Build A RF Field Strength Meter

[@markjohnmears]

Very well done - I was able to finally get this working but would add that an important aspect of the Sketch is to look for a low signal over a window of time since the low voltage can be short duration. Although I can get responses from RC RF devices, I get no response to my cell phone like you show.

[@PhG1961]

You made my day ! Exactely what I need. Awesome. Continue your good work.

[@bobvincent5921]

Thanks for the clear description and a useful and adaptable setup.

[@invisableobserver]

Jack Kilby would be impressed with your work since you are using the technology he invented.

[@0033mer]

We share the same birthday .... Nov 8

[@invisableobserver]

@@0033mer wow, he died on my birthday 6/20. My mother worked with him at Texas instruments in the early 60's. Have you done more work on your EMF meter? I need one but can't afford one is why I checked out your video, I am electromagnetic hypersensitive.

[@0033mer]

This one is simpler. kzbin.info/www/bejne/jZKpc4ikmtVqipI

[@ralfschooneveld3186]

Do you build these for people? I need a custom meter higher than 8Ghz. Radar sensors. Dont know electronics or coding. What is the sampling rate per second on this thing of yours?

[@felipemiranda8743]

Nice work, dude! I have one question: iis there a way to get the readings of a specific bandwidth? E.g., I what to get the RSSI of just 433 MHz signals.

[@usairummirza9617]

Can you share schematic for this i am looking there are 2 slots one is vout connected to a0 of audrino and dont know if you ground the other or short both of em

[@markjohnmears]

I had the same question. I did a continuity check to find that the supply ground is connected to the outer "OUT" labeled line. That is the one with the square pad is ground and the one with the circular pad is the signal.

[@timothius9000]

having watched your other vid on a using a discreet wheatstone bridge for the same job, i'd love to know which one is the most sensitive?

[@0033mer]

Generally they are about the same. The wheatstone bridge will degrade a bit as the frequency increases as it does not have the bandwidth as the RF amplifier version. When you are in close proximity to the transmitter the performace is basically the same.

[@Hawktok]

Can i use a 433 mhz receiver with rssi outout pin instead of rf module to determine incoming strength of a signal beaconb

[@0033mer]

Yes, but it will be restricted to 433 MHz signals only.

[@Magpie_Ian]

Hi champ, love your work! Could this be used to compare antennas? Cheers!

[@0033mer]

Yes ..You can measure the field strength of two transmitting antennas under the same conditions for comparison. The RF amplifier is broadband so ensure no other transmitters are in the area while testing. For more accurate results use a voltmeter to measure the DC voltage output of the amplifier. There is a voltage vs signal strength chart that can be used to obtain the results. The chart can be seen in this video: kzbin.info/www/bejne/fIfEmoqwf7iphLc

[@matty1195]

Are you able to Target it in on specific frequencies and ignore others. say for instance a field strength meter for the P25 RF network... I would be happy to pay you to make a prototype so I'm really looking forward to your response

[@0033mer]

The easiest solution would be a handheld spectrum analyzer or software defined radio (SDR) rfexplorer.com/

[@acqurius-gx8lr]

what is the minimum signal that is detectable by AD310.Also does Vcc disturbe output voltage of AD8310?

[@dennisk.5829]

Hi I would like to use the AD8318 module to detect the RSSI from cell phone tower. I do have a dual band 800/1800MHz antenna. Is there any way to know which frequency is being monitored? I also have a 2.4MHz antenna for testing purposes using spectrum analyser

[@0033mer]

Look into SDR (Software Defined Radios) This would be the easiest solution. airspy.com/

[@xendrone0083]

This help me a lot, but I would like to know the wires material used in this piece of work especially the ones that you used for connecting the meter to your computer.

[@xendrone0083]

Pls it for my project

[@0033mer]

It's 24 AWG solid copper wire.

[@xendrone0083]

@@0033mer Thank you very much :)

[@xendrone0083]

Sorry to bother you again but can you please do a list of all of your materials required for the meter. Thank you in advance.

[@xendrone0083]

The 24 AWG solid copper wire is used in the circuit but what is the item use to connect at the rf meter module?

[@mohanbabu009]

Isthere any another version of AD8313 IC

[@liadelbaz7743]

how the is the rf power represented in the arduino like what is the decimal value you get from the rf sensor dependent on the rf signal?

[@0033mer]

The rf power to voltage output is covered in the video at 3:27. To see the power to voltage graph check our this video: kzbin.info/www/bejne/fIfEmoqwf7iphLc

[@lasersbee]

6:00.. Wondering if you could monitor the input by the output of the RF chip using the Arduino to disable the power to the RF Detector Chip if the detected signal is too high for the chip (5W) ?

[@0033mer]

For high power monitoring I use a feed through attenuator. It just screws on to the SMA connector on the detector module. www.banggood.com/2W-SMA-JK-Male-to-Female-RF-Coaxial-Attenuator-6GHz-50ohm-20dB-Connectors-p-1079176.html?rmmds=search&cur_warehouse=CN

[@DungPham-dg3ew]

Hi! Very helpful video. Could you please help me translate your code in forth into C?

[@hrijithk7623]

Sir can you give the components details and proper circuit diagram of this RF field meter.

[@abbasqavami7777]

what is the antenna part number ?

[@Francois_Dupont]

adding a ground wire wrapped around you hand would help greatly with the sensibility.

[@0033mer]

A "tiger tail" ground was added by connecting the antenna ground to a couple of lengths of vero strip line.

[@Francois_Dupont]

@@0033mer ahhh ok ok. i am not a HAM, but i think the proper name is a "counterpoise".

[@0033mer]

Technically you are correct, but I think more people would identify with "tiger tail" kzbin.info/www/bejne/fYaxoGZ_jaejaNE

[@alibehrouz9833]

how many years are you in electronics? you are professional

[@0033mer]

My interest in electronics started when I was a kid by building crystal radios and taking apart TVs and other electronic devices. My school time and working career spans over 40 years.

[@alibehrouz9833]

I learned many useful points from you and your experience thanks @@0033mer

[@0033mer]

That's the reason why I started my KZbin channel and involved with kids at our local Maker club. Just want to pay it forward. Glad you find the videos useful.

[@alibehrouz9833]

of course Everyday, when I Leave work, I have a motive to see your videos. Your channel is the best cinema in the world! Even better than hollywood!@@0033mer many thanks

[@boonedockjourneyman7979]

So ... is the Arduino fast enough to resolve power v time? I wonder what that would show?

[@Braz1956]

Nice video. Are you also a HAM operator or mainly interested in LM?

[@0033mer]

Not a Ham but have donated and built many of our local Ham repeaters.

[@richardbalboa7161]

Is it possible to make it detect the strength of a specific frequency signal?

[@0033mer]

For precision measurements you should get a spectrum analyzer. To measure a frequency band you could build a front end helical bandpass filter tuned to the frequency of interest. kzbin.info/www/bejne/oHOxlIekbqd4r5I

[@richardbalboa7161]

@@0033mer Thank you engineer! :)

[@alvinfreeman8838]

I added my RF detector module output to the analog input of arduino but it detects DC background of output instad of AC signal so I add a capacitor but you didn't use it. Also arduino continuously detects 60Hz noise from near electronic devices.

[@0033mer]

The output of the RF detector is DC, from .5vdc to 1.65vdc. The capacitor you added on the ADC pin will make it floating so it could pick up stray AC.

[@sidharthap]

Could you please share the part numbers / links of those bright white LEDs?

[@0033mer]

The part number for the LEDs is DE2557 It is available here: www.dipmicro.com/store/LED3W

[@frankjuniorvarasurco5434]

What is the integrated code used by the detector?

[@jhonsqueaks4573]

Hi Is It Possible To Read The Incoming Data?.

[@0033mer]

Simple modulation like OOK but any other modulation you would need a proper discriminator circuit.

[@mindaugasvaskevicius1818]

Correct me if I'm wrong, but Arduino could be replaced by LM3914 in this case....

[@0033mer]

Yes .. that would be a good choice as a no code solution and you get 10 output LEDS. I have used the LM3914 in this type of application. Texas Instruments has announced End of Life on the DIP package so it will soon be obsolete. The current price on old stock is the same as a Nano online. I like the ability to set the threshold levels in software and I have multiple profiles for different radio applications stored in flash. If you have any LM3914s on hand you can use it to replace the Nano.

[@acqurius-gx8lr]

can we connect speaker to it and vary the sound loudness to show strength of the signal

[@0033mer]

A simple voltage controlled oscillator driving a speaker will vary the frequency or "beep" rate with signal strength increase.

[@acqurius-gx8lr]

can I connect output of RF board to 555 oscillator circuit?will it drive oscillator circuit.i want to create constant frequency but variable amplitude to show strength.i do not want change in frequency.

[@0033mer]

When the Nano reads the output voltage it can then control a X9C103 (digital volume control ) to control the amplitude of the oscillator. kzbin.info/www/bejne/mWnIha2fnNV9q5o

[@acqurius-gx8lr]

yes you are right but in that case there will be audio step change in sound loudness will be observe that will creat bad impact of design.

[@manipulativer]

Yo. Why are not we using power and thus information transmission through Earth as Nikola Tesla devised it? Like his wardencliffe tower might look like aether pulsed propagation but in fact is just an air capacitor for the current to do its work from Earth. He also explains that you can automodulate the signal so you can transmit voice with no microphones or speakers and so on

[@UndernetSystems]

This would be fairly nice for Amateur radio transcievers ;)

[@vidasvv]

TNX 4 sharing ! 73 N8AUM

[@carajux1]

what is the code to program it, I really need it for a project in my university, I hope your answer thanks.

[@0033mer]

Code starts at 4:15

[@carajux1]

and the code for the arduino sketch?,sorry to bother.

[@0033mer]

I use the Forth programming language for all my code and do not use the Arduino IDE so there is no sketch. Forth is faster and more efficient. To program a sketch, take the ADC reading and turn on more LEDs as the value increases. Another option is to use a LM3914 bar display in place of the Nano.

[@carajux1]

In my country do not sell the rf module to 900Mhz, how would you do to create one? the problem is that I need it for wednesday

[@0033mer]

Check online for an analog FSM circuit that you can build. www.qsl.net/va3iul/Homebrew_RF_Circuit_Design_Ideas/Homebrew_RF_Circuit_Design_Ideas.htm

[@vetrivel1740]

What is the range that it can pick up signals

[@0033mer]

That depends on the output power of the transmitter you are trying to monitor.

[@ovalwingnut]

Yes! Yes! Yes! (sadly something I never hear from my GF)... Followed a link from another of your videos to this one. Exactly WATT I was looking for. I am very pleased 🤓 👈 this is proof. Cheers.

[@0033mer]

Check out this video for even a simpler RF field strength meter. kzbin.info/www/bejne/jZKpc4ikmtVqipI

[@germanjohn5626]

Why go through all this trouble of using a micro processor for a simple task, something a 1 buck analog circuit can do a lot better with less RF interference? Not everything in the world needs a micro processor.

[@0033mer]

Take your pick. kzbin.info/www/bejne/jZKpc4ikmtVqipI