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I have been using my nanovna SAA2N for months without issues, and I bought it from R&L who is an authorized distributer of legitimate Nanovna's. This morning my issue started after I calibrated the unit. All of my traces were erratic (see attached picture). Smith chart is a mess of zig zags instead of arcs. I tried the following and nothing has fixed the issue. "Reset" and "Reset All" prior to calibration. Tried multiple frequency ranges and trace points. Tried using both cables. Tested the cables for shorts/continuity. Tested all three standards (short, open, load) with an ohm meter, unfortunately I don't have another set to try. Flashed the firmware. Opened up the case and confirmed good solder joints and continuity from the N connectors to the board. Wiggled the connections and nothing changed. Checked again when the battery was fully charged. Also tried using VNA View and got the same results. The unit was safely stored in the case between the last time it worked and now. What am I missing?

It looks like the cal may not be taking. RESET......COMPLETE
CAL.......STORE in a register. Go back and verify that the OSL displays as
it should. If not, OPEN CASE....INSTALL PROPER LOAD......from the inside
VERIFY WITH DMM that 50-ohms is measured correctly. All this to confirm
the center pin is mating correctly to the connector. Also do same with the
short and DMM.

Dave - W?LEV

On Fri, Mar 14, 2025 at 7:21?PM K3IY via groups.io <oconnorkl=
[email protected]> wrote:

I have been using my nanovna SAA2N for months without issues, and I bought
it from R&L who is an authorized distributer of legitimate Nanovna's. This
morning my issue started after I calibrated the unit. All of my traces
were erratic (see attached picture). Smith chart is a mess of zig zags
instead of arcs. I tried the following and nothing has fixed the issue.
"Reset" and "Reset All" prior to calibration. Tried multiple frequency
ranges and trace points. Tried using both cables. Tested the cables for
shorts/continuity. Tested all three standards (short, open, load) with an
ohm meter, unfortunately I don't have another set to try. Flashed the
firmware. Opened up the case and confirmed good solder joints and
continuity from the N connectors to the board. Wiggled the connections and
nothing changed. Checked again when the battery was fully charged. Also
tried using VNA View and got the same results. The unit was safely stored
in the case between the last time it worked and now. What am I missing?

--

*Dave - W?LEV*


--
Dave - W?LEV

I got an email response from NanoRFE support with some concerning information. They suggested that the hardware version of my SAA2N "is a clone" and many users have reported issues with it. I was puzzled because I did my research (or at least I thought I did), and all sources online said there's enough bad clones out there and if you're in the US avoid this by buying from R&L electronics. NanoRFE support pointed me to their website which has a listed of suppliers selling clones. To my surprise R&L electronics is on that list and they're noted to "keep selling clones despite not being asked to by the original developers". If this is indeed true I am very disappointed in R&L and will be giving them a call to discuss a possible resolution.

R&L was where I got my SAA2N. I also contacted them about the clone issue and I didn't get a reply back, that was 2 yrs ago.
________________________________
From: [email protected] <[email protected]> on behalf of K3IY via groups.io <oconnorkl@...>
Sent: Saturday, March 15, 2025 5:33 AM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Erratic traces with SAA2N

I got an email response from NanoRFE support with some concerning information. They suggested that the hardware version of my SAA2N "is a clone" and many users have reported issues with it. I was puzzled because I did my research (or at least I thought I did), and all sources online said there's enough bad clones out there and if you're in the US avoid this by buying from R&L electronics. NanoRFE support pointed me to their website which has a listed of suppliers selling clones. To my surprise R&L electronics is on that list and they're noted to "keep selling clones despite not being asked to by the original developers". If this is indeed true I am very disappointed in R&L and will be giving them a call to discuss a possible resolution.

they claim ALL (except their own) as clones ...

but they are all "brothers and sisters", cousins ..? ... etc etc

they all are made quite similar in circuit design

dg9bfc sigi

Am 15.03.2025 um 11:33 schrieb K3IY via groups.io:

The make up is one thing were the clones come in is the software and firmware that you cant make work or upgrade.
________________________________
From: [email protected] <[email protected]> on behalf of Siegfried Jackstien via groups.io <siegfried.jackstien@...>
Sent: Sunday, March 16, 2025 6:29 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Erratic traces with SAA2N

they claim ALL (except their own) as clones ...

but they are all "brothers and sisters", cousins .. ... etc etc

they all are made quite similar in circuit design

dg9bfc sigi

Am 15.03.2025 um 11:33 schrieb K3IY via groups.io:

I got an email response from NanoRFE support with some concerning information. They suggested that the hardware version of my SAA2N "is a clone" and many users have reported issues with it. I was puzzled because I did my research (or at least I thought I did), and all sources online said there's enough bad clones out there and if you're in the US avoid this by buying from R&L electronics. NanoRFE support pointed me to their website which has a listed of suppliers selling clones. To my surprise R&L electronics is on that list and they're noted to "keep selling clones despite not being asked to by the original developers". If this is indeed true I am very disappointed in R&L and will be giving them a call to discuss a possible resolution.

If you buy from RANDL, we can provide you with after-sales service.
But since we have discontinued the SAA2N for a long time, RANDL may not have the stock to replace it for you.
This is usually caused by a damaged RF switch on port1, if you can you can try to replace it yourself, model number MXD8641.

I bought the unit from R&L on Oct. 31, 2024.

I did an ohm reading between blocking capacitor on the circuit side CH0 port terminal and ground, as described in this blog post (), and my reading was 10.3k ohms. According to the blog post this is what the reading should be and possibly my MXD8641 is not blown.

I confirmed that short/open/load standards are measuring as they should at the terminals on the pcb board.

Can you send an uncalibrated image?

This is what it looks like when I reset the calibration.

The RF switch is damaged and can be restored by replacing the MXD8641.

I called R&L electronics today. They're going to replace the unit. A+ service from R&L.