Hi Wes, The difference is that we can go to as low as 200 Hz for our first IF filter ahead of the 2nd mixer, limiting what it sees for strong off frequency signals. The 7600 can only get down to 3 kHz (measured by Sherwood closer to 5 kHz) before its 2nd mixer, which is as wide as a barn door with respect to interfering signals. The closer to the front end of a radio you can get your narrowest filter, the better your overall strong signal dynamic range.
73, Eric WA6HHQ Elecraft Wes Stewart wrote: > First let me say that I once owned and Icom IC-211. It was such a POS > (using solder bridges between IC pins instead of circuit traces for example) > that I gave it to a friend who also had one. I often said that it was a > measure of his character that he accepted the "gift" and we still remained > friends. So I am no friend of, or apologist for Icom. > > That said, why would the second mixer in the Icom be any more susceptible to > overload than the second mixer in the K3? (Disregard the other evidence that > the Icom 3 KHz filter isn't really 3 KHz.) > > Wes N7WS > > --- On Tue, 6/16/09, Eric Swartz - WA6HHQ, Elecraft <[email protected]> wrote: > > From: Eric Swartz - WA6HHQ, Elecraft <[email protected]> > Subject: Re: [Elecraft] K3 vs. Icom IC-7600 > To: "HowardZ" <[email protected]> > Cc: [email protected] > Date: Tuesday, June 16, 2009, 10:27 AM > > Unlikely since thy use a high first IF with their narrowest roofing > filter at 3 kHz. signals inside that filter will overload the first > mixer and subsequent stages, well before any later crystal or DSP > filtering can do any good. > > 73, Eric WA6HHQ > > > HowardZ wrote: > >> Universal radio lists the radio as having >> "104dB dynamic range and +30dbm 3rd order intercept point ". >> >> Maybe it will soon make the top of Sherwood's list. >> >> However, I do not see any mention of "diversity receive". >> >> > ______________________________________________________________ > 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 > > > > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
