We've got the Heyworth D-Star on the air...and completing the testing. I've gotten a couple of questions about how much it all costs. So to share with everyone, here's what we've invested:
Used Kenwood TKR-820 UHF repeater, narrowbanded $270
Duplexer - notch only, mobile type, donated $0
DVRPTR d-star connection, with cables and enclosure $130
Raspberry PI computer board, with case, with heatsinks, with power supply $70
Coax, donated $0
Power strip with surge connector $15
Coax surge protector $35
Antenna, donated $0
All together, we have $532 invested in the KD9AKF system. If you were building a comparable system, you would probably spend another $100-$200 on a duplexer, $100 for coax, and then anywhere from $150 to $350 for a quality antenna. Low end, you're looking at $900 for a complete system - high end, you should be under $1400.
We went really quick getting our system up and running - we went from "idea" to "working system" in 60 days. We'll end up having another $100 in labor costs to get the repeater reprogrammed for our final coordinated frequency.
We also have been really fortunate to have a great working relationship with the local grain elevator that is providing us with tower space. We're also getting a free internet connection from the wireless internet provider that is co-located at the elevator. How sweet is that!