preselector

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preselector

(ˌpriːsɪˈlɛktə)
n
(Telecommunications) a system that automatically connects a caller to a free line
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Software should allow for selection of a variety of spectrum analyzers or EMI receivers, preselectors, detection adapters, turntables, switch drivers, and signal generators or tracking generators.
Wideband power amplifiers and low noise amplifiers; signal purity processors; single wideband RF/IF up and down converters; superconducting devices; and tunable preselectors must be addressed by specific R&D actions not driven by the civilian market.
Other features of the synthesizer/RBC are preselectors for improved performance in dense signal environments, selectable IF bandwidths from 1 to 10 MHz, and low group delay, phase noise and amplitude ripple.
Detector log video and threshold detector amplifier, multiplexers, thin-line multiplexers, filters, miniature lumped element filters, detectors, limiters, channelizers, detector and filter modules, video and channelized receivers, microwave integrated assemblies, solid-state, multi-throw switches, switch/filter assemblies and switch filter preselectors.
Frequency counters that do not employ YIG preselectors also are able to perform accurate frequency measurements but are less able to deal with multiple signal environments, especially if the signal of interest is not the largest signal present.
Both use a YIG preselector to limit the portion of the RF spectrum appearing at the instrument's downconverter.
Engelson, "Skills Improve Spectrum Analysis With Preselectors," Microwaves & RF, December 1988.
The external mixer will bypass the internal preselector filter, thus eliminating the insertion loss of that device.
When band limiting preselectors are employed ahead of the IFM, the basic requirement is to maintain a zero dB RF SNR in the selected band.
Assuming gain in the preselectors, the sensitivity of both approaches is identical.
This makes it possible to customize it, depending on whether the user adds the microwave front ends and preselectors.
What altitude do you put in the altitude preselector? The safe answer is to only select the altitude for which you're cleared.