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Minimum photons-per-second [amplitude] required for 150 KHz?
On Jun 17, 4:38 pm, "Mike Kaliski" wrote:
300,000 photons per second should do the trick, as that is the frequency of the original signal and each photon can represent the amplitude of each half of a single sine wave. So the amount of photons-per-second should be double the frequency of the carrier-wave? In my first post of the thread, I stated that the carrier frequency for the AM signal is 150 KHz. Each photon in that signal is 150 KHz. It's possible to have one 150 KHz photon, right? My question was relating the modulator wave. If I have using 150 KHz photons for my carrier-wave on AM radio, what is the minimum amount of photons-per-second I would require to transmit, a modulator-signal [through the 150 KHz carrier-signal] of 20 KHz? I am guessing 40,000 150-KHz-photons-per-seconds. Am I right? |
Minimum photons-per-second [amplitude] required for 150 KHz?
"Radium" wrote in message ups.com... On Jun 17, 4:38 pm, "Mike Kaliski" wrote: 300,000 photons per second should do the trick, as that is the frequency of the original signal and each photon can represent the amplitude of each half of a single sine wave. So the amount of photons-per-second should be double the frequency of the carrier-wave? In my first post of the thread, I stated that the carrier frequency for the AM signal is 150 KHz. Each photon in that signal is 150 KHz. It's possible to have one 150 KHz photon, right? My question was relating the modulator wave. If I have using 150 KHz photons for my carrier-wave on AM radio, what is the minimum amount of photons-per-second I would require to transmit, a modulator-signal [through the 150 KHz carrier-signal] of 20 KHz? I am guessing 40,000 150-KHz-photons-per-seconds. Am I right? Radium You can have a single photon oscillating at a frequency of 150,000 cycles per second. Measuring that photon will give you a sample of 1/150,000th of a second duration. If you want to do anything meaningful, you need to have a whole lot more photons. If you modulate a 150kHz carrier with a signal of 20kHz then the bandwidth of the signal will extend from 150 kHz -20 kHz to 150 kHz +20 kHz or from 130-170 kHz. Signals centred on 150 kHz represent just the carrier wave. Signals at 130 kHz and 170 kHz represent 100% modulation of the carrier wave. Now the modulation of the carrier wave is symmetrical about the center frequency, so you only need to measure one half. One way of recovering the signal is to measure the frequency of each photon between 130 and 150 kHz at a rate of 300,000 samples per second. The variation of each photon from the carrier frequency represents the modulation. A 20 kHz signal can be accurately represented using 40,000 samples, but this is different from detecting modulation on a higher frequency carrier wave. Mike G0ULI |
Minimum photons-per-second [amplitude] required for 150 KHz?
In rec.radio.amateur.antenna Radium wrote:
On Jun 17, 4:38 pm, "Mike Kaliski" wrote: 300,000 photons per second should do the trick, as that is the frequency of the original signal and each photon can represent the amplitude of each half of a single sine wave. So the amount of photons-per-second should be double the frequency of the carrier-wave? In my first post of the thread, I stated that the carrier frequency for the AM signal is 150 KHz. Each photon in that signal is 150 KHz. It's possible to have one 150 KHz photon, right? My question was relating the modulator wave. If I have using 150 KHz photons for my carrier-wave on AM radio, what is the minimum amount of photons-per-second I would require to transmit, a modulator-signal [through the 150 KHz carrier-signal] of 20 KHz? I am guessing 40,000 150-KHz-photons-per-seconds. Am I right? No. For AM with a 150 Khz carrier and a steady 20 Khz tone, you have to emit 1 130 Khz photon, 2 150 Khz photons, and 1 170 Khz photon approximately every 12 microseconds. -- Jim Pennino Remove .spam.sux to reply. |
Minimum photons-per-second [amplitude] required for 150 KHz?
wrote in message ... In rec.radio.amateur.antenna Radium wrote: On Jun 17, 4:38 pm, "Mike Kaliski" wrote: 300,000 photons per second should do the trick, as that is the frequency of the original signal and each photon can represent the amplitude of each half of a single sine wave. So the amount of photons-per-second should be double the frequency of the carrier-wave? In my first post of the thread, I stated that the carrier frequency for the AM signal is 150 KHz. Each photon in that signal is 150 KHz. It's possible to have one 150 KHz photon, right? My question was relating the modulator wave. If I have using 150 KHz photons for my carrier-wave on AM radio, what is the minimum amount of photons-per-second I would require to transmit, a modulator-signal [through the 150 KHz carrier-signal] of 20 KHz? I am guessing 40,000 150-KHz-photons-per-seconds. Am I right? No. For AM with a 150 Khz carrier and a steady 20 Khz tone, you have to emit 1 130 Khz photon, 2 150 Khz photons, and 1 170 Khz photon approximately every 12 microseconds. -- Jim Pennino Remove .spam.sux to reply. Nicely put Jim. Mike G0ULI |
Minimum photons-per-second [amplitude] required for 150 KHz?
In article . com,
Radium wrote: Snip Go away cross posting nut case. Plonk -- Telamon Ventura, California |
Minimum photons-per-second [amplitude] required for 150 KHz?
In article ,
"Mike Kaliski" wrote: Snip Plonk -- Telamon Ventura, California |
Minimum photons-per-second [amplitude] required for 150 KHz?
In article ,
wrote: Snip Plonk -- Telamon Ventura, California |
Minimum photons-per-second [amplitude] required for 150 KHz?
Telamon wrote:
In article , "Mike Kaliski" wrote: Ohh gawd, bizarre telemundo is back ... PLONKERS! JS |
Minimum photons-per-second [amplitude] required for 150 KHz?
On Jun 17, 3:56 pm, "Dave" wrote:
"Radium" wrote in message ups.com... Hi: What is the minimum amount of photons-per-second needed for a 150 KHz AM radio carrier wave to transmit audio signals? Around 20,000-photons- per-second? Thanks, Radium you should have stayed with the alt.sci or sci.physics groups, you don't know what you are getting your self in for here! as in 'go fish' ~ RHF |
Minimum photons-per-second [amplitude] required for 150 KHz?
On Jun 17, 4:45 pm, wrote:
In rec.radio.amateur.antenna Radium wrote: On Jun 17, 4:05 pm, wrote: So at any given time, you need some number of photons at different frequencies to get the frequency components and some number of photons at each frequency component to the the amplitude components of the total signal. Well, in FM the peak-to-peak amplitude remains constant but the energy [frequency] varies. In AM, the frequency remains constant but the peak to peak amplitude varies. You've never seen what an AM signal looks like on a spectrum analyzer, have you? Scroll down to "A More Realistic Spectrum" - Go look at:http://www.fas.org/man/dod-101/navy/docs/es310/AM.htm Check-out the two side-by-side Images Hot flash for you, the AM modulation process creates other frequencies. If you only have one frequency, you don't have modulation of any kind. -- Jim Pennino Remove .spam.sux to reply. |
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