Difference between revisions of "Scanner"

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(updated page to reflect the current SDR-based scanner system)
 
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In April 2015 we revieved a Uniden 996T Digital Scanner on long-term loan by a very generous member of the public. This is a top end scanner that can receive the P25 digital mode used by our local emergency services and elsewhere across our state. We have an Icecast server to stream a feed from this radio so members can listen in remotely.
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In 2015, Bloominglabs received a donation of a Uniden P25 digital police scanner, and we shared that audio online via an Icecast feed for many years. However, technology evolved, and while we still have the Uniden scanner at the space we now have a more modern and feature-rich scanner feed built from Software Defined Radios (SDRs). It's now possible to listen to live scanner audio as well as archived audio, without missing any radio traffic.
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http://bloominglabs.no-ip.org:8000
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== Troubleshooting ==
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=== Listening Links ===
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If for some reason the scanner icecast feed goes down this is how to toubleshoot it.
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* First, verify the scanner is turned on. It should start scanning immediately after it's powered on, if not then make that happen.
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https://openmhz.com/system/bmgsafet - this is probably the easiest site to use
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* Once it's scanning it should periodically output some audio.
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** If there's no audio, make sure the volume knob hasen't been turned down.
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** If there's audio coming directly out of the scanner then the audio output cable may have been unplugged, verify the audio cable on the back of the scanner is plugged into the audio line output.
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* The recording output on the scanner feeds into an AG150 for the stream (attached to the bottom of the shelf above the scanner)
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** The IP of the AG150 is labled on it for easy access.
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** If the mic input level gets messed up on the AG150 use alsamixer to set the mic input level back to about 20%.
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* Additionally, there is another component that updates the stream name. The scanner has a serial output which is connected the the AG150. There is a script on the host that reads this and updates the icecast server.
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https://radio.bloominglabs.org - this site has some advanced features and more closely resembles a traditional scanner interface
  
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* The last leg is a port forward from the Linksys router from TCP port 8000 to port 8000 on the AG150.
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Both feeds contain radio traffic from in and around Monroe County, Indiana including many agencies in Bloomington as well as some state agencies and the occasional federal agency.
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=== Technical Details ===
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At Bloominglabs:
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* 3x RTL-SDRs with indoor antennas
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* Intel NUC running Debian GNU/Linux
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* [https://github.com/robotastic/trunk-recorder Trunk Recorder] software (sends recorded audio to both OpenMHz and radio.bloominglabs.org)
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In the cloud at radio.bloominglabs.org
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* VPS running Debian GNU/Linux
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* [https://github.com/chuot/rdio-scanner Rdio Scanner] software

Latest revision as of 20:01, 7 September 2022

In 2015, Bloominglabs received a donation of a Uniden P25 digital police scanner, and we shared that audio online via an Icecast feed for many years. However, technology evolved, and while we still have the Uniden scanner at the space we now have a more modern and feature-rich scanner feed built from Software Defined Radios (SDRs). It's now possible to listen to live scanner audio as well as archived audio, without missing any radio traffic.

[edit] Listening Links

https://openmhz.com/system/bmgsafet - this is probably the easiest site to use

https://radio.bloominglabs.org - this site has some advanced features and more closely resembles a traditional scanner interface

Both feeds contain radio traffic from in and around Monroe County, Indiana including many agencies in Bloomington as well as some state agencies and the occasional federal agency.

[edit] Technical Details

At Bloominglabs:

  • 3x RTL-SDRs with indoor antennas
  • Intel NUC running Debian GNU/Linux
  • Trunk Recorder software (sends recorded audio to both OpenMHz and radio.bloominglabs.org)

In the cloud at radio.bloominglabs.org

Retrieved from "http://www.bloominglabs.org/index.php?title=Scanner&oldid=4877"
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