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TNC-PI or TNC-X Problems [message #3208] Fri, 19 February 2016 01:49
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Registered: December 2004
Senior Member
A TNC-PI was purchased to create a packet communications server.

Purchased from here:
http://tnc-x.com/TNCPi.htm

This is a very nice circuit and does an excellent job. The instructions were very good and easy to follow. However the instructions on how to get it working and how to setup a radio and add all of the necessary next steps are not.

This first one took a few hours to put together. Testing it was the hard part. A Motorola radio was used to test the TNC. A serial to Motorola cable was constructed.

The Raspberry pi was setup and all of the necessary packages configured.

The TNC only transmitted once. From then on, there were problems.

Two other TNC-PI's kits were delivered for a local club to be assembled. Out of the two, one of these TNC-PI's actually worked. But not always. They were very sporadic.

After closer examination, the TNC-PIs were found to have poor through hole connections. You HAVE TO make sure that anything using a through hole was soldered on BOTH SIDES.

IMPORTANT!!! This will be repeated again: MAKE SURE BOTH SIDES OF ANY PARTS THAT CAN BE SOLDERED ON BOTH SIDES, ARE SOLDERED ON BOTH SIDES!

After close inspection, if the soldering iron is NOT left connected for a little longer than normal and the solder does NOT reach through to the other side and actually flow to the other side, this board will NOT function properly!

Please check the top of the board and look at all solder joints. Especially under the sockets for the IC's.

All three boards were inspected, re-soldered on both sides and they all worked perfect. KC2NDA
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