A 555 sending out a string of pulses at 2KHz is what I’d use, but give the resistor capacitor oscillator a try, it might work. I haven’t verified this but I believe it should give you a 2000 Hz tone when tuned to the transmitter frequency.
A 555 sending out a string of pulses at 2KHz is what I’d use, but give the resistor capacitor oscillator a try, it might work. I haven’t verified this but I believe it should give you a 2000 Hz tone when tuned to the transmitter frequency.