Homebrew APRS – Arduino Uno KISS TNC

So, What’s all this about?

Last week I was looking on eBay at what rigs and equipment was around and found some transceivers with APRS and thought “I don’t have anything that can do APRS, That could be handy when I go out to the bush and there are no mobile phone towers in range, say if I got stuck. These prices are a bit high for something I wouldn’t use much though.”

So then I looked at APRSdroid and saw that it can be connected to a radio, either directly (but you have to use vox) or via a TNC. I looked at TNCs online and saw not only that they can be expensive but that there isn’t much to them and went looking for some ideas on building one. Continue reading “Homebrew APRS – Arduino Uno KISS TNC”

My BitX/40 Project

I ordered the BitX/40 SSB 40 meter transceiver kit from HFsignals (Ashhar Farhan VU2ESE) and paid the extra for DHL shipping. I ordered on Sunday the 7th of May, and it arrived at my QTH in Australia from Hyderabad, India on Friday 12th of May.

So, I set to work on assembly and modifications. I have used a 20×4 lcd screen instead of the 16×2 one that came in the kit, installed a MUCH bigger heatsink on the IRF510 PA MOSFET, set up TX sense for readout on the screen, a 10-turn precision pot for better tuning, selectable LSB/USB (this was already in amunters code I modified for my purposes but wasn’t in VU2ESE’s original code) and built but haven’t connected yet ND6T’s forward and reflected power meter and adapted his code to work with amunters raduino code.

BitX/40 in LSB mode

Continue reading “My BitX/40 Project”