Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

classic Classic list List threaded Threaded
36 messages Options
12
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

earthworm
This post was updated on .
If you do not mind a meter with a large antenna ( that does not fit in your pocket ), i would recommend in your case a Gigahertz HF, preferable one with sound ( like the HF35C or the HF38B ) which helps to identify the type of the predominant radiation.
You could also wait in the hope that the frequency range of the HF38B will be extended within one or two years to include the 5G band from 3 to 4 GHz.
https://www.gigahertz-solutions.de/en/measurement/high-frequency/hfrf-overview/
https://www.gigahertz-solutions.de/en/5g/frequencies-and-meters/
Never measure within a meter from an emf source like a modem or a mobile phone, as that may damage a meter.
More handy to carry around and cheaper are the Cornets, which seem to me a better deal than other low quality RF-meters.
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

black-sun
In reply to this post by earthworm
I wouldn't quickly reach a conclusion about Safe and Sound Classic.
How do you know for sure that Safe and Sound Classic is crap?

Until IMST GmbH or some other third party lab tests Safe and Sound Classic, I wouldn't discount it.
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

black-sun
In reply to this post by earthworm
Even your near-field probes measure above 1MHz instead of 1KHz or 50KHz.
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

earthworm
This post was updated on .
These are not "mine", i'm just responding and trying to help.
With a crab internal wide range antenna inside the Safe&Sound, what can one expect ?
Compare it for fun with :
https://www.aaronia.com/Datasheets/Antennas/Omni-directional-Antenna_OmniLOG30800.pdf
Of course some of the deviation may be corrected by the device in theory, but better do not count on that.
With an external and larger 600 euro wide range antenna, the frequency response curve is still far from good.

The Safe&Sound is new on the market, the Cornets have been improved during many years, and are much cheaper.
So if you want a crab meter, a Cornet likely gives better value for buck.
This is my estimation, do as you wish.
A RF-meter with a log-per antenna is bound to be clearly superior to one with a cheap internal antenna.
An exception, if any, would only prove the rule.

I do not remember to have written or read anything about 1kHz or 50kHz regarding the probes.
An ME3851A is supposed to handle this area and should work at normal distances.
and/ or consider something like this : https://aaronia-shop.com/products/mdf-magnetic-direction-finder
Well, that is also rather pricey unfortunatedly.


Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

black-sun
I don't know what you mean by crap.....

It is a subjective word. I would rather see a response curve.

https://www.youtube.com/watch?v=xUGVA_5DB_M and https://www.youtube.com/watch?v=d2XyAeFETeI give insights into cornet and safe and sound.
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

black-sun
In reply to this post by earthworm
Do you know anything that can measure anything above 200khz or 50khz with some accuracy?
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

earthworm
In reply to this post by black-sun
i would rather see independant and proper testing than any supplied curve or specification.
in my view you simplify and ignore a lot, good luck with it anyway.


Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

black-sun
> in my view you simplify and ignore a lot

I just don't think there are enough data points to generalize that all internal antennas are crap.
So far, I have seen just a few data points.

In general, expensive antennas are better, but they may be expensive for other reasons than actual quality.
They may be expensive due to more functionality or rarity.
I don't know enough about EMF meter antennas. I'm just not yet comfortable with reaching a definite conclusion.
I want to know how they are constructed and why they are cheap or expensive and their price structures before reaching a conclusion. Proprietary standards also tend to raise prices artificially. If an external antenna conforms to proprietary standards, it may be a lot more expensive than it should be.

My policy is to not reach a definite conclusion until I have done research sufficiently.
You may have done a lot of research. I haven't. I'm still building up cases.

If you want to help me build up cases, tell me price structure of external and internal antennas.

> i would rather see independant and proper testing than any supplied curve or specification.

Independent test results would be best. But, I don't have any independent test result, yet.
According to my brief research, Safe and Sound Classic seems better than TriField TF2 and Cornet ED88T(Plus).
In fact, I received Safe and Sound Classic a few days ago. Safe and Sound Classic is a lot more sensitive to short pulses than TriField TF2. Safe and Sound Classic also measures a broader frequency range of electromagnetic radiation.
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

earthworm
Your approach sounds good.
However you do not get or forget half of what i wrote, and perhaps it is also a lot of nonsense, whatever, i won't keep answering.
The RF-function of the TF2 is rudimentary ( very crappy ) but this pleasant to work with instrument is much cheaper and includes reasonable electric and magnetic field meters, the latter even in 3D, although the weighted scales seem not that reliable.
As a layman i already noticed four tricks in the test by the makers of the Safe&Sound, so there are probably a dozen or so.
For instance it is the small peak-hold numbers on the TF2 that matter for these short pulses and these remain vague and ignored.
The intonation of the voices in these promotion videos also indicate dishonesty.

Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

black-sun
I have both TriField TF2 and Safe and Sound Classic. I noticed a few things about them.

* TriField TF2 can detect 13.65MHz which is frequency for HF(High Frequency) RFID. It taught me that RFID readers are dangerous.
* Safe and Sound Classic catches a lot of short pulses that TriField TF2 fails to catch.
* TriField TF2 is very very very very insensitive to 5Ghz WiFi, but Safe and Sound Classic is sensitive to both 2.4Ghz WiFi and 5Ghz WiFi.
* Safe and Sound Classic is small and easy to carry around in my pocket. It is discreet. It is not conspicuous. I use it frequently in front of people. TriField TF2 may arouse suspicion.
* TriField TF2 can detect whether an electronic device is grounded. But, it's not accurate for electric field.

I wouldn't rely on TriField TF2 for short pulses and anything above 3Ghz.
While TriField TF2 is nice to have, I'm going to sell it due to lack of money. It sucks to not have enough money.

I don't deny that 9CI may be deceiving customers. But, my Safe and Sound Classic seems good enough in comparison to TriField TF2.

I may buy RF Explorer 6G for measuring low frequencies when I have more money. If you discover any better product, please recommend here.
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

black-sun
In reply to this post by black-sun
I researched RF Explorer and concluded that I have to buy an expensive antenna for RF Explorer to measure electromagnetic radiation above 50khz in near field.

I'm beginning to think that it's hard to beat the combination of Tecsun PL-310ET, a portable analogue AM radio, and a dirty electricity meter.

After I make some money, I will definitely look into appropriate antennas for RF explorer.
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

Merializer
In reply to this post by black-sun
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

Merializer
In reply to this post by black-sun
Here are some videos with the new Esmog Spion 5G:
https://vimeo.com/user127183542
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

Karl
In reply to this post by black-sun
black-sun wrote
I want to know whether there is a way to measure electromagnetic radiation between 1khz and 30mhz with reasonable accuracy without spending a fortune.

...

If that's not possible at a reasonable price, I want it to be at least 200khz.
Probably. For example this detector should work from 100 KHz to 500 Mhz, and detect signals as weak as -75 dBm with +/- 1 dBm accuracy:

https://www.ebay.com/itm/AD8307-0-1-600M-RF-Logarithmic-Detector-75-15-dbm-Measuring-Power-Meter/143683912576

(I think the 600 MHz upper limit is a typo, and the 100 KHz lower limit probably has to do with the design of the board.)

It's based on this chip, which is from a reputable manufacturer and is supposed to work at frequencies below 1 KHz:

https://www.analog.com/en/products/ad8307.html#product-overview

You would still need different antennae for different frequency ranges.
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

Karl
In reply to this post by black-sun
I just ordered a similar board based on the AD8318 chip from Analog Devices, which is supposed to work from 1 Mhz to 8 GHz:

https://www.ebay.com/itm/AD8318-RF-Logarithmic-Detector-RSSI-Measurement-Power-Meter-1-8000MHz-70dB/333845892085 (There are cheaper sellers.)

Another option would be a board like this, which should work from 100 KHz to 2.5 GHz and be sensitive down to about -60 dBm:

https://www.ebay.com/itm/1PC-AD8313-RF-Power-Moudle-Meter-Logarithmic-Detector-Power-Detection-Broad-bn1/124390398267
Reply | Threaded
Open this post in threaded view
|

Re: Is there any way to measure electromagnetic radiation between 1khz and 30mhz?

black-sun
I can't utilize your recommendations because I don't know how to use them.

I have Safe and Sound Classic, Sony ICF-P26 AM Radio, and ME3830B for EMF measurements.
12