Well, “advancing skills in both the communication and technical phases of the art” and all that. Funny how S2 noise was silent, even on a wilderness peak.
wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Oct 27, 2016, at 5:55 PM, Edward R Cole <[email protected]> wrote: > > Walter, > > Have to chuckle - "ask what one thought would be rhetorical question" and > some one gives you an answer! > > Well, if you can get away from modern civilization and run without ac power > low noise conditions can be found. > My KX3 is out mounted in my truck so don't have it to test. I did turn on my > K3 connected to triband yagi and am seeing S5 noise "floor" where there are > no signals (preamp off). Checking 6m I also see S5 but this is pointed at a > local noise source and with ext Gasfet preamp on. If I turn the 6-element > yagi 90-degrees the noise level drops to as low as S3 with preamp on (K3 > needs some kind of preamp when using 6m). I also have the PR6-10 which I use > on HF or 6m if I turn on DIGOUT-1 which energizes the PR6-10 and disconnects > the ext preamp. It shows about one s-unit lower noise due to less gain than > the Gasfet. > > But with "two bars" if you actually measured noise power it would probably > still be about -120 dBm or higher. Still on HF that is *quiet*. > > 73, Ed - KL7UW > > From: Walter Underwood <[email protected]> > To: [email protected] > Subject: Re: [Elecraft] [K3] The Way We Rank Receivers (long) > > > > On Oct 25, 2016, at 2:31 PM, Edward R Cole <[email protected]> wrote: > > > > I wonder where in the world one sees a 20m noise floor that low when > > antenna is connected? Only when I lived off the grid running on battery > > power did I see S0 noise on my radio (3.9-KHz with TS180S from a dipole). > > Good point. Looking at the photo of my KX3 on top of Mount Willson in Henry > Coe, I see two bars on the S-meter on 20 meters. That is miles from Silicon > Valley. It was quiet and lovely, I could hear everybody. The filters were > wide open, preamp on, and NR off. Zoom in and you can see for yourself. > > https://www.flickr.com/photos/walter_underwood/17417496311/in/album-72157652448882921/ > > <https://www.flickr.com/photos/walter_underwood/17417496311/in/album-72157652448882921/> > > wunder > K6WRU > Walter Underwood > CM87wj > http://observer.wunderwood.org/ (my blog) > > > > 73, Ed - KL7UW > http://www.kl7uw.com > "Kits made by KL7UW" > Dubus Mag business: > [email protected] > > ______________________________________________________________ > 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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
