TNC PI

A raspberry pi TNC


Edsard Boelen, 09-november-2013
I wanted to have a good TNC so I can do some APRS experiments. TNC's come in all kinds of variants and prices. I choose the TNCpi because of the good functionality, reviews and the cost.

short introduction to TNC's



building the kit





The datacable for my yaesu 9800r is as follows:


install software and connect

The tncpi uses the standard kiss or ax25 protocol, just install ax25-tools which is available for most distributions and run:
axlisten -a

after installing and configuring xastir, I could transmit to a local repeater/gateway. My sign appeared on aprs.fi within minutes.


adding LCD and RTC

I will use the I2C capabillities to add an LCD and real time clock to it.

casing

For the power supply, I opened up an old adapter and put it in the case. The RTC and LCD fit barely in the case.