Radio pre-soldered PCB, constant thumping noise
Hi, wondering if there's anything that would lead to this constant beating noise? You can hear it it's just this rhythmic choppy sound that keeps playing regardless of channel. Switching PSU or cases did not help
56 Views
Hi Eric
thanks for the audio sample.
IIn a Eurorack system, switching power supplies, LED PWM, digital modules, or an unstable ground reference can sometimes create exactly this kind of hard rhythmic noise. The station itself may be tuned correctly, but the interference is then mixed into the received signal or passed into the audio path.
Could you please try this test:
Remove the module from the rack and power it from a a clean external power supply (if possible, or a PSU with no othe rmodules attached). Do not connect any patch cables except the audio output. Connect a longer patch cable directly as an FM antenna to the output and search for stattions again.
If the noise disappears in this setup, the cause is most likely related to the rack power supply, grounding, or interference being coupled into the antenna path. Thanks, Stefan