开云体育

Herb,
One thing I have not seen in the spec's so far is what the output level is.

Have you measured that or do you know what it is?

If I remember correctly the original version was in the -10 dbm range.

Thanks,
Joe - WA7JAW

Missed the first batch, any idea when will it be avaiable in Tindie again? or is there any other place to buy it?

btw the V2 team is not just me ;) I'm just the only one publicly talking about it and even then I don't use my real name ;)

I can confirm that currently the only way to exit USB mode is to toggle the power switch. I'll look into adding a register to allow changing modes.

The USB interface always outputs raw, uncalibrated values, as is in the user manual. The reason is the assumption that the PC software always has superior calibration routines (e.g. supporting arbitrary cal kit parameters) and it is far less error prone if you can't be confused whether you are reading calibrated or uncalibrate values.

The VNA logic in the firmware was written from scratch, and we haven't yet implemented calibration interpolation (it wasn't removed, just never implemented). Personally I've not had good experience with using interpolation on other VNAs that support it; I've found it to give wrong results every time unless you have an insanely high number of sweep points (1000). However if there is popular demand we can go and implement interpolation.

A correction to my review of the S-A-A-2. In addition to NanoVNA-QT, erik's last MOD of TAPR v4.6 located at /g/nanovna-users/files/NanoVNA%20PC%20Software/TAPR%20VNA/VNAR4.6.zip . also, supports the S-A-A-2. For some reason my Windows 10 computer was missing a couple of dll's that I had to track down, but once installed TAPR ran fine. An operating manual for TAPR 4.6 is also located at /g/nanovna-users/files/NanoVNA%20PC%20Software/ .

TAPR is currently the only software application that works across all NanoVNA variations.

The S-A-A-2 also goes into USB Mode (white screen with message) when connected to TAPR and after exiting the program, you still have to cycle power on the S-A-A-2 to regain manual control of it.


- Herb

erik,
I've been trying to transfer some of my NanoVNA scripts over to the S-A-A-2, and although its communicating, I'm operating blind. Any remote commands to the S-A-A-2 cause the screen to go white with the a "NanoVNA V2_2 USB MODE" message. There doesn't seem to be a command for exiting the USB Mode and the S-A-A-2 stays in that mode even after closing the serial port and exiting a script. The only way I have been able to exit the USB Mode and get back to a normal screen is by cycling power to the S-A-A-2.

Have you been able to find a reset or change mode command while modifying TAPR? Cycling power is not elegant. Actually, exiting the NanoVNA-QT program leaves the S-A-A-2 in the same state, which, is not the way to treat the user. This doesn't seem like Gabriel's usual attention to detail. In this area I would score one for the NanoVNA. I left an issue report at the GitHub page.

It also looks like the S-A-A-2 does not transfer corrected data over USB. Any external program or script will need to apply its own correction data. I don't envy Rune's effort to port NanoVNA-saver to this device. The communications protocol is totally different from the NanoVNA. Even enumerating the serial port required code changes, at least on my windows PC.

Additionally, it appears Gabriel decided to enforce re-calibration if the user changes frequency range. No more interpolation allowed. That's probably a good thing, but will puzzle some prior NanoVNA user's.

- herb

- Herb

- Herb

They're back in stock. I ordered one an hour ago - it'll be here Monday.

--
John AE5X

$79.95

I guess his DELETE button didn't work...
On Sat, Mar 28, 2020 at 2:37 PM, vaclav_sal via Groups.Io<vaclav_sal@...> wrote: As a very seldom poster here I cannot help to make the following comments,
"gained" from experience with few allegedly? technical forums.
Some of them amateur radio related, some not.

I will freely admit that I am not the best communicator when explaining my requests.

However, I am always trying to be a simpleton, generally on kindergarten level .
Thus I believe I posted very basic and simple question, I even asked for no sermons...

What " we have now.. is failure to communicate " , and this thread has been simply
hijacked to advertise / discuss virtues of Smith chart etc etc.
Nothing wrong with posting educational stuff about Smith chart,
but could you do it in ANOTHER , more appropriate thread ?

As a result, I will no longer monitor or contribute to this thread.
10-4

As a very seldom poster here I cannot help to make the following comments,
"gained" from experience with few allegedly technical forums.
Some of them amateur radio related, some not.

I will freely admit that I am not the best communicator when explaining my requests.

However, I am always trying to be a simpleton, generally on kindergarten level .
Thus I believe I posted very basic and simple question, I even asked for no sermons...

What " we have now.. is failure to communicate " , and this thread has been simply
hijacked to advertise / discuss virtues of Smith chart etc etc.
Nothing wrong with posting educational stuff about Smith chart,
but could you do it in ANOTHER , more appropriate thread ?

As a result, I will no longer monitor or contribute to this thread.
10-4

Good to know there are 3 ways to update the FW.?
Thanks Erik



On Sat, 28 Mar 2020 at 11:36 AM, erik@...<erik@...> wrote: On Sat, Mar 28, 2020 at 06:45 AM, Larry Rothman wrote:

Does the V2 have the port available for using an ST-link for flashing?

Yes,? I used CON303 pins connected to ST-Link for updating the SW of my pre-production model to v2.2
All the SW is on github so you can modify, build, updated as you like.

--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

Schematics, PCB, diagrams etc at:

On Sat, Mar 28, 2020 at 06:45 AM, Larry Rothman wrote:

Does the V2 have the port available for using an ST-link for flashing?

Yes, I used CON303 pins connected to ST-Link for updating the SW of my pre-production model to v2.2
All the SW is on github so you can modify, build, updated as you like.

--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

On Fri, Mar 27, 2020 at 04:10 PM, Gary Hale wrote:

This one is a newer version, NanoVNA-H:

As of 3/28 AURSINC at your link above seems to be out of stock. There is only one ebay seller offering Rev3.4 that I could find, but currently priced at $106.75 !!



What was the selling price at Amazon?

On Sat, Mar 28, 2020 at 06:45 AM, Larry Rothman wrote:

Does the V2 have the port available for using an ST-link for flashing?
=======================================================
Larry,
That's probably a question for Gabriel. Here's what I see on the accessible connectors ..

CONN303
- SWDIO
- SWIO
- GND
- NRST
- NC

J4
- SD_CLK
- SD_MOSI
- SD_MISO
- SD_CS

S301
- SWDIO
- SWCLK


J4 looks like a connector for future SD card addition. CONN303 and S301 have pins with ST-link like control names.

- Herb

Many, many thanks for the really wonderful comparison of the models.
I have a fairly early model, received in Mid-October, 2019 and hope to move up to a 4 inch model. Your comparison really helps!

Doug, K8RFT

Great write-up Herb!
Does the V2 have the port available for using an ST-link for flashing?



On Fri, 27 Mar 2020 at 10:10 PM, hwalker<herbwalker2476@...> wrote: ? ? I flipped a coin about three weeks ago and ordered an S-A-A-2 (NanoVNA-V2) analyzer for our ham club.? We already had one the other three variations (-H_v3.4, -H4 and -F) and have been very satisfied with their price to performance ratio. Adding the -V2 for testing above 2 GHz was an easy decision. The -V2 arrived today - about the same time as some other members have reported receiving their units.

? ? The NanoVNA-V2 was $65 usd from Tindie, including shipping.? Tindie filled the order promptly after receiving my PayPal payment, but then the shipment was stuck in transit at the Shanghai postal depot for over a week - most likely due to COVID-19 delays. Given the circumstances, 3-weeks for delivery was understandable. As of this writing Tindie is out of stock. There are two eBay sellers of the NanoVNA-V2, but they both are asking more than double the Tindie store price (no thanks!).

? ? The NanoVNA-V2 was developed by OwOComm under the design leadership of Gabriel Tena-White. Gabriel is well known and respected in the on-line technical community. OwOComm originally developed a VNA, let's call it the S-A-A-1, prior to the release of the NanoVNA without a display and a top end frequency of 300 MHz.? Before it could be manufactured, hugen's NanoVNA burst on the retail scene with display, a top end frequency of 900 MHz, and priced below $100. OwOComm met with its client and they decided not to manufacture the S-A-A-1 and instead started on a new development called the S-A-A-2.? OwOComm does not sell or manufacture the NanoVNA-V2. Sales and support are by the HCXQS group. HCXQS does not have a technical support forum or GitHub page that I could locate.? Their initial production run of NanoVNA-V2's appears to have been about 150 units (Tindie reported 144 orders before posting their out of stock notice).

? Un-wrapping:

? ? The NanoVNA-V2 came in a small cardboard box and was packed in bubble wrap, no accessories included.? The packing was sufficient to survive the 3-week land-air-land journey.

? ? The contents of the storage box included:
? ? ? NanoVNA-V2 (with no battery) Note: developer recommends 1000-2000 mAh Li-On batt, 6 x 40 x 60 mm, connector: JST-XH 2.54mm.
? ? ? No USB cable (micro USB data cable required for connecting to PC).
? ? ? No SMA RF cables (RG316, SS405, or RG405 cables recommended by designer).
? ? ? No SMA calibration kit.
? ? ? No SMA female to female connector for through calibration.

? ? ? If you don't already have any of the above accessories you will need to account for their cost in the overall purchase price of the NanoVNA-V2. My unit arrived un-calibrated and would not have been useable if I didn't already have a calibration kit.

? Immediate visual impression compared to the original NanoVNA

? ? The original 2.8" NanoVNA did not have a case and its power switch and multi-function thumb-wheel switch felt a bit flimsy. Subsequent -H and -H4 models have an ABS case that provide guards for the side mounted port connectors; additionally, the -H4 has better quality switches.
? ? ?
? ? The appearance of the NanoVNA-V2 harkens back to the original 2.8" NanoVNA. It has two PCB's sandwiched between standoffs with a 2.8" display on top. The multi-function thumb-wheel switch has been replaced by three small push button switches.? The push-button switches were placed between the SMA connectors so users designing a protective case will need to be imaginative.? The PCB version is marked as SAA V2_2.

? ? The NanoVNA-V2's 2.8" display will be a disappointment to user's hoping for a larger display.? My understanding from past posts by Gabriel (the board designer) is that a drop-in 3.2" display is available for user upgrade. The on-screen layout of the display will be immediately familiar to anyone who has used a previous NanoVNA variant. The display firmware seems to be based on edy555's ver 6.0 firmware.

? ? PC Software:

? ? None of the current PC software (NanoVNA-saver, NanoVNA-Sharp, TAPR, WebApp) work with the NanoVNA-V2.? Rune has ordered a NanoVNA-V2 and has indicated that he intends to support the device in NanoVNA-saver. Erik has also indicated that TAPR may support the NanoVNA-V2.? The NanoVNA-V2 has a native PC program called NanoVNA-QT Software. It is a port from an open source VNA program and some functions are not relevant to the NanoVNA-V2.

? I downloaded the USB-Serial port driver and NanoVNA-QT software from, .? There are installations for Windows (7+)? and Linux.? The Mac OS is not supported - yet. On Windows you have to load the driver package first. This went smoothly for me on Windows 10. The archive for NanoVNA-QT should be un-zipped to a desired directory and then the executable in the directory can be run without any install required.

? Using NanoVNA-QT is different than NanoVNA-Saver and takes some getting used to. It seems to have most of the features you would expect from this type of software and connected to the -V2 without issue - once the correct COM port was selected. From within the program you can perform up to 1024 point sweeps, which eclipses the 201 point maximum sweep on the device. Overall the program gives a good first impression, and for updating the firmware of the NanoVNA-V2 is the only available option.
?
? NanoVNA-V2 does not support terminal commands. I find it nice when using the NanoVNA to load up a terminal program and type in console commands to remotely program the device.? The design of the NanoVNA-V2 does not support doing this.? Gabriel indicated that a python class might possibly be ready when the V-2 was launched, but I was unable to use the one at , at least not in the way I use the class for the NanoVNA.
?
While the V-2 is connected to NanoVNA-QT, the display is blanked with a version message. When I closed the NanoVNA-QT program, I couldn't find a way of restoring the display for manual use without cycling power.

? ? In Use:

? ? Turning on the NanoVNA-V2 presented a version screen of NanoVNA V2_2? Jan 18 2020.? I checked the NanoVNA-V2 GitHub site for newer firmware releases but none were posted. You'll want to take care of what operations you perform until back-up firmware becomes available.? Updating the firmware, as previously noted requires NanoVNA-QT.? STM DfuSeDemo utility is a thing of the past.

? ? The specified NanoVNA-V2 frequency range is 50kHz - 3GHz, but as reported previously by Wolfgang, the top measurement frequency can be set to 4.5 GHz- with good performance to 3.5 GHz. The V-2 operates only using fundamentals and does not use harmonics for higher ranges as the other NanoVNA variants do. The waveforms from the two V-2 synthesizers are not sinusoidal so there are still plenty of harmonics in the output spectrum, but unlike the NanoVNA, you don't have base frequencies higher in amplitude than the signal you are generating.

? ? The menu structure for the NanoVNA-V2 mimics that of the NanoVNA. Calibration, Trace, Sweep and Marker settings all work the same. There are a couple of new options for setting the number of display points, and flipping the display orientation.

? Under the hood:

? The NanoVNA-V2 is powered by a GD32F303CCT6 processor. It has 48KB of SRAM and 256KB of flash memory which is comparable to the NanoVNA-H4.

? Published specifications are:
? 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: 2.8'', 320 x 240
? USB interface: Micro USB
? Power: USB, 300mA
? Battery: not included. Includes charging circuitry.
? Maximum sweep points (on device): 201
? Maximum sweep points (USB): 1024
? VNA-QT software supported platforms: Linux, Windows (7+), Mac OS planned
?
? Since the device arrived un-calibrated, the first order of business was to perform an OSLT cal. There were a few differences noted from the normal? NanoVNA OSLT calibration. The first was that there is no isolation step. The second is the save step does not change the display notation to the saved channel (i.e. saving to location 0 did not change the notation to C0). The third was that cycling power did not automatically recall save location 0.? The display always comes up in the un-corrected state and you have to manually recall 0 from the "RECALL" menu, at that point the C0 notation is displayed.
?
? I purchased a 1 - 2GHz BPF that I have been meaning to test and it seemed like a good candidate for the NanoVNA-2. The attached photo shows the filter measured from 20 MHz to 3 GHz. The filter skirts and band pass are as specified by the manufacturer.

? The NanoVNA-V2 is a welcome addition to my club's test instrumentation.? Judging by comments from some NanoVNA-H owners, the 2.8" display is going to be a disappointment.? If you can get by the display size and judge the NanoVNA-V2 on its performance and cost, you will be hard pressed to find a comparable 3 GHz device.



- Herb

On Sat, Mar 28, 2020 at 04:10 AM, Dallas KD4HNX wrote:

I'm looking to purchase my first NanoVNA and I'm overwhelmed by which one to get. By chance have you done reviews of the other VNAs your club has purchased??
==============================================================
Dallas,
You might want to check the review I did of the NanoVNA-H4 at /g/nanovna-users/message/10012 .

As a first time buyer I would limit my choices to the NanoVNA-H ver3.4, NanoVNA-H4, NanoVNA-F or S-A-A-2. The NanoVNA-H ver3.4 has the latest board modifications by hugen and limited measurement capability approaching 2 GHz. It is also the most supported version by firmware developers. Its drawbacks are a 2.8" display, slower processor, and limited flash memory. Almost all current software supports it.

The NanoVNA-H4 also has hugen's latest board modifications and limited measurement capability approaching 2 GHz. The 4" display is an improvement over the NanoVNA-H and it has more flash memory space and a faster processor. It should be more future proof than the NanoVNA-H. It is not as well supported by firmware developers as the NanoVNA-H. Currently hugen is the only developer with official firmware releases for the NanoVNA-H4. Almost all current software supports it. It is a fairly new product and problems with the case fitting has been reported by some users.

The NanoVNA-F has the best display of the NanoVNA variants. It is a 4.3" display with about twice the resolution of the NanoVNA-H4. It has more flash memory space and a faster processor than the NanoVNA-H which should make it more future proof. It has a metal housing versus the ABS housing of the NanoVNA-H v3.4 and NanoVNA-H4. It is not as well supported by firmware developers as the NanoVNA-H. Currently BH5HNU is the only developer with official firmware releases for the NanoVNA-F. Almost all current software supports it. The most current versions are 2.3 (Thumb wheel switch) and 3.1 (Push button switches). Older 2.2 versions are available at a discounted price, but have more limited capability than the newer versions.

The S-A-A-2 (NanoVNA-V2) is the only game in town if you want to make measurements up to 3 GHz (fairly good to 3.5 GHz). Its 2.8" display, lack of accessories, no protective housing, no battery and limited software/firmware support are its primary negatives. It currently has limited availability as its first production run was sold out within a month. Subsequent production runs may address some of the negatives I mentioned.

- Hope that helps.

- Herb

Herb,
First I want to thank you for such a detailed report/review of the S-A-A-2.
I'm looking to purchase my first NanoVNA and I'm overwhelmed by which one to get.
By chance have you done reviews of the other VNAs your club has purchased?? If so I'd love to read them...


73 Dallas, KD4HNX
Whatever you do, don’t fall victim to?“paralysis by
analysis.” Go ahead and buy/build one and start?
tinkering with it. This is a learn by doing hobby.

No politician or scholar assured your freedoms.
A Soldier, Sailor, Marine, or Airman did!

This is the 900Mhz version. I would get the 1.5 Ghz version

Bob M

I flipped a coin about three weeks ago and ordered an S-A-A-2 (NanoVNA-V2) analyzer for our ham club. We already had one the other three variations (-H_v3.4, -H4 and -F) and have been very satisfied with their price to performance ratio. Adding the -V2 for testing above 2 GHz was an easy decision. The -V2 arrived today - about the same time as some other members have reported receiving their units.

The NanoVNA-V2 was $65 usd from Tindie, including shipping. Tindie filled the order promptly after receiving my PayPal payment, but then the shipment was stuck in transit at the Shanghai postal depot for over a week - most likely due to COVID-19 delays. Given the circumstances, 3-weeks for delivery was understandable. As of this writing Tindie is out of stock. There are two eBay sellers of the NanoVNA-V2, but they both are asking more than double the Tindie store price (no thanks!).

The NanoVNA-V2 was developed by OwOComm under the design leadership of Gabriel Tena-White. Gabriel is well known and respected in the on-line technical community. OwOComm originally developed a VNA, let's call it the S-A-A-1, prior to the release of the NanoVNA without a display and a top end frequency of 300 MHz. Before it could be manufactured, hugen's NanoVNA burst on the retail scene with display, a top end frequency of 900 MHz, and priced below $100. OwOComm met with its client and they decided not to manufacture the S-A-A-1 and instead started on a new development called the S-A-A-2. OwOComm does not sell or manufacture the NanoVNA-V2. Sales and support are by the HCXQS group. HCXQS does not have a technical support forum or GitHub page that I could locate. Their initial production run of NanoVNA-V2's appears to have been about 150 units (Tindie reported 144 orders before posting their out of stock notice).

Un-wrapping:

The NanoVNA-V2 came in a small cardboard box and was packed in bubble wrap, no accessories included. The packing was sufficient to survive the 3-week land-air-land journey.

The contents of the storage box included:
NanoVNA-V2 (with no battery) Note: developer recommends 1000-2000 mAh Li-On batt, 6 x 40 x 60 mm, connector: JST-XH 2.54mm.
No USB cable (micro USB data cable required for connecting to PC).
No SMA RF cables (RG316, SS405, or RG405 cables recommended by designer).
No SMA calibration kit.
No SMA female to female connector for through calibration.

If you don't already have any of the above accessories you will need to account for their cost in the overall purchase price of the NanoVNA-V2. My unit arrived un-calibrated and would not have been useable if I didn't already have a calibration kit.

Immediate visual impression compared to the original NanoVNA

The original 2.8" NanoVNA did not have a case and its power switch and multi-function thumb-wheel switch felt a bit flimsy. Subsequent -H and -H4 models have an ABS case that provide guards for the side mounted port connectors; additionally, the -H4 has better quality switches.

The appearance of the NanoVNA-V2 harkens back to the original 2.8" NanoVNA. It has two PCB's sandwiched between standoffs with a 2.8" display on top. The multi-function thumb-wheel switch has been replaced by three small push button switches. The push-button switches were placed between the SMA connectors so users designing a protective case will need to be imaginative. The PCB version is marked as SAA V2_2.

The NanoVNA-V2's 2.8" display will be a disappointment to user's hoping for a larger display. My understanding from past posts by Gabriel (the board designer) is that a drop-in 3.2" display is available for user upgrade. The on-screen layout of the display will be immediately familiar to anyone who has used a previous NanoVNA variant. The display firmware seems to be based on edy555's ver 6.0 firmware.

PC Software:

None of the current PC software (NanoVNA-saver, NanoVNA-Sharp, TAPR, WebApp) work with the NanoVNA-V2. Rune has ordered a NanoVNA-V2 and has indicated that he intends to support the device in NanoVNA-saver. Erik has also indicated that TAPR may support the NanoVNA-V2. The NanoVNA-V2 has a native PC program called NanoVNA-QT Software. It is a port from an open source VNA program and some functions are not relevant to the NanoVNA-V2.

I downloaded the USB-Serial port driver and NanoVNA-QT software from, . There are installations for Windows (7+) and Linux. The Mac OS is not supported - yet. On Windows you have to load the driver package first. This went smoothly for me on Windows 10. The archive for NanoVNA-QT should be un-zipped to a desired directory and then the executable in the directory can be run without any install required.

Using NanoVNA-QT is different than NanoVNA-Saver and takes some getting used to. It seems to have most of the features you would expect from this type of software and connected to the -V2 without issue - once the correct COM port was selected. From within the program you can perform up to 1024 point sweeps, which eclipses the 201 point maximum sweep on the device. Overall the program gives a good first impression, and for updating the firmware of the NanoVNA-V2 is the only available option.

NanoVNA-V2 does not support terminal commands. I find it nice when using the NanoVNA to load up a terminal program and type in console commands to remotely program the device. The design of the NanoVNA-V2 does not support doing this. Gabriel indicated that a python class might possibly be ready when the V-2 was launched, but I was unable to use the one at , at least not in the way I use the class for the NanoVNA.

While the V-2 is connected to NanoVNA-QT, the display is blanked with a version message. When I closed the NanoVNA-QT program, I couldn't find a way of restoring the display for manual use without cycling power.

In Use:

Turning on the NanoVNA-V2 presented a version screen of NanoVNA V2_2 Jan 18 2020. I checked the NanoVNA-V2 GitHub site for newer firmware releases but none were posted. You'll want to take care of what operations you perform until back-up firmware becomes available. Updating the firmware, as previously noted requires NanoVNA-QT. STM DfuSeDemo utility is a thing of the past.

The specified NanoVNA-V2 frequency range is 50kHz - 3GHz, but as reported previously by Wolfgang, the top measurement frequency can be set to 4.5 GHz- with good performance to 3.5 GHz. The V-2 operates only using fundamentals and does not use harmonics for higher ranges as the other NanoVNA variants do. The waveforms from the two V-2 synthesizers are not sinusoidal so there are still plenty of harmonics in the output spectrum, but unlike the NanoVNA, you don't have base frequencies higher in amplitude than the signal you are generating.

The menu structure for the NanoVNA-V2 mimics that of the NanoVNA. Calibration, Trace, Sweep and Marker settings all work the same. There are a couple of new options for setting the number of display points, and flipping the display orientation.

Under the hood:

The NanoVNA-V2 is powered by a GD32F303CCT6 processor. It has 48KB of SRAM and 256KB of flash memory which is comparable to the NanoVNA-H4.

Published specifications are:
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: 2.8'', 320 x 240
USB interface: Micro USB
Power: USB, 300mA
Battery: not included. Includes charging circuitry.
Maximum sweep points (on device): 201
Maximum sweep points (USB): 1024
VNA-QT software supported platforms: Linux, Windows (7+), Mac OS planned

Since the device arrived un-calibrated, the first order of business was to perform an OSLT cal. There were a few differences noted from the normal NanoVNA OSLT calibration. The first was that there is no isolation step. The second is the save step does not change the display notation to the saved channel (i.e. saving to location 0 did not change the notation to C0). The third was that cycling power did not automatically recall save location 0. The display always comes up in the un-corrected state and you have to manually recall 0 from the "RECALL" menu, at that point the C0 notation is displayed.

I purchased a 1 - 2GHz BPF that I have been meaning to test and it seemed like a good candidate for the NanoVNA-2. The attached photo shows the filter measured from 20 MHz to 3 GHz. The filter skirts and band pass are as specified by the manufacturer.

The NanoVNA-V2 is a welcome addition to my club's test instrumentation. Judging by comments from some NanoVNA-H owners, the 2.8" display is going to be a disappointment. If you can get by the display size and judge the NanoVNA-V2 on its performance and cost, you will be hard pressed to find a comparable 3 GHz device.



- Herb