preselector


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preselector

[¦prē·si′lek·tər]
(electricity)
Device in automatic switching which performs its selecting operation before seizing an idle trunk.
(electronics)
A tuned radio-frequency amplifier stage used ahead of the frequency converter in a superheterodyne receiver to increase the selectivity and sensitivity of the receiver.
References in periodicals archive ?
Other spectrum analyzers would bypass the YIG preselector when doing work above 3.
The fluid transmission preselector gear change was a feature of Daimler.
For example, option 067 for Anritsu's MS2830A provides preselector bypass that supports 125-MHz wideband measurements to 43 GHz on an appropriately configured instrument.
The IF pan display shows all signals in the preselector pass band.
This general architecture places preselector filters as the first element in the tuner chain, followed by low gain (typically 10-15 dB), high-intercept preamplifiers, followed by an upconverting mixer, amplification and filtering at the first IF (nominally 22.
Honeywell says the KFD 840 can replace the KAS altitude preselector that goes with KFC-200/250 autopilots.
The new spectrum analyzer also features good channel flatness for all measurements due to a switched-filter preselector.
The receiver's superheterodyne-based design with programmable (tunable) input preselector and multiple IF bandwidths can support a wide range of telemetry and satellite applications.
The RF preselector breaks the channel IF into manageable frequency bands for the A/Ds.