.
From electronic-notes.com
Modifying the tape measure
To start out his mission, Timkovic bought a metal tape measure with a 50m size and promptly lower it all the way down to 40m to attain excessive sensitivity within the 3.75MHz and seven.125MHz bands. Aside from the tape, some copper wire was wrapped round a magnetic core to create an identical transformer. Its accountability is to rework the antenna’s excessive impendence of round 4,000 to five,000 ohms to a mere 50 ohms that the coax feeder possesses.
After securing the coax connector and transformer to the within of the tape measure’s housing with a silicone adhesive, Timkovic connected a bigger wire to the output of the transformer and soldered the opposite finish to an alligator clip that clamps onto the tape as soon as prolonged.
Setup and testing
With the {hardware} now prepared, Timkovic went exterior into an area forest and arrange his new tape measure antenna. The bottom was anchored to the bottom utilizing the built-in strap and a screw, whereas the opposite finish 40 meters away was hooked onto a small tree. The incoming sign was analyzed by a MINI1300, which is a handheld machine that, amongst different issues, is ready to sweep throughout a number of frequencies and show how robust the sign is at every one. Unsurprisingly, the antenna was fairly good at selecting up the three.75MHz and seven.125HMz bands whereas struggling at larger frequencies.
As soon as accomplished, Timkovic bought out his X6100 transceiver and made profitable transmissions, all of which have been seen on the transceiver’s waterfall show. To see extra of this DIY antenna in motion, you may watch his video right here on YouTube.
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