Abstract: A wireless scoring system is provided which does not require any interconnecting wires between the scoring equipment and the fencers and which requires no change in existing fencing or scoring equipment. A touch detector unit is worn by each fencer and is operative to provide signal indications of fencing touches or hits which uniquely identify each fencer and which signify valid and invalid hits and which can be wirelessly transmitted to receiving apparatus coupled to the scoreboard or other scoring equipment. The system is plug compatible with existing fencing weapons and scoring equipment and is readily employed therewith.

Abstract: In a method of calibration of a voltage controlled oscillator (VCO), the VCO (100) provides an output signal which is used to drive a dividing oscillator (10) such as a relaxation oscillator (RO). The RO has at least two states, one in which the RO provides an output signal which has a first frequency that is related to the VCO output signal by a first ratio (e.g. 1/N) and one in which the relaxation oscillator provides a RO output signal which has a second frequency that is related to the VCO output signal by a second ratio (e.g. 1/(N+1)). By measuring the first and second frequencies (and knowing the relationship between the first and second ratios), the VCO frequency is calculated and stored (110). Several VCO frequencies can be calculated and stored for several applied voltages. As a result the VCO can be driven to any selected frequency in the calibrated range and can be used to provide an injection frequency for a radio.