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Updated: May 6, 2025
In order to secure the reproduction of the higher audio frequencies, it was found necessary to run the tape at a rate of 90 metres per minute past the recording and reproducing heads. This meant that the length of tape required for a half-hour's programme was nearly 3 kilometres! Brief description of the ribbon or velocity microphone.
The result is that these oscillations of different frequencies interfere and reinforce each other when beats are produced, the period of which is slow enough to be heard in the headphones, hence the incoming signals can be heard only when waves from the sending station are being received. The Autodyne or Self-Heterodyne Long-Wave Receiving Set.
Then, while Crane and the women scrambled up off the floor and hurried to the visiplates, Seaton cut in rays six, two-seven, and five-eight. Ray six, "the softener," was a band of frequencies extending from violet far up into the ultra-violet.
They saw the magnificent spectacle of solar prominences shooting hundreds of thousands of miles into space, and directly in their path they saw an immense sunspot, a combined volcanic eruption and cyclonic storm in a gaseous-liquid medium of blinding incandescence. "Better dodge that spot, hadn't we, ace? Mightn't it be generating interfering fourth-order frequencies?" cried Seaton.
But George Gerardos, SV1AG, who had been closely involved, decided that it would be better to overlook certain details which may seem strange to us at the present time details which could be rectified at a later date, provided the law was finally on the Statute book. For instance, I refer to the very restricted frequencies we were allocated in the 80-metre band, 3.500 to 3.600 MHz.
To produce these beats a receptor can use: a single vacuum tube for setting up oscillations of both frequencies when it is called an autodyne, or self-heterodyne receptor, or a separate vacuum tube for setting up the oscillations for the second circuit when it is called a heterodyne receptor. The Autodyne, or Self-Heterodyne Receiving Set.
And as much as he wrote, he was only able to record a tiny fraction of our history. Since then, many people have contributed. Some more than others." "I wonder why no one in America was able to tune into Oz before L. Frank Baum," Graham said. "Because there are millions of frequencies, but he happened to hit the right one one day when he was telling stories to the children.
Much as a top, spinning off-center on its point, will swing slowly around that point instead of tipping over, the spinning protons in the magnetic field would precess, but would not tip and line up without the application of a rotating secondary magnetic field at radio frequencies which would make the feat of lining them up easy.
At these frequencies, the three centimeter band of the electromagnetic spectrum, energy does not flow on wires as it does in the lower frequency regions. Here plumbing is required. But Mike, amongst other things, was an expert RF plumber.
Some of the experiments may be performed with low frequencies; but very high frequencies are desirable, not only on account of the many effects secured by their use, but also as a convenient means of obtaining, in the induction apparatus employed, the high potentials, which in their turn are necessary to the demonstration of most of the experiments here contemplated.
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