18WuD2x

502 oscillator-mixer • oscillatory current
+
oscillator keying
Output
oscillator synchronization The locking of an oscillator
in step with another signal source, such
as a frequency-standard generator.
oscillator tracking In a superheterodyne receiver,
the constant separation of the oscillator frequency
from the signal frequency by an amount
equal to the intermediate frequency at all settings
of the tuning control.
oscillator transmitter A radio transmitter consisting
only of a radio-frequency oscillator and its
power supply. The oscillator can be modulated in
various ways [e.g., on-off keying, frequency-shift
keying, voice amplitude modulation (AM), voice
frequency modulation (FM)].
oscillator trimmer In a superheterodyne receiver,
a small, limited-range capacitor connected in
parallel with the oscillator coil for tracking oscillator
tuning at the high end of a band. Compare
OSCILLATOR PADDER.
oscillator tuning The separate, often ganged, tuning
of the oscillator stage in a circuit.
oscillator-mixer 1. A combination stage in which
a transistor functions as a local oscillator and
mixer in a receiver or test instrument. 2. A device
designed specifically to function as a local oscillator
and mixer.
oscillator-mixer-detector 1. In a superheterodyne
receiver, a stage in which the functions of
high-frequency oscillator, mixer, and first detector
are performed by a single transistor. 2. A device
designed specifically to function as a local
oscillator, mixer, and detector.
oscillator-multiplier A single circuit that serves simultaneously
as an oscillator and frequency multiplier.
See, for example, OSCILLATOR-DOUBLER.
oscillator padder In a superheterodyne receiver, a
small, limited-range variable capacitor connected
in series with the oscillator coil for tracking oscillator
tuning at the low end of a band. Compare
OSCILLATOR TRIMMER.
oscillator power supply 1. The direct-current or
alternating-current power supply for an oscillator.
2. See OSCILLATOR-TYPE POWER SUPPLY.
oscillator radiation The emission of radiofrequency
energy by the oscillator stage of a
superheterodyne receiver. Also see OSCILLATOR
INTERFERENCE.
oscillator-radiation voltage The radio-frequency
voltage at the antenna terminals of a superheterodyne
receiver that results from signal emission
by the oscillator stage.
oscillator stabilization 1. The automatic compensation
of an oscillator circuit for the frequency
drift resulting from changes in temperature, current,
voltage, or component parameters. 2. The
automatic stabilization of the operating point of
an oscillator circuit against variations resulting
from changes in temperature, supply current or
voltage, or component parameters.
Variable
tuned
circuit
+
oscillator tuning
Output
oscillator-type power supply A high-voltage,
direct-current (dc) power supply in which a radiofrequency
(RF) oscillator generates a low-voltage
alternating current (ac). This ac voltage is
stepped up by an RF transformer, and is finally
rectified to obtain high-voltage dc.
oscillator-type transmitter See OSCILLATOR
TRANSMITTER.
oscillator wavelength The fundamental wavelength
at which an oscillator operates. It is
usually expressed in meters, centimeters, or
millimeters. It can be determined by a tuned circuit,
crystal, cavity, section of waveguide or
transmission line, or by a resistance-capacitance
circuit.
oscillatory current A current that alternates periodically,
particularly the current in an inductance-capacitance
(LC) tank circuit that results