RTL SDR dongles with Raspberry Pi 3


RTL SDR dongles with Raspberry Pi 3


Last updated Nov 22, 2016


The Raspberry Pi 3 is a microcomputer, with roughly the same performance as a three-year old smartphone.
It's more than enough - how often do you redline your car?
A Paspberry Pi 3 costs around $40, uses common Android mobile phone chargers for power, utilizes microSD cards for data storage, has built-in WiFi and Bluetooth for easy connectivity, and is much faster and more usable than its predecessor, the RasPi 2.
Here are a few reasons why you should use them in conjunction with an RTL-SDR stick such as dongles from Nooelec, RTL-SDR.com or cheap alternatives off ebay.


1. Native Linux operating system


Quite a few tools and guides require Linux, and Raspberries run a derivative, called Raspbian, which is based on Ubuntu, which is based on Linux.
If these words sound alien, be assured: if you read or see Linux anywhere in a review or tutorial, more than likely commands and confusing-looking long sentences will work on the small computer.

2. No messing with your main workhorse computer


Partitioning a hard drive and installing Linux is an unnecessary pain with Windows, so using a separate computer for playing with the RTL stick is easier. Plus, if something is not going the way you intended, restoring the system takes 10 minutes by re-writing the microSD card with the last working image.

3. Less power use


A laptop uses 60-70 Watts of electricity, a desktop PC can use anything from 150W to 500W+. Raspberries use a maximum of 4 Watts, you read it right, four Watts on full blast. On average, less than one Watt. This is visible on the electricity bill if you run a computer 24/7 - let's not go into the tree-hugger argument, power must come from somewhere...

4. Small size


A Raspberry, upconverter, RTL dongle, low-noise amplifier (LNA) and filters fit into a cookie tin, so the whole setup can be placed right at the antenna, away from electrical noise.

5. Common voltage


5V is used by upconverters and LNAs, just like the Raspberry. Power everything with the same voltage.

6. No hassle remote power


So-called General Purpose Input and Output Pins (GPIO) pins are available, these are the needle-like protrusions on the image above. The board can be powered through a cheap Ethernet cable using Power-over-Ethernet: working homemade solution costs $10 (cable included), and dedicated off-the-shelf products make the whole endeavor plug-and-play for the less brave.

7. Easy ADS-B


Airplane / Flight tracking is cool, but if you contribute to a website, must be on constantly. Contributing data to sites such as flightaware.com is as easy as downloading a file, writing it to a microSD card, then plugging in the card. That's it, software takes care of the rest. Oh, and you get a free enterprise subscription to the website.

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