local oscillator


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local oscillator

See receiver.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

local oscillator

[′lō·kəl ′äs·ə‚lād·ər]
(electronics)
The oscillator in a superheterodyne receiver, whose output is mixed with the incoming modulated radio-frequency carrier signal in the mixer to give the frequency conversions needed to produce the intermediate-frequency signal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

local oscillator

In a superheterodyne radio, a local oscillator is an electronic circuit that generates a frequency based on the desired channel. The output of the oscillator is the channel frequency typically added to the intermediate frequency (IF). See PLL.
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References in periodicals archive ?
The impact of HWIs with regard to the number of local oscillators used at the base station is analyzed in [20] and [21].
In test 3, a local oscillator fault was introduced into the superheterodyne system, and then, as shown in Figure 7, the residual error began to have a larger wave range than before at t = 0.01 s, 0.025 s, 0.035 s.
Hence, the power of the local oscillator signal, i.e., the third harmonic component of the autonomous signal, varies with the power of the input RF signal [P.sub.RF].
Since the local oscillator is just a pair of delta functions this operation can be shown in figure 4 below.
* 300-23-GHz optical receiver including optical coherent receiver digitizer and local oscillator,
The mixing behavior of the circuit has been evaluated, varying the frequency of input signal from 38.6 GHz to 40 GHz and for a constant 36 GHz local oscillator frequency, at different power values of the input signal -10 dBm [less than or equal to] [P.sub.in] [less than or equal to] 10 dBm and of the local oscillator signal -5 dBm [less than or equal to] [P.sub.LO] [less than or equal to] 15 dBm.
A chirp signal with 80 MHz bandwidth is mixed with a 5.3 GHz signal from local oscillator using an up-converter mixer.
Other diodes D2, D3, D4 detect only standing wave, which is created due to interference of two waves, the received one and the wave from the local oscillator (Fig.
Operating at fixed frequencies in the 300 MHz to 22 GHz range, the APL-02 series of fundamental frequency phase-locked oscillators provides a low noise and stable local oscillator input for frequency converters for multiple uses.
Control of LNC local oscillator radiation as well as eventual DBS orbital spacing of two degrees demands sidelobe performance well in excess of most 4-GHz installations.
On the other hand, downconverting higher-frequency bands to baseband involves mixing with a suitable local oscillator (LO).