On 10 Nov 2005 12:15:10 -0800, "bpnjensen"
wrote:

It's very important to point out that 2 different frequencies, when
mixed in a perfectly linear device, will not beat.

OK, I'll bite - why is this important in a world of radios that operate
on the heterodyne basis? And what makes a linear device different?
Are any commonly used radios linear devices?

Seriously!

Non-electronics guy Bruce Jensen

An RF Preamp and Active Antenna electronics are 2 places where you
have a need for a linear active device.