On Mon, Jun 3, 2024 at 07:07 PM, Bruce Hawkins wrote:

> I'd still would not store the unit turned on, between your legs.?

In search of a cheap thrill I just stuffed my Tiny SA Ultra in my
pants.

Nothing happened.

I want a refund ;-)

73 de Andy

Let's not further confuse the issue WRT Ionising and Non-Ionising radiation.

Some folks are already scared enough...

On Mon, Jun 3, 2024 at 04:31 PM, josephlevy wrote:

It's the LO sweeping ,coming via mixer leakage.

A LNA will get it way down (reverse isolation) which Erik already hinted at...

I just checked mine

Preamp off and no attenuation -60dBm.

That is such a small value, that most of the on-line RF power convertors indicate it as 0 watts, because they can't show enough zeros behind the decimal point. To put this in further context, Broadcast FM radio signals generally produce signal levels of around -50dBm inside their coverage area.

Preamp on and no attenuation -90dBm. An even smaller value.

Digital noise when sweeping -65dBm

Adding input attenuation reduces the leakage by the same amount of attenuation that is applied.

A lot of these instruments just scare people, by either not working as advertised, or by showing that something is present, without quantifying if it is likely to be dangerous.

I have worked on high power transmitter sites throughout my life, and some were working at power levels sufficient to light up a small fluorescent tube, without any other connection to a power supply. RF exposure is problematic, and can be dangerous, but NOT at the power levels you are observing, by a factor of several million.

If you are worried about RF exposure, then please try to better understand what you are measuring, and the associated power levels you are observing.

Regards,

Martin

Have you put two Safe and Sound Pro II devices side-by-side to quantify the RFI emissions from your Safe and Sound Pro II? I mean, as an electro hypersensitive person, you could quite possibly be made sick by your Safe and Sound Pro II device as opposed to the TinySA.

开云体育

Also look up the "Gibbs Phenomenon", which illustrates how a square wave is constructed fom the addition together of a sine wave and it's odd harmonics. The more harmonics, the closer the result is to a square wave.

Hi people

It's the LO sweeping ,coming via mixer leakage.

A LNA will get it way down (reverse isolation) which Erik already hinted at...

EVERY device that contains digital electronics will emit a tiny amount of RF. That includes the calculator sitting on your desk, the quartz clock hanging on the wall, your digital camera, any alarm clock with digits, and the list goes on. There does not have to be any "radio" involved. Not to mention the radiation (gasp!) we all get every day from broadcast stations, paging systems, police/fire/ambulance radios, weather radar, vehicle collision avoidance systems, cell phones, etc. Even your kitchen Farady cage (microwave oven) will have a teeny tiny amount of leakage. We are awash in EM fields. And this is not a new thing. Jupiter for example emits radio waves that are detectable on shortwave receivers. The sun does as well. Analog radio receivers also radiate RF.

The inverse square-law is our friend here.

73

-Jim
NU0C

On Mon, 03 Jun 2024 08:43:34 -0700
"Matt Harris via groups.io" <kd4pbs@...> wrote:

An RF related device which has a microprocessor running at RF frequencies and RF generating components which emits finite amounts of RF.

Who would have thunk it?

An RF related device which has a microprocessor running at RF frequencies and RF generating components which emits finite amounts of RF.

Who would have thunk it?

On Mon, Jun 3, 2024 at 08:47 AM, <torito1774@...> wrote:

it detects levels of up to 2,500 ?W/m? of RF signals when placed close to the TinySA Ultra's antenna.

Maybe it does, but have you calculated just how low a value of radiated power that equates to ?



It is miniscule.

Regards,

Martin

On Mon, Jun 3, 2024 at 01:47 AM, <torito1774@...> wrote:

This presents a double trouble. Firstly, it might give false positives by detecting it's own signals, I mean how can we measure RF signals when the measuring device emits signals at the very same time? Secondly, and this is also a main concern for me, as an electro hypersensitive person I bought this device in order to detect RF signals to be able to avoid them as they make me sick, but this device generates more RF pollution than the one I'm trying to avoid in the first place. Maybe someone has a solution on how to desactivate the generated signals.

Can you test if enabling the build-in LNA (LEVEL/LNA) suppresses this leakage sufficiently?

--

Hello guys,
My new TinySA Ultra generates signals while sweeping. I have a Safe and Sound Pro II meter and it detects levels of up to 2,500 ?W/m? of RF signals when placed close to the TinySA Ultra's antenna. This presents a double trouble. Firstly, it might give false positives by detecting it's own signals, I mean how can we measure RF signals when the measuring device emits signals at the very same time? Secondly, and this is also a main concern for me, as an electro hypersensitive person I bought this device in order to detect RF signals to be able to avoid them as they make me sick, but this device generates more RF pollution than the one I'm trying to avoid in the first place. Maybe someone has a solution on how to desactivate the generated signals. Some help from Erik would be nice. I attached 2 videos but I can send provide more on request

On Sun, Jun 2, 2024 at 06:24 AM, <undeclarede@...> wrote:

I use TinySA in environment very close to speakers that produce magnetic field and currents and have concerns how speakers can affect measurements of TinySA?
Should it be isolated from such sources or it doesn't matter?
Thank you!

Erm, no.

Thankfullly no magnetic tape is used in the Tiny SA / Ultra ;-)

- Andy -

On Sun, Jun 2, 2024 at 12:15 AM, <undeclarede@...> wrote:

Thank you! Does it mean that having a speaker connected to TinySA will introduce some kind of interference??

Normally not, unless the amplifier of the speaker is a bad class D (digital) amplifier

In one of your video tutorial there was mentioned that TinySA connected to PC via usb cable can also affect measurements. And now I’m curious to understand more:

This only happens when you connect a antenna or an E-field sensor, not if you use a coax to connect to a source

- does connected headphones affect measurements??

No

- is it technically possible to replace headphones with a speaker and preserving correctness of measurements or having very small interference? For instance, wire a small (1W) speaker through amplifier which is powered from mainboard of TinySA (VCC and GRND connectors)?

Should be OK when using an analog amplifier, not one of those cheap 5 V digital amplifiers

?
--

Thank you! Does it mean that having a speaker connected to TinySA will introduce some kind of interference??

In one of your video tutorial there was mentioned that TinySA connected to PC via usb cable can also affect measurements. And now I’m curious to understand more:
- does connected headphones affect measurements??

- is it technically possible to replace headphones with a speaker and preserving correctness of measurements or having very small interference? For instance, wire a small (1W) speaker through amplifier which is powered from mainboard of TinySA (VCC and GRND connectors)?

Thanks!

As long as the tinySA is not electrically connected to the speaker there should be no problem
--

I use TinySA in environment very close to speakers that produce magnetic field and currents and have concerns how speakers can affect measurements of TinySA?
Should it be isolated from such sources or it doesn't matter?
Thank you!