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Hi all,
there is a plenty of schematic about End Fed Half Wave antenna, but all them are within the range 40-10 meter. Is there one of you who was able to run it with a KX1 in the range 80-20 meter? The idea of getting a wire hanged somewhere, without long radials if not a 2-3 meters counterpoise is very intriguing. BTW with the internal tuner, should KX1 be able to match it without another external tuner, just to make things simpler with few things to bring along? Ciao Sante ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Sante,
The KX1 antenna tuner has limited range due to its small size, so I would not expect it to tune an end-fed 40 meter dipole on 80 meters. In addition, a half size end fed dipole is no longer an end fed dipole, it is just a piece of wire. The "half wave" part says that is true. A 1/4 wave wire without any other component is only half of a half-wave dipole no matter where it is fed. What I would suggest instead is the so-called W3EDP antenna connected to the KX1 with no feedline. The radiator is 89 feet (27.13 meters) and the counterpoise for 3.5 MHz is 17 feet (5.18m). Take a look at http://www.zerobeat.net/g3ycc/w3edp.htm. On 80 meters, you may need the auxiliary (external) tuning circuit, but once you have tuned the external circuit inside any one band, you can use the KX1 internal tuner as you move around in the band. 73, Don W3FPR On 7/10/2011 5:21 PM, Sante - IK0HBN wrote: > Hi all, > there is a plenty of schematic about End Fed Half Wave antenna, but > all them are within the range 40-10 meter. Is there one of you who > was able to run it with a KX1 in the range 80-20 meter? The idea of > getting a wire hanged somewhere, without long radials if not a 2-3 > meters counterpoise is very intriguing. > BTW with the internal tuner, should KX1 be able to match it without > another external tuner, just to make things simpler with few things > to bring along? > Ciao > Sante > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Hi Don,
thanks for support, I'll try to guess how much inductance the coil of W3EDP is, so to use a smaller toroid instead of a more invasive and bigger 2 inches coil... Finally, all I need is (if possible) a single wire antenna for 80-20 meter range, so to not have to change wire every time I will change a band. Even with somewhat like a tuner could do fine, but also with something to check the SWR with KX1. I know the little jewelty shows the SWR, but only after having tuned a wire, so using an external tuner without SWR reading should be quite difficult to prune a tuner not having an istantaneus reading of what I am going to do. Thanks for now Ciao Sante At 00.08 11/07/2011, you wrote: > Sante, > >The KX1 antenna tuner has limited range due to its small size, so I >would not expect it to tune an end-fed 40 meter dipole on 80 meters. > >In addition, a half size end fed dipole is no longer an end fed >dipole, it is just a piece of wire. The "half wave" part says that >is true. A 1/4 wave wire without any other component is only half >of a half-wave dipole no matter where it is fed. > >What I would suggest instead is the so-called W3EDP antenna >connected to the KX1 with no feedline. The radiator is 89 feet >(27.13 meters) and the counterpoise for 3.5 MHz is 17 feet (5.18m). > >Take a look at http://www.zerobeat.net/g3ycc/w3edp.htm. On 80 >meters, you may need the auxiliary (external) tuning circuit, but >once you have tuned the external circuit inside any one band, you >can use the KX1 internal tuner as you move around in the band. > >73, >Don W3FPR > >On 7/10/2011 5:21 PM, Sante - IK0HBN wrote: >>Hi all, >>there is a plenty of schematic about End Fed Half Wave antenna, but >>all them are within the range 40-10 meter. Is there one of you who >>was able to run it with a KX1 in the range 80-20 meter? The idea of >>getting a wire hanged somewhere, without long radials if not a 2-3 >>meters counterpoise is very intriguing. >>BTW with the internal tuner, should KX1 be able to match it without >>another external tuner, just to make things simpler with few things >>to bring along? >>Ciao >>Sante ... [show rest of quote] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Sante,
I would suggest that you do a trial run with the antenna at home - use an antenna analyzer for this initial tuning. Once you have found the right L and C for resonance, remove the variable capacitor, measure it and substitute a fixed capacitor, there should be no need for further tuning of that circuit in the field. Once in the field, some small additional tuning may be required, but the internal tuner in the KX1 should take care of that. Take note that a reduced radiator length version of this antenna is shown on page 9 of the KXAT1 manual - with no external tuning unit. The W3EDP radiator wire is close to that 23 feet plus an added half wavelength on 40 meters, so for 40/30 and 20, this same length wire should behave about the same as the antenna lengths for which the KX1 tuner was optimized. 73, Don W3FPR On 7/11/2011 1:56 PM, Sante - IK0HBN wrote: > Hi Don, > thanks for support, > I'll try to guess how much inductance the coil of W3EDP is, so to use > a smaller toroid instead of a more invasive and bigger 2 inches coil... > > Finally, all I need is (if possible) a single wire antenna for 80-20 > meter range, so to not have to change wire every time I will change a > band. Even with somewhat like a tuner could do fine, but also with > something to check the SWR with KX1. > I know the little jewelty shows the SWR, but only after having tuned > a wire, so using an external tuner without SWR reading should be > quite difficult to prune a tuner not having an istantaneus reading of > what I am going to do. > Thanks for now > Ciao > Sante > > ... [show rest of quote] ______________________________________________________________
Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Sante - IK0HBN
I’ve posted this before, but maybe it bears repeating:
On my camping trips with the KX-1 (with autotuner) I have had very good results on all 4 bands with my simple wire antenna. I bought a 50 ft roll of stranded speaker wire at Radio Shack (I believe it was 16 or 18 ga, but I doubt that the thickness matters much). I un-zipped it to make two wires. Actual length turned out to be 51 ft 8 inches (thanks for being generous, RS!) but here, too, I doubt actual length is critical. One 50 ft wire lies on the ground. The other goes up as I high as I can get it using available supports. I’ve had it go up as a sloper to a tall tree or the light pole in a motel parking lot, or as an inverted L, and once as an inverted U over a large rock formation in AZ (admittedly, that one didn’t work terribly well). The tuner loads it up nicely and I’ve made lots of nice contacts with it. You may wish to try it. 73 Ray K2HYD KX-1 #608 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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