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First decoded Meteor M2 Image using GNU Radio. Only took me 4 weeks lol

First decoded Meteor M2 Image using GNU Radio. Only took me 4 weeks lol submitted by /u/Tech2025_
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Radar VS. MCIR Enhancement

Radar VS. MCIR Enhancement submitted by /u/jeffreypkelly
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Came across this weird signal in the 440Mhz Band. Any help identifying would be appreciated.

Came across this weird signal in the 440Mhz Band. Any help identifying would be appreciated. submitted by /u/Orchestral_Design
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Does anyone have an idea what it is?

Does anyone have an idea what it is? submitted by /u/minemac
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my antenna broke. is this a good replacement?

submitted by /u/Xx_MR_X_xX
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HackRF Transmitting Project

Hi all, I'm looking to transmit with my HackRF and I wanted to do something similar to what was done by Great Scott Gadgets, where he replays a signal for a remote control toy car. (https://greatscottgadgets.com/sdr/11/) Do you know if most cheap toys are encoded at all? In his example there is no decoding involved which is ideal.

thanks!

submitted by /u/moriboto
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NOAA 19 HVCT 12-07-2018

NOAA 19 HVCT 12-07-2018

NOAA captured with cheap RTL-SDR dongle and old TV antenna.

(link)

https://i.redd.it/b8unrlvqsba11.jpg

submitted by /u/d_onem
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Nice NOAA19 APT pass — just saw it was passing by, so i recorded it xD

Nice NOAA19 APT pass - just saw it was passing by, so i recorded it xD submitted by /u/Tysonpower
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NooElec SawBird’s no longer available for sample

NooElec SawBird's no longer available for sample submitted by /u/rg422
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How does internals of the RTL-SDR work? Such as how are signals sampled, how IF works, and the different sampling modes and how they are represented.

If I understand the hardware correctly the RTL2832U is the chip that if used with drivers that Realtek intended it to be used with is the chip that will demodulate TV, FM bands, and DAB signals and then packages them up to be sent down the USB line. The R820T2 on the other hand is the chip that is acting as a wide-band receiver to tune to a frequency from 24-1850 MHz. So the R820T2 first collects a signal then the RTL283U samples the signals at some rate making the signal discrete. If this "flow" of a signal is correct then I have a few questions.

  • How does setting a discrete sample rate for the RTL283U limit the maximum bandwidth of that can be looked at? In sdr mode only 3.2 MSPS is possible, but in it's TV mode 8 MHz of bandwidth can be looked at. I am not sure what the connection is between the discreet sampling rate and the amount of radio bandwidth. Is it 3.2/2 so only 1.6 MHz of bandwidth can be looked at in sdr mode? If so what is happening in when you change the bandwidth setting under the Radio tab in sdr#? Also then why is the TV mode allowed up 8 MHz of bandwidth and why can I not seem to under any demodulation option under the Radio tab set the bandwidth to 1.6 MHz?
  • What are all these different sampling modes in SDR#? I've heard the term direct sampling when in reference to HF frequencies, but I'm not sure what is being said he'd different or directly? I'v heard term I/Q data before, but is there any resources to learn more about how it works? What I have gathered from this link is that I/Q is, for whatever reason, a good way to encode data about a signal's amplititude, frequency, and phase at a point in time with only a set of coordinates. Past this I'm not sure what these sampling modes mean or how they work.
  • There is an option for viewing the intermediate frequency (IF) in SDR#. How I understand this is that the hardware on the dongle is shifting a say 100 Mhz signal to a much lower radio frequency to make handling it easier? In IF spectrum on SDR# I see the upper and lower parts of a bandwidth being shown with the carrier frequency in the middle. Not really sure what this has to do with IF though.

Any help on moving forward on these topics so I have a better understanding of what is going on would be appreciated.

submitted by /u/WormLawyer
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