Richard Fry wrote:

"Cecil Moore"

Still there are those nagging assertions of Born
and Wolf that for two equal magnitude signals,
the total intensity possible for incoherent
signals is double the intensity of one signal.
The total intensity possible for coherent
signals is four times the intensity of one signal.

________

It is a fairly common practice in broadcast designs to combine the
outputs of two r-f amplifiers of equal power rating, using a 4-port, 3
dB coaxial hybrid. The two amplifiers are driven by a single exciter
through a suitable splitter. The antenna connects to one output port of
the hybrid, and the other output port is connected to a dummy load.

When the relative r-f phases of the two txs are suitably set, the
antenna connection of the hybrid receives the total output power of the
two txs, and the dummy load port receives zero. When the relative r-f
phases of the txs are changed by 90 degrees from that setting, then the
conditions at the output ports are reversed.

The total average power available at the hybrid output for both of these
conditions is twice that of a single tx without the hybrid.

Does the quote from Born and Wolf support this?

RF

The quote from Born and Wolf that Cecil cites supports the 'profound'
notion that (E1 + E2)^2 / (E1 + E2) = 4.

73, Jim AC6XG