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Because the Image frequency when mixed with the LO also creates a signal at the IF, the RF image rejection filter on the input of the receiver filters out any radio signal at the image frequency. Local oscillator radiation. Retrieved 22 October 2013. The Race for Wireless: How Radio Was Invented (or Discovered?). With the older spark gap transmitters then in use, the Morse code signal consisted of short bursts of a heavily modulated[clarification needed] carrier wave, which could be clearly heard as a series of short chirps or buzzes in the receiver's headphones. To monitor a frequency of 1500kHz for example, he could set up an oscillator at, for example, 1560kHz, which would produce a heterodyne difference frequency of 60kHz, a frequency that could then be more conveniently amplified by the triodes of the day. ^ Rohde & Bucher 1988, pp.4455 ^ "Crystal filter types". ^ "Reception of Amplitude Modulated Signals - AM Demodulation" (PDF). Hagen -p.58 l.