Frequency-hopped electronic signal transmitter

摘要: A multi-frequency electronic signal transmitter includes apparatus for transmitting an on each of a plurality transmission frequencies in succession such that the is detectable substantially without interruption by compatible receiver within range signal, which tuned to any one frequencies. Direct digital synthesis circuitry responsive data representing amplitude respective discrete portions sinusoidal waveform generating analog corresponding thereto. Frequency control provided controlling direct generate selected succession. In embodiment, correspond modulated (AM) radio broadcast band. another frequency (FM) tone generator transmitted as audible