On Mon, Dec 1, 2008 at 8:38 PM, Joe Subich, W4TV <[EMAIL PROTECTED]> wrote:
> Of course, but there is still a finite range between the > two limits. The maximum instantaneous peak is driven by > the number and strength of incoming signals and the minimum > discernable signal level is defined not by processing gain > but by "sky noise." All the processing gain goes only so > far ... the limit is still well above the theoretical ability > to detect one signal in the absence of noise. Processing > gain may be of value at microwave frequencies with a quiet > sky but it is not going to help below 10 MHz with extreme > signals and high noise levels. > > 73, > > ... Joe, W4TV You are making the incorrect assumption that we have no control over the upper or lower limits. If band or sky noise is the limiting factor on the low end, then adding attenuation in front of the ADC to adjust for this has the benefit of increasing the high end limit also. This ideally has not changed the dynamic range, but only shifted the upper and lower limits. The Perseus or QS1R will easily outperform the K3 in the case of multiple strong signals in discerning a weak signal as you have described. This is WITHOUT AGC in front of the ADC. -- Phil Covington Software Radio Laboratory LLC Columbus, Ohio http://www.srl-llc.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
