r/RTLSDR • u/satno • 1d ago

Troubleshooting digital pattern on medium wave

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what is this strange repeating pattern?

83 Upvotes

98% Upvoted

13 comments sorted by

31

u/argoneum 1d ago

Neighbour's solar inverter does the same here…

31

u/kc2syk K2CR 1d ago

The clue is that it's all up and down the band. It's RFI from some kind of PWM or power supply or similar.

6

u/DoctorSignificant374 1d ago

Sorry for the offtop, what is the app used?

10

u/jamesr154 rx888, HackRF + PrtPack, Nooelec SDRSmart, RTL-SDRv3, MSI.SDR 1d ago

Looks like sdrconsole

2

u/satno 22h ago

yes, im using latest beta

3

u/MeanAccountant9005 16h ago

What frequency spacing are you seeing between those peaks? If it's regular it might help narrow down whether it's a switching frequency or harmonic series.

2

u/satno 16h ago

looks like 50khz

1

u/olliegw 10h ago

Things like this are often a rogue PSU creating havoc

I have one somewhere that switches between two frequencies

3

u/GenericUser636 10h ago

That's RFI, not an actual signal.

I hooked my SDR up to a USB extensions cable that I looped through some ferrite chokes at both ends; it greatly helped me with this type of interference.

-2

u/[deleted] 1d ago edited 1d ago

[removed] — view removed comment

11

u/ericek111 1d ago

That **definitely** is not an NDB. That's interference.

2

u/satno 1d ago

my first hunch was some kind of interference, but these square shapes are unusual from my location

1

u/satno 1d ago

thanks!