EVP’s: Where do they come from? And how can we try to find out?

Here is one way……


EVP’s are very interesting phenomena that have been documented since the 1920’s when Thomas Edison was tinkering in his lab. They have been recorded on analog and digital mediums with equal success. There are many interesting questions and hypotheses on this topic.

In the field of paranormal research EVP’s have been documented by almost every investigator and are considered one of the most documented phenomena’s. Whether ghosts or spirits are behind these recordings is speculative at best, we simply do not know what causes this phenomenon, just that it happens.

So let me start by asking a few questions that most people don’t think about. First….what are the physical means that take place to cause the EVP’s to be embedded on or in the medium? It happens on digital and analog mediums, with dynamic microphones, electret microphones, condenser microphones and cardioid microphones. Exactly what is happening here? Perhaps mechanical noise from the tape heads, or maybe digital noise created by digital audio CODECS. Are the EVP’s sound waves, radio waves, microwaves, or some other unknown energy? At this point, we simply don’t know.

The second question is what do we know? Well, we do know that sometimes EVP’s are electromagnetic in nature. Experiments going back to the early 1970’s show that sometimes EVP’s are recorded in a vacuum chamber, which eliminates the possibility of it being sound waves since sound waves need air to propagate through the environment. One thing about this finding that always bothered me is why did the experimentation stop there? If the results of the experiments showed that the recordings were electromagnetic, why not try to identify wavelengths and frequencies? To me, this would have been the natural progression of the experiments. Perhaps it was simply that the technology needed to isolate a particular frequency was too expensive, or was just not available at the time.

The third and final question is what conditions are required (if any) to document an EVP? Are there environmental factors involved, emotional factors, or are they simply random events that require no conditions at all.

When I think about EVP’s these are the things I think about, I would love for these events to be truly paranormal, but at this point I am not willing to go out on a limb and say that they are, But I will say that the origins are at this time are unknown, that I can say with 100% certainty.

So let’s start with what we do know.

One of the things I have been working on directly deals with the notion that EVP’s are electromagnetic, and efforts are being made by me as well as others to identify and isolate EVP frequencies so that possible communications can be made using those identified frequencies. But there are a lot of roadblocks that have to be worked around. First you have to account for the thousands of man made frequencies that are bombarding the planet every second of every day in the forms of wireless communications which include, satellite communications, Military communications, short-wave communications, wireless radio and television signals, Wi-Fi, CB radio, HAM radio, cordless telephones, Cell Phones, and the list goes on and on. So to solve this first hurdle you have to be able to identify and exclude all man made frequencies, I use a frequency allocation chart from the F.C.C. and then look for any unknown signals that remain.


Then you have to correlate that signal spike with an EVP, not once but multiple times. And who is to say that if you are able to do this that the frequencies that you correlate with an EVP aren’t as random as the EVP’s are.

So back to the first road block, how do you account for the thousands of man made communication frequencies? Well, you use a real-time frequency analyzer. This will display all communication frequencies that are within range of your voice recorder. Most of the modern wireless communications are in the SHF (super high frequency) 3-30 GHz, and EHF (extremely high frequencies) 30-300 GHz. Since these technologies didn’t exist in the 1970’s I will focus my attention on the frequencies that were used in that time period, 30 Hz- 3000 MHz as follows.


  • 225–420 MHz: Government use, including meteorology, military aviation, and federal two-way use
  • 420–450 MHz: Government radiolocation and amateur radio (70 cm band)
  • 433 MHz: Short range consumer devices including automotive, alarm systems, home automation, temperature sensors
  • 450–470 MHz: UHF business band, General Mobile Radio Service, and Family Radio Service 2-way “walkie-talkies”, public safety
  • 470–512 MHz: Low-band TV channels 14–20 (also shared for land mobile 2-way radio use in some areas)
  • 512–698 MHz: Medium-band TV channels 21–51 (Channel 37 used for radio astronomy)
  • 698–806 MHz: Was auctioned in March 2008; bidders got full use after the transition to digital TV was completed on June 12, 2009 (formerly high-band UHF TV channels 52–69)
  • 806–824 MHz: Public safety and commercial 2-way (formerly TV channels 70–72)
  • 824–851 MHz: Cellular A & B franchises, terminal (mobile phone) (formerly TV channels 73–77)
  • 851–869 MHz: Public safety and commercial 2-way (formerly TV channels 77–80)
  • 869–896 MHz: Cellular A & B franchises, base station (formerly TV channels 80–83)
  • 902–928 MHz: ISM band, amateur radio (33 cm band), cordless phones and stereo, radio-frequency identification, data links
  • 929–930 MHz: Pagers
  • 931–932 MHz: Pagers
  • 935–941 MHz: Commercial 2-way radio
  • 941–960 MHz: Mixed studio-transmitter links, SCADA, other.
  • 960–1215 MHz: Aeronautical radio-navigation
  • 1240–1300 MHz: Amateur radio (23 cm band)
  • 1452–1492 MHz: Military use (therefore not available for Digital Audio Broadcasting, unlike Canada/Europe)
  • 1575 MHz: GNSS L1 band—GPS, GLONASS, Galileo
  • 1710–1755 MHz: AWS mobile phone uplink (UL) operating band
  • 1850–1910 MHz: PCS mobile phone—order is A, D, B, E, F, C blocks. A, B, C = 15 MHz; D, E, F = 5 MHz
  • 1920–1930 MHz: DECT cordless telephone
  • 1930–1990 MHz: PCS base stations—order is A, D, B, E, F, C blocks. A, B, C = 15 MHz; D, E, F = 5 MHz
  • 2110–2155 MHz: AWS mobile phone downlink (DL) operating band
  • 2300–2310 MHz: Amateur radio (13 cm band, lower segment)
  • 2310–2360 MHz: Satellite radio (Sirius and XM)
  • 2390–2450 MHz: Amateur radio (13 cm band, upper segment)
  • 2400–2483.5 MHz: ISM, IEEE 802.11, 802.11b, 802.11g, 802.11n wireless LAN, IEEE 802.15.4-2006, Bluetooth, radio-controlled aircraft, microwave ovens

When looking at this list it seems like a lot of frequency ranges to go through and keep tabs on, but I can tell you there are thousands more that are not within these ranges.

Now that I have a range of frequencies I want to work within and I know the sources of these frequencies, how do I remove them from the equation? And how do I correlate a spike with an EVP?

First, you need an audio recorder and an input device that is sensitive to EMF, a telephone pickup works great for this,


And it will not record sound of any kind, you will need a frequency analyzer set to respond to the frequency range that you are working within.

 Finally, you will need to put these devices in an RF shielded box;

 This will filter out the EMF from manmade sources. Press record on your recorder and proceed with your EVP sessions, at the same time use screen capture software to record the data from the spectrum analyzer, if you record an EVP on the pickup coil, you should see a correlating spike on the spectrum analyzer, document that frequency and do further testing until you have enough data to determine whether the EVP’s are indeed from one frequency source, or if they are totally random. If they are the same frequency then you may be onto something. You can then broadcast questions on that frequency and if we are lucky, we will make contact with the paranormal and will be well on our way to a Nobel Prize. If they are random we will have to go back and re-think the hypothesis that we are working from.

If you would like to see a complete video of the hardware and software used in this experiment, you can see it here.  (   https://www.youtube.com/watch?v=EitpTUM7t_g    )


Hardware and software used in this experiment

RF Explorer Scanner- http://rfexplorer.com/
Touchstone Pro (paid software) http://rfexplorer.com/downloads/
Free RF Scaner Software ( From RF Explorer Developer) http://rfexplorer.com/downloads/

Telephone pickup- https://www.amazon.com/Telephone-Microphone-Suction-Cup-Pickup/dp/B0034I75IK/ref=sr_1_1?ie=UTF8&qid=1502643584&sr=8-1&keywords=telephone+pickup


Radio Frequency/ EVP correlation experiment

Radio Frequency/ EVP correlation experiment: Devise a reliable, repeatable test to determine if EVP’s are sometimes caused by electromagnetic radio transmissions.



  1. The hypothesis is that EVP’s captured in a vacuum using a dynamic microphone are sometimes the result of RF emf.

This is an experiment to identify EFM frequencies that correlate with EVP’s


Experiment: Overall plan – To test whether EVP’s in can be caused by electromagnetic RF transmissions.


Experiment Elements:

1) Voice recorder with telephone pickup, or dynamic microphone.


2) RF shielded container or cage to eliminate known man-made RF frequencies.


3) Real-time RF scanner to identify any electromagnetic transmissions.


4) Software to interoperate data coming from RF scanner, and screen capture software to record scanner activity.


5) Video editing software to combine audio and video files.


Safeguards and Considerations

  1. Screen captures and audio files will be synchronized to identify EVP’s and EMF transmissions.
  2. All tests must be conducted with the same testing devices.
  3. All tests must be conducted in the same manner.
  4. Tests must not be conducted in extreme heat, cold, rain or high humidity.
  5. RF/EMF/EVP’s that are collected that are not words will be considered digital noise, as you would need a decoder on the receiving end of a digital signal. So analog UHF signals are of interest here, especially since the first experiments were conducted in the early 1970’s when digital technology wasn’t available.
  6. A sweep of the testing site will be done to identify any RF signals broadcast in the area, all will be noted and removed if possible.


Possible Measures of Success


  1. Obtaining data that supports the hypothesis that EVP’s that are captured with dynamic microphones are sometimes the result of RF (UHF) transmissions.


  1. Obtaining data that supports the hypothesis that dynamic microphones record EVP’s that are not caused by RF (UHF) transmissions.


  1. Obtaining data that shows these experiments can be repeated and conducted by anyone in a controlled environment.



Equipment Settings


RF scanner will be set to simultaneously scan the entire RF spectrum to detect radio, microwave, WiFi network transmissions, cell phones, CB radio, walkie talkie, baby monitors, wireless video, wireless audio, wireless surveillance systems…..in other words, all man-made RF transmissions within the UHF ranges.


Secure a location with no reported paranormal activity for the first round of testing, then a second reportedly haunted location for the next round of testing,



Equipment/Experiment/Researcher Locations


Narrative: The experiment part 1 Was conducted on __________________

At ______________

The experiment Part 2 Was conducted on_______________________ At_______________

The experiment was conducted by:







Analysis-Baseline: Tests were conducted to note the most common and strongest sources of RF transmissions at the location of the experiments.



Analysis -Test 1:


Analysis-Test 2


Analysis: Test 1 Vs Test 2




Lessons Learned

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