On 10/09/2015 11:33, gareth wrote:
"rickman" wrote in message
...

I guess he is picturing the quanta as a pulse of a wave which it
*isn't*.

Consider a quiet band, and you receive a single dit, the letter E in Morse
Code.

Before there would have been no signal and neither after the dit.

So, if your RF photons do not have a beginning and an end, as they must do
as pulsed phenomenon, how come there is only signal during the duration of
the dit?

Because they carry on forever passing you and going out into space the
collective signal getting weaker and weaker according to the inverse
square law.
If our sun were to vanish suddenly the light it put out would still
carry on. We would be in darkness after about 8 minutes but someone near
Jupiter would still see it and someone in a different solar system would
still see the light after years.

Andy