signals compared, in sequence, with those selected from the swept frequency; hence, close control of frequency stability is needed to permit a few per cent resolution within, say, a 10 Hz bandwidth filter. Instruments can be narrow range, 0.1 Hz–30 kHz, up to wide range, 1 MHz–40 GHz...
It is so called because it is produced by a frequency-calibrated tuned trap similar to an absorption wavemeter. absorption modulation Also called loss modulation. A system for amplitude-modulating the output of a radio transmitter by means of a variable-impedance device (such as a microphone ...
HP AGILENT 4193a VECTOR IMPEDANCE METER W/ PROBE .4-110 MHz TESTED GOOD HP Agilent 4280A 1MHz C-Meter/C-V Plotter Capacitance Voltage Measurement System HP Agilent 4284A Precision LCR Meter HP Agilent 4291A Impedance/Material Analyzer, opt 001, 1C2 ...
AUTOMATIC FREQUENCY CONTROL - See AFC. AUTOMATIC GAIN CONTROL - See AGC. 10-1.2 BACKWARD WAVE OSCILLATOR (BWO) - A cross-field device in which an electron stream interacts with a backward wave on a nonreentrant circuit. This oscillator may be electronically tuned over a wide range of ...
1. A method for tuning an envelope tracking amplification system (100) having a radio frequency (RF) power amplifier (110), the method comprising steps of: determining a preferred operating point for the RF power amplifier (110) for each supply voltage of a first set of supply voltages to ...
The frequency range is swept from 80 MHz to 1000 MHz with the signal 80% amplitude modulated with a 1 kHz sine wave. The frequency range is swept incrementally, and the step size is 1% of the preceding frequency value. The dwell time at each frequency is 1 sec, and cannot be less ...
The first of these is that there is a close similarity in the action of an AFC voltage in an FM tuner to the action of an automatic gain control in an AM one. In both cases the control system sees the change – in carrier frequency in the case of an FM tuner – which is produced...
Determination of deterioration resulting from long exposure to swept frequency (or random vibration). Recommended Frequency Ranges for Tests Hertz: 1 to 10, 5 to 35, 10 to 55, 10 to 150, 10 to 500, 10 to 2000, 10 to 5000. Recommended Combinations of Amplitude and Frequency IEC Publication...
A method and apparatus for equalizing the sensitivity of an ultrasonic detection system of the type using Doppler frequency in which a test unit generates a spectrum of energy of different frequencies, and transmits the spectrum through transducers located in the areas to be protected, to create,...
1. A system for controlling a plasma generator, the system comprising: an open microwave resonator resonating at a resonant frequency; an oscillator with an output having a variable frequency; a control circuit for measuring a difference between the resonant frequency and the variable frequency and ...