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AURSINC NanoVNA SAA-2N V2.2 Vector Network Analyzer, 50KHz-3GHz HF VHF UHF VNA Antenna Analyzer Ham Radio with Storage Bag, Measuring S Parameters, Duplexer, VSWR, Phase, Delay

4.3 4.3 out of 5 stars 230 ratings

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Purchase options and add-ons

Antenna Radio
Brand AURSINC
Color Black
Number of Channels 2
Maximum Range 50 Meters
UPC 753318593367
Manufacturer AURSINC

About this item

  • ✔️【Upgraded V2.2 Version】The SAA-2N is a two port T/R (transmission/reflection) VNA which can measure the S parameters S11 & S21 of a two port network, or the reflection coefficient(S11) of a one port network. The nano vna saa-2n has a 4.0 inch touch screen for easier data reading and testing. It is constructed with a durable and practical metal shell, and comes with a carrying bag for portability
  • ✔️【Frequency range】The frequency range of the SAA-2N antenna analyzer is 50kHz to 3GHz. Transmission Mearsure S21: 70dB (50KHz-1.5GHz), 60dB (1.5GHz-3GHz); Reflection Measure S11: 50dB (50KHz-1.5GHz), 40dB (1.5GHz-3GHz); Antenna Analyzer: 1.005 (50KHz - 1.5GHz), 1.02 (1.5GHz-3GHz)
  • ✔️【PC Connection】The NanoVNA SAA-2N can be controlled by PC via VNA-QT software, supported for Linux, Windows (7+), Mac OS planned. It also support Nanovna-Saver for extracting the data for display on a computer, and for saving to Touchstore files
  • ✔️【Compliance】The NanoVNA-SAA-2N developed by Hugen, designed in collaboration with OwOComm. Under the LGPL license agreement, it is completely manufactured according to the v2_2 files issued by OwOComm at Development Department, in line with the original technical specifications
  • ✔️【Calibration】The NanoVNA_V2.2 uses a similar user interface to the NanoVNA, but with a different technical architecture. The SAA-2N does not load the initial calibration data at startup, and does not automatically interpolate the calibration data after the user changes the frequency, must recalibrate or call back the calibration data after each startup and frequency change. Please read the user manual carefully before use to avoid damaging the device
  • ✔️【Packing List】1* NanoVNA SAA-2N Host (Metal Shell, 3000mAh lithium-ion Battery); 1* Micro USB Data Cable; 2* 50cm N-type Male to Male RG142-PUR RF Cable; 1* N-type Male Calibration Kit-OPEN; 1 * N-type Male Calibration Kit-SHORT; 1* N-type Male Calibration Kit-LOAD; 1* N-type Female to Female Connector; 1* EVA Storage Bag for carrying out; 1*Touching Screen Paddle and Lanyard
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AURSINC NanoVNA SAA-2N V2.2 Vector Network Analyzer, 50KHz-3GHz HF VHF UHF VNA Antenna Analyzer Ham Radio with Storage Bag, Measuring S Parameters, Duplexer, VSWR, Phase, Delay

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This item: AURSINC NanoVNA SAA-2N V2.2 Vector Network Analyzer, 50KHz-3GHz HF VHF UHF VNA Antenna Analyzer Ham Radio with Storage Bag, Measuring S Parameters, Duplexer, VSWR, Phase, Delay
$124.99
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Product Description

NanoVNA SAA-2N V2.2 Antenna Analyzer 50kHz-3GHz, 4inch Touchscreen Display with Storage Bag for Ham Radio

nanovna saa-2n

Support S11 S21 Parameter Measurements

  • Transmission Mearsure S21: 70dB (50KHz-1.5GHz), 60dB (1.5GHz-3GHz)
  • Reflection Measure S11: 50dB (50KHz-1.5GHz), 40dB (1.5GHz-3GHz)
  • Antenna Analyzer: 1.005 (50KHz - 1.5GHz), 1.02 (1.5GHz-3GHz)

NanoVNA SAA-2N

saa-2n v2 antenna analyzer

NanoVNA SAA-2N

Improved Performance: 50kHz-3GHz

The NanoVNA SAA-2N V2.2 Antenna Analyzer provides perfect vector network measurement capabilities.

Constructed with a metal shell, reduce the external interference and improve the measurement accuracy stability.

Battery: 3000mAh lithium-ion

Built-in 3000mah rechargeable lithium battery, can work continuously for more than 8 hours, with type-C charging cable and LED charging indicator.

USB interface: Micro USB, battery powered or USB-C powered

With the carrying bag for carrying out

The SAA-2N V2.2 is lightweight and portable, allowing users to bring it on-site for efficient measurements in different environments.

4.0 inch touch screen, easier for you to read data and test.

nano vna saa-2n

Tech Specification

Frequency range 50kHz - 3GHz
System dynamic range (calibrated)70dB (up to 1.5GHz), 60dB (up to 3GHz)
S11 noise floor (calibrated) -50dB (up to 1.5GHz), -40dB (up to 3GHz)
Sweep rate 100 points/s
Display 4'' touchscreen (320 x 480 pixel)
USB interface Micro USB
Power USB, Maximum charge current 1A
Battery 3000mAh lithium-ion
Battery connector JST-XH 2.54mm
Maximum sweep points (on device): 201
Maximum sweep points (USB): 1024
Port 2 return loss (1.5GHz): 20dB typ
Port 2 return loss (3GHz): 13dB min
VNA-QT software supported Platforms: Linux, Windows (7+), Mac OS planned
NANOVNA-saa-2n
antenna analyzer
nanovna saa-2n nanovna nanovna v2 plus5 7in NanoVNA SV4401A LIBREVNA NanoVNA V3
NanoVNA SAA-2N V2.2 NanoVNA V2 PLUS4 NanoVNA V2 PLUS4 Pro (PLUS5) 7in NanoVNA SV4401A LibreVNA 2.0 NanoRFE VNA6000
Customer Reviews
4.3 out of 5 stars
230
4.5 out of 5 stars
17
4.5 out of 5 stars
17
4.0 out of 5 stars
16
Price $124.99 $249.88 $729.88 $879.99
Display 4 inch 4 inch 4 inch 7 inch X 4 inch
Frequency range 50kHz-3GHz 50kHz-4GHz 50kHz-4GHz 50kHz-4.4GHz 100KHz-6GHz 50kHz-6GHz
Case Metal Shell Metal Shell Metal Shell Metal Shell Metal Shell Metal Shell
With Storage Bag

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AURSINC NanoVNA SAA-2N V2.2 Vector Network Analyzer, 50KHz-3GHz HF VHF UHF VNA Antenna Analyzer Ham Radio with Storage Bag, Measuring S Parameters, Duplexer, VSWR, Phase, Delay
AURSINC NanoVNA SAA-2N V2.2 Vector Network Analyzer, 50KHz-3GHz HF VHF UHF VNA Antenna Analyzer Ham Radio with Storage Bag, Measuring S Parameters, Duplexer, VSWR, Phase, Delay
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Price$124.99$147.99$59.99-10% $107.99
List:$119.99
$89.99
Delivery
Get it as soon as Tuesday, Aug 20
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Get it as soon as Tuesday, Aug 20
Get it as soon as Wednesday, Aug 21
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Customer Ratings
Touch Screen
4.1
4.6
4.4
4.3
4.8
Accuracy
4.0
4.5
4.4
4.4
4.4
Easy to use
3.7
4.3
3.9
3.9
4.2
Value for money
4.3
4.4
4.7
4.5
Sold By
AURSINC
HUAIFANGPING
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HUAIFANGPING
antenna description
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Radio
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AURSINC NanoVNA SAA-2N V2.2 Vector Network Analyzer, 50KHz-3GHz HF VHF UHF VNA Antenna Analyzer Ham Radio with Storage Bag, Measuring S Parameters, Duplexer, VSWR, Phase, Delay


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Customer reviews

4.3 out of 5 stars
230 global ratings

Customers say

Customers like the quality of the antenna, mentioning it's very functional for hobby and minor field work. They appreciate the value. However, some customers dislike calibration. Opinions are mixed on connector, construction, performance, ease of use, and screen.

AI-generated from the text of customer reviews

23 customers mention "Quality"23 positive0 negative

Customers are satisfied with the quality of the antenna. They mention that it is very functional for hobby and minor field work, and a great little tool. Some say that it makes the unit much more usable and is super useful to a ham.

"...who has previously purchased the NanoVNA series knows, its very functional for hobby and minor field work...." Read more

"...This makes this unit very useable for frequent repeated antenna tests...." Read more

"...N cables are bulkier and stiffer than the SMA cables, but are great for antenna work...." Read more

"Good for line analysis and sweeps." Read more

17 customers mention "Value"17 positive0 negative

Customers appreciate the value of the antenna. They mention that it's a nice low cost testing device, accurate for the cost and size.

"...Fantastic piece of gear for the money!" Read more

"...Seems very accurate, and very durable in its metal chassis. The price is reasonable for what you get. Buy this, you’ll appreciate the quality." Read more

"...systems and other related electronic projects this is a nice low cost testing device that just a few years ago a full size tester with the same..." Read more

"This is an amazing VNA for the money. The user interface is easy-to-use. Calibration was easy...." Read more

27 customers mention "Construction"18 positive9 negative

Customers are mixed about the construction of the antenna. Some mention it's well built, solid, and amazing at the quality. They like the much more durable N-type connectors as opposed to the delicate SMA types found on other antennas. However, others say that it seems overly fragile and won't stand up to even the slightest bit of pressure. They also say that the connector to board SNA is not well soldered and that it didn't last.

"...I am nearly giddy with amazement, because not only is the construction of the product (full metal case) solid built, but hardware is really quite..." Read more

"The VNA has nice a solid enclosure. the Type N cables are bulkier and stiffer than the SMA cables, but are great for antenna work...." Read more

"...The printed instructions that came with the unit are very, very basic however there are lots of online resources that can help you master this Nano..." Read more

"...VNA Saver works fine. As for the device itself, it seems solid, and appears to work well...." Read more

19 customers mention "Performance"11 positive8 negative

Customers are mixed about the performance of the antenna. Some mention that it seems solid and works well, while others say that it fails. The VNA-QT software does not work with this device on Windows 10, and the screen has failed. The unit stopped working within a week.

"I've been using the NanoVNA for a couple of weeks and it works well and I am pleased with the purchase...." Read more

"...Buy one, buy two. Give them to friends. It works very well, much better than one could expect or hope...." Read more

"...I really like everything else about this unit, but it will not work with NanoVNA QT so you cannot update the firmware, where the H4 you can...." Read more

"I obtained this in November 2020. It worked great and connected to Windows 7 and Windows 10...." Read more

15 customers mention "Ease of use"7 positive8 negative

Customers are mixed about the ease of use. Some mention it's amazingly easy to use and understand, and it'll exceed your expectations. They say the software is well written, and the antenna is easy to calibrate and set up. However, some customers say it came with no instructions, user manual, or documentation. It takes some learning to appreciate the device, and hard to figure out the menus.

"...one link is dead. it talks about male and female kits. just stupid crazy confusing...." Read more

"This is an amazing VNA for the money. The user interface is easy-to-use. Calibration was easy...." Read more

"...needs to be calibrated prior to first use, and the manufacturer doesn’t provide any documentation other than a menu tree.Very disappointing." Read more

"...PROS: low cost, easy to use, Easy to calibrate and set up.CONS: the first unit came with the wrong calibration items...." Read more

11 customers mention "Connector"7 positive4 negative

Customers have mixed opinions about the connector of the antenna. Some say the N connectors are a plus, the quality of the cables is great, and the RF connectors seem much better than the SMA connectors on other antennas. However, others say that the COM port no longer be recognized after a Windows 10 update, the unit had a bad USB port, and that the connectors were not well soldered.

"...Some Big Pros I see with this unit:N connectors! I don't really trust flimsy SMAs for long-term use like most of them have...." Read more

"...Well that connector wasn't well soldered and became disconnected from the board...." Read more

"...The cables are great and everything else is as advertised. I have not decided if I'm going to keep it though...." Read more

"...The N connectors were a plus since most decent pieces of test gear use N connectors as they can tolerate 100s of cycles of connect/disconnect...." Read more

9 customers mention "Screen"5 positive4 negative

Customers have mixed opinions about the screen of the antenna. Some like the larger display, bright screen, and clear screen. Others however, report issues with the display going blank or white.

"...The plots seems smooth without a lot of noise.Nice bright screen! Case holds all accessories, though it is a tight fit...." Read more

"...The silkscreen is very faint as well (as stated in the print on Amazon), which seems strange to me, but that is not an issue for me other than it..." Read more

"...what is going on in a network. As I am older, the larger display is better. First thing out of the box, charge the battery...." Read more

"...days ago, in the middle of doing an antenna measurement, the display went blank/white. Rebooting had no effect, updating firmware had no effect...." Read more

7 customers mention "Calibration"2 positive5 negative

Customers are dissatisfied with the calibration of the antenna. They mention that the unit came with incorrect calibration standards, and that it would not calibrate properly. Some customers also mention that it is very inaccurate at frequencies below 10 MHz.

"...The unit came with the incorrect calibration standards. I believe the seller has a notice regarding this...." Read more

"...Unfortunately the new unit would not calibrate properly...." Read more

"...Provides more capability, but the beauty of this is quick accurate tests in the field just stand-alone. Recommending for the moment." Read more

"...CONS: the first unit came with the wrong calibration items. But the manufacturer and Amazon resolve the issue immediately...." Read more

Initial tests seem good.
5 out of 5 stars
Initial tests seem good.
Out of box experience overall: Not bad!Couple of minor negatives to get out of the way: The case is steel. Consequently it is a lot heavier than it needs to be, and subject to rust. Would have preferred aluminum for obvious reasons. The screening on the case is essentially unreadable. Good news is there are few things to label. RF N Port 0 is the one closest to a protruding tab. Menu open is center button, other buttons are up / dn navigate, or just use the touch screen. Finger or included stylus. Also a USB:C would be preferred I'm guessing for many, but the USB mini cables are plentiful plus it is supplied with one. No on-screen batt voltage indication, but the 3 LEDs on the back that are grouped together show a 100/66/33 % power left indication and seem accurate enough. While charging each LED will sequentially blink to show charging status until all are solid.illumination. Seems to charge quickly from standard phone charger. (2 to 3 hrs)YouTube is your friend for quick start. They are all very similar in operation.Some Big Pros I see with this unit:N connectors! I don't really trust flimsy SMAs for long-term use like most of them have.You can Calibrate for a particular freq range and save to a slot. Comes with calibration slugs. Slot 0 is recalled at power up. Config settings such as screen rotate are also recalled at startup. This makes this unit very useable for frequent repeated antenna tests.You can turn it on an test an swr sweep or other tests in seconds! Easy to recall other calibrations for other ranges/antennas from other slots. 10 slots. Attached photo tests a commercial airband antenna and to my surprise it was right in spec. No more guessing about antennas whether commercially purchased or home built! Up to 201 scanning points per selected freq range compared to half that for most nanovna units. The plots seems smooth without a lot of noise.Nice bright screen! Case holds all accessories, though it is a tight fit. You should be able to fit in a couple extra adapters such as UHF or SMA but that's about it. Haven't used PC software yet. Provides more capability, but the beauty of this is quick accurate tests in the field just stand-alone. Recommending for the moment.
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Top reviews from the United States

Reviewed in the United States on September 22, 2020
Just arrived today and I am totally blown away by this little compact 3GHz capable VNA for $130 bucks. I am nearly giddy with amazement, because not only is the construction of the product (full metal case) solid built, but hardware is really quite capable. As anyone who has previously purchased the NanoVNA series knows, its very functional for hobby and minor field work. This unit, the SAA-2N V2.2 is the latest in the NanoVNA series which now includes 'N' type RF connections instead of SMA. Most engineers and HAM enthusiasts will appreciate that when you need to connect to antennas outside, or test receiver LNA's and downstream equipment, you likely need to use N-type connections. Noting that it is totally possible to use N-to-SMA adapters for the earlier models, the problem lies in the fact that when you attach a heavy N-type cable to a same fragile SMA adapter, you run the risk of snapping it in two, but not so with this unit. The SAA-2N V2.2 has the same good RF performance for S-parameter measurements as previous models, so I won't cover that in this review. Having the screen now at a pleasant 4 inches is very helpful compared to the earlier 2.7", and 3.2" versions. The specs have conflict when it comes to battery capacity, in the graphic images is a comparison that says it has 3000mA/Hr but down in the text area of the spec it states 1950mA. I will have to report back to really see which is correct. I own a very nice HP8753C vector network analyzer along with several calibration kits. I ran some tests using the HP85032B cal kit on my VNA and then testing each of the three hardware cal adapters that came with the SAA-2N V2.2 . The Short and Open have virtually no difference and the RF 50ohm Load held better than -30dB return loss at 3GHz, which is really not bad. That is a VSWR: of 1.065. Using a 10dB attenuator on S11 port, yielded a near perfect -19.96dB return loss. The two N-Type to N-Type 20.5" long cables are pretty good, and able to maintain a -23dB return loss out to 3GHz, which is better than Port 2 can perform at (-13dB RL).
I really am impressed at what it can do and all that is included for the price. I now can have a portable VNA virtually anywhere I go. And if you need a hardcopy of your measurements, you can download the free PC software from GITHUB which will allow the VNA to output data via the USB port to the computer and then you can save it in S2P or CSV for later. (You have to make the measurement while using the software, and you can't save it on the instrument and then later print it via the PC.)
Fantastic piece of gear for the money!
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5.0 out of 5 stars Unbelievable 3GHz VNA with 4" Screen and CAL Hardware
Reviewed in the United States on September 22, 2020
Just arrived today and I am totally blown away by this little compact 3GHz capable VNA for $130 bucks. I am nearly giddy with amazement, because not only is the construction of the product (full metal case) solid built, but hardware is really quite capable. As anyone who has previously purchased the NanoVNA series knows, its very functional for hobby and minor field work. This unit, the SAA-2N V2.2 is the latest in the NanoVNA series which now includes 'N' type RF connections instead of SMA. Most engineers and HAM enthusiasts will appreciate that when you need to connect to antennas outside, or test receiver LNA's and downstream equipment, you likely need to use N-type connections. Noting that it is totally possible to use N-to-SMA adapters for the earlier models, the problem lies in the fact that when you attach a heavy N-type cable to a same fragile SMA adapter, you run the risk of snapping it in two, but not so with this unit. The SAA-2N V2.2 has the same good RF performance for S-parameter measurements as previous models, so I won't cover that in this review. Having the screen now at a pleasant 4 inches is very helpful compared to the earlier 2.7", and 3.2" versions. The specs have conflict when it comes to battery capacity, in the graphic images is a comparison that says it has 3000mA/Hr but down in the text area of the spec it states 1950mA. I will have to report back to really see which is correct. I own a very nice HP8753C vector network analyzer along with several calibration kits. I ran some tests using the HP85032B cal kit on my VNA and then testing each of the three hardware cal adapters that came with the SAA-2N V2.2 . The Short and Open have virtually no difference and the RF 50ohm Load held better than -30dB return loss at 3GHz, which is really not bad. That is a VSWR: of 1.065. Using a 10dB attenuator on S11 port, yielded a near perfect -19.96dB return loss. The two N-Type to N-Type 20.5" long cables are pretty good, and able to maintain a -23dB return loss out to 3GHz, which is better than Port 2 can perform at (-13dB RL).
I really am impressed at what it can do and all that is included for the price. I now can have a portable VNA virtually anywhere I go. And if you need a hardcopy of your measurements, you can download the free PC software from GITHUB which will allow the VNA to output data via the USB port to the computer and then you can save it in S2P or CSV for later. (You have to make the measurement while using the software, and you can't save it on the instrument and then later print it via the PC.)
Fantastic piece of gear for the money!
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Reviewed in the United States on August 24, 2022
Out of box experience overall:

Not bad!

Couple of minor negatives to get out of the way:

The case is steel. Consequently it is a lot heavier than it needs to be, and subject to rust. Would have preferred aluminum for obvious reasons.

The screening on the case is essentially unreadable. Good news is there are few things to label.

RF N Port 0 is the one closest to a protruding tab.

Menu open is center button, other buttons are up / dn navigate, or just use the touch screen. Finger or included stylus.

Also a USB:C would be preferred I'm guessing for many, but the USB mini cables are plentiful plus it is supplied with one.

No on-screen batt voltage indication, but the 3 LEDs on the back that are grouped together show a 100/66/33 % power left indication and seem accurate enough.

While charging each LED will sequentially blink to show charging status until all are solid.illumination. Seems to charge quickly from standard phone charger. (2 to 3 hrs)

YouTube is your friend for quick start. They are all very similar in operation.

Some Big Pros I see with this unit:

N connectors! I don't really trust flimsy SMAs for long-term use like most of them have.

You can Calibrate for a particular freq range and save to a slot. Comes with calibration slugs.

Slot 0 is recalled at power up.

Config settings such as screen rotate are also recalled at startup. This makes this unit very useable for frequent repeated antenna tests.
You can turn it on an test an swr sweep or other tests in seconds!

Easy to recall other calibrations for other ranges/antennas from other slots. 10 slots.

Attached photo tests a commercial airband antenna and to my surprise it was right in spec.

No more guessing about antennas whether commercially purchased or home built!

Up to 201 scanning points per selected freq range compared to half that for most nanovna units. The plots seems smooth without a lot of noise.

Nice bright screen!

Case holds all accessories, though it is a tight fit. You should be able to fit in a couple extra adapters such as UHF or SMA but that's about it.

Haven't used PC software yet. Provides more capability, but the beauty of this is quick accurate tests in the field just stand-alone.

Recommending for the moment.
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5.0 out of 5 stars Initial tests seem good.
Reviewed in the United States on August 24, 2022
Out of box experience overall:

Not bad!

Couple of minor negatives to get out of the way:

The case is steel. Consequently it is a lot heavier than it needs to be, and subject to rust. Would have preferred aluminum for obvious reasons.

The screening on the case is essentially unreadable. Good news is there are few things to label.

RF N Port 0 is the one closest to a protruding tab.

Menu open is center button, other buttons are up / dn navigate, or just use the touch screen. Finger or included stylus.

Also a USB:C would be preferred I'm guessing for many, but the USB mini cables are plentiful plus it is supplied with one.

No on-screen batt voltage indication, but the 3 LEDs on the back that are grouped together show a 100/66/33 % power left indication and seem accurate enough.

While charging each LED will sequentially blink to show charging status until all are solid.illumination. Seems to charge quickly from standard phone charger. (2 to 3 hrs)

YouTube is your friend for quick start. They are all very similar in operation.

Some Big Pros I see with this unit:

N connectors! I don't really trust flimsy SMAs for long-term use like most of them have.

You can Calibrate for a particular freq range and save to a slot. Comes with calibration slugs.

Slot 0 is recalled at power up.

Config settings such as screen rotate are also recalled at startup. This makes this unit very useable for frequent repeated antenna tests.
You can turn it on an test an swr sweep or other tests in seconds!

Easy to recall other calibrations for other ranges/antennas from other slots. 10 slots.

Attached photo tests a commercial airband antenna and to my surprise it was right in spec.

No more guessing about antennas whether commercially purchased or home built!

Up to 201 scanning points per selected freq range compared to half that for most nanovna units. The plots seems smooth without a lot of noise.

Nice bright screen!

Case holds all accessories, though it is a tight fit. You should be able to fit in a couple extra adapters such as UHF or SMA but that's about it.

Haven't used PC software yet. Provides more capability, but the beauty of this is quick accurate tests in the field just stand-alone.

Recommending for the moment.
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Reviewed in the United States on February 5, 2021
The VNA has nice a solid enclosure. the Type N cables are bulkier and stiffer than the SMA cables, but are great for antenna work. There is a learning curve on using a VNA for the first time, YouTube is your friend for this. My use initially will be for antenna work and some other things like balum (or unun) measurements. I also have some old COAX that needs testing for quality. The 200, vs 100 on earlier models, data points will allow a better picture of
what is going on in a network. As I am older, the larger display is better. First thing out of the box, charge the battery. I did not see an easy way to measure the battery voltage, but I have not been thru all the menu items yet. There are 4 LEDs on the back that seem to act as a charge state indicator. The calibration plugs are hard to read in dim light. Getting some coax adapters is a good Idea, I had some already.
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Reviewed in the United States on October 4, 2021
Good for line analysis and sweeps.

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Ricardo Orozco
5.0 out of 5 stars Excelente equipo y trato
Reviewed in Mexico on April 19, 2021
No olviden pedir elnkit complementario
Arnulfo Vargas Jauregui
4.0 out of 5 stars Buen equipo
Reviewed in Mexico on August 14, 2021
En general buen equipo, buena relacion costo calidad, lo recomiendo, muy robusta su construcción.

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Legal Disclaimer

please refer to below path get the firmware updated: drive.google.com/drive/folders/1Lr7AOTg2pAhYBZDfaiPVZTMZkFO14PMj NOTE: The new batch of SAA2N analyzers have been upgraded to the laser labeling on the control dashboard, so you might find it difficult to read at the first sight, the former labeling is easy to fade after long-time usage.