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Wilaade Home Care - Christiana, Bedford
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first created 20170413 from wwwloop2016.htm

Last updated:20190220


 


    "Hello Daddy, hello Bruce," said Miranda. 
    "Hello Miranda," said Bruce. "Your father has been telling me about the star dates."
    "Yes," said Miranda's father, "but I am sure you both have lots of other things to talk about, and I am feeling a bit tired, so I think I will go for a rest in the garden." 

    Bruce and Miranda talked for a while, and then Bruce asked, "What happened on May 14th 1963 ?"
    "That is the day my father transmitted a radio signal to the stars," said Miranda. "Shall I tell you about it ?" 
    "Yes please," said Bruce. 
    So Miranda told the story. "My father has always been interested in radio, since he was at school. He was particularly interested in very low radio frequencies." 
    "Are those the frequencies lower than used by broadcast radio stations ?" asked Bruce. 
    "Yes," said Miranda. "Broadcast radio uses frequencies down to about 150 kilohertz, that is, 150 thousand cycles per second. Below 150 kilohertz and down to about 10 kilohertz the radio frequencies are used by ships and aeroplanes to find where they are, and for sending messages to submarines under the sea." 
    "Can frequencies below 10 kilohertz be used for radio ?" asked Bruce. 
    "Of course," said Miranda, "although many people confuse these low radio frequencies with the audio frequencies that we can hear."
    "How low can you go ?" asked Bruce. 
    "You can go as low as you like," said Miranda, "but the really interesting frequency is very close to 12 hertz." 
    "If that was an audio frequency," said Bruce, "it would be lower than we can hear. Why is 12 hertz so interesting ?" 
    "My father wanted to listen to these extremely low radio frequencies, just to find out what was there. Of course he had to make all his own equipment, there was nothing he could buy, but fortunately at low frequencies the equipment is not expensive to make. He made many receivers, each one a bit better than the one before, and usually tuning to an even lower frequency. At first he used a long length of wire for the antenna, but as you go down in frequency this does not work so well because there is more interference."
    "What causes the interference ?" asked Bruce. "Does the interference come from things like electric motors which cause interference to normal radio ?"