"JIMMIE" wrote in message
...
On May 8, 4:51 am, Szczepan Bia³ek wrote:
It seems that at long distances should appear the phenomenon of frequency
doubling.
See:http://www.rp-photonics.com/frequency_doubling.html

Is such?
S*

no distance required, and no antenna required, just put the signal through a
diode or other non-linear element and you will get some component at double
the frequency.