The I-Gate consists of a small red PCB which contains an FSK transmitter, as well as some software that runs on a Raspberry Pi.
Features
Gates all received packets to FELINET
Gates only relevant packets from FELINET to RF
Digipeats packets from RF to RF
Beacons its own status packets, containing uptime, hardware/software information, and transceiver temperature
1W transmit power
With CATS coding gains, this is equivalent to a much more powerful APRS transmitter
With the gateway that exists between FELINET and APRS-IS, packets that are picked up by this I-Gate eventually end up on APRS-IS.
Initial Setup
Warning: Do not run the I-Gate without a properly matched antenna or dummy load connected. Failure to do so could result in transmitter failure!
The board should be installed on a Raspberry Pi. Since the software is very lightweight, it should work on any generation Pi.
For software setup, refer to the instructions here.
Ordering
The I-Gate board is available for $24 USD, plus shipping. This is just for the raw board - you will need to supply a Raspberry Pi. Of course, the software is completely free and open source.
You can purchase from Tindie.