Abstract: A signal conversion apparatus includes a local oscillator for locally generating a signal having a frequency, a phase shifter for shifting the phase of the locally generated signal output from the local oscillator by an amount determined based on a relationship between the amount of phase shift and the amount of frequency pulling, and a converter for converting an input signal by using the phase-shifted locally generated signal output from the phase shifter. The phase shifter varies impedance between the local oscillator and the converter so that the oscillating frequency of the locally generated signal output from the local oscillator remains unchanged.

Abstract: A radar includes a transmitter circuit, a receiver circuit, an antenna and a circulator. The receiver circuit includes a low-noise amplifier which amplifies a received signal fed from the antenna through the circulator. A local oscillator provided in the receiver circuit generates a local oscillator signal of which frequency is approximately half the frequency of the received signal, and the local oscillator signal is amplified by a buffer amplifier. An even harmonic mixer including an anti-parallel diode pair also provided in the receiver circuit as a frequency converter mixes the received signal output from the low-noise amplifier with the local oscillator signal output from the buffer amplifier to generate and output an intermediate frequency signal.

Abstract: A signal conversion apparatus includes a local oscillator for locally generating a signal having a frequency, a phase shifter for shifting the phase of the locally generated signal output from the local oscillator by an amount determined based on a relationship between the amount of phase shift and the amount of frequency pulling, and a converter for converting an input signal by using the phase-shifted locally generated signal output from the phase shifter. The phase shifter varies impedance between the local oscillator and the converter so that the oscillating frequency of the locally generated signal output from the local oscillator remains unchanged.

Abstract: A radar includes a transmitter circuit, a receiver circuit, an antenna and a circulator. The receiver circuit includes a low-noise amplifier which amplifies a received signal fed from the antenna through the circulator. A local oscillator provided in the receiver circuit generates a local oscillator signal of which frequency is approximately half the frequency of the received signal, and the local oscillator signal is amplified by a buffer amplifier. An even harmonic mixer including an anti-parallel diode pair also provided in the receiver circuit as a frequency converter mixes the received signal output from the low-noise amplifier with the local oscillator signal output from the buffer amplifier to generate and output an intermediate frequency signal.

Abstract: A demolition agent for brittle materials in the form of a powder mixture comprising 100 parts by weight of quicklime, 0.05 to 5 parts by weight of a carbonate and either or both of 0.01 to 5 parts by weight of a hydroxy-carboxylic acid or its salt and 0.1 to 5 parts by weight of a fluidization agent. This demolition agent is used by admixing with water to obtain an aqueous slurry, pouring the slurry into a hole drilled in a brittle material and allowing it to stand to demolish the brittle material by means of expansive pressure from the slurry.