[Elecraft] K3 APF Adjustable Q

[Jim Brown]

On 10/31/2010 11:44 AM, Kok Chen wrote:
> The same SNR argument applies to how noisy his local RF environment is
> compared to your environment

This is often the dominant factor.  When I lived in a Chicago 
residential neighborhood, my S-meter rarely got below S7 on band noise 
with narrow CW filters.  Here in the Santa Cruz Mountains, it's often 
more like S3.  If you assume 4 dB per S-unit (typical for most radios), 
that's 16 dB. That means if the other guy has that S7 noise level, I've 
got to run 1,000 watts to be heard as well as I would hear 25 watts from 
him.

73, Jim K9YC