We actually test at higher levels than this. The hardware AGC is *after* the crystal filter. Gain control prior to the filter is in discrete steps under control of the user: preamps and attenuator sections.
Wayne N6KR > On Jun 22, 2017, at 1:20 PM, Joe Subich, W4TV <li...@subich.com> wrote: > > > > Could you elaborate on "dynamic range" in crystal filters? > > All crystals have imperfections (flaws). Those flaws create distortion > when the crystal is driven with a high level signal and the distortion > (non-linear response) results in intermodulation distortion (IMD). > > The K3/K3S operates the crystal filter at a higher level than many other > receivers. Thus, testing the filters for linearity at the maximum > signal level (equivalent to S9 +40 dB - where the hardware AGC engages) > is important to assure the best possible performance over the entire > operating range of the K3/K3S. > > 73, > > ... Joe, W4TV > > > On 6/22/2017 3:12 PM, Bob wrote: >> Hi Wayne, >> Could you elaborate on "dynamic range" in crystal filters? A quick >> search did not yield a definition. A SWAG might be another term for >> ultimate rejection or it with ripple in the passband... >> Just curious. >> 73, >> Bob >> K2TK ex KN2TKR (1956) & K2TKR >> On 6/22/2017 12:54 PM, Wayne Burdick wrote: >>> Yes. We screen every INRAD filter. Those that don’t meet our dynamic range >>> targets are rejected. >>> >>> Wayne >>> N6KR >>> >>> >>>> On Jun 22, 2017, at 9:46 AM, Vic Rosenthal <k2vco....@gmail.com> wrote: >>>> >>>> I recall Wayne saying that Elecraft tested filters received from INRAD for >>>> some specific performance characteristics. I don't remember the details. >>>> >>>> Vic 4X6GP >>>> >>>>> On 22 Jun 2017, at 17:14, Clay Autery <caut...@montac.com> wrote: >>>>> >>>>> INRAD makes Elecraft's filters as I understand it... >>>>> >>>>> I'll be getting mine from Elecraft directly. >>>>> >>>>> ______________________ >>>>> Clay Autery, KY5G >> ______________________________________________________________ >> 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 li...@subich.com > ______________________________________________________________ > 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 n...@elecraft.com ______________________________________________________________ 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
