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So many smmall devices and somjetimes power supplies generate RFI.
Would it be possible to add a sensor to assist in detection, identifion and measuring RFI from such devices.
Seems a logical extension but I do not have technical skill to know how it might be doen.
It would certainly need something to prevent the Nanovna being overwhelmed by powerful signals.
Would be really useful to have such capability in the shack
David M0TAU

The NANOVNAs are not the proper instrument to use for sleuthing RFI. A
battery powered receiver in the AM band is excellent. Also, the TinySA is
a small highly affordable spectrum analyzer which is suited for the
purpose.



Dave - W?LEV

On Fri, Jul 8, 2022 at 2:46 PM David Southwell <David.Southwell@...>
wrote:

So many smmall devices and somjetimes power supplies generate RFI.
Would it be possible to add a sensor to assist in detection, identifion
and measuring RFI from such devices.
Seems a logical extension but I do not have technical skill to know how it
might be doen.
It would certainly need something to prevent the Nanovna being overwhelmed
by powerful signals.
Would be really useful to have such capability in the shack
David M0TAU

--
*Dave - W?LEV*
*Just Let Darwin Work*


--
Dave - W?LEV

If you can put together a small computer / display with an RTL-SDR unit,
that would work great for that purpose. My favorite USB SDR unit so far is
the FunCube dongle.

Zack W9SZ

On Fri, Jul 8, 2022 at 10:44 AM W0LEV <davearea51a@...> wrote:

The NANOVNAs are not the proper instrument to use for sleuthing RFI. A
battery powered receiver in the AM band is excellent. Also, the TinySA is
a small highly affordable spectrum analyzer which is suited for the
purpose.



Dave - W?LEV

On Fri, Jul 8, 2022 at 2:46 PM David Southwell <
David.Southwell@...>
wrote:

So many smmall devices and somjetimes power supplies generate RFI.
Would it be possible to add a sensor to assist in detection, identifion
and measuring RFI from such devices.
Seems a logical extension but I do not have technical skill to know how

it

might be doen.
It would certainly need something to prevent the Nanovna being

overwhelmed

by powerful signals.
Would be really useful to have such capability in the shack
David M0TAU

--
*Dave - W?LEV*
*Just Let Darwin Work*


--
Dave - W?LEV

<>
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<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

That may be true now but with the constant advance in technology and miniaturisation it seems quite likely future developments will add a substantial range of test capabilities to miniaturised NVA's. This will not be welcomed by manufacturers of expensive single purpose devices. Basically the hardware and software requirements for spectrum analysis within these NVA's lend themselves to adding RFI analysis capabilities to these test instruments.

David Southwell ARPS EFIAP CPN(g)
Party Wall Surveyor,
Commercial Property Developer and Consultant
Photographer
________________________________
From: [email protected] <[email protected]> on behalf of W0LEV via groups.io <davearea51a@...>
Sent: Friday, July 8, 2022 16:44
To: NANO VNA <[email protected]>
Subject: Re: [nanovna-users] NanoVNA Is it possibel to add RFI capability

The NANOVNAs are not the proper instrument to use for sleuthing RFI. A
battery powered receiver in the AM band is excellent. Also, the TinySA is
a small highly affordable spectrum analyzer which is suited for the
purpose.



Dave - W?LEV

On Fri, Jul 8, 2022 at 2:46 PM David Southwell <David.Southwell@...>
wrote:

So many smmall devices and somjetimes power supplies generate RFI.
Would it be possible to add a sensor to assist in detection, identifion
and measuring RFI from such devices.
Seems a logical extension but I do not have technical skill to know how it
might be doen.
It would certainly need something to prevent the Nanovna being overwhelmed
by powerful signals.
Would be really useful to have such capability in the shack
David M0TAU

--
*Dave - W?LEV*
*Just Let Darwin Work*


--
Dave - W?LEV

My favorite SDR is from AirSpy. Excellent quality and SW (free) support.

Dave - W?LEV

--
Dave - W?LEV

Well.. you already see the multifunction capability (Spectrum Analyzer, 1 direction VNA) in popular instruments like the Keysight Fieldfox, and similar devices from Anritsu, etc.

There will always be a market for single purpose devices - highly cost (or size/weight/power) constrained applications where you don't want to spend the extra pennies for the components; and where you need the ultimate in measurement performance. It's like counters and spectrum analyzers - both can measure the frequency of a signal, but they tend to have different reference oscillators (ADEV vs Phase Noise optimization) and because they use different measurement techniques, they are optimized for particular applications. Another example might be precision measurement of RF power - a broadband calorimetric power meter or a narrow band filter with a detector (what a spectrum analyzer is). Getting 0.5% accuracy from a broadband power meter is straightforward, getting 0.1% uncertainty is difficult, but possible. I don't think there's a spectrum analyzer made that has that kind of accuracy. Typically, it's more like 0.2 or 0.5 dB (5% - 12%).