digital noise

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Λάζος Τσαφταρίδης

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Apr 23, 2026, 3:11:20 PMApr 23

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Hi everyone,

I am experiencing an issue with my Radioberry setup and I was wondering if anyone else has faced something similar.

When I use the Tune or 2-tone functions, the signal is perfectly clean. However, as soon as I switch to SSB (USB/LSB) using an external USB microphone/audio interface, I get a massive amount of digital noise across the entire waterfall (splatter), even at minimum power.

Current observations:

· The issue persists even at the lowest drive levels.

· The "Tune" signal is 100% clean, which suggests the RF final stage is fine.

· I have verified my grounding and shielding, but the noise remains.

· It seems like a digital/buffer issue or a sample rate mismatch between the USB audio input and the Radioberry gateware.

I am using a Raspberry Pi 5 with PiHPSDR.

Has anyone encountered this "noise floor lift" when using USB audio?

Any advice on how to troubleshoot the audio pipeline would be greatly appreciated.

Best regards, SV8ZI ,Lazos

usb noise.jfif

pa3gsb

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Apr 24, 2026, 10:20:49 AMApr 24

to Radioberry

Hi,

Based on the latest image i connect an usb headphone with microphone and did add the audio in the transmit setting popup.

Hope this gives an idea?

73 Johan

PA3GSB

Op donderdag 23 april 2026 om 21:11:20 UTC+2 schreef zant...@gmail.com:

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