aismon

Receiving, Decoding and Plotting AIS using a RTL-SDR

DrVarnik on YouTube has posted a tutorial video on how to receive, decode and plot AIS information. The Automatic Identification System (AIS) is a system used for automatic tracking of large ships and passenger boats. It is a similar idea to tracking aircraft with ADS-B. His method uses a RTL-SDR for receiving the AIS signals with SDRSharp, decoding received signals with AISMon and plotting the decoded information with OpenCPN. He uses VB-Cable for looping the audio from SDRSharp to AISMon, but if you have a ‘Stereo Mix’ or equivalent feature with your soundcard, that will be unneeded. Best results will be achieved using a narrow-band vertically polarized antenna tuned for 161.975 MHz and 162.025 MHz (marine VHF). A directional antenna would also likely be a benefit. You can find some designs to try lower down the page. For safety, please only use this guide on land! Wouldn’t want you getting lost at sea.

Here are the homepages of the software used:

  • SDRSharp
  • AISMon – You may need to first join the group with a Yahoo account to gain access to the file section.
  • OpenCPN
  • VB-Cable (for looping audio from SDRSharp to AISMON)

Below is a screenshot of OpenCPN in action:

opencpn

Here are some antennas designed for AIS reception:

 

For a tutorial with other software, check out the Cheap AIS Ship Tracking page at rtl-sdr.com

Decoding Flex 1600 Pager Traffic with SDR# & PDW

NeedSec just posted on YouTube a video illustrating how to use a RTL-SDR to decode Flex 1600 pager traffic using PDWVB-Cable and SDR#. It is always surprising there is still pager traffic as when is the last time you can remember seeing someone with a pager in public. We’ve shared videos showing this sort of thing before, but NeedSec gives a great overview of what you need to do to accomplish successful decoding of Flex-1600.

 

Decoding P25 with SDR#, DSD, and RTLSDR

Decoding P25 with SDR#, DSD, and RTLSDRThis is decoding P25 with DSD and SDR#. It isn’t the greatest, but I guess it’s a work in progress. You need a very strong signal, and just the correct audio levels and settings. Most of the video is P25 bits and pieces. My audio is not clipping, it’s simply a problem I cannot figure out with stereo mix. Source

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SDR# and RTLSDR WFM Stereo

SDR# and RTLSDR WFM StereoThis is a preview of SDR#’s WFM in Stereo using the RTLSDR at 2.048Mhz. Watch my mouse click Stereo on and off. This is a pre-release of the software with Stereo FM. Source

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Decoding P25 with SDR#, DSD, and RTLSDR #2

Decoding P25 with SDR#, DSD, and RTLSDR #2This is decoding P25 with DSD and SDR#.You need a very strong signal, and just the correct audio levels and settings. This is video number TWO where I got about a 98% decode. I had about 71% inlevel and it started working great. Please don’t mind the high pitched crackle in the audio, it is a problem with my sound card and NOT an artifact in the decode itself. When decoded there is nice clean audio (well, as clean as you can get with the horrible codec motorola uses!). sdrsharp.com Source

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2m Amateur Ham Band with RTLSDR and SDR#

2m Amateur Ham Band with RTLSDR and SDR#The 2m ham band with the ezcap RTLSDR stick and SDR# ( SDRSharp ). First few minutes are a repeater, next some APRS digital, and then a beacon from K2DLL in Upstate, NY. Source

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SDR# and RTLSDR WFM Stereo #2

SDR# and RTLSDR WFM Stereo #2This is the official release of WFM Stereo on SDR#. It has a stereo enhancement that provides better stereo separation and higher audio fidelity, I have tested this against WRPlus and SDR# is much better audio wise, and keeping a lock on Stereo. You can watch me clicking FM Stereo on and off, and on the top of the screen you can watch the (( stereo )) icon go on and off. Source

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