First let me start by saying that using any type of technology and testing it out, and seeing if you can get results like this is a good idea. The SDR concept itself seems pretty interesting and something I would play around with. However...
There are major concerns I would have if I was leading an investigation and this was used as evidence.
Any "EVP's recorded on a ghost box are not technically evp's because the ghost box is just blurting out random radio signals that are words and such. So there is an explanation for the source of a noise and thus can be debunked as coincidental noise even if it sounds like your chosen key word.
Since you can't get an EVP certainly not a Class A EVP, you are left with more speculation than actual evidence from a ghost box. Also any room you are using that in, or any nearby room is contaminated from the noise of the ghost box for audio recording.
I still think it is FAR better to use other techniques to record paranormal phenomena such as digital audio recorders, cameras, thermal cams (very costly but produce the best results), and full spectrum cameras (also costly but very effective). Also MEL Meters and K2's are better devices in my opinion for interacting with paranormal activity.
I don't think Ghost boxes are useless, they just have no place in a proper investigation from my standpoint as someone who has lead investigations before. In example I was the lead investigator for the first and only ever investigation of High field Hall in Falmouth MA and many private residences as well.
Like let's say we captured exactly what you did for evidence in that video above, the "Kitty Cat" and "Nantucket" words, unfortunately that is not hard evidence of paranormal activity and therefore if that is all we found it would not be enough to say a place is haunted not even close. So, I think investigators would be better served to spend their money on digital recorders, cameras, and if they want to stir up activity the best way to do that is to build and EMF field generator which raises the available EMF for paranormal activity to draw from to perform activity.
Good post though, gave you my 100% upvote. Peace.
Maybe it isn't ghosts we're dealing with when it comes to the ghost box radios. EVPs I would believe by default to come from spirits. But since ghost boxes are technology, I don't know, I for some reason feel like the mind of the user can affect what comes out of the radio.
But it does work. Whatever it is. It's not about capturing EVPs, it's about giving the spirits (or whatever it is) a loud conduit to use as their voice. They have to tap into universal randomness in order to do it.
Hard to describe, but it's like retropsychokinesis (RPK), where you can affect the outcome of numbers coming out of a random number generator, retroactively. In effect slightly changing the past to produce desired results in the present. Randomness is the soup of the universe, and when you're skipping through a bunch of radio stations the audio (feedback) is truly random data from which "it" "they" or "us" can pluck responses, since it, they, or us has retroactively influenced which random data will be where and when.
I'm pretty sure you could have a ghost box repeat words at you all day long. This in itself is interesting phenomena that gardens further study, but indeed it might not be the right tool for ghost hunting, who knows.
Yeah, I hear what you are saying. It might be possible that it has something to do with human consciousness messing with the radio, it is notable that the human brain is a giant EMF device basically, so maybe it can affect electric devices external of the body via electro magnetics. You could be on to a whole new scientific study of how the mind can affect devices via the consciousness. Interesting stuff I need to smoke a blunt before having a thought experiment on.
Intelligent paranormal activity and demonic activity both which I can assure you from my personal experience are very real. Normally can communicate via EVP, and the best EVP's are when the researchers hear it and it shows up on the audio and requires no audio manipulation to understand the words. These are Class A evp's and those are the best evidence for the existence of ghosts being intelligent and dead human beings and or demonic entities because of the nature of the words being recorded.