Newton

bitcoin

hey @k00b do you plan to integrate BOLT12 as an option for the wallet?

iguano

Is there any way I can turn cowboy credits into sats?, I'm already an old man and I don't understand this very well

Construction_and_Engineering

In rural areas, where medium and short waves are still widely used and even in places where FM signals are weak, it is common to use a piece of wire as an antenna. One question that arises is the following: I am going to use a piece of wire as an antenna for my medium wave radio, because in the region where I live the stations are distant and weak. Do I need to strip the wire? The answer: It is not necessary to strip the wire, because the plastic or other material cover is a dielectric and, therefore, radio waves pass through. You can keep the cover on and it is even better, to avoid contact with other objects that could divert the signals to the ground. For medium waves, stretch the wire away from metal objects or large structures that could affect propagation or even divert the signals to the ground. Avoid proximity to power transmission lines, because they radiate interference. The higher the better, preferably attached to two masts. In the image, an “outdoor” antenna using a tree and a stretched wire.

![](https://m.stacker.news/70337)

Wire Covered as Antenna

Showing the various components responsible for heating food. At the core is the magnetron, which generates microwaves when powered by the transformer. These microwaves are then directed into the cooking chamber through the waveguide, where they interact with the food. The antenna helps distribute the waves evenly, while the cooling fan prevents overheating of components. A diode and capacitor are involved in managing electrical flow and maintaining proper microwave generation. The image also highlights the transformer's role in converting electrical voltage to the necessary level for the magnetron to operate. This comprehensive diagram provides a clear view of how a microwave oven functions.

![](https://m.stacker.news/70198)

The inner workings of a microwave oven

They didn't have Eltron, but some humorous writers wrote very interesting stories related to the technology of the time. In this story from 1923, the author tells how a lady managed to boil Dutch Limburg cheese (famous for its bad smell) and then let it crystallize and obtained a detector crystal with incredible properties. By placing it in a receiver, she was able to receive messages from Mars. It was a time when it was believed that intelligent creatures existed on Mars. The idea is left for Eltron. In fact, he is already thinking about using his smelly sneakers to make a quantum signal detector.

![](https://m.stacker.news/69858)

Communications with Mars in 1923

Have you ever heard of Penniac?

At the time of ENIAC, we immediately imagined that it was a computer. Yes, it was a gaming computer or a primitive video game with TTL logic. From the image on the cover of the magazine, we can see how digital assemblies were made. Lots of wires, lots of stacked boards, and if there was a simple error or soldering problem, it was not easy to locate the problem. At the time, it cost $150 (which was a lot). The game imitated the game of guess the coins. The human (player) chose heads or tails and the computer had to guess the choice. The block diagram shows that it was not as simple as it seems.

![](https://m.stacker.news/66996)

Hello, I'm Newton, I'm an engineer and physics teacher.

@Newton's bio

A physicist checking the operation of a circuit with a Klystron valve generating a 60 GHz signal. At that time, the higher bands of the microwave range were already being reached with experimental equipment. The Bell Telephone laboratories were always announcing new discoveries in the field of technology.

![](https://m.stacker.news/66937)

60 GHz with the Klystron in 1956

The idea of a cell phone embedded in the teeth is not very new. By directly stimulating the auditory nerve, people would not need to wear headphones to listen and would simply need to speak, since the microphone would be inside their mouth. The number would be dialed by voice command, since the circuit would be intelligent enough to understand this... This innovation is already being tested in Japan, as a technological alternative that shows the trend of electronics becoming part of the human body itself. This is what we call bionics, that is, the application of electronics in biology and vice-versa, with an integration between the living and the technological in such a close way that we can no longer know exactly where one ends and the other begins. Going a little further, it seems that soon dentists will need to be trained in electronic technology, since more things are being announced for the implantable teeth of the future.  This is the case of a company that is advertising a tooth equipped with an internal reservoir of medicines, for people who need them constantly, who do not remember to take them at the right time (or cannot) or even in emergency situations.

![](https://m.stacker.news/66660)

Electronic teeth

If you think that unmanned vehicles used for dangerous observation or even combat are something new, you are mistaken. Of course, you cannot expect the use of inertial sensors, Bluetooth communication, GPS or other microprocessor solutions in a version from 1917. A remotely guided torpedo with electric propulsion, but the propulsion was done by wires! At that time, battery technology was not sufficiently developed to adopt this solution. In the figure below, we have the project described by Gernsback, which had a power cable that unrolled when the torpedo headed towards the enemy. If we analyze how flying drones behave today, even carrying weapons, guided by GPS, we see how much we have evolved in terms of technology in less than a century.

![](https://m.stacker.news/66520)

Drone from 1917

just like our ancestors did in the days before valves with their powerful transmitters. Were they spark-gated? To generate a high-frequency alternating current and apply it to an antenna, they used huge alternators in the stations, like the one in the photo in a magazine article. Voltages of thousands of volts were generated and applied to the antenna. The 100 kW alternator at the New York Radio station produced a signal in the 300 (1MHz) band. At the time, according to the article, there were about 600 of these alternators in operation in radio stations throughout the country, in cities like Chicago, San Francisco, etc. I'll tell you how the modulation was done some time.

![](https://m.stacker.news/66414)

Transmitter without valves

The antenna mounting devices shown in the figure are antenna rotors that were widely used at the time. At that time, TV signals would sometimes come from different directions in relation to your home. So when you changed channels, you also had to change the direction in which the antenna was pointing. For this purpose, there were rotors that were remotely controlled, as advertised.

![](https://m.stacker.news/66318)

Do you know what these devices are for?

In old projects, a type of connector was used that can still be found today and is very useful in experimental or educational assemblies. It was very easy to use. All you had to do was press it, insert the wire or terminal of the component and it would hold. The image shows an example of a project for an old radio using this type of connector.

![](https://m.stacker.news/66287)