Re: [Elecraft] EFHW vs Off-Center Fed Dipole

alf Of David Gilbert Sent: Saturday, January 13, 2018 12:22 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW vs Off-Center Fed Dipole You can use whatever terms you want, but physically and electrically you are turning the EFHW into an off-center fed dipole when you add the "

Re: [Elecraft] EFHW vs Off-Center Fed Dipole

, using "smart phone". 73, Bill K9YEQ -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Gilbert Sent: Saturday, January 13, 2018 12:22 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW vs Off-Center

Re: [Elecraft] EFHW vs Off-Center Fed Dipole

You can use whatever terms you want, but physically and electrically you are turning the EFHW into an off-center fed dipole when you add the "counterpoise" wire beyond the feedpoint.  If you don't agree with that you are merely adding to the confusion. If you add 3.5 feet to a half wave 40

Re: [Elecraft] EFHW

Thanks Ed! It was a great show for us this year and we enjoyed talking with everyone. Eric /elecraft.com/ On 2/14/2017 2:50 PM, Edward Kacura wrote: It was nice to see you again Eric, and enjoyed your presentation again in Orlando ! Look for Elecraft there next year !! 73 de Ed N7EDK Sent

Re: [Elecraft] EFHW

It was nice to see you again Eric, and enjoyed your presentation again in Orlando ! Look for Elecraft there next year !! 73 de Ed N7EDK Sent from my iPhone > On Feb 13, 2017, at 21:23, Eric Swartz - WA6HHQ, Elecraft > wrote: > > Folks, I just returned from 5 days on the

Re: [Elecraft] EFHW

Thank you Eric! Let's keep the talk to Elecraft products! Ray, N6VR On Mon, Feb 13, 2017 at 7:23 PM, Eric Swartz - WA6HHQ, Elecraft < e...@elecraft.com> wrote: > Folks, I just returned from 5 days on the road for the Orlando Hamcation > hamfest and saw this huge thread. As per list

Re: [Elecraft] EFHW

Folks, I just returned from 5 days on the road for the Orlando Hamcation hamfest and saw this huge thread. As per list guidelines, please self moderate (i.e. - End) OT threads like this after 5-10 posts. Please do not wait for me to jump in. Lets end the thread at this time - this topic has

Re: [Elecraft] EFHW

ft-boun...@mailman.qth.net] On Behalf Of Jim > Brown > Sent: Sunday, February 12, 2017 5:31 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] EFHW > > Not true, Ron. Most AM broadcast transmitting antennas are in the range of > 80-90 electrical degrees (a quarte

Re: [Elecraft] EFHW

1530KHz is about 200m wavelength so 2 half waves in phase would be about 200m tall, approx 650' Fred Jensen wrote: > Well, the KFBK Franklin is two vertical 180 deg co-linear elements center > fed [in-phase, I think], so I guess it would be about 1,600 ft [almost 500 >

[Elecraft] EFHW

: [Elecraft] EFHW Message-ID: <1853009709.471103.1487014955949.javamail.r...@starpower.net> Content-Type: text/plain; charset=utf-8 Hi Fred, When I started DXing in about 1962, Solar Cycle 19 was quite weak and reached its minimum in 1964, the year I made

Re: [Elecraft] EFHW

un...@mailman.qth.net] On Behalf Of Fred > Jensen > Sent: Saturday, February 11, 2017 2:40 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] EFHW > > Ummm ... A full-wavelength wire is not resonant? > > 73, > > Fred ["Skip"] K6DGW > Sparks NV DM09

Re: [Elecraft] EFHW

I will also testify that this antenna has worked well for us. My son above, NS0R, has used it in favor of a beam because of a tower HOA issue with his wife. LOL. Both of us have literally worked thousands of QSO with this antenna. The Parallel tuner will handle most any HIGH impedance antenna,

Re: [Elecraft] EFHW

- From: "Fred Jensen" <k6...@foothill.net> To: elecraft@mailman.qth.net Sent: Monday, February 13, 2017 7:33:11 PM Subject: Re: [Elecraft] EFHW In the 1960's, you could work the world with 20 watts to a window screen. Peak of Cycle 19 was in the front half of the 60's. [:-) 7

Re: [Elecraft] EFHW

In the 1960's, you could work the world with 20 watts to a window screen. Peak of Cycle 19 was in the front half of the 60's. [:-) 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 2/13/2017 9:41 AM, donov...@starpower.net wrote: I used a 20 meter "Happy Accident Ground Plane"

Re: [Elecraft] EFHW

Well, the KFBK Franklin is two vertical 180 deg co-linear elements center fed [in-phase, I think], so I guess it would be about 1,600 ft [almost 500 m]. A couple of the TV towers in Walnut Grove down in the Delta are 2,000 ft [600 m], but they're not center fed. [:-) I think most "half-wave"

Re: [Elecraft] EFHW

t;Don Wilhelm" <donw...@embarqmail.com <mailto:donw...@embarqmail.com>> > To: "Wes Stewart" <wes_n...@triconet.org <mailto:wes_n...@triconet.org>>, > elecraft@mailman.qth.net <mailto:elecraft@mailman.qth.net> > Sent: Sunday, February 12, 2017

Re: [Elecraft] EFHW

--- Original Message - From: "Wes Stewart" <wes_n...@triconet.org> To: elecraft@mailman.qth.net Sent: Monday, February 13, 2017 6:43:29 AM Subject: Re: [Elecraft] EFHW >From the WWV site: The WWV antennas are half-wave vertical antennas that radiate omnidirectional pat

Re: [Elecraft] EFHW

be too much extra weight for a portable set-up. 73, Charlie k3ICH -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Morgan Bailey, II Sent: Monday, February 13, 2017 10:32 AM To: Elecraft Reflector <elecraft@mailman.qth.net> Subject: [Elecraft

[Elecraft] EFHW

I can vouch for the EFHW. It works great. I built a parallel tuned circuit using a roller inductor and a 15-350pf cap. I have used this several times on 20 meters feeding a 33.5 foot vertical wire. I use about 4 10 foot radials, which is probably overkill, and run it through a good choke and

Re: [Elecraft] EFHW

On the low bands most end fed half waves are inverted L's or fairly close and for very good reason. That's due to the kind of support people commonly have for an 80 meter wire that's a total of 135 feet long. Most commonly, a pair of trees, a horizontal wire between them, and at one end of it

Re: [Elecraft] EFHW

From the WWV site: The WWV antennas are half-wave vertical antennas that radiate omnidirectional patterns. There are actually five antennas at the station site, one for each frequency. Each antenna is connected to a single transmitter using a rigid coaxial line, and the site is designed so

Re: [Elecraft] EFHW

; > From: donov...@starpower.net<mailto:donov...@starpower.net> > Sent: Sunday, February 12, 2017 9:07 PM > To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net> > Subject: Re: [Elecraft] EFHW > > There are excellent photos and a description of the KFBK Franklin array

Re: [Elecraft] EFHW

th.net<mailto:elecraft@mailman.qth.net> Subject: Re: [Elecraft] EFHW There are excellent photos and a description of the KFBK Franklin array here: https://www.fybush.com/sites/2005/site-051028.html 73 Frank W3LPL - Original Message - From: "Fred Jensen" <k6...@foothill.net>

Re: [Elecraft] EFHW

13, 2017 3:56:33 AM Subject: Re: [Elecraft] EFHW KFBK in Sacramento uses [or used, my info is a few years old] a center-fed half-wave vertical ["Franklin"] antenna, said to be the only one left. It's ... interesting. [:-) KFBK is also the originator of the first out-phasing BC TX which

Re: [Elecraft] EFHW

alf Of Jim Brown Sent: Sunday, February 12, 2017 5:31 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW Not true, Ron. Most AM broadcast transmitting antennas are in the range of 80-90 electrical degrees (a quarter wave). Nearly all of the Class I clear channel stations us

Re: [Elecraft] EFHW

KFBK in Sacramento uses [or used, my info is a few years old] a center-fed half-wave vertical ["Franklin"] antenna, said to be the only one left. It's ... interesting. [:-) KFBK is also the originator of the first out-phasing BC TX which became the RCA Ampliphase [or Amplifuzz if you ever

Re: [Elecraft] EFHW

Not true, Ron. Most AM broadcast transmitting antennas are in the range of 80-90 electrical degrees (a quarter wave). Nearly all of the Class I clear channel stations use antennas that are at least 180 electrical degrees. You can see this data for any US station at

Re: [Elecraft] EFHW

This thread is a long one and frankly I didn't follow it at first, but a little research says that the OP was interested in bringing a coax feeder directly into the radio from the end of a wire. He incorrectly called the coax a "counterpoise", instead of an extension of the wire which it

Re: [Elecraft] EFHW

On Sat,2/11/2017 9:19 PM, Kevin - K4VD wrote: ​So what we are saying here is that all the local and DX QSOs we make from a picnic bench with an end fed or random wire thrown up in a tree and a short or no counterpoise doesn't really happen or, at best, is a fluke. Not at all -- but the fact is

Re: [Elecraft] EFHW

" if the radio is on the ground, or near the ground, then the antenna is a vertical." Wes N7WS Does this statement actually mean that horizontally polarized antennas do not exist for those, whose radio is not high enough above the ground. :) 73, Igor UA9CDC

Re: [Elecraft] EFHW

I think what this thread is about is effective, very lightweight antennas for backpacking, SOTA, bicycle touring, etc. These are antennas that, not including the support, weigh just a few ounces. Whether they could be made to work better with hundreds of long radials is completely irrelevant.

Re: [Elecraft] EFHW

How about "All the local and DX QSOs with a random wire were not made with and end fed HALF-WAVE." On 2/11/2017 9:19 PM, Kevin - K4VD wrote: So what we are saying here is that all the local and DX QSOs we make from a picnic bench with an end fed or random wire thrown up in a tree and a short

Re: [Elecraft] EFHW

Don, As I said earlier in this thread, if the radio is on the ground, or near the ground, then the antenna is a vertical. I don't care what the slope is, it has a vertical component. A Beverage is a horizontal wire, but it is vertically polarized and works against ground. It may be lousy

Re: [Elecraft] EFHW

ay, February 12, 2017 6:29:07 PM Subject: Re: [Elecraft] EFHW Wes, I do not doubt what you are saying about 1/2 wave verticals, but most EFHW antennas are mounted as a sloper or a horizontal antenna. For portable operation, the main concern is for the ability to feed the antenna, and no

Re: [Elecraft] EFHW

Wes, I do not doubt what you are saying about 1/2 wave verticals, but most EFHW antennas are mounted as a sloper or a horizontal antenna. For portable operation, the main concern is for the ability to feed the antenna, and not about maximizing the far field strength. 73, Don W3FPR On

Re: [Elecraft] EFHW

Alas, if only this was true. Google "radial system design and efficiency in hf verticals" and you should get a cached version of Rudy Severns' paper of the same name. In it he states: "Alternately we can graph efficiency in terms of Ga as shown in figures 3 and 4. Unfortunately this also

Re: [Elecraft] EFHW

-boun...@mailman.qth.net] On Behalf Of Rick Dettinger Sent: Saturday, February 11, 2017 9:54 PM To: Kevin - K4VD Cc: Elecraft Reflector Reflector Subject: Re: [Elecraft] EFHW 10% efficient is for a “short” end fed antenna and a ground rod or similar. Something near a quarter wave and a typical one

Re: [Elecraft] EFHW

On Sat, Feb 11, 2017 at 11:19 PM, Kevin - K4VD wrote: > ...The end fed is only 10% efficient (did I get that right)... == No, that's not right. The radiation pattern and gain of an end-fed halfwave are little different from a center-fed dipole. The efficiency of an

Re: [Elecraft] EFHW

I'd have to total it up, but I probably made close to 1,000 contacts with an EFHW and KX1 last year. The whole antenna system, including the 38 foot fishing pole and tuner, weighs about 1.5 pounds. Of course, it doesn't work as well as a high, full-sized antenna, but if anyone can come up

Re: [Elecraft] EFHW

On Sat,2/11/2017 9:52 PM, Wes Stewart wrote: However, I submit that you (and I) would have more fun with better antennas. Absolutely! I had fun as a kid with antennas at about 25 ft in the maple trees at the front and back of our lot. I had fun with dipoles strung between telephone pole in

Re: [Elecraft] EFHW

enna, the slope puts that lobe at a fairly low angle relative to the >> earth. >> >> 73, Ron AC7AC >> >> -Original Message- >> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes >> Stewart >> Sent: Saturday, Fe

Re: [Elecraft] EFHW

I'm pretty sure the laws of physics are still in place. What you describe isn't much different from my situation on 160 meters. I have an inverted vee dipole with the apex at 45' and the ends at 6 feet or less. With 500W I have worked about 60 counties. But I am under no illusions that

Re: [Elecraft] EFHW

A certain inductance places at a correct place along the 80m HW will make multy band EFHW. Here is the example http://myantennas.com/wp/product/efhw-8010p/ 73, Igor UA9CDC 12.02.2017 1:50, K9MA пишет: On 2/11/2017 13:03, Brian Pietrzyk wrote: Now comes the fantasy thinking... What about

Re: [Elecraft] EFHW

- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes > Stewart > Sent: Saturday, February 11, 2017 8:02 PM > Cc: elecraft@mailman.qth.net > Subject: Re: [Elecraft] EFHW > > It is with some reluctance that I smack this whole EFHW tarbaby, but here

Re: [Elecraft] EFHW

lobe at a fairly low angle relative to the earth. 73, Ron AC7AC -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes Stewart Sent: Saturday, February 11, 2017 8:02 PM Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW It is with some rel

Re: [Elecraft] EFHW

Message- From: Elecraft [mailto:-boun...@mailman.qth.net] On Behalf Of Fred Jensen Sent: Saturday, February 11, 2017 2:40 PM To:elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW Ummm ... A full-wavelength wire is not resonant? 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County ---

Re: [Elecraft] EFHW

No, end fed halfwaves are not dipoles. They are monopoles. Take a look at the ARRL antenna book, LaPort, Johnson or any of the classic antenna books. There is a reason why all the AM broadcast Stations with halfwave end fed antennas have radial systems that consist of 120 radials that are 0.4

Re: [Elecraft] EFHW

@mailman.qth.net Subject: Re: [Elecraft] EFHW The next time I experiment with end fed antennas, I want to try a matching transformer at the end of the antenna wire of about a 50:1 matching ratio. That way I will have an impedance in the feed line of about 50 ohms and minimize coax loss. Now if I am

Re: [Elecraft] EFHW

You're close, Bill. The short counterpoise should go at the antenna end of the feedline by the transformer, not at the radio. It probably won't make much difference, though, as the outside of the coax will serve as a counterpoise. Depending on the design of the transformer, its inductance

Re: [Elecraft] EFHW

aving only one voltage node is a mono(single)pole. 73, Ron AC7AC -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Walter Underwood Sent: Saturday, February 11, 2017 2:20 PM To: Elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW A dipole has tw

Re: [Elecraft] EFHW

The next time I experiment with end fed antennas, I want to try a matching transformer at the end of the antenna wire of about a 50:1 matching ratio. That way I will have an impedance in the feed line of about 50 ohms and minimize coax loss. Now if I am connecting the antenna directly to

Re: [Elecraft] EFHW

On Sat, Feb 11, 2017 at 3:46 PM, Don Wilhelm wrote: A halfwave dipole is a halfwave dipole whether fed at the center or at an > end or somewhere in between. > The radiation pattern and efficiency is the same. > This is 100% correct. Two minutes spent with

Re: [Elecraft] EFHW

A dipole has two elements. An end-fed half-wave is a monopole. One element. A half-wave antenna is still a half-wave, whether it is center fed (Hertz) or end fed (Marconi). wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Feb 11, 2017, at 1:46 PM, Don Wilhelm

Re: [Elecraft] EFHW

Walt, Which LNR End-Fedz are you using that has a trap. I have never seen one with a trap. On 2/11/2017 4:22 PM, Walter Underwood wrote: The LNR End-Fedz antennas use traps. They appear to work just fine. __ Elecraft mailing list

Re: [Elecraft] EFHW

Ray, I think that is 'stretching' the facts a bit. A halfwave dipole is a halfwave dipole whether fed at the center or at an end or somewhere in between. The radiation pattern and efficiency is the same. The problem is that an end fed resonant dipole does need a little bit of a counterpoise

Re: [Elecraft] EFHW

AC7AC -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes N7WS Sent: Saturday, February 11, 2017 12:44 PM To: Charlie T, K3ICH Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW jX = 0 Sent from my iPhone > On Feb 11, 2017, at 1:29 PM, Char

Re: [Elecraft] EFHW

Correct. Fan dipoles work because the resonant 1/4-wave elements are lower impedance than the non-resonant elements, so they get the majority of the power. A neat trick, really. The LNR End-Fedz antennas use traps. They appear to work just fine. wunder K6WRU Walter Underwood CM87wj

Re: [Elecraft] EFHW

DGW Sparks NV DM09dn Washoe County -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lynn W. Taylor, WB6UUT Sent: Friday, February 10, 2017 12:13 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW Just a reminder, folks. If it's not a

[Elecraft] EFHW

As was said previously, all end fed antennas are monopoles with displacement current flowing from the antenna element to earth. Unlike dipoles where the displacement currents flow from element to element. So without an adequate radial system to reduce the ground loss all end Feds regardless of

Re: [Elecraft] EFHW

On 2/11/2017 13:03, Brian Pietrzyk wrote: Now comes the fantasy thinking... What about making it an end fed multi band by either putting traps in the 80m end fed or better still adding on a couple of fan EFHW wires for 40 and 20? Anyone tried this? How would the efficiencies compare to their

Re: [Elecraft] EFHW

> Sent: Saturday, February 11, 2017 2:40 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] EFHW > > Ummm ... A full-wavelength wire is not resonant? > > 73, > > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County >> -Original Message-

Re: [Elecraft] EFHW

Define "resonance". Chas -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred Jensen Sent: Saturday, February 11, 2017 2:40 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW Ummm ... A full-wavelength wire is not resonant?

Re: [Elecraft] EFHW

ed trap or fan dipole counterparts > respectively? > > Then there is that 160m antenna I'm think about putting up this summer... > > Brian ve3bwp > > Date: Fri, 10 Feb 2017 12:05:56 -0600 > From: K9MA <k...@sdellington.us> > To: elecraft@mailman.qth.net > Subjec

Re: [Elecraft] EFHW

an.qth.net Subject: Re: [Elecraft] EFHW Just a reminder, folks. If it's not a half-wave, then it's a non-resonant wire. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfa

Re: [Elecraft] EFHW

: Fri, 10 Feb 2017 12:05:56 -0600 From: K9MA <k...@sdellington.us> To: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW Message-ID: <bf058500-e443-0a91-c789-06f1abd23...@sdellington.us> Content-Type: text/plain; charset=windows-1252; format=flowed Here's the old trade-off betwe

Re: [Elecraft] EFHW

the short vertical with a trailing wire and working SSB on 20 and 17. God bless the KX2! -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lynn W. Taylor, WB6UUT Sent: Friday, February 10, 2017 12:13 PM To: elecraft@mailman.qth.net Subject: R

Re: [Elecraft] EFHW

What I'd do if I was carrying it all on my back is take about 3 different lengths of wire with banana plugs on end, and banana jacks on the other. Use one as a counterpoise if needed. Use one or two as the radiator, depending on how well it tunes. You won't be using a resonant antenna

Re: [Elecraft] EFHW

Just a reminder, folks. An End-Fed Half-Wave is a 1/2 wave antenna on the frequency of operation. If it's not a half-wave, then it's a non-resonant wire. Elecraft tuners do a great job tuning non-resonant wires. They won't tune an End-Fed Half-Wave without some help, like a 9:1 un-un. So,

Re: [Elecraft] EFHW

On occasion I've run into RF in my KX3 when using a coax to feed random length antenna. The symptom was that the radio wouldn't transmit with anything other than trivial power, even though the tuner matched easily. A quick choke wound out of the coax helped a little, but the Elecraft BL2 stopped

Re: [Elecraft] EFHW

Here's the old trade-off between radiating efficiency and ease of matching for an end fed wire. The EFHW is more efficient, because little power goes into the ground system, but its high impedance is harder to match. A wire of a different length may be easier to match, but more power goes

Re: [Elecraft] EFHW

Brian, If your end fed antenna is actually a halfwave (which is what EFHW means), the answer is no. The solution for portable work is to use a length that is not a halfwave - 58 feet is known to work well for 40 thru 10 meters when used with a 13 foot counterpoise. Double the lengths if

Re: [Elecraft] EFHW

near the beach. I'll be trying Phone and psk31/JT65/CW an afternoon or two that week. Anyone interested in a sked email me direct. Brian ve3bwp Date: Wed, 8 Feb 2017 16:33:25 -0700 From: Doug Person <d...@k0dxv.com> To: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW Mess

Re: [Elecraft] EFHW

I wanted to thank everyone who commented on this thread. I felt an obligation to wrap it up since I ‘poked the hornet’s nest’ :)) I did get some good information and some interesting comments. It’s always fascinating to see how things morph from the original post.One thing I did realize is that

Re: [Elecraft] EFHW

​Thanks Scott. I use the Par EndFedZ EF-10/20/40 and EF-20/40 depending on what's in the bag at the moment. These are resonant and I'm assuming the KX3 tuner is enough to keep the SWR low. The radio always seems happy. I will add up to 8 feet of wire next time out and try some A/B tests. During

Re: [Elecraft] EFHW

George, KJ6VU, is a principle in the Pack-Tenna venture and a good friend. I don't have one but I've seen it. It's a fairly slick package for field work and it does not need an ATU which might put another 0.1 watt into the radiation resistance instead of heat in the ATU. 73, Fred ["Skip"]

Re: [Elecraft] EFHW

PackTenna has a end fed half wave antenna with a 50:1 transformer called the PackTenna Mini: "This compact wire antenna is ideal for SOTA activations, camping, backpacking, and travel. The PackTenna Mini End-Fed Half Wave Antenna combines a 50:1 UNUN, winder and

Re: [Elecraft] EFHW

On 2/9/2017 16:28, Kevin - K4VD wrote: I work portable with about 1 ft of coax to my end-fed. Never really had a problem making contacts. Guess I could do a lot better with a longer coax or with a counterpoise? Kev - K4VD It wouldn't hurt to add a counterpoise of 6-8 feet, just a single wire

Re: [Elecraft] EFHW

On 2/9/2017 16:22, Doug Person wrote: I am feeding my end-feds with over 100 feet of coax and they work just fine. Doug - K0DXV If they are end-fed half wave multiples without matching at the feedpoints, there has to be a lot of loss in the coax. Even if there are 9:1 transformers at the

Re: [Elecraft] EFHW

uary 9, 2017 2:22 PM Subject: Re: [Elecraft] EFHW I am feeding my end-feds with over 100 feet of coax and they work just fine. Doug - K0DXV On 2/9/2017 1:21 PM, K9MA wrote: > Well said, Bill! > > 73, > > Scott  K9MA > > On 2/9/2017 10:39, Bill Leonard N0CU wrote: >>

Re: [Elecraft] EFHW

I work portable with about 1 ft of coax to my end-fed. Never really had a problem making contacts. Guess I could do a lot better with a longer coax or with a counterpoise? Kev - K4VD On Thu, Feb 9, 2017 at 5:22 PM, Doug Person wrote: > I am feeding my end-feds with over 100

Re: [Elecraft] EFHW

I am feeding my end-feds with over 100 feet of coax and they work just fine. Doug - K0DXV On 2/9/2017 1:21 PM, K9MA wrote: Well said, Bill! 73, Scott K9MA On 2/9/2017 10:39, Bill Leonard N0CU wrote: The reason your antenna was a lot less finicky with a bit of coax is that the EFHW

Re: [Elecraft] EFHW

Well said, Bill! 73, Scott K9MA On 2/9/2017 10:39, Bill Leonard N0CU wrote: The reason your antenna was a lot less finicky with a bit of coax is that the EFHW antenna requires a return path for the RF field. Theoretically, without a return path, the antenna won't radiate at all. The

Re: [Elecraft] EFHW

Here I am using one with a 19ft wire: (It might take a while for the video to upload, check later if not there yet) https://www.youtube.com/watch?v=8_Axs2ut7sE Gil. Chip Stratton wrote: > No need to spend much money on an end-fed half-wave antenna. The EARCHI > matchbox design is cheap if you

Re: [Elecraft] EFHW

The reason your antenna was a lot less finicky with a bit of coax is that the EFHW antenna requires a return path for the RF field. Theoretically, without a return path, the antenna won't radiate at all. The recommended setup for this antenna is for a .05 wavelength counterpoised to be used. EZNEC

Re: [Elecraft] EFHW

No need to spend much money on an end-fed half-wave antenna. The EARCHI matchbox design is cheap if you do it yourself, and reasonable if you buy the kit or pre-built from them. If you want it to be a true half-wave, choose the wire length accordingly.

Re: [Elecraft] EFHW

ent: Wednesday, February 8, 2017 5:27 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] EFHW The classic way to feed a EFHW is to use a tuned tank circuit. The top of it goes to the antenna and the bottom goes to a short counterpoise or the coax shield. You can either tap the coil X turns from the bottom

Re: [Elecraft] EFHW

The classic way to feed a EFHW is to use a tuned tank circuit. The top of it goes to the antenna and the bottom goes to a short counterpoise or the coax shield. You can either tap the coil X turns from the bottom to match 50 ohms or use a link coupling with the appropriate number of turns. I

Re: [Elecraft] EFHW clarification

Guess I missed that in your post, sorry. Any conductor of any length will radiate, resonant or not ... provided you can get your TX to feed power into it. In all cases, the far end of the conductor is an open circuit [High E, low I, High Z] The impedance at the feed end will be a complex

Re: [Elecraft] EFHW clarification

The low current in the counterpoise or ground system is the main advantage of an EFHW over a random wire. (A random wire "close" to a half wave will have a similar radiation pattern, but much higher ground system current.) The feedpoint impedance of the EFHW can be 1500 to 5000 Ohms. With a

Re: [Elecraft] EFHW

Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dan Presley Sent: Wednesday, February 8, 2017 2:42 PM To: K2 Subject: [Elecraft] EFHW Wanted to get some thoughts from folks about pros and cons of an end fed half wave for portable/SOTA use, as opposed

Re: [Elecraft] EFHW clarification

t: Wednesday, February 8, 2017 4:14 PM Subject: [Elecraft] EFHW clarification Thanks for the replies so far. Just to clarify-I plan to use the built in auto tuners in my KX2 and 3, so hopefully they can handle the job. I already have a good 9:1 transformer which should work. The prim

[Elecraft] EFHW clarification

Thanks for the replies so far. Just to clarify-I plan to use the built in auto tuners in my KX2 and 3, so hopefully they can handle the job. I already have a good 9:1 transformer which should work. The primary question is the advantage to the EFHW as opposed to a true random length (not a

Re: [Elecraft] EFHW

I have two EFHW antennas. One covering 40 and 20; the other 17. They are mounted at about 40 feet and perform equal to regular dipoles. Feeding them is therefore much simpler for portable ops since only one side needs to be elevated. For portable use I feed them with about 20 feet of RG/58a,

Re: [Elecraft] EFHW

Two distinct advantages of the EFHW: It's high feedpoint impedance means a minimal counterpoise is required and very little power is wasted into the ground system. Second, the high current part of the wire, which does most of the radiating, is a quarter wave from the feedpoint, which can

Re: [Elecraft] EFHW

I suspect you're going to get a lot of opinions on your question [end-fed half waves], and a lot more on subjects well removed from your questions ... such is the behavior of lists. [:-) Any half-wave wire fed at the end will present a very high impedance [multiple K-ohms] and will require

[Elecraft] EFHW

Wanted to get some thoughts from folks about pros and cons of an end fed half wave for portable/SOTA use, as opposed to just using a random length wire with a counterpoise connected directly to either the KX2 or 3.(I think Eric recommended somewhere around 28’ depending on the band coverage).Is

Re: [Elecraft] EFHW (was Small QRP antenna)

On Fri,12/30/2016 6:02 AM, Michael Babineau wrote: Anyone interested in EFHW antennas should read Steve, AA5TB’s excellent website Here's another great way to end feed a half wave that Steve didn't think of. It originated with an idea that N6LF published. http://k9yc.com/VerticalDipole.pdf

[Elecraft] EFHW (was Small QRP antenna)

Anyone interested in EFHW antennas should read Steve, AA5TB’s excellent website. http://www.aa5tb.com/efha.html Some of the currently available EFHW tuners (QRPGuys& QRPkits SOTA ) use the tapped inductor approach, but I much prefer Steve’s idea of using a transformer. The advantage is that it