Stephen, The broadcast-band preselector components on the ATU option do in fact optimize receive performance in the 0.5-1.5 MHz range. However, the criteria being optimized by the preselector is rejection of harmonic images (typical of a zero-I.F. receiver), not necessarily sensitivity.
As I posted to the reflector in March of this year (and on other occasions), the KX3 includes a multi-pole high-pass characteristic within the T/R switch to attenuate mega-size BC band stations below 1.5 MHz that might affect RF switches and PIN diodes. This is also noted in the Specifications section of the manual, under "Sensitivity (MDS)". I see that the KX3 sales brochure isn't clear on this point, and I'll fix that. One thing I can do in firmware is allow the user to manually tune the ATU's LC network to peak a given AM-band signal. I'll eventually add this as an alternative to the "canned" preselector settings, which were based on a compromise antenna (50' center-fed random wire). 73, Wayne N6KR Stephen Prior wrote: > Hi Wayne > > > Have things changed then, since you wrote the following back last > October? > > > > "- switchable low-pass filter components that optimize receive > performance when you're listening in the AM broadcast band" > > > I'm just wondering, because I too enjoy a bit of medium wave late at > night when camping. It's no big deal of course! > > 73 Stephen G4SJP ______________________________________________________________ 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
