Patent ID: 7269200

Claim:
A frequency hopping communication device including a voltage controlled oscillator for producing a modulated signal having a carrier wave modulated by a modulation signal, said carrier wave having a carrier frequency changed into any one of a plurality of hopping frequencies at regular intervals, said frequency hopping communication device comprising: a memory for memorizing a plurality of modulation coefficients related to the hopping frequencies, each modulation coefficient being related to one of the plurality of hopping frequencies, each modulation coefficient being calculated from linear interpolation of a first frequency deviation result of a first carrier frequency modulated with a predetermined pattern signal and a second frequency deviation result of a second carrier frequency modulated with the predetermined pattern signal, the calculation being performed by a processor and frequency deviation measuring unit; a control unit connected to said memory for reading out one of the modulation coefficients as a read out modulation coefficient on the basis of a following hopping frequency from said memory when the following hopping frequency is decided; and an adjusting portion connected to said control unit and said voltage controlled oscillator for adjusting voltage amplitude of the modulation signal by the use of the read out modulation coefficient to restrict frequency deviation of the modulated signal within a predetermined range regardless of the carrier frequency.