Tried building a transmitter but it isn't working. I'm out of ideas and stuck now. One thing I found out was that my 9 V battery is oscillating at 80-89 MHz, that must be why it doesn't work.
Audioguru,
Does it matter what kind of capacitors/resistors used? I'm building your Mod 3, but nothing is working. Might be because of my inductor. I just used some cheap wires to wound it; it bends very easily. If you have any tips please let me know. Maybe I'll just build your mod 4.