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

In rec.radio.amateur.antenna Radium wrote:
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?

The answer is not simple because any given photon only has one
frequency and one energy.

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.

Did you get tired of everyone calling you a clueless moron on sci.physics
and sci.physics.electromagnetics and think you would try here?

--
Jim Pennino

Remove .spam.sux to reply.

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.

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?

Go look at: http://www.fas.org/man/dod-101/navy/docs/es310/AM.htm

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.

In article ,
wrote:

Snip

Plonk

--
Telamon
Ventura, California

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.

In article . com,
Radium wrote:

Snip

Go away cross posting nut case.

Plonk

--
Telamon
Ventura, California

On Sun, 17 Jun 2007 15:19:59 -0700, Radium
wrote:

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?

That one is real simple:
2 photons (of appropriate amplitude, hence color) at most 3.333 (less
would be better, but not too much less) microseconds apart.

Feel free to desire more, but you asked for the minimum. If you want
more audio (sideband) content, that will certainly drive up the count
too.

Now, how's your quantum efficiency these days? (Use it to boost the
count higher.)

73's
Richard Clark, KB7QHC

In article . com,
Radium wrote:
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?


1. What is the energy of a photon at 150 kHz?

2. What is the minimum discernable signal in your receiving system?
(How much power is needed at the receiver to overcome the internal
noise of the receiver system and detect the signal?)

3. What signal to noise ratio makes for a tolerable listening condition?
(How much more power than quetion #2 is needed at the receiver to decode
the modulation and yield a usable signal?)

Mark Zenier
Googleproofaddress(account:mzenier provider:eskimo domain:com)

On Jun 18, 11:05 am, (Mark Zenier) wrote:

1. What is the energy of a photon at 150 kHz?

6.2 X 10^-10 eV