After several years of using the Yaesu VX-6r portable transceiver, it developed an unpleasant drawback - quiet modulation in the 144 MHz range. Symptoms - at the repeater’s “round table” the presenter could not make out the call sign, and when answering a regular call, the correspondents ran away in fear with the words “sorry, I can’t receive you, see you later.” 😏 The reason for this is the reduced modulation level, which appears as a quiet and unintelligible signal.

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On the night of July 12–13, 2020, I observed bright noctilucent clouds of complex structure. They were visible over St. Petersburg in the northwestern part of the sky. They were formed by wavy lines and stripes.

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No one knows for sure the origin of noctilucent clouds. They are located at a high altitude of 80 km in a layer of the atmosphere called the mesosphere. These days, July 12-14, 2020, they turned out to be especially bright.

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On July 27 and 28, 2020, I visited New Peterhof with my family. Since I haven’t been to Petrodvorets for a long time, and summer is in full swing.

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To search for rare countries or simply monitor activity on bands, DX clusters operating via the Telnet protocol are traditionally used. The advantage is low traffic consumption and low system requirements. The disadvantage is control using console commands and the lack of a graphical user interface. I found a successful solution that combines the advantages of a Telnet cluster and a graphical shell - a program from VE7CC.

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APRS over TCP-IP (over the Internet) is very easy to set up.

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The system time zone is selected when installing the distribution. In the future, you can configure time synchronization (NTP protocol) for more accurate time and organize the display of information about other time zones. For example, when it is morning in Moscow, it is deep night in the central part of the United States. This article is about how to improve time synchronization, set the time zone and display the time of other time zones on the screen.

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It is impossible to cover an entire area of the amateur radio hobby in one article - working via satellites. I will dwell only on the most difficult moments - various methods of working via FM and SSB satellites and correction of the Doppler effect.

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Frequency of spacecraft of radio amateur satellite service.

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A few years ago I learned CW (Morse code). Now I want to increase the speed after a long break, because soon there will be competitions on ultra-short waves. I am publishing a script that I developed for training telegraph reception by ear. The script plays random text through the computer speaker at a specified speed.

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