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WebSDR on Raspberry Pi
radio : by Tommy - August 10th 2015, 05:12PM
In Fall 2014, I setup my first Raspberry Pi WebSDR receiver for the 40m amateur radio band. In late July 2015, the Raspberry Pi stopped working at all. Once I hooked a monitor up to it, I learned the SD card had been corrupted. I'm now in the process of rebuilding the receiver and will be updating the steps required to setup this project on my project page.
The receiver hardware itself is fine and operational, it is only the WebSDR host (Raspberry Pi) that is out of commission.

For now the WebSDR and ISS iGate must connect to my home network via a wireless link from my ham shack behind my house. I'm in the process of digging a trench to run a network connection out to the shack so I don't have to wrestle with spotty wifi coverage. I'm going to be running fiber optic for the main run for reason I'll explain that in an upcoming post.

tags: raspberrypi ham radio raspi linux

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Raspberry Pi TNC ISS iGate
radio : by Tommy - April 8th 2014, 02:04PM
Not so long ago I completed construction of my Raspberry Pi TNC, the TNCPi. Construction of this kit was very straight forward. A few additional pictures would have made this a great kit for beginners, but still the same it's an easy build.

Building Tips
A couple of items to note regarding construction. Ensure the correct polarity of the electrolytic capacitor (C1): The negative stripe goes toward C15.
The transistor (Q1) PN2222's flat side goes away from the edge of the board.
The voltage regulator (U1) MCP1700's flat edge goes toward the edge of the board.
Crystal X2 (20MHz) is near U1. Crystal X1 (3.57MHz) is neat Q1.
Note the pin 1 position of all ICs.

Interface cable
After completing assembly of the TNC, I set to work on creating a radio interface cable to connect to the DB9 port on the TNCpi.

The pinout for the TNC Pi matches the TinyTrak cabling:
Pin 1TX Audio
Pin 3PTT
Pin 5RX Audio
Pin 6Ground

Tuning Audio Output
After creating the cable, I set the audio output level as noted in the instructions. To do this, you'll need two radios. I used 2 HTs, one that I had created the interface cable for and a spare. Tune the radios to the same frequency (I used 144.44). On the radio with the interface cable, I pressed the PTT button and heard a tone being transmitted to the neighboring radio. Adjust R7 to it's maximum volume before it begins to distort.

After tuning the audio, the TNC Pi project is complete. How you plan to implement the TNC Pi is entirely up to the software you choose. For many, this may be Xastir for an APRS GUI. For others, it may be aprx to create an APRS beacon, iGate, digipeater or any combination of the three.

tags: raspi aprs ariss iss tnc raspberrypi

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