Amateur Radio Reopening Station Project (2024/04/29) |
On January 17, 2016, there was an incident where lightning struck the antenna and destroyed all radios and appliances! My main FTDX3000 also broke and I had to buy another FTDX3000 from Tomei Denshi in March 2018 and sent it back!
But the 20mH coconut tree I was using instead of a tower. It was cut down because it was old and in danger of falling over.
Before it was cut down, four full-size yagi antennas on three coconut trees. Each band was attached with a fixed beam.
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I'm so happy to be the owner of such a happy free tower because it's the Philippines! A home-made 14MHz 3-elecet yagi antenna that was installed for Europe. It flew well.
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A 7 MHz dipole antenna was mounted on the remaining 20-meter pipe tower Because the tower stands at the edge of the site, it cannot be inverted V, so it is a diagonal dipole.
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The power supply part is a cutting board purchased at a grocery store The handle part of the cutting board is just right for the coax holder. Since the balun was not sold, I took JQ2GYU Sakurai's advice and installed 3 snap cores!
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UNITRUS in the town of Osamis is the place to go for wires and parts.
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Pulleys are attached to both ends of the element to allow the antenna to be raised and lowered for adjustment. This is also the advice of JQ2GYU Sakurai-san, a DXer and owner of two cranked-up towers! He, too, uses pulleys to adjust the low-band dipole.
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The cutting board of the power feed section is machined so that no force is applied to the simultaneous shaft connectors. It is also a folder for elements instead of corrugated insulators
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Adjusting element length with NanoVNA-H4 purchased by mail order in the Philippines for 4200 pesos (about 11,500 yen) 7MHz has the lowest SWR at 7.090MHz
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But 21MHz has the lowest SWR outside the band with 22.140MHz I was looking for information on the Internet and found what I thought was information on Youtube's "Momo Channel! on Youtube.
https://youtu.be/LbjRYRG9x9I?t=487
I will write about how to put 21MHz on a 7MHz antenna in my diary on May 3.
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April 04, 2024 April 30, 2024 |