[Amps] coaxial stub on amplifier output

[Jim Brown]

On Sat, 03 Apr 2010 12:21:22 -0500, donroden at hiwaay.net wrote:

>Or would the "zero-ohm" load absorb most of the harmonic ?

Yes, the stub burns most of the harmonic power that hits it. While we talk 
about a "zero ohm load," it's really some fraction of an ohm depending on 
the loss in the coax used to make the stub, so the harmonic attenuation the 
stub provides is approximately equal to the ratio of the short circuit 
impedance of the stub to the impedance of the line at the point of 
connection (and at the frequency of the harmonic). The "approximately" comes 
from fact that the calculation is more complex than that, thanks to the 
reactive component of that line impedance. 

73,

Jim K9YC