Hi Eric, S9+65 dB is about -8 dBm. Off the top of my head, this is far, far below what a basic K4 or K4D can handle, artifact-free, in-band, without the need for attenuation or additional filtering. When I get back to the lab I'm going to set up exactly this condition and get back to you.
Of course the out-of-band rejection is even higher. A number of K4s will be used extensively during FD this year, including mine. I'll be taking advantage of the K4's low current drain (for its class) by running mine from a KX2 11 volt battery pack (3x 18650 cells). For at least an hour or so :) 73, Wayne N6KR > From: "Eric Norris" <norrislawfi...@gmail.com> > To: "elecraft@mailman qth. net" <elecraft@mailman.qth.net> > Sent: Tuesday, June 23, 2020 9:32:04 PM > Subject: [Elecraft] K4 Question > > My foaming at the mouth over the K4 has been tempered by it having less > adjacent channel rejection than the K3 due to the different > architecture--at least until the K4HD comes out. I understand this, and > the reasons why. Thanks for your answers > > I know I have asked this question before, but I want to be more specific. > My QRM neighbor is S9+65 db on my K3S S-meter. If he is blasting away on > ft8 at 7074 kHz at that signal level, how would the plain K4 receiver > perform at 7034 kHz on CW? Would there be AGC pumping, RX desense, or > other degradation, or would I be able to carry on a CW qso unmolested like > I can with my K3? What about an adjacent band like 3534 kHz or 10114 kHz? > Or is the answer I have to wait for the K4HD? > > No speculation, please, I'm looking for a real-world or lab-world answer. > > Thanks and, > > 73 Eric WD6DBM ______________________________________________________________ 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
