Summary of Instrument Core Parameters

Model: Rohde & Schwarz R&S FSG
Frequency Range: 9 kHz to 13.6 GHz
Analysis Bandwidth: 28 MHz (This is one of its key advantages, supporting wideband signal analysis)
Memory: 4M sample I/Q data (Used for storing raw data for in-depth analysis)
Condition: Excellent appearance, fully functional
Additional Service: Supports invoicing for corporate accounts

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Detailed Function Introduction and Advantage Analysis

1. Wide Frequency Range (9 kHz - 13.6 GHz):
This range covers the vast majority of commonly used frequency bands, from low frequencies (such as audio, AM broadcasting) to microwaves (such as satellite communications, radar, microwave point-to-point links).
Typical Applications: Mobile communications (testing of GSM, CDMA, WCDMA, LTE base stations), Wi-Fi (2.4GHz & 5GHz), broadcasting (FM/TV), satellite signals (C-band, X-band), and avionics testing, etc.

2. 28 MHz Demodulation Bandwidth:
This is a standout feature of the FSG. Ordinary or older spectrum analyzers may only have a few MHz of analysis bandwidth.
Advantages: Can capture and analyze very wide bandwidth signals at once, for example:
Modern digital communication signals: Such as LTE signals, which may require over 20MHz of bandwidth for complete analysis.
Multi-carrier systems: Simultaneously analyze multiple adjacent carriers.
Transient signals and pulse signals: More completely capture pulse waveforms.
Signal scanning: Faster scanning of wide frequency bands.

3. 4M Sample I/Q Memory:
This means the FSG is not only a spectrum analyzer but also has Vector Signal Analysis (VSA) capabilities.
I/Q data is the raw baseband representation of a signal. Storing this data allows you to perform:
In-depth offline analysis: Capture and save signal data, then perform detailed analysis on a computer using professional software (such as R&S VSA software).
Modulation quality analysis: Measure EVM (Error Vector Magnitude), constellation diagrams, eye diagrams, etc., which are crucial for R&D and troubleshooting.
Signal demodulation: Can demodulate various types of signals (such as AM, FM, PM, ASK, FSK, PSK, QAM, etc.) and analyze their quality.

4. Condition and Functional Status:
"Excellent appearance" typically means the device has minimal external wear, with the screen, buttons, and interfaces all in good condition, without obvious physical damage.
"Fully functional" is an important assurance, meaning all core functions and testing accuracy have been verified to meet specification standards. For used instruments, it is beneficial to provide a recent calibration report to prove that performance indicators are still within tolerance.

5. Invoicing for Corporate Accounts:
This is very important for institutional purchases by enterprises, universities, research institutes, etc., facilitating accounting and reimbursement, and is a key aspect of formal transactions.

Applicable Scenarios and User Groups

RF Labs and R&D: Used for testing circuit boards, modules, and antennas in R&D.
Production Testing: Although speed may not match newer models, it can still be used for high-quality inspection of certain products.
Educational Institutions: Used by universities and technical colleges for teaching experiments; it is a comprehensive and powerful teaching tool.
Field Maintenance and Installation: Used for installation, debugging, and maintenance of communication base stations, broadcast transmitters, and other facilities.
Quality Inspection and Certification: Pre-compliance EMC testing and RF performance verification of electronic products.

Things to Check Before Purchase

1. Calibration Date: Inquire about the last calibration date. Rohde & Schwarz recommends annual calibration. A new calibration certificate greatly ensures the instrument's accuracy.
2. Option List: Confirm which software options are activated on this FSG (e.g., specific demodulation formats, pulse analysis, EMC pre-compliance testing, etc.). Options determine the richness of functions.
3. Accessory Condition: Check if necessary power cables, calibration certificates (even if expired), manuals, etc., are included. Verify the condition of RF cables, attenuators, and other accessories.
4. Test Verification: If possible, request a demonstration of basic functions, such as frequency setting, amplitude measurement, bandwidth measurement, and I/Q data capture.
5. Price Comparison: Research the approximate prices of FSG models with similar conditions on the used instrument market (e.g., eBay, domestic professional used instrument dealers) to ensure the quoted price is reasonable.

Summary

This R&S FSG is a powerful, high-performance used spectrum analyzer. Its 28MHz analysis bandwidth and I/Q data capture capabilities elevate it beyond ordinary spectrum analyzers into the realm of vector signal analysis. For users who need to analyze modern wideband communication signals but want to control costs, this is a highly cost-effective choice.

As long as its condition is as described—"fully functional"—and it comes with a recent calibration certificate, it is fully capable of handling professional-level RF testing tasks.


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