I'm trying to get on the air with APRS. Initially I'd like to use my old Kantronics KPC3 TNC in Kiss mode, Xastir on Linux and my VX-7R radio. After getting familiar using this gear I will probably move up to better equipment.
I haven't used my TNC in many years. When I tried to turn it on I ran into a problem, it seemed to be completely dead. No lights on the front panel and no data coming from the serial port to my console. I did some troubleshooting and was able to get it to show some signs of life.
If I remove the RAM Backup Battery, and hold the the reset button down then turn it on, the green power light will turn on and from the serial port I get the following message
REPLACE TEST JUMPER
That is as far as I've been able to get. Interestingly the moment I replace the RAM backup battery I once again can't turn the device on. I push the power button but get no lights and no data from the serial port.
I've tried powering the device from the internal 9V battery connector, and from an external 9V power supply. I've also tried a couple of fresh CR2032 coin batteries in the RAM Backup Battery. None of the jumpers appear to be incorrect, and there doesn't appear to be any damage to the board. I know this device was working the last time I used it (although that was about 10 years ago).
The KPC3 has 128KB RAM installed and also has the Dallas DS1215 real time clock installed.
If I don't get any joy here I may purchase a TNC-X from these people http://www.tnc-x.com/
, however I'd love to get my KPC3 going again. I may also go with one of the dedicated APRS devices from Argent data systems.
Any help would be very much appreciated