#Sm6lkm vlf receiver generator
#Sm6lkm vlf receiver software
#Sm6lkm vlf receiver series

#Sm6lkm vlf receiver software

The software I'm using with a Windows laptop is SAQrx ver 0.98 by Johan Bodin, SM6LKM. I recommend that you follow the modification in the recent Service Bulletin 3 and add a 1000 uF capacitor to the 5V input for best results. The output from the Loop Antenna Amplifier is high enough to directly drive a computer sound card so with a bit of software you don't need an exotic VLF receiver to hear the transmissions, just a BNC male to 3.5 mm jack cable to the audio in socket. I've been setting up a VLF/HF Loop Antenna Amplifier with a bicycle wheel rim loop getting ready to receive the transmission. Each Christmas Eve the SAQ VLF transmitter in Sweden sends out Christmas greetings on 17.2 kHz. I think i saw the transformers design you made a while back i think they are 60hz transformers not sure they would be good working at higher frequencies i rather use transformers as well than winding them i am now trying audio output to speaker transformers they must have the bandwidth or they would not use them at these frequencies. I have not had much luck on the voice side of magnetic amplifiers but the past system didn't use a carbon mic and i have just been trying a second magnetic speaker which i need to try the carbon mic which does seem more logical to work with a magnetic amplifier.

with out it i can get up to 100 volts out of the stepper in my system.

#Sm6lkm vlf receiver generator

I to have been experimenting on and off with magnetic amplifiers and a mechanical oscillator such as the stepper motorД«ecause we need the band width for voice need as high a frequency as possible with the stepper generator my interest is in the bandwidth for NBTV so thats a bit higher as well.ДЄny case in my experiments your better off with a pulley system and get the ratio of the pulley wheels so the dc motor moves the stepper faster i also found passive frequency multiplier will increase the frequency but it will drop the voltage. More info to follow as I figure out an effective means of displaying this amplification. Unlike a tube which controls DC plate current with a DC grid voltage, a 'mag amp' controls AC current with a DC current. Connecting the 9V battery across the two 120V windings causes partial saturation of the two magnetic cores, reducing their effective inductance, and delivering more voltage to the load. This impedes the delivery of voltage to a resistive load. Meantime the first transformer sees just the inductive reactance of the parallel 12V windings.

#Sm6lkm vlf receiver series

The corresponding 120V windings are connected in series and phased so that the net induced voltage is zero.

This voltage is applied to parallel connected 12V windings of the other two transformers. The transformer next to the 'alternator' steps the voltage down to 12V. the latest addition is a 'sky-wired' magnetic amplifier consisting a three 120V:12V transformers. Upton O'Goode wrote:Beautiful work, Roger! I plan to experiment with a вЂњmagnetic amplifierвЂќ as used with the later Alexanderson alternators. The modulator will also be an electro-mechanical device something more sophisticated than the original microphone in the antenna. When hooked up to the 16,000 RPM motor, things could get interesting! These key components have yet to be coupled together, but hand-spinning the shaft of the stepper delivers a 40 volt, 1 kHz output. My вЂњmini-alternatorвЂќ will use the same means to generate an RF carrier a DC motor driving a stepper-motor configured as a generator. The inspiration for this project comes from M0BMUвЂ™s electro-mechanical VLF receiverвЂ¦ Later models had rotor speeds of 20,000 RPM and could deliver hundreds of kW at frequencies up to 100 kHz. Powered by a steam turbine and electric motor, the original alternator spun at 10,000 RPM and delivered around 250 watts at 60 kHz. This historical event was made by Reginald Fessenden in 1906, years before suitable vacuum tubes were available.ДЇessenden used a high-frequency alternator designed by GE engineer Ernst Alexanderson to generate an RF carrier. The next project aims to demonstrate the first successful voice transmission using radio.

Moving into the 20th century, my spark transmitter demo project has been retiredвЂ¦