Thank you for posting this. There are VERY few remaining complete sets of this Type. Just looking at that coherer box with a complete spare coherer makes my eyes water... That set is more than a scientific toy. This Braun/Siemens & Halske demonstration set actually employs closed tuning circuits on the transmitter and the receiver, based on Ferdinand Braun's 1898 patent. Coherer/decoherer and receiving circuit were identical to the commercial sets sold by Siemens between 1900 and 1903, when the Braun/Siemens System was integrated into the Telefunken company. The technology shown here was state of the art until approx. 1906 - 1908, when almost at the same time the quenched spark system (Telefunken) and the Poulsen arc system (Lorenz/Poulsen) came about. You made my day!
Aah, reminds me of my childhood. But my father and I didn´t use the Braun circuit (yet), but just a tuning coil, spark gap and *big antenna and earth* in series. Our receiver was just a piece of straw filled with metal powder, and 2 nails put in as ´tube closure´. The indicator and tapper was the same milliampere meter, which slammed it´s needle back/forth when signals were incoming. However, when the signals got too weak, and the needle didn´t strike hard enough against the coherer, it had a tendency to ´get sticky´ and need some outside assistance to get the job done. The Brain System is a lot more complex than most people realize, and spark transmitters in general are a lot less easy to operate than most people think. The principle itself is all too simple, but operating a ´Rumbler´ (that´s how they called these low-frequency, rough sounding transmitter in the literature of around WW1) correctly is quite the affair! A lot of how far, how clean, and how good your signal will be depends purely upon operator skill. And with increasing amounts of ever more sensitive radio receivers in use by the general public in the mid-20s, combined with ever more amateur operators who had very little to no experience operating ´cleanly´, the ´Megahertz Bandwidth Myth´ was born: the spark transmitter is a filthy (spectrally) mode of producing radio waves, disturbs all communications in an entire frequency band, etc. While in reality, due to an inquiry held by the ARRL (first Amateur Radio Service in the world) between 1919 and 1924, it became clear than over 9 out of 10 (!!) complaints by people listening to broadcasts ´being disturbed by amateur spark transmitters´ turned out be false reports. Most of the time it SOUNDED like a spark transmitter of the Braun Type, like an electric DC-motor revving up or a Ford T´s ignition system while driving by.... However, it was inevitable that Spark as the dominant mode would die out, but quite a few people would be surprised that even in the 1960s, Spark or B-mode, was still in (limited) use in Germany due to post-war shortages of vacuum tubes and components! It was than often used as a beacon transmitter, with a loop-antenna attached, since this reduces interference even further. This ´Loop Spark Transmitter´ technology was first developed during WW1 for use in the trenches. Apparently ranges of 6 to 12 miles were achieved on 3 different wavelengths, depending on location of this ´spark´ transmitter (it was a so-called buzzer-transmitter, nothing but a *big, very fast* relay with heatsinks that required no more HV generation, since the back EMF of the self-interrupting relay it´s coil was used to provide the high voltage for the Capacitor or Antenna! No picture available at this time, will upload one later.
Good lord my man!!! HOW OLD are you!!!??? I'm 73, by the way, from the N end of Idaho State, and was first licensed as an amateur in about 1965r, transmitter --then Novice class, crystal controlled, 75W "DC input" limited. If it weren't for the QRP hobby, most operators would have no idea how to deal with operating "split" freq on cw, especially with a drifty receiver!!!
The range of the signal depends on a multitude of factors and I just mention some of them: power of the emitter, sensitivity of the detector, frequency of the signal, dimension and shape of the antennas, etc. etc. but also meteorological conditions, presence of obstacles.... These particular type of didactic wireless apparatus could work on a distance in the order of a few dozens of meters. Generally it was used in a large lecture room or in an amphitheatre. Thanks for following channel
It'd be awesome if you can get someone trained in Morse Code as a hobby or a retired Navy vet to put it through it's paces like it would of been back in the day.
Thank you for posting this. There are VERY few remaining complete sets of this Type. Just looking at that coherer box with a complete spare coherer makes my eyes water...
That set is more than a scientific toy. This Braun/Siemens & Halske demonstration set actually employs closed tuning circuits on the transmitter and the receiver, based on Ferdinand Braun's 1898 patent. Coherer/decoherer and receiving circuit were identical to the commercial sets sold by Siemens between 1900 and 1903, when the Braun/Siemens System was integrated into the Telefunken company. The technology shown here was state of the art until approx. 1906 - 1908, when almost at the same time the quenched spark system (Telefunken) and the Poulsen arc system (Lorenz/Poulsen) came about.
You made my day!
Great to see being operated in stead of just gathering dust
Love this video. The approach in all steps were easy to follow.
Aah, reminds me of my childhood. But my father and I didn´t use the Braun circuit (yet), but just a tuning coil, spark gap and *big antenna and earth* in series. Our receiver was just a piece of straw filled with metal powder, and 2 nails put in as ´tube closure´. The indicator and tapper was the same milliampere meter, which slammed it´s needle back/forth when signals were incoming. However, when the signals got too weak, and the needle didn´t strike hard enough against the coherer, it had a tendency to ´get sticky´ and need some outside assistance to get the job done.
The Brain System is a lot more complex than most people realize, and spark transmitters in general are a lot less easy to operate than most people think. The principle itself is all too simple, but operating a ´Rumbler´ (that´s how they called these low-frequency, rough sounding transmitter in the literature of around WW1) correctly is quite the affair! A lot of how far, how clean, and how good your signal will be depends purely upon operator skill. And with increasing amounts of ever more sensitive radio receivers in use by the general public in the mid-20s, combined with ever more amateur operators who had very little to no experience operating ´cleanly´, the ´Megahertz Bandwidth Myth´ was born: the spark transmitter is a filthy (spectrally) mode of producing radio waves, disturbs all communications in an entire frequency band, etc. While in reality, due to an inquiry held by the ARRL (first Amateur Radio Service in the world) between 1919 and 1924, it became clear than over 9 out of 10 (!!) complaints by people listening to broadcasts ´being disturbed by amateur spark transmitters´ turned out be false reports. Most of the time it SOUNDED like a spark transmitter of the Braun Type, like an electric DC-motor revving up or a Ford T´s ignition system while driving by.... However, it was inevitable that Spark as the dominant mode would die out, but quite a few people would be surprised that even in the 1960s, Spark or B-mode, was still in (limited) use in Germany due to post-war shortages of vacuum tubes and components! It was than often used as a beacon transmitter, with a loop-antenna attached, since this reduces interference even further. This ´Loop Spark Transmitter´ technology was first developed during WW1 for use in the trenches. Apparently ranges of 6 to 12 miles were achieved on 3 different wavelengths, depending on location of this ´spark´ transmitter (it was a so-called buzzer-transmitter, nothing but a *big, very fast* relay with heatsinks that required no more HV generation, since the back EMF of the self-interrupting relay it´s coil was used to provide the high voltage for the Capacitor or Antenna! No picture available at this time, will upload one later.
Good lord my man!!! HOW OLD are you!!!??? I'm 73, by the way, from the N end of Idaho State, and was first licensed as an amateur in about 1965r, transmitter --then Novice class, crystal controlled, 75W "DC input" limited. If it weren't for the QRP hobby, most operators would have no idea how to deal with operating "split" freq on cw, especially with a drifty receiver!!!
Molto bello :)
If you need infos (measurements etc.) for reconstricting your coherer do not hesitate to contact me.
1:00 is that the sparks come from the Charged Leyden Jar or from the ruhmkorff coil that not charged from leyden jar?
That's a lovely apparatus.
We appreciate your comment. We know your great Museum!
What exactly determines the range the signal can travel?
The range of the signal depends on a multitude of factors and I just mention some of them:
power of the emitter, sensitivity of the detector, frequency of the signal, dimension and shape of the antennas, etc. etc. but also meteorological conditions, presence of obstacles....
These particular type of didactic wireless apparatus could work on a distance in the order of a few dozens of meters. Generally it was used in a large lecture room or in an amphitheatre.
Thanks for following channel
@@florencefst Thanks for the answer. 😊
Wait so on ships like the titanic they had two separate wireless telegraph machines so they can both send and receive messages simultaneously?
I successfully replicated it. Thnx for the help
It'd be awesome if you can get someone trained in Morse Code as a hobby or a retired Navy vet to put it through it's paces like it would of been back in the day.
....se a scuola le lezioni fossero state cosi bene illustrate.......sig ;-(
First video ever where there js 0 dislike
not anymore!
Thanks for following channel
Woooooooooooooooooooooooooow
We've got one of those at the three minute mark!
far from clear, especially at 2'30