You need to take into account the radio finals. When the SWR is high, My KX3 cuts back because it gets too much reflected power. I expect the KX3, and in fact any other radio or amplifier is similar. 15:1 is about half the power coming back.
Regards, Mark W7MLG On Wed, Aug 7, 2019 at 5:14 PM David Gilbert <xda...@cis-broadband.com> wrote: > > Rather little of this discussion makes sense to me. > > Let's look at this realistically: > > 1. The antenna tuner in the KX2 is rated to be good up to 10:1 SWR. > Let's assume it's good to 15:1. > > 2. Let's assume you're using a decent cable for portable operation like > RG-8X. > > 3. Let's assume that the length of your coax when operating portable is > not much more than 30 feet long. > > 4. Let's assume under the current solar flux conditions you're spending > most of your time on 20m or lower in frequency. > > 30 feet of RG-8X has a loss of 0.4 db or less for that length at those > frequencies, and per the charts in the link below the additional loss > due to a 15:1 SWR is no more than 2 dB. > > http://www.astrosurf.com/luxorion/qsl-transmission-line2.htm > > Maybe it's just me, but I don't think that justifies dragging along a > remote tuner. You could recover a heck of a lot more dB by simply > bringing a somewhat larger portable antenna. > > 73, > Dave AB7E > > > > On 8/7/2019 3:57 PM, Phil Hystad via Elecraft wrote: > > Sounds like an idea worth trying — I have always wondered about the coax > loss between my KX3/KX2 and my portable antenna no matter which one it is > (i.e. AX-1, Wire and counterpoise wires, Buddipole, etc.). > > > > But, really glad I did not sell the T1 on several occasions of thinking > about selling it. I have not used my T1 since I sold my KX1 almost three > years ago. > > > > phil, K7PEH > > > >> On Aug 7, 2019, at 10:23 AM, Wayne Burdick <n...@elecraft.com> wrote: > >> > >> I think a T1 at the base would make a noticeable difference if the coax > were more than a few feet long and the whip's resonance well removed from > the target operating frequency. Short whips can be extremely narrow-banded. > >> > >> Wayne > >> > >> > >> > >> > >>> On Aug 7, 2019, at 7:40 AM, Don Wilhelm <donw...@embarqmail.com> > wrote: > >>> > >>> Bret, > >>> > >>> Yes, the T1 mounted at the antenna will reduce the potential loss in > the coax. > >>> > >>> Will you notice the difference? Maybe or maybe not. > >>> > >>> 73, > >>> Don W3FPR > >>> > >>> On 8/7/2019 7:54 AM, MaverickNH wrote: > >>>> It comes to mind I have an Elecraft T1 ATU I might try attaching > directly to > >>>> the base of the AX1 rather than relying on the KX2 ATU 25-40ft from > the > >>>> antenna. I try to operate closer but sometimes have to run that RG58 > to > >>>> clear obstructions. Thoughts? > >>> ______________________________________________________________ > >>> 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 n...@elecraft.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 phys...@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 xda...@cis-broadband.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 marklgoldb...@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
