Simple is good On Fri, Oct 11, 2019 at 07:07 Gwen Patton <[email protected]> wrote:
> I have a KX3 instead of a KX2, but I frequently go out in the field to play > radio at local parks and other scenic spots. I have a number of antennas, > but one of my favorites is one I built recently, a link dipole for 40, 30, > and 20. It's tuned for the CW portions of the bands, so it doesn't need > much tuning, but if I want to work phone I hit the internal tuner just to > tweak it a little bit. I suspend it on top of a 20-foot telescopic > fiberglass pole from SOTABeams, secured in a drive-on mount and held down > by one of the tires of my E-150 conversion van. I run it in inverted-V > configuration, using stakes or photographers' sandbags at the far ends if > the location doesn't like stakes. > > I didn't bother with baluns or anything. I just wired the coax to the > midpoint and trimmed it up that way using an analyzer. I get good results > with it on CW or phone, easily going from the Philadelphia suburbs to the > Michigan Upper Penninsula on 40m phone with 10 watts. If I find that I'm > getting stray RF, I have a big isolator choke I can run the line through > that clobbers it nicely. > > 73, > Gwen, NG3P > > On Fri, Oct 11, 2019 at 6:55 AM CUTTER DAVID via Elecraft < > [email protected]> wrote: > > > I'd like to suggest that one very good reason for using centre-fed and > > external matching unit is because the harmonic pickup from nearby > stations > > is much reduced compared to multi-band antennas. This is best > implemented > > when the antenna is as near perfectly balanced as possible to avoid > > feedline pickup. A *proper* choke to cancel out-of-balance currents > should > > be helpful in this regard. > > > > For single station field days, I've used the Spiderbeam 807 > off-centre-fed > > inverted V dipole on a f/g pole which is a fast way to get on air without > > an external matching unit to fiddle with. Common mode current is > virtually > > zero. It's a great solution for beginners reducing the fiddle factor, ie > > plug and play KISS. Less to carry out into the field as well. > > > > David G3UNA/G6CP > > ______________________________________________________________ > > 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] > > > > > -- > > -+-+-+-+- > Jenny Everywhere's Infinite: Quark Time > http://quarktime.net > ______________________________________________________________ > 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] > -- 72, Rich Hurd / WC3T / DMR: 3142737 Northampton County RACES, EPA-ARRL Public Information Officer for Scouting Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) Grid: *FN20is* ______________________________________________________________ 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]
