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The True Story of the Philadelphia Experiment
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<blockquote data-quote="TimeFlipper" data-source="post: 157452" data-attributes="member: 6456"><p>Quoting the previous posting and its first paragraph: A magnetic field "created" with an Audio AC can be heard with a pick up coil plugged into a small amplifier..</p><p>This magnetic field can be made to fill an entire house by running one turn of copper wire around the house and driving it with the speaker output of a small transistor radio...</p><p></p><p>Essentially what is being said is that a standard electro-magnetic wave has been made and put into an antenna, along with a receiver to hear it...</p><p>A basic radio transmitter creates an Alternating Current output (AC), that is derived from Voltage divided by Resistance and contains an "impressed or synthesised" audio wave, which in turn is fed into a suitable antenna that converts it into a standard electro-magnetic radio wave... Or i have been tutored very badly.</p><p></p><p>Standing Waves are borrowed from physics...We have in our Amateur Radio transceivers a built in Standing Wave Ratio (SWR) meter, which is essentially an impedance monitor for the antenna..If the SWR meter registers 1:1 (one to one), that means we have a perfect match from the transmitter output to the Antenna input...However if the meter registers 1:10 (one to ten), then we have a serious problem in the form of the output from the transmitter is being blocked from getting into the antenna...This is caused by the hypothetical standing waves originating from the antenna, and consequently we have a build up of power going nowhere, which is rapidly building up in the transceivers output and results in a part of the transceiver literally blowing up!...</p><p></p><p>Briefly, the way we avoid that happening, is when we first switch on our transceivers we make sure the power output is very very low, and then we transmit...If the SWR meter is reading for example1:10, we know that there must be a problem with the antenna...Either it has been blown over by winds or one of the leads going to the antenna from the transceiver has been disconnected, probably by winds...and of course we rectify the situation <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite59" alt="(y)" title="Thumbs up (y)" loading="lazy" data-shortname="(y)" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite45" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" />..</p></blockquote><p></p>
[QUOTE="TimeFlipper, post: 157452, member: 6456"] Quoting the previous posting and its first paragraph: A magnetic field "created" with an Audio AC can be heard with a pick up coil plugged into a small amplifier.. This magnetic field can be made to fill an entire house by running one turn of copper wire around the house and driving it with the speaker output of a small transistor radio... Essentially what is being said is that a standard electro-magnetic wave has been made and put into an antenna, along with a receiver to hear it... A basic radio transmitter creates an Alternating Current output (AC), that is derived from Voltage divided by Resistance and contains an "impressed or synthesised" audio wave, which in turn is fed into a suitable antenna that converts it into a standard electro-magnetic radio wave... Or i have been tutored very badly. Standing Waves are borrowed from physics...We have in our Amateur Radio transceivers a built in Standing Wave Ratio (SWR) meter, which is essentially an impedance monitor for the antenna..If the SWR meter registers 1:1 (one to one), that means we have a perfect match from the transmitter output to the Antenna input...However if the meter registers 1:10 (one to ten), then we have a serious problem in the form of the output from the transmitter is being blocked from getting into the antenna...This is caused by the hypothetical standing waves originating from the antenna, and consequently we have a build up of power going nowhere, which is rapidly building up in the transceivers output and results in a part of the transceiver literally blowing up!... Briefly, the way we avoid that happening, is when we first switch on our transceivers we make sure the power output is very very low, and then we transmit...If the SWR meter is reading for example1:10, we know that there must be a problem with the antenna...Either it has been blown over by winds or one of the leads going to the antenna from the transceiver has been disconnected, probably by winds...and of course we rectify the situation (y) :D.. [/QUOTE]
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