The essence of the experiment: find out which antenna will create the maximum field strength at a distance of 5 km.

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This antenna is designed for "Fox Hunt" on cars, the frequency of the lighthouse 144.7 MHz. I realized it. Coordination using Hairpin from wire.

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Dipoles for two bands 144 and 433 MHz for operation through VHF repeaters (gain 0 dBd / 3 dBd).

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I offer translation of documentation in Russian for the WSJTX_improved program.

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The article lists the days of FT8/FT4/JT65 activity on on very high frequencies (VHF), in the bands 144, 432 and 1296 MHz.

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I am sharing a very simple way to repair a magnetic base.

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I received an email asking me how to generate a sound signal for a beacon in PI4 mode.
In the article I talk about how I managed to do it without using third-party hardware, only using Linux software capabilities.

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Radiomobile - a program for calculating the level of the signal on the VHF between the points on the map written by the Roger Coudé radio amateur with the callsigns of VE2DBE. I propose a brief introduction to its installation and use in Linux OS.

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In amateur VHF antenna designs, a split half-wave vibrator is often used. The manufacture of the power supply raises questions.

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At work I was given a “new” ADSL router. Among the useful things in it are a 19-volt power supply and antennas.
I disassembled the antenna (the router is stated as dual-band 2.4 and 5 GHz) to look at the design...

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