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Hey guys

just got a nano VNA. it is a "seesii, nano VNA-H.

I need some help in setting it up to see the SWR on some antennas. I have gone through the various manuals and the one that came with it, and I am very confused.

Basically what I am looking to do is (to me ) very simple. Input a start frequency, lets say 144 MHz. A stop frequency, say 152 MHz. The see the lowest SWR point as an inverted bell curve.

Anyone have any ideas how to do this? Also, I cannot seem to find the correct software for the device. I know my cable is good (as I can get data off my cell phone with it) but i cant the nano VNA to be recognized.

Please help.


Howard

Welcome to the group!

The archives of this group contain much good information including videos
and a guide for the VNAs for DUMMIES. Those resources should get you
going.

Dave - W?LEV

On Thu, Mar 20, 2025 at 5:37?PM Howard via groups.io <n9ktw=
[email protected]> wrote:

Hey guys

just got a nano VNA. it is a "seesii, nano VNA-H.

I need some help in setting it up to see the SWR on some antennas. I have
gone through the various manuals and the one that came with it, and I am
very confused.

Basically what I am looking to do is (to me ) very simple. Input a start
frequency, lets say 144 MHz. A stop frequency, say 152 MHz. The see the
lowest SWR point as an inverted bell curve.

Anyone have any ideas how to do this? Also, I cannot seem to find the
correct software for the device. I know my cable is good (as I can get data
off my cell phone with it) but i cant the nano VNA to be recognized.

Please help.


Howard

--

*Dave - W?LEV*


--
Dave - W?LEV

"NanoVNAs Explained" by Mike Richards G4WNC is the goto book you need,
available from a number of Internet shops.

73 DE G4SDW Gareth

Well, simply put:

First, do an OSL calibration for the range you want to use, and store it in
one of the memories.

Then select Display > S11 > SWR. It should then display the SWR of whatever
is connected to the S11 (upper) connector.

Very simple.

Zack W9SZ

<>
Virus-free.www.avg.com
<>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Thu, Mar 20, 2025 at 12:37?PM Howard via groups.io <n9ktw=
[email protected]> wrote:

Hey guys

just got a nano VNA. it is a "seesii, nano VNA-H.

I need some help in setting it up to see the SWR on some antennas. I have
gone through the various manuals and the one that came with it, and I am
very confused.

Basically what I am looking to do is (to me ) very simple. Input a start
frequency, lets say 144 MHz. A stop frequency, say 152 MHz. The see the
lowest SWR point as an inverted bell curve.

Anyone have any ideas how to do this? Also, I cannot seem to find the
correct software for the device. I know my cable is good (as I can get data
off my cell phone with it) but i cant the nano VNA to be recognized.

Please help.


Howard

Howard,

I used the SMA to SMA jumper cables which came with the Nano VNA and
calibrated using the open, short and load connectors (
). Then I used an SMA to SO239 adapter on the
jumper cables as my antennas have PL259 termination and it worked well.
Somehow it did not work well when I used PL259 open, short and load for
calibration.

If your antennas have SMA termination, then there is no need to use the
adapter. I did not use any software other than the built-in software in the
Nano VNA.

73
Jon, VU2JO

On Thu, Mar 20, 2025 at 11:07?PM Howard via groups.io <n9ktw=
[email protected]> wrote:

Hey guys

just got a nano VNA. it is a "seesii, nano VNA-H.

I need some help in setting it up to see the SWR on some antennas. I have
gone through the various manuals and the one that came with it, and I am
very confused.

Basically what I am looking to do is (to me ) very simple. Input a start
frequency, lets say 144 MHz. A stop frequency, say 152 MHz. The see the
lowest SWR point as an inverted bell curve.

Anyone have any ideas how to do this? Also, I cannot seem to find the
correct software for the device. I know my cable is good (as I can get data
off my cell phone with it) but i cant the nano VNA to be recognized.

Please help.


Howard