On Tue, 15 Sep 2015 18:51:31 -0400 Don Wilhelm <w3...@embarqmail.com> wrote:
> I am going to go off on a wild tangent as a method of testing all > receivers for the ability to copy signals in the midst of very crowded > band conditions and/or the presence of noise. Whether those receivers > have analog front ends or an ADC. > > An extremely crowded band could be simulated by broadband noise. > So take a medium strength single signal (say S-5) and inject it into the > receiver under test. > Now add a low amplitude broadband noise signal, and increase it until > the signal is buried in the broadband noise. > > The receiver that can withstand the greater broadband noise level while > still recognizing the single signal "wins". > That says nothing about the overload of the ADC for those receivers that > put the ADC at the antenna - that is something for other test parameters. > > 73, > Don W3FPR That sounds like a bias free test to me. It also raises a question. If the ADC performance can be so completely destroyed by overloading why would you put it at the antenna where it most likely could be overloaded? With regard to analog front ends, I used to think that antenna tuners were crutches for folk not capable of building resonant antenas. In fact they may serve as analog front ends. Of course they need to be in the signal path to serve on receive. Not all rigs include the ATU in the receiver signal path. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
