Monday, December 14, 2020
Uku Lelea și semaforul.
Deci. M-am dus să-mi iau frumusețea de camionetă din 98 din parcarea de lângă stradă, la 5-10 minute de mers de aici. Resetasem ieri computerul (poți să-l resetezi prin deconectarea bateriei, ștergerea codurilor de eroare cu ajutorul unui conector blue tooth de vreo 3 dolari și o aplicație gratuită, Torque Lite (pe care am plătit-o odată, dar am resetat tableta și nu mai merge), cu care poți citi și senzorii, etc.). Am vrut să-l resetez azi din nou dar am uitat și l-am pornit.
Ce se întâmplă. De câte ori resetezi computerul la mașinile mai noi de 96, motorul iese din funcționarea pe buclă închisă (closed loop, optimizat) și intră într-un mod generic (open loop) și începe să facă niște teste de senzori perioadă în care nu scoate coduri de eroare. Dacă trec toate testele, intră pe closed loop și începe învățarea stilului de conducere pentru a optimiza consumul și emisiile.
Rezistența de încălzire de la al doilea senzor de oxigen (ăla de după catalizator, cu 5 fire). Se rezolvă cu o pornire la rece (temperatura lichidului de răcire să fie cam aceeași cu cea a aerului și mai mare de 4 grade Celsius, deci după o noapte, dar se prea poate iarna. Adică se poate dacă prinzi o dimineață peste 4 grade sau 40 Farenheit). Al meu l-am schimbat aiurea acum doi ani fiindcă nu știam chestia. Dacă trece, face și testul senzorului însuși în vreo câteva minute de mers sub 40 la oră combinat cu ralanti. Apoi supapa de recirculare eșapament EGR (pentru răcirea amestecului, se recirculeaza o mică parte din gaze de eșapament în galeria de emisie, care micșorează temperatura și practic crește cifra octanică printr-o supapă comandată de computer, a nu se confunda cu supapa de recirculare pentru aerisire, PCV). Și aceea era schimbată, dar a fost într-adevăr defectă. Pentru aia trebuie să mergi vreo 5 minute peste 90 la oră cu viteză constantă. Deci trecusem toate testele și m-am dus la stația de testare care era închisă. Luni, uitasem.
Am emoții fiindcă dacă nu trece, trebuie să schimb iar catalizatorul pe care l-am schimbat deja de 3 ori, fiindcă tot așa nu am știut chestia și am pus catalizatoare ieftine, care nu au cantitatea de ceramică necesară și se duc după vreun an (un catalizator bun nu are cum să fie sub vreo 500 de dolari și de obicei trebuie să iei unul original). Dar cum s-a stricat și ăla. Într-un an pe 3 iulie (2010) am mers undeva și când am venit acasă pe drum mașina a început să facă un zgomot foarte nașpa, ca de pietre care se rostogolesc, de fapt se spărsese blocul de ceramică din catalizator, care e o chestie rară. Chevrolet S10 este un tip de Chevrolet făcut de GM în colaborare cu Isuzu care au și ei unul identic care se numește Isuzu Hombre.
M-am întors și am intrat puțin în parc. Adică pe strada de pe lângă, cum merg eu mai recent, din cauza prafului de piatră de pe alei unde au turnat pietriș care se macină și se face praf foarte nașpa. Am mers eu vreo 10 minute și am dat de un nor de fum. Foarte subtil, fin, cum zice Angela. Cel mai probabil cocaină, care seamănă mult cu fumul de vegetație. De fapt, e tot o plantă și aia. Mă gândeam iar, cum m-am mai gândit, dacă nu cumva Gingis Han nu a folosit asta ca pe o tactică de luptă. Adică iei niște provizii de ceva plante de care lumea în Europa nu a auzit și niște meseriași care știu cum bate vântul, trimiți doi din ăia care fac unul două focuri din direcția vântului lângă tabăra sau satul pe care vrei să-l iei. Oamenii din tabără sau sat simt puțin miros de fum, dar nu știu ce e și într-o oră două devin happy, încep să facă tot felul de chestii, după care vii și-i iei cu pierderi minime. Astfel a luat el Asia și o parte din Europă, pe care însă nu a putut s-o țină, fiindcă habar nu avea de cultura și mai ales religia locală.
Nu mult fum, dar m-am întors. Eram puțin happy dar nu prea. La ieșirea din parcare prima fază. Se bagă o tipă în față (aici sunt foarte puțin pietoni) să treacă pe trecere.
Dar în intersecția următoare și singura până acasă, la 7-11. Se face verde, pornesc încet și semnalizez stânga, vine un tip din parcarea din față de la 7-11 spre mine, îl las să treacă înaintea lui pe lângă mine (aveam semn să cedez dacă fac la stânga), mai iese unul și face la dreapta, îl las să treacă și pe acela, fac stânga și în ultimele secunde de verde apare și un pieton întârziat care trece strada de la stânga, pe care nu-l văzusem din cauza celorlalte două faze, la care frânez. Un tip roșcat cu barbă destul de lungă. Vin acasă, încerc să mă relaxez, pun un video, îl văd pe tip, singura diferență e că avea barba mai lungă decât în video. Și apropo e prima dată când mi-am dat seama că tipul are barbă roșie fază la care îmi vin în minte versurile "woke up to a red parade and refused to make amends".
Wednesday, December 9, 2020
5G
Mostly concerned with my own physical safety over privacy and other issues, i started to search and write on the subject. But before that i have to put down with some stipulations. In my opinion, formed after many years of being in the middle of a story that clearly involves agents of the Empire of Japan controlling many aspects of my life, i came to the conclusion that China has been fully taken over secretly by Japan, many years ago, under the camouflage of a communist dictatorship and nowadays is used as forced labor base for massive exports of electronics products in the US with the purpose of de-technologizing, de-educating, downgrading, and generally annihilating the work force and ultimately entire population of the US. If tomorrow China would stop exporting electronic goods to the US, US will be paralyzed because they don't have the capacity and readiness to take over this production that has already passed several levels ahead of anything produced in the US in the past, with the exception of Intel maybe.
After stumbling yesterday upon the existing standards for protection from levels of emissions of the "older" technology (1.6 watts/kg), that were probably adopted just to fit the technology and products, not to protect anything, without any scientific backing or studies, they are "just" starting to study the long term effects of "low level" microwave exposure, low meaning it does not instantly boil you, most of the studies searchable on the internet are dated after the "adoption" of the standards, which also proves many other people have second thoughts, and contemplating the enormity of the "allowance", of which many probably don't understand, what else can be said?
One typical, way too circulated American phrase: If you think that is bad, wait until 5G comes. (If you don't, do the same. It doesn't matter).
The main novelty brought by 5G is the way signal is transmitted to the tower (and back but that is not that interesting because of dispersion and distance). Ironically, with the purpose to save power, the emission is made directional and confined to a narrow beam which then can be much stronger (denser).
How narrow, about the size of the antenna itself. This way, the power density can be increased to levels allowing much higher speeds (for higher speeds you need more power to beat the noise which becomes important at higher frequencies modulation). Yes, you read right. With the same 3 watts or whatever, (power is limited due to probably using the same batteries), you emit a narrow beam instead of a spherical wave.
This way you eliminate waste of energy (most of the signal up to 4G goes to nowhere usable) the intensity of the signal can be hundreds of times higher using the same power.
That's what i thought myself for a few seconds or so. But then, you hold your phone in your hand, right, the beam would go right through it? From what i read so far, the beam would follow the tower even if you moved around, actually it wouldn't make sense if it wouldn't, and phased array is the technology used in radars that can scan the area in front of the antenna many times a second, and the phone's inertial and gravimetric sensors together with GPS know its own position so it's perfectly doable, actually already done (though looking weird to me). So what happens when you turn around while pacing and speaking into your office and the tower moves on the other side of your head? Let's say they were conscious enough to embed in the design a function that would allow switching to another tower that is again facing the back side of your phone. But that other tower would be on the other side of the building, right, and the beam won't go through.
I wouldn't dare to say what others did, what would happen when you have a conference meeting with each member having his own beam following each its own tower (carrier)?
Here the technical details i've been trying to delay. How a phased array antenna inside your phone looks like and especially where it's located. (3 in this image).
How are they going to comply with the already immense limits, if the power would be the same 3 watts max but the beam would concentrate all that power in a few square inches?
And ultimately, why do we need all that, just to watch 4k movies on our phones when going in the park?
Here's a really smart one. (It's tough indeed to get radio signals going through metal, duh!)
"no one had demonstrated that it’s possible to build these antennas into phones with full metallic casings, as can be found in the high-end mobile devices from numerous manufacturers [didn't know numerous manufacturers have already manufactured numerous high and/or low end 5G mobile de-vices]. Now researchers from the Shanghai Institute for Advanced Communication and Data Science at Shanghai University in China have developed a 28 Gigahertz (GHz) beam-steering antenna array that can be integrated into the metallic casing of 5G mobile phones."
The trick is, the signal doesn't really go "through" the metal casing, it takes a detour through the glass first. Then it reflects and/or difracts on your head and provided the system is smart enough, will focus onto the tower and adjust strength, by trial and error, taking into account (or maybe not) your head's conductivity. If you don't believe me, take one of these, find where the tower is and keep it away from your head and tower and tell me if you have any signal (nevermind, would probably still have diffraction on the edge of the case and some signal, maybe 25% would go through). Which brings me, this time to a rhetoric question, how the signal goes through "the metal casing" of the "high end" phones for the classic, 4G ones? (unless if the casing itself is the antenna). Nevermind, curiosity got the best of me. And after reading that, here's a good idea for the "high end" users. Better hold your phone with the metal case to your ear!
Monday, December 7, 2020
Android and Masseter Muscle
Today i started to re-consider the idea that the problem behind my inflammation of the parotid glands but also... masseter muscle or even prostate, sciatic nerves, may be the phone.
I got a phone from Boost Mobile, for 80 bucks, but i only used it with Boost a couple of months and now i'm using it on wi-fi only (when available). I always assumed wi-fi, which uses the same frequencies as cell phones, cordless and microwave ovens, would use less power, because of limited distance.
After months or maybe years of inflammation in that area (including tip of the ears painful, like after being outside in cold, other symptoms, like loss of balance) it occured to me several times it could be the phone but i forgot every time.
I once had a microwave leak detector identical with the one in the picture below. I took it apart and i saw inside there was only a GHz range diode and a magnetoelectric type of meter. If i kept it inches away in front of the microwave, the needle would move and if very close, the needle would go on red. But the leaks are way bigger if there is nothing to heat up in the microwave, like if you start it empty though that never happens in practice. In this case needle would go over the range even inches away and still move at one meter distance.
I broke that leak detector and threw it away and years after i wanted one and could not find it anymore and i bought instead a diode like the one inside the old one for 2 bucks somewhere, maybe at Fry's and used an old analog meter, which i stripped of electronics and i put the diode and a piece of wire figuring a dipole in series with the meter and it shows similar readings near the microwave (shown in the videos at the end).
When i tried that one close to the phone i saw the needle would move in similar ways with the first one when close to the microwave oven. It makes sense since microwave ovens work at 2.4 GHz, close to cell phone frequency (i think 5G doubles that).
I tried the same with Angela's and it doesn't move the needle though she pays for voice and data and mine works only on wi-fi. I tried it near the wi-fi router and the needle moves as well over there.
A new 700 watts 2.4 Ghz microwave oven may leak 1% of the whole power and that is also the maximum amount the phone can put out when talking to a distant tower. 99% of the time when used in town the phone uses only a fraction of that power, it goes to maximum only occasionally.
Cordless phones use similar or lower frequencies and slightly less power. But who can guarantee the manufacturers, trying to "improve" the quality of the signal, won't use more?
Microwave leaks at ovens happens only close to them where you don't usually stand with your head and will decrease to 0 at one meter distance if you have something to heat in the oven.
Is it acceptable to have about the same level from a phone that stays close to your skin and other organs? Is 1-2% of the full power of a microwave oven for one hour a day too much for your head? I believe anything above 0 is too much already.
Before the Moto e6 i own now and other previous Android phones we had a couple of small blackberry imitation phones with cameras that weren't smart phones. I was also talking a lot on cordless maybe hours a day during those days. I gave up cordless phones in 2015 when i stopped using a landline.
It was around that time when i started to have symptoms like loss of balance, which were most likely caused by increased intracranial pressure due to infections in the area close to where you hold your phone, that were propagating to the meninges and spine. One prolonged course of antibiotics of several months and discovery of diabetes in 2015. I think diabetes occurs when infection from salivary glands inflamed from your phones (cell and cordless) propagates to the pancreas that has some similarities with parotid glands (at least a few similar cell types for production of amylase).
Nowadays, besides the bulges on both sides in the area with masseter muscle and parotid glands, i lost much of the facial hair in that area (sideburns), have pain at the ears, dizziness, weird punctual headaches, after eating or in the morning, etc..
All i have to do now is not put that phone to the ears or near my body when it's on and wait and see.
One more thing. I think i exposed myself to a good dose (since i'm sensitive already) when i filmed this video because if you start the mwave with nothing in it it will leak much more.
I had no idea until one minute ago that they have "regulated" levels of leaks for microwave ovens which proves that my concern is real. Google even mentions the levels considered safe. At first glance they look insignificant. 5 mW per square centimeter. FDA, an American agency, this time gives it per square centimeter. Because per square inch that value would be... about 6.4 times greater, at 32 mW per square inch and wouldn't look so small anymore. This confirms all that i was saying. 10 square inches or about 3x3 would be about the size of a human organ maybe like a fist or heart and that would catch about 320 mW of power if close enough to the door.
But if i multiply that amount, 5 mW with the whole surface surrounding the oven, which is about 1/2 of a square meter or 5000 square centimeters i get... 0.005*5000 = 25 watts! (If modulated, it would reach a tower or cell phone at what distance, more than 100 miles maybe?).
Going back to cell phones, that move my needle in the same way, that amount would be 1 watt per whole head. But there are still too many unknowns. Microwave leaks from that oven that i use as reference to measure the emissions of a phone could be under the recommended limit. But i know for sure that when i bought that monitor many years ago i had an old microwave that was interfering with my satellite dish that was ft away and the levels shown with the monitor where not much greater than the ones i see now.
From what i've seen lately at politics and politicians, i don't expect anymore any kind of protection from the part of environmental agencies from hungry or dishonest or even maybe misintended sellers (or maybe the opposite) and it does not surprise me at all that we are exposed to harmful amounts of microwaves from cell and cordless phones and ultimately from ovens. There was this idea circulating in the media some time ago about getting cancer from cell phone radiation. I dismissed it because i misinterpreted what i was seeing when i bought that detector (monitor, whatever, the first picture), because emissions from cell phones seemed in the same range with leaks from microwave ovens and my monitor was in the green a few inches away from both; however, again, you don't hold an oven next to your head.
It's not cancer that you get right away but a whole list of other serious illnesses of which some me and my acquaintances are experiencing right now (of which i didn't mention thyroid problems) in people coming from generations of healthy ancestors but living in much better conditions (life quality has improved dramatically in the last 50 years or so). The fruit of my ignorance combined with trustfulness, and plain criminal, genocidal, malevolence of some.
Sunday, December 6, 2020
Maxwell's Demon Goes Electric?
So far it has been understood though the experiment is only evocative or allegorical as it can not work in reality.
You have two rooms full of gas molecules with a door in the middle, small enough for only one molecule to pass at the time. If you possess a demon (a small enough intelligent being) that has the capacity to open the small door and the energy used to open and close that door would be negligible and the demon would be smart enough to open the door each time when a fast molecule comes from right and close it when a fast one comes from left, after a while you would have all the slow molecules in the right room and all the fast ones in the left. And of course that difference of temperature could create energy if using something like a Stirling motor. But you could also commandeer the demon to open the door for all molecules coming from right or left and after a while you would have vacuum in one room and pressure in the other which again you could use to power something.
No matter how much i've searched, i could not find anything clear and simple about such a commonly seen phenomena, the speed of electrons moving in a metal. Main reason is, you guessed, nobody ever saw them moving. Everybody agrees the electrons inside a metal are in a cloud like state, with electrons moving freely around. But as for the speed, there are many differences of opinions, because of the different models they use. In classical physics, that can explain some of the phenomena, they are moving at speeds comparable to speed of light. In quantum, you guessed, they are waveforms and the speeds can't be known exactly. However they all agree about the drift speed, the speed at which the electric charges of electrons move together when an external electric field is applied, creating what they call an "electric current" but that speed is excruciatingly slow, for practical currents, (where conductors will be stable or won't heat up and vaporise) the speeds are in the order of mm/sec. From that and from calculations it results that only a very small fraction of moving electrons or better said only a small fraction or the axial component of the speed of electrons makes our practical current.
However much more is known about the flow of currents in pure (intrinsic) semiconductors. When an electric field is applied, electrons jump from one atom to another, leaving behind "holes" that in turn are creating again electric fields (on top of the externally applied field) that are attracting other electrons in a cascading effect. This way, the average speed of electrons jumping around is always limited, if not constant at a few discrete values (have to consider acceleration and deceleration between two jumps or the paths of electrons). I found a GIF that illustrates this phenomenon.
The more interesting part happens however whey you put two of these together, on the left a pure metal and at right next to it a pure semiconductor like in series and attach a battery on the sides (your electric field) in such a way (polarity) that electrons will flow from the metal into the semiconductor. Electrons cannot enter the semiconductor at the speeds they float around in metal but only at drifting speed.
Though some models say electrons move around at speeds comparable to speed of light, in all directions, if a bunch of those would hit the semiconductor they will vaporise it, hower that is not happening. What is happening though and we can measure it, is an electric current (same) is flowing through both and the speed of that current is "regulated" by the jump speed of electrons in semiconductor.
We all know that any current generated by an external field that translates into drifting (axial motion) of the electrons through a metal generates heat. Some models predict drifting current represent a very small fraction of the motion of electrons. However if the electrons were moving in the metal at high speed, they will be slowed down by collisions with the lattice and all their energy will be turned into heat.
Though, ultimately heat itself keep the electrons moving. Compared to materials that don't have free electrons, at the same temperature the lattice itself will agitate less because some of the heat will be carried by (free moving) electrons. As i just read on a site, metal is part solid with a gas or liquid (of electrons) flowing through it, which explains thermal conductivity and other phenomena.
(By this simple idea i think we can actually calculate the non-drifting average speed of the electrons at different temperatures, by rule of three or something close including the lattice vibration, starting with the temperature difference and drift speed generated by a current that we can calculate. Which shouldn't be that high. Actually comparable with the drift speed).
By continuing this line of reasoning. At a metal/semiconductor junction with flowing of current from metal to semiconductor, electrons from the metal will be caught in newly created "holes" within the semiconductor due to external field but also due to field created by the hole itself. But within certain limits, of various speeds and directions, since the speed and generally motion of electrons in metal is random due to collisions with its own lattice. Some of them will have axial speeds exceeding the capacity of the semiconductor lattice to retain them (both external and hole field) and will be rejected back in the metal though at a lower speeds (some momentum of the electron will be transferred throughout the lattice, creating agitation or heat), where they will collide again with metal's lattice again and eventually some will come back at lower speed and be retained after a number of cycles and finally start jumping, in the direction of the field, maybe a bit more at first, but not enough to overheat the lattice (we know how keep the current below that limit, from previous trials), with again some momentum (heat) transferred between them and semiconductor lattice, until all they all reach "regular" jumping speed. So here again we come to the conclusion that electrons are being selected by the junction in a way similar to molecules in Maxwell's experiment, though in both "rooms" particles (electrons) are constantly moving (flowing) to the right though in metal they are moving more, because they are moving in all directions and carry some of the total thermal energy of the metal. So from a cloud of electrons moving randomly through the metal lattice at thermal agitation speed and drifting speed in the electrical field we extract in the semiconductor only those moving at drifting speed and we can all agree that the drifting speed is lower than the average speed of electrons moving in the metal lattice.
Some would call these phenomena that occur all around us "rectifying" the brownian motion (of molecules or electrons) and it has been admitted by mainstream that if this would be possible, it would be a source of unlimited energy. That's where our intelligence must intervene and harvest the free energy that exist all around us. (If only we wouldn't be so busy with plotting and be slaves to fake theories).
Would the universe collapse or fragment or shatter into multiverses if we start doing that? I don't think so cause heat pumps do this for decades and nothing happened so far (that we know about, or maybe the Universe is not expanding so much anymore).
Got you thinking, maybe a little?
Thursday, December 3, 2020
End of Tesla Era
Much effort is being done nowadays to cover the name of Nikola Tesla, greatest inventor of all times, father of all electrical and electronic devices as we know them. One of those efforts is the brand Tesla, a startup manufacturer for electric cars only. Why should they have designed and built a car from scratch just to make it electrical? There was so much expertise at traditional manufacturers, all they have to do is replace engine and fuel tank with an electric engine and a battery. But maybe they didn't want to and Tesla is kinda of forcing them.
Nikola Tesla. Could one single person with the education and technology existing at the end of 19th century have done what he did? 700 patents? For those who don't know, a patent is some sort of juridical protection over the design of a new device or component. If you get a patent on an idea, you can make money out of it because nobody else can use your idea without your approval. It is one way to stimulate inventors and research. But in order to do so, after you "get the idea" you have to write down a complete description in such a way it would stand in court as proof it was your idea so you would discourage eventual attempts to infringe and then file that description with the authority in your country.
Anybody knows how much time it takes to write and file a patent? I'd say from one week to one month/inventor and/or attorney, depending on complexity, novelty, previously existing similar ones. Today's filing fees are more than 5000 dollars and you cannot be sure if you have it approved and especially if you will get anything in return. Smallest mistake could lead to failure to protect. Easiest way to go around a patent is to file another one and improve enough on the original idea (so you have to cover also in your description all possible improvements).
Thinking about how much money Musk's Tesla had to pay in royalties over existing patents or to lawyers to file new ones to go around those to build a car from scratch and he how gave them all away in 2014.
There are sites that made calculation on how much money Tesla have made out of his inventions and they say he should have been one of the richest people on planet at that time but he died bankrupt and senile in hotel room he wasn't paying for. That is the reason why i highly doubt Nikola did all those by himself but they were done by whole teams. Guys like Austro-Hungarian born Nikola Tesla, all the way to Intels' co-founder Hungarian born Andrew Grove, where/are just fronts, while the source of their knowledge and technology where most likely documents found in the Great Pyramid during Napoleon's invasion of Egypt. So they first had to invent Tesla.
"Tesla" did study in Austria and worked first at Budapest Telephone Company. Telephone was the ultimate thing done with wired technology, before Tesla invented wireless. Which was first attributed to the Italian Marconi. The radio.
Which what this post is all about. Radio made possible instant spread of information to the masses. If it was used for our good or for our doom. It all depends on the source of the invention, if it was from a genuine genius or from a past civilization possibly of alien origin destroyed after a global conflict with locals.I'm writing all these trying to coerce everybody into thinking. All of a sudden, at the beginning of the 19th century we get this out of this world technology which would allow those who control it to control the minds of all people.
One example which again, nowadays they make big efforts trying to cover. Like most anything.
The infamous live transmission of Orson Welles that "was performed and broadcast live as a Halloween episode at 8 p.m. on Sunday, October 30, 1938, over the Columbia Broadcasting System radio network".
«The program's format was a simulated live newscast of developing events. The first two-thirds of the hour-long play is a contemporary retelling of events of the novel, presented as news bulletins interrupting programs of dance music. "I had conceived the idea of doing a radio broadcast in such a manner that a crisis would actually seem to be happening," Welles later said, "and would be broadcast in such a dramatized form as to appear to be a real event taking place at that time, rather than a mere radio play.»
There was a warning at the beginning but who listened to that?
«The illusion of realism was furthered because the Mercury Theatre on the Air was a sustaining program without commercial interruptions; the first break in the drama was about 35 minutes after the introduction, right after Martian war machines were described devastating New York City. Popular legend holds that some of the radio audience may have been listening to The Chase and Sanborn Hour with Edgar Bergen and tuned in to "The War of the Worlds" during a musical interlude, thereby missing the clear introduction indicating that the show was a drama. However, «contemporary research suggests that this happened only in rare instances».
I think it is safe to assume that out of boredom people back then were browsing radio stations pretty much like we do today with TV channels. So what i think it happened is most people stumbled upon that transmission after it began, obviously without hearing the warning, could not ignore it and as they continue to listen until they went crazy, ran away, started to prepare, etc..
I first read about this on the early days of the internet, probably before that "contemporary research". They were talking about people listening to other broadcasts, then tuned later into this one. Hundreds of suicides and chaos all around the country.
But this was just a test. Done in 1938. They wanted to know exactly how people reacted to prepare the recipe with the right ingredients for psychological preparation for the future planned war. Or maybe it was the first mass media scale use of reverse psychology, a failed alien invasion, as many people kept asking themselves, where all this technology is coming for? Both?
But before that. Think about how radio changed the world. Some people could communicate faster than others, from unknown location to unknown location. For about 50 years very few had the technology to scan the whole spectrum. You could schedule a rendezvous with someone and transmit with a code during a very brief period, before they could find the frequencies.
But the idea behind this post is other. I've been intrigued lately, actually since i came to US about how smart people i talk to are. Like a whole bunch of experts in everything where whispering in their ears what to say.
Now we all know it is possible with the help of micro headphones. During that era Tesla was going around the country with his electricity promoting shows. Imagine him or others, like Einstein, awing other people in conversations with their genius.
Usually nowadays micro headphones are associated with much electronics, many components, blue tooth maybe which is a short waves short range type of radio communication.
I remember something since i was a kid. There is something called unpowered crystal radio. It is based on the fact that actual radio transmitters are broadcasting with unusually high power signals. In the US power for radio stations is limited to to 50kW or about twice the power needed for a car to cruise, or maybe to power 5 homes. A few miles away from the station, that power is still enough to move the membrane of a headphone, if hooked to a circuit tuned on that frequency. The "crystal" is a form of an early diode which was capable of rectifying (back then it was called "detecting") the high (radio) frequency of a tuned circuit made of a capacitor and a coil and turn it into a signal that could move (vibrate) a headphone's membrane enough for someone with good hearing, like a kid, to hear the broadcast. So it was also possible with the technology of those times to make a sound heard with a small power over a short distance. But i bet you don't even need a crystal for that. You can have stuck in someone's year a tiny coil that would vibrate a membrane if the transmitter is within a few meters. To greatly enhance the appearance of personalities in public. I imagine on the other side of the curtain or wall or inside a van all the experts relaxed in armchairs next to a transmitter saying (whispering) the next line. Lucky those who were convinced cause i assume only the ignorant survived Tesla Era which is being brought to an end nowadays as we speak by the new technology, the Internet, which finally gives all the people the freedom to exchange information. Though very late.