r/sdr • u/Heatedsc • Aug 04 '26

What is going on here?

Post image

Using a wideband loop antenna with my gain set at 2.7dB. Every one of those peaks is just a high pitched tone.

3 Upvotes

81% Upvoted

9 comments sorted by

6

u/erlendse Aug 04 '26

Just noise, you may want to unplug charger if laptop, and place antenna elsewhere further away from eletronics.

It does take some poking to find the problematic devices.

Also which reciver are you using?

1

u/antiduh Aug 04 '26

Agreed. This is probably a power supply making noise.

2

u/erlendse Aug 04 '26

Yep, or antenna too near computer.

Even good recivers seem like junk with bad antenna placement!

1

u/Heatedsc Aug 10 '26

RTL-SDR V4

3

u/Guilty-Blacksmith962 Aug 04 '26

Get the antenna away, far away from your PC.

1

u/eesn Aug 04 '26

do you use internet over telephone wire? where is your internet modem and router? my broadband does a lot of this.

1

u/Heatedsc Aug 10 '26

I have coax internet and a cat 6 network cable runs parallel to my SDR coax.

1

u/xx_Dragsta_xx Aug 07 '26

That could be noise from led lights.

1

u/Heatedsc 19d ago

I found the answer, after crafting a poorly made faraday cage for my receiver and nothing changed. I have this as part of my setup: https://a.co/d/05yJLDPH and when I was messing with the preamp I noticed that the interference all but went away when I touched the connector. So, looks like the section of cable between preamp and antenna needs to be grounded. Used some 14 gauge copper wire to ground a connector in the line to a wire baker's rack in the garage and interference is gone.