The RX ISO preamp draws a bit more current than the regular preamp, so it defaults to off to preserve battery life. As far as I know, that is the only negative.
KX3 models after the mid-2000 serial numbers also have a filter on the BNC to knock down some leakage in the VHF range. Mine has it — the tiniest toroid I’ve ever seen. Details about that upgrade for older KX3’s are here: http://www.elecraft.com/order_form_parts.htm#kx3 wunder K6WRU CM87wj http://observer.wunderwood.org/ On Feb 14, 2015, at 11:36 AM, David Orman <[email protected]> wrote: > Glad this thread popped up, noticed this earlier when out portable with a > friend (or rather, he noticed it); this setting fixed it entirely. I'll > keep it off unless needed as the manual seems to indicate that's the right > way to go. > > Thank you, > David > > On Sat, Feb 14, 2015 at 12:47 PM, Wayne Burdick <[email protected]> wrote: > >> Yes -- this should do the trick. >> >> Wayne >> N6KR >> >> >> On Feb 14, 2015, at 8:01 AM, Brian Waterworth <[email protected]> >> wrote: >> >>> Turn on menu item rx iso >>> >>> Regards >>> Brian >>> VE3IBW >>> On Feb 14, 2015 10:51 AM, "[email protected]" <[email protected]> wrote: >>> >>>> Is anyone else experiencing leakage from the VFO via the antenna? >>>> I had my FT-2000 on and could hear the KX3 VFO as I tuned near the KX3 >>>> operating frequency on the FT-2000. They were on separate antennas >> about >>>> 40 feet apart. Varying the KX3 tuning knob varied the signal on the >>>> FT-2000. >>>> >>>> Ron W7HD >>>> >>>> -- >>>> Sent with Postbox <http://www.getpostbox.com> >>>> ______________________________________________________________ >>>> 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] >> >> ______________________________________________________________ >> 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] ______________________________________________________________ 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]

