RA1AHQ | Blog about Radio and Linux

July

2020

13:55

Creating a list of computers connected to the network

Linux, безопасность

31 July 2020 13:55

In a large network with DHCP enabled, intrusions sometimes occur - third-party connections.
They need to be tracked. It is convenient to take pictures of the network - before and after.
In the article I talk about two ways to compile a list of computers (a network snapshot) - using nmap and arp-scan.

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July

2020

Rainbow over St. Petersburg

фотографии

23 July 2020 0:15

On July 22, 2020, a rainbow shone over St. Petersburg.

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July

2020

Solving the Yaesu VX-6r's silent modulation problem without replacing the microphone

трансивер

22 July 2020 8:32

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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July

2020

Wavy noctilucent clouds July 13, 2020

фотографии

15 July 2020 0:47

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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July

2020

Noctilucent clouds over St. Petersburg July 14, 2020

фотографии

14 July 2020 23:45

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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Blog about Radio and Linux

Creating a list of computers connected to the network

Rainbow over St. Petersburg

Solving the Yaesu VX-6r's silent modulation problem without replacing the microphone

Wavy noctilucent clouds July 13, 2020

Noctilucent clouds over St. Petersburg July 14, 2020

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