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

On Jun 17, 10:37 pm, Richard Clark wrote:
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?

I keep trying and trying to count the 150kc photons ^sec by scooping
them up on a wire and displaying them across a digital osillyscope.
but the instant they interact with the wire they are transformed into
electrons... And those, dibble dabble damned electrons go hide amongst
the other electrons on the surface of the conductor and mock me...
They keep printing, "Photon, photon, who's got the photon, nyaa, nyaa,
nya, nayaa, nyaaaaaaa" across the computer screen...
So I said to myself, 'I'll teach em' - and hooked up a diode and a
speaker to the end of the antenna wire and be damned if they hadn't
transformed into phonons... Now they were mocking me by chanting,
"Who let the dogs out, who, hoooooo..."
So, then I said, 'I'll teach ya', and I hooked up a transmitter to the
end of the wire with a SWR meter and pumped 150kc photons into the
wire... The SWR meter showed infinity to one, or was it one to
infinity, or was that, oh jeez, now I'm confused... *&^()$#@* SWR
meter lies!

I need a beer...

denny / k8do

Denny wrote:

...
I keep trying and trying to count the 150kc photons ^sec by scooping
them up on a wire and displaying them across a digital osillyscope.
...
denny / k8do

Denny:

That is just plain silly.

I use a paper coated with a photographic emulsion to record the photons
striking the light sensitive emulsion.

Only problem, background radiation fogs the film before recording the
photons--I am working on resolving that minor problem ...

Regards,
JS

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)

In article .com,
Denny wrote:

On Jun 17, 10:37 pm, Richard Clark wrote:
On Sun, 17 Jun 2007 15:19:59 -0700, Radium
wrote:

Snip

I need a beer...

Nope. You just need to be added to the kill file.

Cheers.

Plonk

--
Telamon
Ventura, California

On Jun 18, 10:53 pm, Telamon
wrote:
In article .com,



Denny wrote:
On Jun 17, 10:37 pm, Richard Clark wrote:
On Sun, 17 Jun 2007 15:19:59 -0700, Radium
wrote:

Snip

I need a beer...

Nope. You just need to be added to the kill file.

Cheers.

Plonk

--
Telamon
Ventura, California

Oh gawd, now my life is over....

denny / k8do

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

In article .com,
Denny wrote:

Snip

plonk

--
Telamon
Ventura, California

In rec.radio.amateur.antenna Denny wrote:
On Jun 18, 10:53 pm, Telamon
wrote:
In article .com,



Denny wrote:
On Jun 17, 10:37 pm, Richard Clark wrote:
On Sun, 17 Jun 2007 15:19:59 -0700, Radium
wrote:

Snip

I need a beer...

Nope. You just need to be added to the kill file.

Cheers.

Plonk

--
Telamon
Ventura, California

Oh gawd, now my life is over....

denny / k8do

Maybe not.

Let's see how many more times you are added to his killfile.

--
Jim Pennino

Remove .spam.sux to reply.

In article . com,
Radium wrote:
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


You didn't answer the other questions. How much power does a good radio
need to get a listenable signal?

Here's some numbers

input impedance 50 ohms
Noise Figure 5 db
Bandwidth 6 kHz
signal to noise ratio 40 dB

(This would be what some of the newsgroups listeners here would want if
they had one of their pretty damn good radios listening to a broadcast
station. Really picky ones would probably want a 8-15 kHz bandwidth
with a 60 dB s/N ratio).

There are equations out there that will give you how much power
you need for this signal...

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