Category Archives: Linux

Linux

OP25 For Dummies – Or how to build a police scanner for $30 (Part 1)

OP25 is a program that decodes P25 Phase 1 and Phase 2 digital radio.  Some municipal areas are upgrading to P25 Phase 2 so almost gone are the days that you can track them with a police scanner since P25 is a Trunked Radio system and not just a lone frequency to monitor.   The only things that do Phase 2 are hardware scanners and hardware radios and OP25 for software radios.  Bear in mind Phase 2 could be encrypted and nothing you can do will decode it.

OP25 is HARD.  I’m a geek and I messed with it on and off for a year or more and it whipped me more than once.  Now that I have it working I find that it is REMARKABLY easy and I’m mad at all the geeks out there who never made a simple tutorial.  There are tutorials out there, some good but everybody leaves out the good stuff or the stuff they took for granted.

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DOD CAC Card on Ubuntu Linux

NOTE:  I’m a retired government employee now with no CAC card.  I believe this blog may be somewhat outdated but I’ll keep it up and any readers should view the comments for updated configuration details.  Many thanks to those of you now minding the store!

So, you are a government employee AND a Linux geek.  Join the club.  It is possible to use your smart card to access DOD CAC Card enabled sites.   A must do project for the Linux geek in you.

 

I’m doing this with an IOGEAR GSR202 and it will work with a lot of other CAC Card readers as well.  Also I’m using Ubuntu 18.04

First of all the information is taken from this excellent website.  While almost perfect there are a few minor issues that could foul a fella up.  I seek to clarify those here.

First lets download the Certs for your browser.  They also come from the page I have linked above (MilitaryCAC.com).  Download here.  Hold tight.  We’ll get back to them.

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Raspberry Pi and LogitechMediaServer and Squeezelite

First you need to download the latest Raspberry Pi Raspbian OS from here.  Get whichever version you want but I like to get the desktop version so I can VNC into it as it makes it easier.

If you have never done this connect your Raspberry Pi to a monitor, keyboard and mouse.  If you are an old salt with Linux then just run headless and SSH into your Pi.

Once you download that file UNZIP IT.  UNZIP IT.  The file will end with an extension of .img

Do NOT try to burn the zip file to your SD card.  UNZIP IT AND GET THE .IMG FILE.

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Using A Laptop Without Internet

This is one of my favorite subjects.  Repurposing an older computer and using it when there is no available internet connection.  If you have internet that is a big plus and you can and should use it but computers are still pretty useful with no network with the addition of a couple of pieces of inexpensive hardware.

What can a computer do that isn’t hooked to the internet? Quite a lot actually. Here’s a few things you can do:

  • Watch digital over the air television
  • Listen to FM or AM radio
  • Listen to Shortwave Radio
  • Listen to Amateur Radio
  • Listen to emergency service transmissions such as police, fire, weather, etc.
  • Decode NOAA Weather Satellite Images
  • Detect Aircraft Overhead
  • Decode Digital Transmissions that are unencrypted

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How to do Screen Sharing on Ubuntu 18.04

I set Screen Sharing up on Ubuntu 18.04 but then found out none of my clients could connect to it.  After a little digging I found that in order to use VNC Viewer (or other software) from another computer that I had to disable encryption.  Yeah, not ideal but I need it to work.

First go to Settings and then “Sharing”.  Make sure to turn the Slider in the upper right hand corner to the ON position.

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