How about putting a grounding lug on the chassis BNC? http://www.amphenolrf.com/031-10152-rfx.html <http://www.amphenolrf.com/031-10152-rfx.html>
wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Mar 29, 2016, at 8:28 AM, Bruce Nourish <[email protected]> wrote: > > I'm always terrified of losing the thumbscrew in the grass. I wish MFJ made > these with a built-in right angle and a binding post, or even just a bolt > and a wing nut, at the base. > > On Tue, Mar 29, 2016 at 8:21 AM Wayne Burdick <[email protected]> wrote: > >> Use one of the KX3's thumbscrews. We relieved the paint on the chassis at >> these points so you can use them for counterpoise wires or ground. >> >> Wayne >> N6KR >> >> >> On Mar 29, 2016, at 5:14 AM, "Barry N1EU [email protected] [KX3]" < >> [email protected]> wrote: >> >>> >>> Probably a dumb question, but any suggestions on how to connect >> counterpoise wires using the MFJ-1820T? The loaded whip terminates in a >> male BNC, which I assume is intended to connect directly to the KX3 antenna >> jack. It's not obvious to me how to add counterpoise wires??? >>> >>> Thanks & 73, >>> Barry N1EU >>> >>> On Wed, Mar 23, 2016 at 10:12 PM, Wayne Burdick <[email protected]> >> wrote: >>> Hi all, >>> >>> I've been using an MFJ-1820T telescoping 20-meter whip for a few months. >> Considering its length (48"), results have been excellent. I typically use >> it with the KX3 on a picnic table at 15 W (with an external battery), or >> hand-held at 3 to 5 W (internal battery). >>> >>> During the ARRL DX contest I worked many countries in CW and RTTY modes, >> and have also had a number of longer QSOs on 20-meter SSB. Of course at >> these power levels, with an electrically short whip, good band conditions >> can't hurt. >>> >>> I prefer a 25' or so wire-in-a-tree antenna when there's time. But when >> I need a quick deployment antenna that weighs very little, I pull out the >> 1820T. Note that you *must* use at least one counterpose wire. More than >> one helps, but all of the QSOs I described were made with a single 13'-long >> wire laid out on the ground. With no ground wire, you'll be down some 15 to >> 20 dB in transmit mode. >>> >>> Since the 20-meter results were so good, I also bought the whips for 40, >> 17, 15, and 10 meters. 40 meters is a rough ride at 48", but I was still >> able to check into daytime SSB nets all over the west coast running 10 W. >> On the higher bands, results improve as you go higher in frequency. I >> worked a few JAs on 15 meter SSB running just 1 watt. >>> >>> A traditional problem with such antennas is that the the SWR can >> sometimes be unexpectedly high, requiring that you micro-adjust the >> telescoping length and/or adjust the length of the counterpoise wire. This >> is completely unnecessary if you have an auto-tuner available. In >> particular, the KX3's ATU can quickly match any of these whips over their >> full target band. In a pinch the ATU can also match a given whip on >> adjacent bands. In the DX contest mentioned I tuned up the 20-meter whip on >> 17 and 15 meters as well, and made a few Q's there, despite the losses due >> to off-resonance operation. >>> >>> These whips can handle a surprising amount of power. They're rated to 25 >> W, but I ran 50 W through the 20-meter version for several minutes without >> damaging it. Some other compact whips I've tried overheated quickly even at >> 10 W, including some of the Maldol models. When this happens, the SWR goes >> up and stays up until the coil cools down. >>> >>> Caveat: Always use a full-size antenna when possible. But if you've just >> crested a new hill and only have a couple of minutes to see if the RF >> really is greener on the other side, this is an excellent choice. >>> >>> 73, >>> Wayne >>> N6KR >>> >>> >>> ______________________________________________________________ >>> 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] >>> >>> >>> __._,_.___ >>> Posted by: Barry N1EU <[email protected]> >>> Reply via web post • Reply to sender >> • Reply to group • >> Start a New Topic • Messages in this topic (2) >>> VISIT YOUR GROUP New Members 21 >>> • Privacy • Unsubscribe • Terms of Use >>> . >>> >>> >>> __,_._,___ >> >> ______________________________________________________________ >> 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]
