This is a portable packet station, complete with Windows Server computer, TNC, and mobile radio.

It's waterproof, portable, and pretty durable. Here's what's inside and how I made it.

The radio is an Icom IC-228H, a 45W 2m mobile radio. I interfaced its microphone input to the Kantronics KPC-9612 TNC using the gray cable as shown in the picture. The mic connector on the radio also has audio out for the TNC, so it is convenient for a single cable. The computer has an onboard ethernet, but it is not used since I have the USB WiFi card, shown on the left. Power is supplied by the battery on the left (note power switch on the top) and distributed to each of the components through Anderson Power Pole connectors and the distribution box shown.
Here is the tiny single board computer, an AMD Geode running completely fanless and on a 12V DC supply. I installed an actual 12V regulator to prevent any power spikes or over-voltage conditions from reaching the board. The board consumes less than 700mA on normal operation, even with the ram and flash drive. The 7812 regulator is easily capable of delivering up to 1500mA and the input voltage is never likely to be over 14V so it doesn't even need a heat sink. I soldered a 0.1uF capacitor across the output to absorb noise.

The CPU runs at 500MHz, pretty slow by today's standards. However it gets the job done. It has 1GB of ram on the back side of the board, and an 8GB flash drive that it uses instead of a hard disk. It is completely solid-state.

Here is the internal battery, with its own fuse and switch. The system is designed to run off an external power source, with a power cable with power pole connectors that plugs in to the distribution box. This internal battery will either run the system or charge when the switch is on.

The station uses a Kantronics KPC-9612 TNC. I added a USB WiFi stick instead of using the onboard ethernet on the motherboard. The power distribution box shown rear left distributes power to the 5 devices using 12VDC.
Here is the Icom IC-228H radio, an older single band 2m 45W mobile rig. It feeds audio and mic signals directly to the TNC.

Packaging it all up together, here is the top-down view of the box.

Here is the station, complete and running. The radio is hooked to the roof antenna, and it is tuned to 145.670MHz. The callsign is KD6GKD-4 for the RMS node, if you are in the area and wish to connect to it.

Any questions about it? Feel free to leave a comment and I'll reply.
73 de KD6GKD