| 15 Mar 2023 |
 sa2kng | mirroring is not a harmonic, it's because the sampling rate and the filter doesn't match | 17:17:45 |
 lefuturiste | Ah yesssd | 17:18:08 |
| sa2kng | you will also see intermodulation based on strong stations like fm broadcast etc | 17:18:16 |
| lefuturiste | Juste recalled my physique course | 17:18:36 |
| lefuturiste | Repliage | 17:18:42 |
| lefuturiste | But the software I'm using should adapt the sampling up to a certain point right? | 17:19:58 |
| lefuturiste | Shannon theorem | 17:23:04 |
| sa2kng | https://www.rtl-sdr.com/measurements-on-rtl-sdr-e4000-and-r820t-dvb-t-dongles-image-rejection-internal-signals-sensitivity-overload-1db-compression-intermodulation/ | 17:24:03 |
| sa2kng | it is nothing that the sw can fix, if the receiver doesn't have filters for each sample rate then you will absolutely run in to nyquist | 17:25:18 |
| lefuturiste | https://fr.wikipedia.org/wiki/Repliement_de_spectre | 17:26:17 |
| sa2kng | what make you think I read french ? | 17:26:47 |
| lefuturiste | just for reference because I said "Repliement" | 17:27:33 |
| sa2kng | vet inte ens vart jag ska börja | 17:28:12 |
| lefuturiste | "don't even know where to start" x) | 17:29:19 |
| lefuturiste | okay well all of this make me want to study signals physics again and do some experiments | 17:29:53 |
| lefuturiste | I probably want to study antennas | 17:30:37 |
| lefuturiste | * I probably want to study antennas also | 17:30:41 |
| sa2kng | recognizing signals by eye can help a lot, listening on them with fm/ssb demod gives hints as well. there's a heap of tools for digging deeper in demodulating further | 17:31:37 |
| sa2kng | by knowing your hw and how it behaves you can probe if the signal is real or not. adjust tuning and see how it changes, lower gain and see if some disappear, point the antenna in another direction etc | 17:32:53 |
| 17 Mar 2023 |
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| 25 Mar 2023 |
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