Custom Radio Module

I decided to try my hand at building my own transmitter module. I did this mostly to save weight rather than lofting a heavy handheld radio. The Radiometrix 300mw HX1 radio seemed to be a solution that worked for many,  so my brother and I bought three of them and proceeded to design the custom radio module.

I started with some simple design goals:

  • Low battery voltage cutoff feature
  • Interface that matches the TinyTrak
  • Pre-emphasis circuit to compensate for the digital only nature of the transmitter module
  • SMA output

Circuit Diagram



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