When I first went into Packet with a AEA PK 88 I had truoble sending and receiving. One of the tests was to make a test plug for the TNC which virtually sent the output of the TNC bac into itself ie: audio from the TNC connected to the RX audio to the TNC.
One other thing I had problems with is the TNC had gone out of sinc/tune. It took a whole year to find an out of print manual to get the instructions to put it right. The users hand book was no help at all.
If you like I could copy the relevant page and either e-mail or post it to you.
Hope this was some help
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