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Questions tagged [qrn]

QRN is the amateur radio term for "atmospheric" noise originating neither from the transmitting station nor the receiving station that is of natural origin, especially on the HF and MF bands. For discussions about noise as an inevitable component of a real signal, see [noise]. For questions about unintentional manmade signal interference, see [rfi].

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3 votes
1 answer

Why are there weird sounds in radio?

When I'm tuning through the radio on HF, suddenly, I hear a tone. So, I tune back, and the more I tune back, the more the tone changes pitch. For example, if I tune back 1 kHz, the sound rises by 1 Hz....
7 votes
1 answer

Where exactly does atmospheric noise (QRN) come from?

Where does the noise I can hear on my 28 MHz receiver come from? I'm not talking about the inherent noise produced by the internal circuitry of the radio, I mean the noise received by the antenna. It'...
4 votes
1 answer

How does a higher antenna reduce rain static on a lower antenna?

I have operated at several stations - including my own - where a 40m beam is stacked above a tribander. During a rain storm, there is so much QRN on the 40m beam that the band is unusable, but the ...
3 votes
1 answer

Why is QRN so bad on the low HF and MF bands?

If one tunes an HF/MF radio at night, the lower the frequency (or the longer the wavelength) of the band, the more QRN (static and atmospheric noise) there is. 80m is noisier than 40m, and 160m is ...
2 votes
3 answers

Where to find QRM and/or QRN audio files?

I'm looking for some QRN/M audio files to "show" someone what said noise can sound like, particularly interested in static crashes or lightening bursts. Have Googled same with no joy other ...