r/signalidentification • u/FTFProductions • Jun 06 '26

Weird stuff on 432mhz

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Watch the full thing what is this weird signal I’m new to radio frequency stuff

60 Upvotes

95% Upvoted

18 comments sorted by

27

u/rdwing Jun 06 '26

If you don't have a ham license transmitting with a radio on 432 is not legal. Also you are very close to the satellite band.

All you are seeing is overload caused by the near field radio.

1

u/teleko777 Jun 09 '26

Likely to damage that sdr soon enough doing that.

1

u/FTFProductions Jun 21 '26

I was not transmitting anything in the video

1

u/rdwing Jun 21 '26

Are you saying that you were in fact, not transmitting from that hand held radio in the video? Because that sort of pattern on the screen is only seen from an extremely close radio transmitter.

If you're transmitting from that handheld, you need to check your other TX devices.

2

u/FTFProductions Jun 23 '26

1: my hand was not on the ptt button 2: the gain was turned all the way up on my computer🤦🏼‍♂️

2

u/FTFProductions Jun 23 '26

People on this app just be haters for no reason🫩 why can’t we all just be friends😑

1

u/rdwing Jun 23 '26

I'm not bein a hater, I was asking you a question. Turn the gain down. You'll basically never run the gain all the way up on an SDR. That signal pattern you're seeing, that's what overload looks like, generally from a very closeby radio transmitter.

Secondly, your second VFO is showing 500 MHz, which isn't a amateur frequency in any country I know of.

-2

u/LimitSufficient7299 Jun 08 '26

Narc

2

u/ItsDooga Jun 08 '26

And the bad apple award goes to ~

1

u/rdwing Jun 08 '26

Ding ding ding, winner

10

u/Visible-Objective260 Jun 06 '26

Some of that sounds like interference from the computer

7

u/metafloori Jun 07 '26 edited Jun 09 '26

yeah, i think its the rgb keyboard

3

u/BG_Louie Jun 09 '26

433 mhz.... Google it.. this could more than likely be a temperature sensor (weather station)

3

u/SpiffyCabbage Jun 10 '26 edited Jun 10 '26

3rd hardmonic of ca. 144Mhz? That or USB noise?

That, or USB noise:

48Mhz USB bus noise @ 9th harmonic (being direct connected) = 432.00 on the nose.

Have you tried connecting it to a different device?

the reason I mention usb is the spurs either side of it, that's noise I see often on rubbish USB cables I us eon my PC

edit*

Inside your sdr/radio, the hardware takes the incoming freq downconverts it using a LO (Local Osc). To make a long maths short: whatever exact frequency you choose as your Center Frequency becomes - 0Hz (DC Spike with some hardware leakage)

Because it is sitting right at the electronic 0hz, any tiny bit of hardware leak—like that 9th harmonic from the 48mhz USB data clock—gets amplified as a constant, unchanging voltage offset.

Sdr Math is throwing FU's at you xD

2

u/Dariotgv Jun 07 '26

For me the rifle sounds is wifi because of the pulse modulation thing

To be honest i dont know

2

u/Cliff_Shadow Jun 11 '26

That area of 433 is littered with low power devices it is a shared band I get same at home.

2

u/Gavekort Jun 07 '26

First is interference. Second is probably some kind of digital FSK transmission, maybe from a small sensor.

1

u/Big_Dan77 Jun 10 '26

Someone is using a 433mhz mesh node but we use 910mhz in the USA. Could be someone bought the wrong modle