The 8 Best Spectrum Analyzers
Updated by · How we research
Eight RF spectrum analyzers compared by frequency reach, accuracy and tracking generators, pocket to bench. The tinySA Ultra+ ZS406 leads on value. When users buy our independently chosen editorial choices, we may earn commissions to help fund the Wiki.
The quickest way to ruin a spectrum analyzer is to plug a transmitter straight into it, because even a small handheld radio can burn out the input. Used with care, these radio instruments show how much signal sits at each frequency, which helps hams, drone pilots, Wi-Fi installers and students track down interference and tune antennas.
Editor's Notes
October 26, 2026, by Ezvid Wiki Editors:
A pocket analyzer now heads this list. The tinySA Ultra+ ZS406 reaches the Wi-Fi bands from a pocket-sized case, and an RF engineer's side-by-side of an earlier Ultra against a Rohde & Schwarz lab analyzer found its power readings close. The tinySA project's own list of safe sellers names the store behind it, which matters because clones circulate.
Three old picks had gone. The Oscium WiPry 2500x is no longer available, Anritsu discontinued the MS2721B, and the RF Explorer 6G Combo gave way to the RF Explorer 6G Combo Plus. We also dropped the Aursinc Nano, which is a NanoVNA that measures antennas rather than signals, and the Instrustar ISDS205A, a USB oscilloscope that tops out far below radio frequencies.
The SeeSii tinySA, Rigol DSA815-TG, Siglent SSA3021X and RF Explorer ISM Combo Plus stay. New picks add the tinySA Ultra+ ZS407 for drone video and newer Wi-Fi, and the Siglent SSA3032X for bench work in the 2.4 gigahertz band. Our evidence was the tinySA wiki, Rigol's and Siglent's spec sheets, the RF Explorer model table and Whitham Reeve's comparison paper.
Earlier notes
February 7, 2021, by Kaivaan Kermani:
One thing that has been improving in the spectrum analyzer/VNA market recently is the level of sophistication of portable models, especially with regard to display technologies and newer models like the Seesi TinySA offer a much clearer and sharper picture compared to the older RF models. I’ve still kept the RF models because of their range, and because the compact SA(Spectrum Analyzer) market is fairly limited, though I’ve decided to introduce a couple of newer compact models too. I’ve also added the Aursinc Nano as a VNA (Vector Network Analyzer or Vector Signal Analyzer) – technically and historically different from SAs, but more or less classified today as a sub-category of them. In contrast to the SA market, there is a plethora of compact VNAs on the market. The lines between SAs and VNAs are blurring, especially with regards to benchtop analyzers and newer models from companies like Siglent don’t even seem to make separate models anymore.
This isn’t so much the case with Digital Oscilloscopes, and despite many looking very similar to their SA cousins, the two types of instruments have fairly different capabilities – fundamentally, oscilloscopes analyze a signal in the time domain, whereas SAs/VNAs analyse the signal in the frequency domain. We do have a separate list for mainly benchtop digital oscilloscopes, as well as handheld digital oscilloscopes, which deserves its own list.
Focusing again on compact SAs, it was high time that I updated the older Oscium WiPry to the 5th and latest iteration of the award-winning model, the Oscium WiPry 2500x, which supports newer Android and IOS versions, as well as the latest Windows and Mac systems. It’s more or less the same as its predecessor, just slightly larger to accommodate for external charging and provide full functionality for newer IOS devices.
December 11, 2019, by Kaivaan Kermani:
For this update, I wanted to prioritize ease-of-use. Spectrum analyzers can generally be divided into 3 types: non-DIU’s (non-display interface units) or units that have no display unit and upload data onto a device with a display unit (laptop, tablet, PC) for analysis -these look like hard drives and include the Tektronix RSA306B, Oscium WiPry 5X and Instrustar ISDS205A; standalone units that look like microcomputers and have built-in display interfaces and on-board analysis and tracking generator features - these are the units that look like big microwaves and include the Rigol DSA815-TG Tracking, Siglent SSA3021X, Anritsu MS2721B and Siglent SSA3032, and; portable units that are handheld devices with display units and can also be plugged into a PC for analysis using compatible application software.
For ease of use, I wanted to prioritize portable units because of the obvious benefit of being able to carry them around. I removed the overpriced TTi PSA II and introduced 2 new models – RF Explorer ISM Combo Plus for VLF (Very Low Frequency) to UHF (Ultra High Frequency) bands, and the RF Explorer 6G Combo for the popular 2.4 GHz and 5.8 GHz (6G) frequency bands. While these models may not have the large range that some of the more expensive models have, these are ideal for job-site professionals who work within these specific and populated frequency ranges, and they’re so cheap.
I wanted to highlight standalone units next, because, while they’re not portable, all analysis features are on-board without the need to access external application software (which you often have to pay for if you want to access more advanced features). I’ve introduced the Siglent SSA3021X as a ‘tapered-down’ version of the Siglent SSA3032 (i.e. the SSA3021X is a cheaper option with a smaller frequency range).
Special Honors
Rohde & Schwarz FPL Rohde & Schwarz's FPL family is the kind of compact lab analyzer engineers use as a reference. It starts at 10 hertz and comes in versions that run to 3, 7.5, 14, 26.5 or 44 gigahertz, with far lower noise and better accuracy than any pocket unit. It is sold through the maker's sales channels at professional prices. rohde-schwarz.com
Siglent SVA1000X Siglent's SVA1000X series combines a spectrum analyzer and a vector network analyzer in one bench instrument, so it can check signals and also measure antennas, cables and filters. Siglent lists models that run to 1.5, 3.2 and 7.5 gigahertz, all starting at 9 kilohertz, and it is a current model line. siglentna.com
Start With The Frequencies You Need
Also check the bottom of the range: bench units start at 9 kilohertz, which matters for low-frequency interference and power-line noise.
Range decides almost everything. Shortwave, CB, aircraft, marine and most ham work sits below a few hundred megahertz, and the basic tinySA covers that range on its main input, with a rougher second input up to 960 megahertz. Wi-Fi and Bluetooth live at 2.4 gigahertz, so you need a model that reaches it: the tinySA Ultra+ in its high-frequency mode, the RF Explorer 6G and ISM models, or a bench unit such as the Siglent SSA3032X, which runs to 3.2 gigahertz (Siglent). Drone video links and Wi-Fi 6E sit at 5.8 and 6 gigahertz and above, which only the 7.3 gigahertz tinySA Ultra+ ZS407 and the 6 gigahertz RF Explorer reach in this list.
Nothing here is a true microwave analyzer. Lab instruments that run to tens of gigahertz, like the Rohde & Schwarz FPL and FSW families, cost thousands to tens of thousands of dollars. Also check the bottom of the range: bench units start at 9 kilohertz, which matters for low-frequency interference and power-line noise.
Resolution, Noise Floor And Tracking Generators
Resolution bandwidth (RBW) is the width of the filter the analyzer sweeps across the band. A narrower filter lowers the noise floor and separates signals that sit close together, but each sweep takes longer (Wikipedia). Pocket tinySA models go down to about 200 hertz; the Rigol DSA815-TG reaches 10 hertz and the Siglent SSA3000X series 1 hertz. Siglent rates the SSA3021X's total amplitude accuracy at plus or minus 0.7 decibels, while Whitham Reeve's comparison found the tinySA Ultra repeatable within about half a decibel (Reeve).
Most analyzers here are swept designs: they step across the band, so a very short burst can fall between sweeps. Keep that in mind when hunting intermittent interference.
A tracking generator sends a signal that follows the sweep, so you can plot how a filter, cable or antenna passes each frequency. The Rigol DSA815-TG and both Siglent models include one (Rigol). The tinySA has a separate signal generator, which is handy for testing receivers but is not the same as a bench tracking setup.
Protect The Input And Buy The Real Thing
The most common way to kill an analyzer is too much signal. The tinySA wiki lists a maximum input of +10 dBm, and Reeve suggests staying at or below 0 dBm, noting regular reports of damaged front ends on the project's forum (Reeve). The Rigol DSA815 tolerates +20 dBm with its attenuator set to 30 decibels and is damaged at 1 watt (Rigol). A 100-watt ham transmitter puts out 50 dBm, so never connect one directly: use a sampler or a high-power attenuator and a dummy load. Touch a grounded surface before handling the SMA ports, since static can damage them too.
The built-in signal generators transmit. Run them into a cable or dummy load rather than an antenna unless you're within your license or the unlicensed power limits.
The tinySA design is copied widely. The project keeps a list of safe places to buy, which includes the SeeSii and Aursinc stores and names sellers that have sold clones. We found no Consumer Product Safety Commission recalls for any brand on this page.
How we researched this
We compared 18 spectrum analyzers and related instruments, read the makers' spec pages for the 8 finalists, the tinySA project wiki and its list of approved sellers, and an RF engineer's published comparison of a tinySA Ultra against a Rohde & Schwarz lab analyzer, and checked every brand for recalls with the U.S. Consumer Product Safety Commission. Updated October 26, 2026 by Ezvid Wiki Editors.
Sources (11)
- tinySA wiki
- tinySA wiki: Where to buy
- Whitham Reeve: tinySA Ultra vs R&S FPL1003
- Rigol UK: DSA815-TG
- Rigol NA: DSA800 series
- Siglent NA: SSA3000X series
- RF Explorer: models
- Wikipedia: Spectrum analyzer
- Rohde & Schwarz: signal and spectrum analyzers
- Siglent NA: SVA1000X
- CPSC SaferProducts recall search
Frequently asked questions
Is this about audio spectrum analyzers?
No. This page covers radio-frequency instruments that measure signals from an antenna or cable. Audio spectrum analyzers are usually software plugins for music production.
What is the difference between a spectrum analyzer and an oscilloscope?
An oscilloscope shows voltage over time. A spectrum analyzer shows signal power at each frequency. Some oscilloscopes add an FFT view, but it only reaches as high as the scope's bandwidth, often tens of megahertz.
Is a NanoVNA a spectrum analyzer?
No. A NanoVNA is a vector network analyzer. It measures how an antenna, cable or filter behaves, such as SWR and impedance, by sending its own signal. It doesn't show the signals already on the air.
How accurate is a tinySA?
The tinySA project specifies about plus or minus 2 decibels. An RF engineer's comparison of the tinySA Ultra against a Rohde & Schwarz lab analyzer found the power readings nearly the same, with the lab unit far more repeatable.
Do I need a tracking generator?
Only if you plan to sweep filters, cables or antennas and see their response. For finding interference or checking a transmitter's output, a plain analyzer is enough.
Can I connect my ham radio to a spectrum analyzer?
Not directly. Even a few watts can destroy the input. Use a dummy load with a sampling port or a high-power attenuator so the signal reaching the analyzer stays within its rated limit.
