Re: PAR endz-fed
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I am using the 40m EndzFed at my QTH. It slopes from 10 ft outside my shack to 40 ft up into a redwood tree. I do not have a lot configuration for a decent 40M dipole. Although not recommended by PAR, I have worked stations on 60 and 80 meters with it using the K3 autotuner. I cannot compare the performance to other wires, however, the unit is well made and has survived two winters and summers fine. It worked well with my previous Yaesu rig, and seems to be fine with my new K3. No rare DX, but I can usually work 'em if I can hear them. Support is very good, questions answered quickly. Date: Sun, 1 Mar 2009 23:49:12 -0500 From: "Chuck Pridgen" <[hidden email]> Subject: [Elecraft] K1 ANTENNA To: <[hidden email]> Message-ID: <C32DC7C04B1A43879C15DC5CA56267AC@LENOVO03E76884> Content-Type: text/plain; charset="iso-8859-1" HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS WITH YOU K1 OR OTHER ELECRAFTS. I WOULD LIKE INPUT ON HOW THEY HAVE WORKED FOR YOU, AND HOW YOU HAVE MOUNTED THEM. I AM INTERESTED IN USING THEM AT THE BEACH THIS SUMMER. THANKS, CHUCK N4UED Randy Cook [hidden email] ______________________________________________________________ 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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I have used a PAR end fed with my K1 at the beach. I feed it at the top and
run it from the condo balcony down at a slope to somewhere I can tie it off where no one will run into it. It works very well - better than an Outback vertical attached to the balcony. So far, no one has complained and no one has tried to pull it down. The K1 auto tuner will tune it to other bands and it works but I am sure the efficiency is compromised. Buck k4ia In a message dated 3/2/2009 1:17:07 P.M. Eastern Standard Time, [hidden email] writes: I am using the 40m EndzFed at my QTH. It slopes from 10 ft outside my shack to 40 ft up into a redwood tree. I do not have a lot configuration for a decent 40M dipole. Although not recommended by PAR, I have worked stations on 60 and 80 meters with it using the K3 autotuner. I cannot compare the performance to other wires, however, the unit is well made and has survived two winters and summers fine. It worked well with my previous Yaesu rig, and seems to be fine with my new K3. No rare DX, but I can usually work 'em if I can hear them. Support is very good, questions answered quickly. Date: Sun, 1 Mar 2009 23:49:12 -0500 From: "Chuck Pridgen" <[hidden email]> Subject: [Elecraft] K1 ANTENNA To: <[hidden email]> Message-ID: <C32DC7C04B1A43879C15DC5CA56267AC@LENOVO03E76884> Content-Type: text/plain; charset="iso-8859-1" HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS WITH YOU K1 OR OTHER ELECRAFTS. I WOULD LIKE INPUT ON HOW THEY HAVE WORKED FOR YOU, AND HOW YOU HAVE MOUNTED THEM. I AM INTERESTED IN USING THEM AT THE BEACH THIS SUMMER. THANKS, CHUCK N4UED Randy Cook [hidden email] **************A Good Credit Score is 700 or Above. See yours in just 2 easy steps! (http://pr.atwola.com/promoclk/100126575x1219957551x1201325337/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID %3D62%26bcd%3DfebemailfooterNO62) ______________________________________________________________ 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 Randy Cook
I used a 10/20/40 last year at FD with good results. Usually "if I could hear 'em, I could work 'em" was true, with the QRP caveat. Top about 35ft. in the air, bottom just a few feet off the ground. This was before I had my K3, but used the T1 with my FT817 and even used it on six meters for a few contacts. Dale says do not use a tuner, but just couldn't let those Q's get away. I plan on taking it out for a spring checkup soon with the K3 and internal tuner.
If you are using a K1 just buy the three band model and it could be a fun summer holiday. cleve/W5CEM |
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In reply to this post by Randy Cook
Randy, I have experimented with 1/4 wave slopers here with good success.
Just wish the Par's would handle legal limit. 73 de KE4WY Jim -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Randy Cook Sent: Monday, March 02, 2009 1:16 PM To: [hidden email] Subject: Re: [Elecraft] PAR endz-fed I am using the 40m EndzFed at my QTH. It slopes from 10 ft outside my shack to 40 ft up into a redwood tree. I do not have a lot configuration for a decent 40M dipole. Although not recommended by PAR, I have worked stations on 60 and 80 meters with it using the K3 autotuner. I cannot compare the performance to other wires, however, the unit is well made and has survived two winters and summers fine. It worked well with my previous Yaesu rig, and seems to be fine with my new K3. No rare DX, but I can usually work 'em if I can hear them. Support is very good, questions answered quickly. Date: Sun, 1 Mar 2009 23:49:12 -0500 From: "Chuck Pridgen" <[hidden email]> Subject: [Elecraft] K1 ANTENNA To: <[hidden email]> Message-ID: <C32DC7C04B1A43879C15DC5CA56267AC@LENOVO03E76884> Content-Type: text/plain; charset="iso-8859-1" HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS WITH YOU K1 OR OTHER ELECRAFTS. I WOULD LIKE INPUT ON HOW THEY HAVE WORKED FOR YOU, AND HOW YOU HAVE MOUNTED THEM. I AM INTERESTED IN USING THEM AT THE BEACH THIS SUMMER. THANKS, CHUCK N4UED Randy Cook [hidden email] ______________________________________________________________ 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 ______________________________________________________________ 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 Randy Cook
Chuck
If your antenna is over salt water (even if that water in under the sand which is under your operating position) you are going to be a VERY happy ham. ANYTHING strung up of salt water will give absolutely fantastic results! Have fun with the PAR or anything else you use under those condx. Tom wb2qdg k2 1103 > > > > Date: Sun, 1 Mar 2009 23:49:12 -0500 > From: "Chuck Pridgen" <[hidden email]> > Subject: [Elecraft] K1 ANTENNA > To: <[hidden email]> > Message-ID: <C32DC7C04B1A43879C15DC5CA56267AC@LENOVO03E76884> > Content-Type: text/plain; charset="iso-8859-1" > > HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS WITH YOU K1 OR > OTHER ELECRAFTS. > > I WOULD LIKE INPUT ON HOW THEY HAVE WORKED FOR YOU, AND HOW YOU HAVE > MOUNTED THEM. > > I AM INTERESTED IN USING THEM AT THE BEACH THIS SUMMER. > > THANKS, CHUCK N4UED > > > > Randy Cook > [hidden email] > > > > > ______________________________________________________________ > 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 ______________________________________________________________ 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 Randy Cook
On Mon, 2 Mar 2009 10:16:27 -0800, Randy Cook wrote:
>HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS This is a VERY easy antenna to build. Why would anyone want to buy what they can build in an hour for a fraction of the cost? See http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf One half of the dipole is a quarter-wavelength of wire, connected to the center conductor of the coax feedline. One quarter-wave from the end where the wire is connected you add a ferrite choke that functions as an "end insulator" for the coax, which makes the section of the coax between the wire and the choke the other half of the dipole. You do NOT apply a velocity factor when determining the length of the coax between the wire and the choke. If you're running 100W or less, the choke can be as simple as 10 turns of the coax around two 2.4-inch o.d. toroids, #31 or #43! I used much bigger chokes to run 1.5kW. For 20W or less, a single toroid is plenty. 73, Jim Brown K9YC ______________________________________________________________ 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 W5CEM
And the K1 and KX1 tunes it on all bands! (of course with the built-in
tuners) 73 de John pa0wit -----Oorspronkelijk bericht----- Van: [hidden email] [mailto:[hidden email]] Namens W5CEM Verzonden: maandag 2 maart 2009 20:36 Aan: [hidden email] Onderwerp: Re: [Elecraft] PAR endz-fed I used a 10/20/40 last year at FD with good results. Usually "if I could hear 'em, I could work 'em" was true, with the QRP caveat. Top about 35ft. in the air, bottom just a few feet off the ground. This was before I had my K3, but used the T1 with my FT817 and even used it on six meters for a few contacts. Dale says do not use a tuner, but just couldn't let those Q's get away. I plan on taking it out for a spring checkup soon with the K3 and internal tuner. If you are using a K1 just buy the three band model and it could be a fun summer holiday. cleve/W5CEM -- View this message in context: http://n2.nabble.com/Re%3A-PAR-endz-fed-tp2410802p2411177.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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 ______________________________________________________________ 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 Jim Brown-10
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In reply to this post by Jim Brown-10
Hi, Jim. I had thought about that concept years ago when I was doing more casual QRP portable operation (camping, Flight of the Bumblebee-type stuff, etc), but I never tried it because I just assumed that the impedance at the end of a "dipole" (i.e., where the choke would be on the coax) was so high that you wouldn't get much decoupling at that point. Have you been able to verify that a simple choke really blocks the shield current there? Or am I misunderstanding something? 73, Dave AB7E Jim Brown wrote: > On Mon, 2 Mar 2009 10:16:27 -0800, Randy Cook wrote: > > >> HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS >> > > This is a VERY easy antenna to build. Why would anyone want to buy > what they can build in an hour for a fraction of the cost? See > > http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf > > One half of the dipole is a quarter-wavelength of wire, connected to > the center conductor of the coax feedline. One quarter-wave from the > end where the wire is connected you add a ferrite choke that > functions as an "end insulator" for the coax, which makes the > section of the coax between the wire and the choke the other half of > the dipole. You do NOT apply a velocity factor when determining the > length of the coax between the wire and the choke. > > If you're running 100W or less, the choke can be as simple as 10 > turns of the coax around two 2.4-inch o.d. toroids, #31 or #43! I > used much bigger chokes to run 1.5kW. For 20W or less, a single > toroid is plenty. > > 73, > > Jim Brown K9YC > > 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 AC7AC
For those that may be newer on the list that would like to see an
example of a good homebrew 1/2 wave end fed setup, here's a good one (with pictures and schematic) on the QRP ARCI site. It was posted by Steve Yates, AA5TB: http://www.qrparci.org/content/view/59/55/ I've used a slight variation of this, and it works quite well for me on 20 meters. For wire, I used a hunk of the nice and light 28 Ga. copper-coated steel wire that The Wireman sells. Note that you can also make this with a toroidal transformer instead of the solenoidal coil setup shown--saves a lot of space. I put mine inside an old plastic 35mm film container I had long ago tossed in a drawer. When my wife saw the finished item, she said she finally understood why I saved "junk" like that! 72, Dave - K7DAA ______________________________________________________________ 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 AC7AC
Ron,
A few quibbles with your analysis. First, the antenna that I have described is a simple half wave dipole, fed at a current maxima. The only tricky part is the power rating of the choke that serves as the end insulator. My choke is NOT a matching element, it an end insulator! Second, this antenna interacts with surrounding objects (including the earth) just as any dipole would if hung in the same position, NOT as a ground mounted vertical would. The major loss in a ground-mounted vertical is due to resistive losses due to return currents flowing in the lossy earth, which can be made very small by adding enough radials. In MY antenna, the return currents are entirely within the antenna. On Mon, 2 Mar 2009 14:20:33 -0800, Ron D'Eau Claire wrote: >The PAR End-Fedz (Par's spelling) is a Fuchs type antenna; an end fed 1/2 >wave radiator. >Its advantage over shorter radiators is that it requires very little ground, >if any, since it's fed at a voltage loop. Efficiency is not compromised by a >mediocre ground as is so common with radiators 1/4 wave or less in length >because virtually no current need flow into a ground system. >If it's mounted vertically it will still have the induced ground losses all >verticals have NO! Verticals have "ground losses" if the earth is what's carrying return current and terminating the field. In the antenna we're describing, the outside of the coax acts as the other half of the dipole, so it carries the return current and terminates the field! BUT -- for this antenna to work, the quarter-wave length of the feedline between the wire and the choke must be in the air (and the higher the better) -- that is, it is part of the antenna! This antenna can be vertical, horizontal, or sloping. It can even turn corners. If, for example, you were to toss it out the window of an upper floor and into a tree, it would act just like any other center fed dipole of the same length at the same height! Another point about "ground losses." The earth serves a second function with any antenna -- it acts as a reflector for the field that the antenna generates, and the interaction of the reflected field adds (algebraically) with the direct field to form the antenna's vertical pattern. The BEST that the reflection can do is add 6 dB at low angles. If the earth is lossy, the reflection is weaker, which makes the lower angle parts of the pattern weaker. 73, Jim Brown K9YC ______________________________________________________________ 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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Jim Brown wrote on Monday, March 02, 2009, at 11:09 PM:
> A few quibbles with your analysis. First, the antenna that I have > described is > a simple half wave dipole, fed at a current maxima. The only tricky part > is > the power rating of the choke that serves as the end insulator. My choke > is > NOT a matching element, it an end insulator! If a resonant trap is placed at the bottom end instead of a choke as an insulator, whose coil is the outer of a coiled length of the feeder, with the trap's capacitor connected to the outer of of the coax at each end of the coil of coax, the phase relationship between two driven vertical dipoles can be fine tweaked over a limited range. The scheme that you use also makes feeding a half-square at a top corner from the bottom practical, without a separate feeder going to a top corner which could distort the antenna's pattern. 73, Geoff GM4ESD ______________________________________________________________ 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 David Gilbert
>Have you been able to verify that a simple choke really blocks the
>shield current there? Yes, it works -- IF the choke has a sufficiently high impedance. >Or am I misunderstanding something? No. You can see another way to do this on N6LF's website. 73, Jim K9YC ______________________________________________________________ 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 Geoffrey Mackenzie-Kennedy
On Tue, 3 Mar 2009 00:15:04 -0000, Geoffrey Mackenzie-Kennedy wrote:
>If a resonant trap is placed at the bottom end instead of a choke as an >insulator, A coaxial choke wound on a ferrite core IS a parallel resonant circuit. Properly done, the choke should be wound to place the resonant frequency where the antenna will be operated! Study the references I cited in the earlier post. As to your other suggestions -- yes, this method of feeding opens up many interesting possibilities! 73, Jim K9YC ______________________________________________________________ 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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Jim Brown wrote on Tuesday, March 03, 2009 at 12:59 AM > A coaxial choke wound on a ferrite core IS a parallel resonant circuit. > Properly done, the choke should be wound to place the resonant frequency > where the antenna will be operated! Study the references I cited in the > earlier post. Yes, I take your point. It is the fine tweaking of phase that I find easier to do with a capacitor!! 73, Geoff GM4ESD ______________________________________________________________ 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 Jim Brown-10
Folks,
I fail to see the advantage of constructing an end fed dipole with coax for half of the antenna - it requires a choke that has a parallel resonant frequency equal to the operating frequency, and the overall length is a half wavelength. I believe it is much easier to construct a half wave radiating section and make up a parallel resonant circuit using discrete components - wind a wire around some kind of form (PVC, 35mm film container, etc) and tune it to resonance with a capacitor. The transition to 50 ohm coax can be either a link or a tap on the coil. YMMV. My preference for portable operation is a balanced dipole fed with 300 ohm ladder line. The radiator length is not critical - I use 44 feet (22 feet per side) for 40 thru 10m and carry clip-on extensions 22 feet long if I need to cover 80 meters. The feedline attached to the antenna is 25 feet long and I carry an additional 25 foot length of 300 ohm line if the 25 foot length is not sufficient to reach from the antenna to the transmitter. It can be strung as an inverted VEE when there is only one support (I use a 32 ft telescoping pole), or it can be a vertical - string it up alongside the fiberglass pole, or if two supports are available, it can be deployed as a horizontal dipole, or use it as a sloper - just get the wire in the air as high as possible using whatever works best. A switchable 1:1/4:1 balun at the transmitter end of the feedline completes the antenna - use whichever setting provides the best match to the auto-tuner, it will vary depending on the deployment method. There is no "magic" in antennas, the laws of physics cannot be defeated no matter what the antenna manufacturer's advertising hype may say. If you can mount the antenna in the clear and can feed power to it, it will radiate, and it need not be expensive - add up the cost of 44 feet of wire and 50 feet of 300 ohm feedline and compare the result to the price of a constructed (or kit) antenna. 73, Don W3FPR Jim Brown wrote: > On Tue, 3 Mar 2009 00:15:04 -0000, Geoffrey Mackenzie-Kennedy wrote: > > >> If a resonant trap is placed at the bottom end instead of a choke as an >> insulator, >> > > A coaxial choke wound on a ferrite core IS a parallel resonant circuit. > Properly done, the choke should be wound to place the resonant frequency > where the antenna will be operated! Study the references I cited in the > earlier post. > > As to your other suggestions -- yes, this method of feeding opens up many > interesting possibilities! > > 73, > > Jim K9YC > > > ______________________________________________________________ > 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 > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.0.237 / Virus Database: 270.11.5/1979 - Release Date: 03/01/09 17:46:00 > > 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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I think a dipole fed with balanced line is the best choice as a primary antenna, it works well on multiple bands with a good balanced tuner. Or even a dipole fed with coax, but then you are limited to a single band (unless you parallel multiple dipoles with a single feedline which works very well). My primary antenna is an 80 meter dipole fed with ladder line. But at the same time I have enough land to put up another antenna, but I would like to locate it at some distance from my primary antenna. For this reason an end fed half wave dipole as being described does seem to be interesting. It would be a single band resonant antenna that could conveniently located a fair distance from the shack. Anything can be made to radiate, many things are more efficient than others. I guess it all depends on what one has to work with. While some antennas may be considered to be optimal, getting up what ever one can and making contacts with it can be a lot of fun too. 73/72 - Mike WA8BXN ______________________________________________________________ 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 Don Wilhelm-4
On Mon, 02 Mar 2009 22:48:03 -0500, Don Wilhelm wrote:
>I fail to see the advantage of constructing an end fed dipole with coax >for half of the antenna The advantage is if it solves a particular rigging problem that you encounter. 73, Jim K9YC ______________________________________________________________ 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 Randy Cook
On Tue, 3 Mar 2009 07:28:12 -0500, Matt Palmer wrote:
>I've been thinking of building one of these to play with, do you have >any ideas on how to stress relieve the point where you solder the wire >to the coax? This seems to be the weak link in the chain. I use the inexpensive dipole insulator sold by The Wireman. It has the additional advantage of being weatherproof. 73, Jim K9YC ______________________________________________________________ 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 Geoffrey Mackenzie-Kennedy
On Tue, 3 Mar 2009 01:53:19 -0000, Geoffrey Mackenzie-Kennedy wrote:
>Yes, I take your point. It is the fine tweaking of phase that I find easier >to do with a capacitor!! Please tell me how you would do that with this antenna! :) The "tweaking" involved requires nothing more than looking at my measured data and winding the choke to put the resonance where you want it. It isn't very "tweaky" -- the Q of a choke like this is around 0.5. 73, Jim Brown K9YC ______________________________________________________________ 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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