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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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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The Web utility PHPMYADMIN is used by the software developers to create and modify MySQL databases. After a few years of using this program, in connection with the transition to the newer MySQL 5.7.30 and PHP 7.2, it was necessary to update the phpmyadmin until the latest version ...

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It is difficult to work on satellites without using Doppler effect compensation. After all, during a flight, the reception frequency changes, especially quickly in the middle of the orbit.

There are two ways to compensate for frequency changes due to the Doppler effect - manually, using two independent transceivers (or one with Duplex function) and automatically using programs such as GPredict, SATPC32 or Orbitron.

In this article I will try to set up automatic correction of transmitting and receiving frequencies in Linux.

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In order to transfer files from a smartphone to a personal computer or output sound from a PC to a Bluetooth speaker or headphones, you need to connect the Bluetooth USB adapter to the computer, turn on and configure Bluetooth. This article is about how to enable Bluetooth in Linux.

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The standard soundmodem program decodes only strong Packet and APRS signals on frequency 144.800, skipping weak transmissions. Therefore, I decided to replace the Soundmodem with a more modern DireWolf packet modem and configure it according to the instructions https://elafargue.github.io/aprs-box/direwolf/#configuring-direwolf.

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Upgraded an old 10 year old PC from Ubuntu 14.04 LTS to 16.04 LTS.
Almost broke the system during the upgrade release.
But everything worked out.

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Using a amateur radio station without a computer is almost unthinkable - even SSB and CW contacts require registration in a radio log. Linux is actively developing radio control using a computer. This review article is about interfaces and programs for working as a transceiver (transceiver) in Linux.

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I would like to collect on this page all the information about using the repeater on board the ISS (International Space Station) and other operating satellites (PSAT) to transmit APRS packets.

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