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Radio waves - DON JOHNSON's Blog

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Radio waves

Blog Posted:7/1/2011 3:04:00 AM

Radio waves
Being a sometimes Ham radio operator, vk4pr.
I’m interested in this subject

Yes radio waves, tv waves, are all in the air around you, all you need is something to grab em.
A tuned circuit, a crystal set does it ....hook its antenna connection to a long wire and the radio waves come into it. The wave you want is grabbed by the tuner part of the crystal set .
A trap is used to get it?
In your battery radio you will see the tuning capacitor which moves as you change channel.
Alongside it you wil see a ferrite rod maybe with lots of wire wound on it.
So what you have is a movable condenser/capacitor in parallel with it sort of grabs the radio wave
at variable frequencys.
At the frequency you have selected or found by moving the condenser part ..Then the radio wave at am radio might be 512,000 times a second, how often it cycles per second, frequency vibration .
(we vibrate 6 times a second I’m told…10 times might be fatal, they tested that idea too, after an elevator buzz was making people sick in a building)
They say hertz per second but it used to be cycles per second 50 years ago.
So the aerial brings the frequency into the radio tuned trap of the coil and capacitor at 512kilocycles per second. Then it loses half or its cycle passing through a diode one way valve ( a one way only gadget) to get the voice audible . Now it goes to your crystal headphones so you hear the voice, or it goes to an amplifier and your woofers.

11 metre Cb radio 27 million cycles per second , used a quarter wave antennae about 9 foot long on your car. Good for taking out fluros at drive through bottle shops
But 2 metre ham radio at 146 million cycles uses about a 19 inch long quarter wave antennae. Frequency faster ariel gets shorter. It all works if you use maths . The mobile phone /radio uses a tiny antennae on it 2way radio and transmits a few milliwatts of tickle in your ear to the tower and your friend.
468 divided by 27 = 17.3333333333333333 etc feet so split it in the middle it will resonate around
27 megarhertz our cb frequency , half wave ant. Shorten or make longer to change the frequency per second. on your car you use half 8.6666666 feet the car body becomes the other half of a tuned circuit, a quarter wave vertical antennae.
So shorten length of vertical antennae to go back towards 28 megacycles.....faster cycle per second Shorter antennae...
The Ark of the Covenant might have been a radio it seemed to be a big capacitor and had dangerous voltages on it that killed men if handled wrongly. The old time valve radios also have dangerous voltages like the valve final amplifiers on Kenwood 520 Ham radios of the past.
By Don Johnson

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  1. Date: 7/6/2011 1:50:00 PM
    Big D: What an interesting bio and great photo of ya, Mate! One of these days I'll figure out how to get my mug & bio on here - have to check that out with me grandkids who are much smarter than I. Glad to have you aboard and good on ya' always! G'day and keep them intriguing writes coming for our delight and amusement. Enjoy them all!

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  1. Date: 7/2/2011 12:26:00 PM
    radio waves extend from your own vibes DON luv.. and yours are super powerful..oh... so feeling those frequencies much.. zzzzzzzzzap..

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  1. Date: 7/2/2011 4:41:00 AM
    don, can this kind of frequency reach E.T.?? you hobby fascinates me:) hugggs!

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  1. Date: 7/1/2011 11:26:00 PM
    On ya Jimbo get the spark, catch a shiela not a shark, gotta put me mouth in park, or i'll be slight abused:)

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  1. Date: 7/1/2011 11:23:00 PM
    Apologies ladies for taking the floor. Just another hobby i'll get more. If things don't bring me back:)

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  1. Date: 7/1/2011 11:20:00 PM
    Francine, Tune for smoke the old Hams said, something burning is it Ned, when your yakking on the line, fluros flash radiations fine. (an they arent turned on) so ya got more radiation in the room, than yer mobile 10 times soon. love, Don

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  1. Date: 7/1/2011 11:13:00 PM
    Yes Chris D Monatomic might have been, lost the knowledge of it seems, moses boys were insulated, sparks were jumping smoking, inhalelated:) they drew short rocks to carry the Ark old mate:) Don`

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  1. Date: 7/1/2011 11:07:00 PM
    On ya William 73s mate, have n old kenwood 520 in the cupboard, long time away from the morse code getting rusty in the head. Have to make me a dipole to get on 40mtr, all good mate....Don

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  1. Date: 7/1/2011 9:44:00 PM
    Don, 73's from the States. K7ATX here. Call me on 40 meters almost any time. I'm ill and a shut-in so I have little that I am able to do but I can still X-mit. Also I love to use CW. I don't think anyone uses Morse any more. Best Wishes to you. Will AR

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  1. Date: 7/1/2011 9:20:00 PM
    I love this stuff haha! Not sure about the Ark of the Covenant being a radio though? Could very well be true. Heard a legend about it housing a m-state power source(monatomic platinum and a philosopher's stone??), and that a few dudes were electrocuted after touching it wrong, and for two years, King David refused to have it stored in his city lol :D

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  1. Date: 7/1/2011 5:28:00 PM
    I feel like Constance on seeing this blog.haha. but yes,I am happy that you have hobbies that are so interesting to you!

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  1. Date: 7/1/2011 4:08:00 PM
    huh you lost me lol cory

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  1. Date: 7/1/2011 10:19:00 AM
    the only ham radio I've ever seen is in the movie "Frequency".

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  1. Date: 7/1/2011 7:53:00 AM
    'bout as good as it gets Don!!!!what a ride!!!! jimbo

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  1. Date: 7/1/2011 3:44:00 AM
    You sure lost me....too technical.

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