SAQ Grimeton Christmas transmission
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- Опубліковано 22 гру 2023
- 08:25 CET (07:25 UTC): Live video from World Heritage Grimeton Radio Station begins
08:30 CET (07:30 UTC): Startup of the Alexanderson Alternator SAQ from 1924.
09:00 CET (08:00 UTC): Transmission of a message from SAQ. - Наука та технологія
Thats soo cool, absolutly amazing old machine, i love these machines a great thank you to all those make this possible to keep alive and keep running. wow
Well done, once again! 🤩 Thank you to the whole team for a successful Christmas transmission and the incredible work you are doing with keeping our heritage alive together with us.
Merry Christmas to you and your beloved once! ❤️
/ The whole team at Grimeton World Heritage Foundation
Got it! With my self wound Antenna and my SDRplay near Bonn, Germany - Thank you for running this unique historic transmitter and give us that christmas present 👍
So happy to have found this wonderful video of this unique station. Also very happy to know it is kept in working order, an important part of radio history. Happy Christmas and best wishes for the new year!
une merveille dingenierie ; fonctione encore apres tout se temps
Impressive!! I saw my sister daughter waving! 88 from ex SM7HUF, now watching youtube but can still read the morse code. Learned it in 1965 at Ing2, Eksjö.
Merry Christmas from PA, USA🌲
Received again with no problem on my Wellbrook loop and Winradio Excalibur. Signal at -100dBm, ten dB above local noise. Many thanks for the TX and a Merry Christmas to all!
Merry Christmas and have a Happy New Year 🎉! Thank you for this wonderful transmission…73!
Merry Christmas, Joyeux Noel, from Michelle and Geir (LA9ET), Norway / France
Merry Christmas everyone
99 Years ago the engineers were really outstanding.
Just happened upon this by chance, just marvelous. Thanks for your efforts.
Excellente Video, Merci pour votre Partage Exceptionel ,Joyeux Noel a toute votre l'équipe, au Plaisir
Mooi weer te zien nadat we er zelf zijn geweest dit jaar
Big thumbs up for how You in Sweden respect such a fascinating piece of historic technological beauty. Meanwhile here in Italy , homeland of Marconi we switched off all the MW transmission and WE DESTROYED of the TX sties and related radiating towers ... literally...
Good morning... We enjoyed the broadcast here in Brazil, but I got the time of the online event wrong. I wish you all a Merry Christmas and congratulations on the work you do in Sweden together with UNESCO. Here in Brazil we affectionately call the transmitter "Godzilla Transmitter". God bless you all.
An excellent presentation! Merry Christmas.
This is Wild 😮
❤❤❤❤❤👍👍👍👍👍👍👍
Damn - I slept through the broadcast by an hour this year. Christmas usually starts with SAQ. This year, unfortunately, it has to go without. I wish you happy holidays and a successful new year.
Good morning from Los Angeles. I missed it last night. Sorry about that.
Have a great one all, W6CAS
How interesting radio communications were before vacuum tubes came out: Long wave frequencies generated by rotating machines with morse code signals. All electromechanical. The old Rocky Point and MacKay Radio stations must have been like that, I guess, because I have never been inside these places. In America they were called Alexanderson generators. The antenna consisted of miles of telegraph wire.
North thuringia, NO signal! 😞
Receiver: ICOM IC-R 8600, 16m long wire antenna (north-south) with balun.
After christmas I ask an amateur colleague to help!
Greetings from germany
Centerfuuugal pump
I did not know that. When is the next broadcast expected? Thanks! Merry Christmas!
Grimeton Radio Station Crew! Ein Schönes Weihnachtsfest! Grüße Aus Deutschland Thüringen Am Kyffhäuser! Micha AxtOi!
Bist du irgendwie blöde?
Der SAQ I am a Japanese amateur radio operator. Excuse me, but how does Morse code turn on and off by emitting radio waves? A long time ago, when I was a student, I studied magnetic amplifiers.It seems like the switching action of a magnetic amplifier.Please let me know if you have any references.
Here’s a simplified description of how the morse code is created when transmitting with SAQ:
The Alexanderson alternator is supplying a magnetic flux with the frequency 17,200 Hz, or 17.2 kHz via 64 separate windings, each delivering 100V and 30A, which is led to two separate transformers in the high frequency amplifier. 32 leads are going to the first transformer and another 32 leads are going to the second transformer.
Each transformer then has 32 individual primary windings, each of them electrically insulated from each other.
2000V is generated in the secondary winding of each transformer. The secondary windings from both transformers are connected in parallel and further connected to the antenna.
However, there is also a third winding in each transformer, located between the primary and secondary winding. This winding can be supplied with 250V DC, 12A current (3kW), controlled by the morse key. When the morse key is up (no signal) the DC current is flowing through the third middle winding, reducing the amount of energy being induced from the primary to the secondary winding.
At key-down, the current in the middle winding is blocked, and full power is induced into the secondary winding.
So, at key-up there will be a very limited amount of energy going out into the antenna. The magnetic amplifier is simply “leaking” a little carrier wave, which can be detected if you have a sensitive receiver.
In addition to the two transformers, there is a second system, also operated by the morse key, to alter the antenna resonance frequency.
In the lower part of the “magnetic amplifier” two “transductors” are located. A transductor is a variable inductance, consisting of a primary winding for the AC and a secondary winding for DC, both placed around an iron core. The iron core works as an inductance for the AC winding, however when 250V 30A current is flowing in the DC winding, the iron core is magnetically saturated and thus reduces its inductance.
The antenna is a resonant circuit with its resonance frequency set to 17.2kHz and the two transductors are connected inline with the antenna.
This means that by key-up, the antenna is not tuned to the resonance frequency, due to the changed inductance in the two transductors.
At key-down, the 250V 12A DC current is blocked, the inductance will be altered and the antenna will be in tune.
Ernst Alexanderson invented this system, with all its components, to allow a relatively small DC current of 3kW to control a very large power of 200kW.
Fredrik / Alexander association
Here nothing to recive .. bad conds
Thanks for all..73 de DM7JO
* Watching the transmitter being powered up *
Me: I want one!
Wife: Why am I not surprised?
Good job, folks. 73 de N7KBT
Hello! I receive the broadcast in Hungary at Lake Balaton. RECEIVER E530 SIEMENS, VOLNA K SOVIET! T- antenna. HA3KGX