Paul wrote,

On Tue, 16 Mar 2004 12:51:06 GMT, James Meyer
wrote:

Errr... I read the thread. And in your first message you say. "All I
can get apart from the fundamental is a strong third harmonic on 10.32Mhz,
regardless of what I tune for. I've tried passing the osc output through two
successive inverter gates to sharpen it up, but still nothing beyond the
third
appears after tuned amplification for the fifth."

If I'm not mistaken, "tuned amplification" IS "filtering".

An argument over semantics, then. AFAIC it's not filtering as such.
It introduces a high degree of selectivity, certainly. But when
someone says "filtering" I assume they're taking about a pi-network or
something of that sort, between stages or at the end of a chain of
stages.
--


You need to read up on active filters, and when you've done that, you should
read a book on digital filtering.
73,
Tom Donaly, KA6RUH