RF Gain calibration has separate calibrations for main and sub. It's a DSP computation, and the K3 Utility has code that invokes these DSP computations in main and then sub The wizard has more pages if you have a sub installed
Dick, K6KR Sent from my iPhone On Jul 16, 2010, at 1:07 PM, "Joe Subich, W4TV" <[email protected]> wrote: > > Jim, > >> There's something different about the K3 Sub-RX, and the Roofing >> filters seem to fall apart below about -25dB. Makes a guy wonder >> what's going on! > > I would bet the subreceiver has excess gain in the IF and you're > seeing amplified IF noise (particularly since the bandwidth is > about 1 KHz). I don't see any way for the K3 Utility to calibrate > main/receiver gain separately (Dick?) but I'd suggest checking the > gain calibration of the subreceiver or measuring all of the filters > only in the main receiver. > > 73, > > ... Joe, W4TV > > On 7/16/2010 3:28 PM, Jim Brown wrote: >> On Fri, 16 Jul 2010 14:38:24 -0400, Guy Olinger K2AV wrote: >> >>> Each to his own, just don't start a ban the 250 campaign. >> >> Both you and Ed raise good points. No intent there -- I agree that >> the so-called 250 Hz filter is slightly more useful than the 400 >> Hz. My real objective is to get Inrad to clean up their act! BUT >> -- take a look at the data in this link. Lots of food for thought. >> There's something different about the K3 Sub-RX, and the Roofing >> filters seem to fall apart below about -25dB. Makes a guy wonder >> what's going on! >> >> http://audiosystemsgroup.com/K3FilterStudy-250HzRoof.pdf >> >> 73, Jim K9YC >> > > ______________________________________________________________ > 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
