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Raspberry-Pi-SDR-IGate.pdf
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2023-02-27
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Raspberry-Pi-SDR-IGate.pdf
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Raspberry Pi SDR IGate
Last update 11/9/2015
7/3/2016 – Added note about /etc/modprobe.d/raspi-blacklist.conf.
9/22/2016 – Clarify IGate server rotate addresses.
5/28/2017 – Details about frequency calibration.
Warn against cheap versions with terrible frequency accuracy.
It’s easy to build a receive-only APRS Internet Gateway (IGate) with only a Raspberry Pi and a software
defined radio (RTL-SDR) dongle. Here’s how.
Hardware Required
Raspberry Pi
I happened to use the model 2 so I can’t say, with certainty that the earlier models would be fast
enough to keep up. “top” shows about 93% cpu idle time so the older models are probably
more than adequate.
The procedure here is known to work with the Raspbian operating system. This was originally
written for Wheezy and later tested with Jessie. Some adjustments might be required for other
operating systems.
SDR Dongle
This connects to the USB port and an antenna. This is the one I used.
http://www.amazon.com/NooElec-RTL-SDR-RTL2832U-Software-Packages/dp/B008S7AVTC
There are many others that appear to be equivalent such as
https://www.adafruit.com/products/1497
I RECOMMEND THAT YOU AVOID THESE. Things have changed over the past couple years. The
earlier (now cheaper) devices have terribly inaccurate frequency references. Mine is off by
about 60 Parts Per Million (PPM) which comes out to around 8 kHz on 2 meters or 25 kHz on 70
cm.
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