On Sat, 13 Mar 2004 11:50:13 +0000, Paul Burridge
wrote:

On Sat, 13 Mar 2004 10:00:52 +1000, Tony wrote:

The 5th harmonic should be only 14dB below the fundamental, although it will
drop fairly quickly as the sides of the input square wave deviate from vertical.

Does the 3.44MHz have a 50% duty cycle?

Not quite, no. Why would that make any difference?

As the duty cycle deviates from 50%, the even harmonics start to
appear, so you need a better filter to keep them out.

John