Topband: Key clicks

[w8ji at contesting.com (Tom Rauch)]

> The ARRL gives a "rule of thumb" in one of their handbooks that goes
> something like this:
>
> "The bandwidth of clean CW signal in Hertz is approximately twice the WPM
> rate."

The ARRL Handbook is quite lacking in its analysis of keyclicks and
descriptions of CW keying Earl. It is one of the worse areas of the
Handbook.

The **required** bandwidth is given by that formula, but that is not the
same as the occupied bandwidth. The occupied bandwidth is set by shape and
slope of the rise and fall and is absolutely independent of speed.

The **required** bandwidth changes with speed.

Speed does not change the **occupied** bandwidth.

73 Tom