Weird waterfall

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kellogs

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May 6, 2026, 12:23:29 AM (13 days ago) May 6

to Gqrx SDR

Hi,

Here is a 2FSK signal captured in GQRX v2.11.5 via an RTL SDR v3

The programmed frequency deviation from center are: 28, 44 and 59 kHz

Signal is 19.2 kBaud, and I can see it well on the waterfall for 28 kHz, almost well for 59 kHz but half of it is missing for 44 kHz. When captured with GRC and viewed in Audacity it looks well @ 19.2 kBaud. Tried changing center frequency and signal pattern to all '0x5555...' without much impact. Why is this happening ?

Thank you

target_deltaF.png

larger_deltaF.png

small_deltaF.png

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