FAQ:

• Will you supply schematics and documentations about this development?
  Yes, as far as it is needed to understand the design architecture.
• Will you supply the FPGA programming information?
  For those who decided to buy an Altera USB blaster or compatible, I will provide the firmware file on request. See also the version information page.
• Why isn't there any integrated FW upgrade?
  1) Because the FPGA is not a microcontroller, any update would have required extra space in it. Even then the upgrade procedure is not as easy as you might be used with µCs.
  2) Developing any properitary protocol and tooling is totally out of scope due to the necessary effort.
  3) An idea of using the 4 parallel IO lines of the FT232R was no longer tracked because that needs to reprogram the FT232R, which is pretty dangerous, even I once accidentally have overwritten an USB blaster because this has the same device.
• Will you supply VHDL source code for your project?
  Generally not. Only in case of special agreement.
• Will you sell ready made units?
  Rarely there are used test samples availble, but regularily I do not sell ready units.
• Can I also connect other receivers than the miniADSB to the external ports?
  Yes, this is possible, as long as the signal is equal to the signal of the miniADSB, best resulting from a AD8313 log detector.
• Do I need to take care on the sensitivity of the components, in other words: May I destroy components while completing the kit?
  You need some moderate soldering skills and a soldering iron for electronic circuits. Never use one that directly is connected to the 110V/220V mains. Take care on discharge, avoid areas (for example carpets) which you know that you sometimes get a small electric shock. Touch the PCB only on its corners. Simply said: Be carful! If you don't dare doing this, ask around, someone from your friends surely has the right equipment.
• Is there any distinction between Mode-A and Mode-C frames?
  Just the reqeuesting radar station knows that. On the air, and especially as a passive receiver, there is absolutely no indication if it is a Mode-A (squawk) or a Mode-C (altitude) frame. See also http://www.radartutorial.eu/13.ssr/sr07.en.html
• I noticed that there are two versions of the Hardware (1.0 and 1.1)?
  Currently there is only Hardware version V1.0. See also the version information page.