On 12/30/2011 1:03 PM, Jim Brown wrote: > On 12/30/2011 4:51 AM, [email protected] wrote: >> Ok I admit I do not clearly understand this 30dB better dynamic range. > > In very simple terms, it means that when a very strong signal is very > close in frequency to another much weaker signal that you want to listen > to, the KX3 can reject a signal that is 30dB stronger than the 817 can > reject. Putting it another way, on the 817, the stronger signal would > take over, and you wouldn't hear the weaker one, but the KX3 would pull > it through.
OK ... yet another thing I've apparently forgotten or confused since college oh so many years ago. I thought [and thought I've always thought]: Dynamic Range: For a device, the difference between the peak level of *undistorted* output it will produce and the RMS value of the inherent noise within the device [i.e. zero input]. For an audio *signal* [like music in a concert hall], the difference between the lowest level and the highest peak level of the signal. Symphonic music has a very high dynamic range ... very quiet parts, very loud parts [think "1812 Festival Overture"]. Rap ... not so much. DR="one signal" Dynamic Blocking Range [sometimes Blocking Dynamic Range]: For some specified separation between a desired signal and an interfering signal, it's the difference between the level of the interfering signal and the level of the desired signal at the point where the interfering signal has produced some specified effect on the desired signal. DBR="two signals" If this is wrong, I'd sure like to get it right because I'd like to understand, "The KX3 will have about 30 dB better dynamic range than the IC-7000, even without the roofing filter." 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
