QUOTE (from Dragen): Why do people insist on reinventing the wheel?

WHY: Because they don't take the time to use the search engines. They're
lazy and just want someone else to put out the small required effort.

Dave - WØLEV

On Sat, Dec 7, 2024 at 6:16 PM Dragan Milivojevic via groups.io
<d.milivojevic@...> wrote:

There are plenty of serial to BT or WiFi modules available that work
with NanoVNA practically out of the box. Why do people insist on
reinventing the wheel?


On Sat, 7 Dec 2024 at 14:39, Manfred Mornhinweg via groups.io
<manfred@...> wrote:

I would like to emphasize on the point Jim made: As long as you have an

USB cable running into the antenna's near field, it will affect the
measurement, even if an USB isolator or an RF isolation transformer is
used. Also any isolator or transformer has capacitance, and even if it's
just a few pF, this might be enough to cause an unacceptable measurement
error in some cases.

So I think that the best thing to do is to connect the NanoVNA directly

to the antenna, powered by its battery, and use any small battery-powered
device to translate between USB and a fiber optic cable. Then run that
fiber cable down outside the near field of the antenna, and interface it to
the readout software.

As an alternative a radio link could be used. On Wifi or similar.

If suitable low-cost converters can't be found, it should be simple

enough to write a program for an Arduino, to convert between USB and fiber,
or use an ESP32 with its built-in WiFi. In fact, given how easy it is to
use WiFi with the ESP32, it looks like the way to go!

With an ESP32 plus battery attached to the NanoVNA, there is just the

capacitance of this small pack to the surroundings, and that should be
really negligible on HF. But on VHF and higher even this is enough to
significantly affect the measurements.

Manfred

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*Dave - WØLEV*


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Dave - WØLEV