I used to be a spec chaser but now I am a "feature appreciator" looking forward to K4! Bob K7VO
On Fri, May 28, 2021, 1:46 PM Ken Widelitz <kwidel...@gmail.com> wrote: > Hi Dave, > > I am remoting my VY2TT station. Unfortunately it didn't happen before the > Pandemic. For me, the most difficult challenge was remoting the panadapter. > K4 = problem solved. Anyone anywhere with a *tablet* and internet can have > a virtual K4 at their fingertips. As great a radio as it is, the K3s can't > do that. > > 73, Ken, K6LA / VY2TT > > On Fri, May 28, 2021 at 1:09 PM David Gilbert <ab7e...@gmail.com> wrote: > > > > > I have a K3 with the new synths and nothing in the Sherwood data or > > Wayne's post gives me any reason to switch to a K4, especially given the > > cost to do so. Bells and whistles are completely secondary for me > > compared with basic performance, and I still think that abandoning the > > K3s was a mistake. > > > > 73, > > Dave AB7E > > > > > > On 5/28/2021 10:55 AM, Paul GACEK via Elecraft wrote: > > > Congrats Wayne and team on the K4 evaluation. > > > > > > The two other responses do somewhat beg the question about what happens > > to the K3s used market and pricing. Not a lot of K3s for sale unlike the > > trickle to flood of k3. > > > > > > At one point, I thought people were hanging on to their K3s waiting for > > a K4 upgrade which might well still be valid but I also wonder if people > > will simply stay with the K3s as the performance is clearly great and > forgo > > the flexibility an SDR rig brings. > > > > > > Paul > > > W6PNG > > > www.nomadic.blog > > > > > >> On May 28, 2021, at 10:32 AM, Henry Pollock - K4TMC < > kilo4...@gmail.com> > > wrote: > > >> > > >> I Love my K3+(new syn)! > > >> > > >> 73, > > >> Henry - K4TMC > > >> (K3 #98) > > >> > > >>> On Fri, May 28, 2021 at 1:22 PM BRUCE WW8II <wa8...@gmail.com> > wrote: > > >>> > > >>> I LOVE my K3s > > >>> > > >>> Bruce > > >>> WW8II > > >>> > > >>>> On Fri, May 28, 2021 at 12:31 PM Wayne Burdick <n...@elecraft.com> > > wrote: > > >>>> > > >>>> Sherwood has posted his measurements of the K4D's receiver > > performance in > > >>>> his table: > > >>>> > > >>>> http://www.sherweng.com/table.html > > >>>> > > >>>> We're quite pleased with his test results, which confirm that the > > K4/K4D > > >>>> is near the top of its class (direct-sampling SDRs). A K4HD would > > provide > > >>>> somewhat higher dynamic range for those stations in extreme signal > > >>>> environments, but the vast majority of operators will find that the > > >>> K4/K4D > > >>>> more than meets their needs. > > >>>> > > >>>> I'd like to highlight a few important items in Rob's chart. > > >>>> > > >>>> First, the K4D has a high 2 and 20 kHz dynamic range value of 101 > dB. > > >>>> Because it's a direct-sampling radio, this figure will hold at > nearly > > all > > >>>> offsets from strong signals. Second is the block dynamic range > number > > >>> (128 > > >>>> dB), higher than almost every other "pure" SDR measured. Finally, > > there's > > >>>> the LO noise (local oscillator; 148 to 155 dB) -- again, very > > favorable > > >>>> compared to all competing SDRs. This is an important number > correlated > > >>> with > > >>>> reciprocal mixing dynamic range (RMDR). > > >>>> > > >>>> Taken together these demonstrate that the K4D will offer excellent > > >>>> performance in crowded band conditions. > > >>>> > > >>>> Inevitably a question will arise regarding the chart position of the > > K4D > > >>>> relative to a couple of our other transceivers: the K3S and KX3. > > There's > > >>> a > > >>>> bit of "apples to oranges" in both comparisons. > > >>>> > > >>>> The K3S uses a superhet receiver architecture. The K4HD will > provide a > > >>>> receive setting that emulates this superhet performance when and if > > it's > > >>>> needed. But the "pure" (direct sampling) method used by the K4 (all > > >>> models) > > >>>> has many advantages. One is the elimination of artifacts associated > > with > > >>>> crystal filters. Another is that, as a pure SDR, the K4 has a far > more > > >>>> flexible architecture. We'll be able to provide updates to the > receive > > >>> and > > >>>> transmit digital signal chains that cannot be added to a superhet > like > > >>> the > > >>>> K3S or its competitors. > > >>>> > > >>>> The KX3 is another Elecraft radio high on Sherwood's chart. Its > > >>>> performance is excellent, especially at its price point. But its > > numbers > > >>>> relative to the K4 are somewhat misleading, as hinted at by Rob's > > >>>> footnotes. The KX3 uses a quadrature downsampling architecture, > which > > >>>> digitally samples at baseband audio rather than at RF. This is ideal > > for > > >>> a > > >>>> radio like the KX3 that has to have very low current drain for > > portable > > >>>> operations. The K4 uses a direct-samping architecture that requires > a > > >>>> higher power digital signal chain, resulting in important benefits > > over > > >>>> quadrature downsampling including much higher and more consistent > > >>> opposite > > >>>> sideband image suppression and 2nd-order intermod rejection. So the > > two > > >>> are > > >>>> really designed for different applications. > > >>>> > > >>>> Overall, this first independent test of the K4 validates the > > performance > > >>>> of our SDR architecture. Feel free to send us any further > performance > > >>>> questions. > > >>>> > > >>>> 73, > > >>>> Wayne > > >>>> N6KR > > >>>> > > >>>> > > >>>> ______________________________________________________________ > > >>>> 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 wa8...@gmail.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 kilo4...@gmail.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 paul.ga...@mac.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 ab7e...@gmail.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 kwidel...@gmail.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 k7vora...@gmail.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
