On Dec 23, 1:56*am, Jeff wrote:
For me a radio is a box with the knob to rotate.
Now at FM no brakes between stations. At AM are.

What was in 1915?
S*

In 1915 there were no broadcast stations to speak of so your dial
would be just one large "brake" (sic).

"Well, it's like this. The story starts in 1915, when mankind discovered
sidebands. Now possessing this superior understanding of the AM signal,
radio scientists began to understand the implications of their discovery.
Soon afterwards, our old friends at Bell Labs, who have discovered
practically everything, developed a method for removing one of the
sidebands
of an AM signal but retaining all the essential modulation components.
As an
expert of that day supposedly said, "both sidebands are saying the same
thing" (Goodman, 1948). " From:
http://www.hamradiomarket.com/articles/SSBHistory.htm

If in 1915 were no broadcast stations to speak tell us what was with the
first station to speak and when it start transmitting.
S*

The first AM Broadcast station (as opposed to amateur or military ) was
in about 1919.

Jeff

KCBS, San Francisco, claims to be the direct lineal descendant of
Charles Herrold's broadcasting, which dates from 1910. However,
Herrold's early work involved broadcasting to amateurs, by his own
admission. http://www.charlesherrold.org/KCBS.html, et al.

KCBS and KDKA, Pittsburgh, have been trading claims and counterclaims
for decades. KDKA went on the air in November, 1920 and supporters of
their claim of "First!" say KCBS doesn't date from the Herrold days,
but rather from 1921, when they got their earliest commercial license,
as KQW. I don't claim to be able to settle it here. Oy!

"Sal"