[David], DL1DN, is an Amateur Radio fanatic with a penchant for minimal-energy (QRP) moveable functions. Not long ago he was out and about, and found that 10 m propagation was extensive open up. Not discouraged by acquiring overlooked his antenna, he kludges up a makeshift one particular working with a 20 cm length of aluminum foil (see video clip demonstration under the break). [David] wasn’t wholly unprepared, as he did have the loading coil for his transportable 20 m antenna, but was lacking the telescoping whip. He calculated the whip duration must be around 20 cm for 10 m operation, and crinkles up a sheet of foil the approximate duration. He tunes it to duration by rolling the tip to shorten the “whip” right until he receives an SWR minimum.
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Schematic of [David]’s QRP Moveable Whip Antenna

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[David] describes this design of transportable antenna in a further online video, making use of a extra conventional telescoping whip as the radiating element. The loading coil is designed from frequent PVC pipe and insulated wire. Even though these are not essentially the most economical antennas, they can do the trick when portability is a key worry. For a diverse method, here’s a QRP Hackaday.io transportable antenna undertaking applying a magnetic loop antenna. But for the best in QRP, check out out this transmitter we wrote about in 2013 that uses only voice electricity to function.
What are some abnormal merchandise you have applied as makeshift antennas? Allow us know in the feedback below. Thanks to [mister35mm] for submitting this to our suggestion line.
