Product Description:
Agilent Technologies, Inc. 85685A RF Preselector, 20Hz to 2GHz, Spectrum Analyzer
The Agilent Technologies, Inc. 85685A spectrum analyzer is a wide band, very sensitive receiver. It works on the principle of "super-heterodyne receiver" to convert higher frequencies (normally ranging up to several 10s of GHz) to measurable quantities. The received frequency spectrum is slowly swept through a range of pre-selected frequencies, converting the selected frequency to a measurable DC level (usually logarithmic scale), and displaying the same on the CRT of the Agilent Technologies, Inc. 85685A. The CRT displays received signal strength (y-axis) against frequency ( x-axis).
Some applications for Agilent Technologies, Inc. 85685A Spectrum Analyzers include Site Monitoring: Verify that the frequency and signal strength of your transmitter is accurate. Interference: Before a system is installed you use a Agilent Technologies, Inc. 85685A spectrum analyzer to verify that the frequencies (you plan to use) are not occupied or if the presence of a very strong signal will interfere with your new setup. Interference can be created by a number of different situations. Other tests that utilize the Agilent Technologies, Inc. 85685A spectrum analyzer features include antenna isolation, co-channel interference, adjacent channel power, occupied bandwidth, intermodulation, microwave or satellite antenna alignment, and characterization of components.
Feature:Minimum Frequency: 20Hz
Maximum Frequency: 2GHz
Measurements With A General-Purpose Spectrum Analyzer
Add the HP 85685A RF Preselector to the HP 8565B or 8568B general-purpose spectrum analyzer, and you have a test receiver for specialized applications. The RF Preselector enhances these high-performance spectrum analyzers with tracking filters and preamplifiers that cover the 20Hz to 2GHz range. The spectrum analyzer / test receiver is sensitive to low-level signals while providing overload protection from out-of-band signals. The result, for tests in the presence of high-level interference, is a measurement range 30 dB greater than that of the spectrum analyzer alone. (The improvement is even greater in the presence of broadband pulse-interference.)
The test receiver is easy to operate; simply use the spectrum analyzer controls without concern for preselector settings. The preselector automatically adjusts input-filter tracking, and the spectrum analyzer reports preselector operating conditions on the CRT di Ave. Pwr: +30dBm (1W)
SWR: <1.5:1
Attn Range: 0-50dB
Preamplifier Gain: 20dB
Output Line Ampl: -40 - -60dBm
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