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IN A NUTSHELL: Frequency is sound,
One of the advantages of this powerful instrument is that those 180 antennas, which act together as one giant antenna or satellite dish, can be electronically (rather than manually) steered. This gets physicists like Fallen excited. He tells me: “So the beam can be focused in different directions very very quickly! And the beam can also be shaped differently. There’s all sorts of very creative experiment modes that stress the transmitter and cause pieces to burst into flames and arch and do other expensive damage to the machine.” Which was a concern for poor Fallen recently, as rookie operator in training.
originally posted by: BangoDukeINF
a reply to: Phage
This is a high power, high-frequency phased array RADIO TRANSMITTER with a set of 180 antennas
- Wikipedia
originally posted by: liejunkie01
I often wonder how much more we would know about the man if the politics of the day were different.
originally posted by: BangoDukeINF
Ya know, like when they used to use crystal rods in radios because they resonate at a frequency that the human ear cannot hear.
Yes, yes it is.
The main instrument at HAARP Station is the Ionospheric Research Instrument (IRI).
No. Crystals act as a rectifier in a crystal radio receiver (not transmitters). They do not "resonate", they permit electricity to flow in only one direction. They convert the modulated alternating electric field of electromagnetic radiation into an amplitude modulated direct current. The tranmsitter modulates its signal at audible frequencies (though they aren't audible because they are electromagnetic radiation, not sound) and the crystal rectifier extracts that modulated signal. There is no resonance involved in the process.
Ya know, like when they used to use crystal rods in radios because they resonate at a frequency that the human ear cannot hear.
The crystal does not resonate, the tuning coil does, but how else is the electrical signal going to get from the coil to the crystal rectifier if it isn't connected to it?
the crystal rod contacting the coil to resonate at the stations frequency.
A crystal radio has no preamp but I mean that the tuner in effect filters out all but the selected frequency, the station you want to hear. You could have a crystal radio without the tuner (with a large enough antenna) but you'd hear all of the radio stations at the same time. You would get a hiss of white noise.
2 you mean noise-gate which is built into the receiver preamp and has nothing to do with transmitting or receiving, it is signal processing.
I'm glad you read the link but the quote you provide just says that electromagnetic radiation travels a lot faster than sound, it says nothing about frequencies, inaudible or otherwise. A radio signal is modulated at audible frequencies. That modulation is superimposed on the carrier, at the frequency your radio station is assigned to.
Electromagnetic radiation carries sound waves at inaudible frequencies and that is even in the link you provided:
Right. Except that the crystal doesn't resonate and the "sound" is already at an audible frequency, the crystal extracts the modulated signal directly, it doesn't change it's frequency.
Let’s take your crystal radio and see if we can change it back into a sound that you can hear."