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A spectrum analyzer is a critical tool for measuring and visualizing radio frequency (RF) signals, used in applications such as wireless communications, audio analysis, electronic testing, and interference detection.
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While high-end brands like Agilent (now Keysight Technologies) offer premium spectrum analyzers with advanced features, many low-cost alternatives are available on the market.
This article compares Agilent (Keysight) spectrum analyzers with cheap spectrum analyzers, highlighting their differences in performance, accuracy, durability, and use cases to help you choose the right tool for your needs.
Table of Contents
What Is an Agilent Spectrum Analyzer?
Agilent Technologies, now Keysight Technologies, is a leading manufacturer of high-precision test and measurement equipment, including premium spectrum analyzers. These analyzers are designed for professional engineers, research labs, and advanced RF applications.
Features of Agilent (Keysight) Spectrum Analyzers
✔ High frequency range (typically from kHz to 50 GHz+)
✔ Superior accuracy and dynamic range
✔ Fast scanning and real-time signal analysis
✔ Advanced software features (modulation analysis, EMI testing, phase noise measurement)
✔ Industry-standard build quality for durability
✔ Compliance with regulatory standards (FCC, IEEE, etc.)
Popular Agilent/Keysight Spectrum Analyzers
- Keysight N9320B (9 kHz – 3 GHz) – A high-performance entry-level analyzer
- Keysight N9000B CXA (9 kHz – 26.5 GHz) – Designed for general RF testing
- Keysight MXA / EXA Series – High-end models with real-time analysis
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What Are Cheap Spectrum Analyzers?
Cheap spectrum analyzers are budget-friendly alternatives designed for hobbyists, students, and light-duty applications. These analyzers lack high-end accuracy, advanced features, and extensive frequency coverage but provide a cost-effective way to analyze RF signals.
Features of Cheap Spectrum Analyzers
✔ Affordable (typically under $500 compared to tens of thousands for Agilent models)
✔ Compact and portable
✔ Basic RF spectrum visualization
✔ Often uses software-defined radio (SDR) technology
✔ Limited frequency range and accuracy
Popular Cheap Spectrum Analyzers
- Rigol DSA815-TG (9 kHz – 1.5 GHz) – A low-cost alternative with good performance
- TinySA (Tiny Spectrum Analyzer) (100 kHz – 5.4 GHz) – Ultra-low-cost spectrum analyzer for basic RF work
- NanoVNA (Vector Network Analyzer) – Primarily a VNA, but can be used for spectrum analysis
- HackRF One (SDR) – A software-defined radio that functions as a basic spectrum analyzer
Agilent vs. Cheap Spectrum Analyzers: Key Differences
| Feature | Agilent (Keysight) Spectrum Analyzers | Cheap Spectrum Analyzers |
|---|---|---|
| Price | Expensive | Affordable |
| Frequency Range | Up to 50 GHz+ | Typically below 6 GHz |
| Accuracy | High precision, lab-grade | Lower accuracy, hobby-grade |
| Dynamic Range | Wide dynamic range, ideal for weak signals | Limited range, struggles with weak signals |
| Real-Time Analysis | Available in high-end models | Rare or limited |
| Software Support | Professional tools like Keysight VSA, MATLAB | Open-source software (SDR#, SigDigger) |
| Use Cases | R&D, compliance testing, telecommunications | Hobbyists, students, basic RF analysis |
Pros & Cons of Agilent vs. Cheap Spectrum Analyzers
Agilent (Keysight) Spectrum Analyzers
Pros:
✔ High accuracy and precision
✔ Wide frequency range (GHz-level signals)
✔ Excellent dynamic range and sensitivity
✔ Advanced modulation analysis and signal processing
Cons:
❌ Expensive, often costing thousands of dollars
❌ Larger and less portable
❌ May have a steep learning curve for beginners
Cheap Spectrum Analyzers
Pros:
✔ Very affordable and accessible
✔ Portable and lightweight
✔ Sufficient for basic RF testing and learning
Cons:
❌ Limited frequency range and accuracy
❌ Cannot handle high-power signals or weak signals accurately
❌ Lacks real-time analysis and advanced measurement features
Which Spectrum Analyzer Should You Choose?
Choose an Agilent (Keysight) Spectrum Analyzer If
✔ You need high precision and reliability for professional RF applications
✔ You work in research, telecommunications, or compliance testing
✔ Your budget allows for a high-end instrument with advanced features
Choose a Cheap Spectrum Analyzer If
✔ You are a hobbyist, student, or beginner learning RF analysis
✔ You need a portable, low-cost solution for simple measurements
✔ Your application doesn’t require high accuracy or GHz-level signals
Final Thoughts
If you need professional-grade accuracy, advanced analysis features, and high-frequency coverage, Agilent (Keysight) spectrum analyzers are the best choice.
However, if you’re a hobbyist or student looking for a cost-effective way to explore RF signals, cheap spectrum analyzers like the TinySA or HackRF One offer a great starting point.
