Re: [Elecraft] Balun Designs 1:1 FCP Isolation Transformer - SOLD

The Balun is sold. Jim Bennett Folsom, CA K7TXA (ex W6JHB as of 1/22/2021) Being retired doesn't mean I'm not part of the work force - just that I'm not forced to work! > On Jan 30, 2021, at 11:12 AM, James Bennett via Elecraft > wrote: > > Continuing my downsizing in preparation for a m

Re: [Elecraft] Balun Designs Model 4114T Current Balun 5K SOLD

The balun has been sold - thanks for your interest! > On Jan 2, 2021, at 1:13 PM, James Bennett via Elecraft > wrote: > > Doing some major antenna work here. For the past 10 years I’ve been using a > 92 foot long doublet, up 45 feet, fed with home brew 600-ohm ladder line. > From the back of

Re: [Elecraft] Balun BL2

as a balun, transformer or whatever. 73, Ron AC7AC -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Walter Underwood Sent: Thursday, May 26, 2016 8:46 PM To: Elecraft List Subject: Re: [Elecraft] Balun BL2 You might look at the “QRP” baluns from

Re: [Elecraft] Balun BL2

How hot it gets is determined by 1) the SWR and 2) the configuration of the antenna/feedline -- how much common mode power it has to dissipate. I have a DX Engineering balun rated 5 kW continuous and 10 kW intermittent which /overheated/ on some bands when running 1 kW -- until I added capacit

Re: [Elecraft] Balun BL2

You might look at the “QRP” baluns from Balun Designs. They are designed for 250 W and cost about $50. Excellent design and construction. http://www.balundesigns.com/low-power-qrp-baluns/ wunder K6WRU Walter Underwood CM87wj http://observer.wu

[Elecraft] Balun BL2

Hi Jerry, I've used the BL2 extensively, especially on my trips to E51. I've fed all sorts of SWR-unknown antennas with it, running the pile-ups with my K3 at 100w. On some antennas, it does get quite warm, but I keep it absolutely cool by running a small 12V computer muffin fan alongside i

[Elecraft] Balun BL2

Hello, I'm contemplating buying the BL2 balun. It would be connected to 450-ohm transmission-line, which would go to a version of W1AB's "killer-antenna", sized for 20m on a 31' jackite-pole. A reviewer of the BL2, on eham five years ago, commented about heat and signal-loss. The heat and si

Re: [Elecraft] Balun Questions

On Tue,2/9/2016 11:46 AM, Dave Cole wrote: Hi Jim, I have been reading about your exploits with THHN, and the 100 to 50 ohm change caused by the insulation... Note that my observations are confirming results published several decades ago by Jerry Sevick, W2FMI. My observations of Zo and Vf ar

Re: [Elecraft] Balun Questions

Thank you Bob... -- 73's, and thanks, Dave For software/hardware reviews see: http://www.nk7z.net For MixW support see: https://groups.yahoo.com/neo/groups/mixw/info For SSTV help see: http://groups.yahoo.com/neo/groups/MM-SSTV/info On Tue, 2016-02-09 at 14:28 -0600, Bob McGraw K4TAX wrote:

Re: [Elecraft] Balun suggestions

N7WS) Sent: Thursday, February 4, 2016 4:18 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Balun suggestions I just pinched myself; I'm not dreaming and it's not April 1st, so I guess you're serious. You are also so wrong on so many points, I'm not going to waste tim

Re: [Elecraft] Balun suggestions

get into details on or off the reflector. 73, Ron AC7AC -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes (N7WS) Sent: Thursday, February 4, 2016 4:18 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Balun suggestions I just pinched myse

Re: [Elecraft] Balun Questions

Yes, insulation does in effect cause the electrical length to change. Case and point, construct a 1/2 wave antenna using insulated wire, put it up and determine the resonant frequency or point where the SWR is 1:1. Then take it down, carefully strip off the insulation and put it back in the

Re: [Elecraft] Balun Questions

Hi Jim, I have been reading about your exploits with THHN, and the 100 to 50 ohm change caused by the insulation...  I am going to pick some up today and wind a choke using it, (as opposed to enameled 14 GA copper), to see just how close to 50 ohms it will come...  Any last minute tips?  BTW, th

Re: [Elecraft] Balun Questions

I have addressed this by showing photographs of winding techniques for coax normally used for transmitting, and for short lengths of transmission line formed by taping together a pair of 4-6 ft of #12 THHN. There's also text that goes with it, noting that winding radius should follow mfr recomm

Re: [Elecraft] Balun Questions.

Hi Dave G0WBX, I used to deal with some of those prior to retirement, worked in a broadcast shop for about 40 years...  What a difference digital has made to TV broadcast! :) -- 73's, and thanks, Dave For software/hardware reviews see: http://www.nk7z.net For MixW support see: https://groups.yah

Re: [Elecraft] Balun Questions.

On 09/02/16 17:15, elecraft-requ...@mailman.qth.net wrote: > If you lose, it is never good when the center conductor shorts to the >shield at Kilowatt power levels. Use loops large enough to stay within >the bending radius of your coax. Now if this is QRP, you could >probably get away with it

Re: [Elecraft] Balun Questions

If one has heating issues to that magnitude, they have other more critical issues which should be addressed. Bob, K4TAX Sent from my iPhone > On Feb 9, 2016, at 9:24 AM, Dave Cole wrote: > > Hello Bob, > > The coax could be exposed to heat when in service as a balun, so I > would respectfu

Re: [Elecraft] Balun Questions

Hello Bob, The coax could be exposed to heat when in service as a balun, so I would respectfully disagree with you on this one point. If you exceed the bending radius of your coax, you stand a higher percentage chance of causing a shield to center connector short, (due to center conductor migrati

Re: [Elecraft] Balun Questions

Hi Bob McGraw, I agree, except on one point: I’s say 90%, rather than 75%, of the stuff we use and methods employed would put most of the station stuff in the trash. 73, Bob Nobis - N7RJN n7...@nobis.net > On Feb 9, 2016, at 08:01, Bob McGraw K4TAX wrote: > > I'm one of the other Bob's or

Re: [Elecraft] Balun Questions

I'm one of the other Bob's or Robert's Since the assembly of coax wound around a toroid doughnut style bobbin is typically not exposed to vibration, such as might exist in an airplane, boat or space vehicle, the use of a solid conductor coax such as RG-303 would not seem to be of conce

Re: [Elecraft] Balun Questions

Hi Bob, et al, Thank you all for your careful attention. I read it wrong, as several have pointed out overnight. I transposed that to a percentage in my memory after reading it. One of the reasons for referring people to the original material in these cases. Someone will get it right. That makes

Re: [Elecraft] Balun Questions

On Mon,2/8/2016 2:52 PM, Mel Farrer via Elecraft wrote: Let's do some basic thinking. Mel, You need to study my tutorial. Common mode chokes are NOT inductors, they are parallel resonant circuits, and it is their resistive impedance at resonance that makes the choke effective. 73, Jim K9YC

Re: [Elecraft] Balun Questions

Hi Guy, Thank you. It is interesting that the ANSI test is based on physical “outer surface" deformity, rather than electrical (rf) performance. Although there is probably a degree of correlation between physical deformity and electrical (rf) performance. I agree the ANSI spec outlines a rathe

Re: [Elecraft] Balun Questions

Robert Nobis wrote: > After reviewing specs from several manufacturers, the “recommended” minimum bend radius for RG303 and RG400 is essentially the same at 1.0 inches. Hi Robert, I have wrapped RG400 on a two stack of FT240 form factor toroids with never an issue, without any change in electrica

Re: [Elecraft] Balun Questions

etter.    Funn. Mel, K6KBE From: Richard Fjeld To: elecraft@mailman.qth.net Sent: Monday, February 8, 2016 12:57 PM Subject: Re: [Elecraft] Balun Questions This doesn't answer your details, but what I did to test the one I made was simply to compare it to the balun in my man

Re: [Elecraft] Balun Questions

This doesn't answer your details, but what I did to test the one I made was simply to compare it to the balun in my manual roller inductor tuner. I used a short coax jumper between the tuner and the homebrew balun. Dick, n0ce On 2/6/2016 12:06 PM, Jim Allen wrote: Ok, so this morning, I went

Re: [Elecraft] Balun Questions

due to the foam dielectric. --- Chuck, AE4CW From: Mel Farrer [mailto:farrerfo...@yahoo.com] Subject: Re: [Elecraft] Balun Questions SORRY, but the min static bending radius for RG-303 is 25 mm and RG-400 is 35 mm. For torroid wrap which is better? __

Re: [Elecraft] Balun Questions

I just completed a 160/80M common mode choke made from 6 type 31 cores. Each core is 1/2" inside diameter, 1" outside diameter, and 1" long. (12.5mm, 25mm, 25mm). There are four windings of RG58 and I think this design is in agreements with Jim Brown, K9YC's RFI-ham.pdf. The choke hangs just be

Re: [Elecraft] Balun Questions

rd 3” and greater due to the foam dielectric. --- Chuck, AE4CW From: Mel Farrer [mailto:farrerfo...@yahoo.com] Subject: Re: [Elecraft] Balun Questions SORRY, but the min static bending radius for RG-303 is 25 mm and RG-400

Re: [Elecraft] Balun Questions

inger K2AV' ; 'Robert Nobis' Cc: elecraft@mailman.qth.net; 'Ron D'Eau Claire' Subject: Re: [Elecraft] Balun Questions SORRY, but the min static bending radius for RG-303 is 25 mm and RG-400 is 35 mm. For torroid wrap which is better? Mel, K6KBE

Re: [Elecraft] Balun Questions

gt; > > From: Chuck Catledge > To: 'Guy Olinger K2AV' ; 'Robert Nobis' > Cc: elecraft@mailman.qth.net; 'Ron D'Eau Claire' > Sent: Sunday, February 7, 2016 2:31 PM > Subject: Re: [Elecraft] Balun Questions > > At hamfests around the South

Re: [Elecraft] Balun Questions

t: Sunday, February 7, 2016 2:31 PM Subject: Re: [Elecraft] Balun Questions At hamfests around the Southeast, surplus RG400 is often found in terminated cables (usually BNC or N) in lengths up to around 20 feet.  The price I've paid is always less than $1.00 per foot, sometimes much l

Re: [Elecraft] Balun Questions

ary 07, 2016 01:08 To: Robert Nobis Cc: elecraft@mailman.qth.net; Ron D'Eau Claire ; Guy Olinger K2AV Subject: Re: [Elecraft] Balun Questions RG303 is not rated for the tight bends. RG400 with its fine stranded center conductor is rated for corner bends in aircraft wiring harnesses and

Re: [Elecraft] Balun Questions

At 01:07 AM 2/7/2016, K2AV wrote: I also came by bundles of miscellaneous 6 foot to 15 foot jumpers with various connectors on end for similar ridiculous low prices per foot. In the last few years I have found similar RG400 jumpers at the Dayton Hamvention at quite reasonable prices. Since I

Re: [Elecraft] Balun Questions

I can second Jim's concern about have one's work usurped by another. I can recall Googling a topic and having a paper come up on some Canadian's website that appeared to be written by him but in fact was my ladderline paper. I emailed him and asked him nicely to remove it and simply link to my

Re: [Elecraft] Balun Questions

Wow, that is eye opening! I always thought I was just lazy/cheap when I merely polished my amplifier tank coils and sprayed them with clear plastic (Krylon), but it seems I was doing the right thing after all. Vic 4X6GP/K2VCO > On 7 Feb 2016, at 3:48 AM, Wes (N7WS) wrote: > > On oft repeated

Re: [Elecraft] Balun Questions

Guy, After reviewing specs from several manufacturers, the “recommended” minimum bend radius for RG303 and RG400 is essentially the same at 1.0 inches. 73, Bob Nobis - N7RJN n7...@nobis.net > On Feb 6, 2016, at 23:07, Guy Olinger K2AV wrote: > > RG303 is not rated for the tight bends.

Re: [Elecraft] Balun Questions

RG303 is not rated for the tight bends. RG400 with its fine stranded center conductor is rated for corner bends in aircraft wiring harnesses and will not deform the dielectric within the bends. I would not wind any solid center conductor coax on a toroid. I would only buy cut lengths of RG400 aft

Re: [Elecraft] Balun Questions

On Sat,2/6/2016 4:33 PM, Jim Allen wrote: Almost all of G3TXQ's tests on his website with ferrite core baluns involved RG58, so I figured RG8X would be even better. I have a lot of it, and no RG58. Did you study the material on my website? My measurement method is clearly described in severa

Re: [Elecraft] Balun Questions

A favorite of mine for transmission line transformers or common-mode chokes (a.k.a. "baluns") is to use a twisted pair instead of coax. Cheap and effective and with a little calculation you can approximate any impedance line you want. K2 builders know this technique from winding T6 in their rig

Re: [Elecraft] Balun Questions

On oft repeated myth. See: http://k6mhe.com/n7ws/Plating.pdf On 2/6/2016 5:49 PM, Guy Olinger K2AV wrote: That's silvered strands whose silver sulphide patina or tarnish is conductive as opposed to the green copper sulphate that separates copper strands that have been water soaked. __

Re: [Elecraft] Balun Questions

Bob, Yes, it is a bit expensive: $2.91 per foot from “The Wireman” plus shipping. (For lengths under 100 feet.) 73, Bob Nobis - N7RJN n7...@nobis.net > On Feb 6, 2016, at 18:21, Bob McGraw K4TAX wrote: > > Yep, good stuff. Be sure of your budget before buying a roll. It is a bit > pric

Re: [Elecraft] Balun Questions

Yep, good stuff. Be sure of your budget before buying a roll. It is a bit pricey. Handles legal limit HF power with a reasonable SWR. 73 Bob, K4TAX On 2/6/2016 7:10 PM, Robert Nobis wrote: I have used RG303/U for chokes. A bit smaller diameter than RG400 (0.170 versus 0.195 inches). RG3

Re: [Elecraft] Balun Questions

I have used RG303/U for chokes. A bit smaller diameter than RG400 (0.170 versus 0.195 inches). RG303/U has a solid copper center conductor that is silver plated. The shield for RG303 is also silver plated copper. The jacket is Class 9 Teflon. Also the dielectric material is teflon. 73, Bob

Re: [Elecraft] Balun Questions

If one wants a small 50 ohm coax that will take QRO with a very large margin and was *designed* for bending and use in aircraft wiring harnesses then use RG400 to wind around your core. RG400 uses a fine stranded silvered copper center conductor that is more flexible than its Teflon dielectric. It

Re: [Elecraft] Balun Questions

Almost all of G3TXQ's tests on his website with ferrite core baluns involved RG58, so I figured RG8X would be even better. I have a lot of it, and no RG58. Luckily, these things are easy to work with, so if I ever have/want/need to change it, it's so easy even a lawyer can do it, 3 out of 5 tri

Re: [Elecraft] Balun Questions

K1WHS - Original Message - From: "Ron D'Eau Claire" To: Sent: Saturday, February 06, 2016 10:33 PM Subject: Re: [Elecraft] Balun Questions Bob makes an excellent point. I've seen cases where even "solid" dielectric did that over time because, aft

Re: [Elecraft] Balun Questions

Bob makes an excellent point. I've seen cases where even "solid" dielectric did that over time because, after all, it is not really solid. The dielectric is plastic so the coax can be bent. All coax has a minimum bending radius specification. Specific data is available on line but, in general, RG

Re: [Elecraft] Balun Questions

I would have concern that long term usage of RG-8X, being foam core dielectric material and bent in a tight radius, may allow the center conductor to migrate to the inside radius of the bend. The Minimum Bend Radius for RG-8X is 2.50". Thus the tight bend will allow the center conductor to

Re: [Elecraft] Balun Questions

If you're driving a 50 ohm load, then the cable wound around the core is just an extension of the transmission line and has no impedance modifying effects. The significant parameter is the common mode (CM) impedance. G3TXQ discusses a way to measure it here: http://www.karinya.net/g3txq/chokes/

Re: [Elecraft] Balun Questions

On Saturday, February 6, 2016, Jim Allen wrote: > I used RG8X coax, a 2.4" core, not sure exactly what mix, and 11 turns. > There is a *huge* variation in core materials and performance specifics found in the FT241 form factor. It really matters what the actual material is. On 160 the variatio

Re: [Elecraft] Balun Questions

Ok, so this morning, I went out to the shack and whipped up a balun, from a G3TXQ design I found on the website of W5DXP.com. It is coax wrapped around a ferrite core, with appropriate connectors in a plastic weathertight box. I used RG8X coax, a 2.4" core, not sure exactly what mix, and 11 tu

Re: [Elecraft] Balun suggestions

Maxwells' famous equations first published in the 1870's have proven to be extraordinarily accurate for all practical engineering purposes even after all of these years: http://www.aproged.pt/biblioteca/MaxwellII.pdf 73, Ron AC7AC -Original Message- It may come as a shock to some, b

Re: [Elecraft] Balun suggestions

iday, February 5, 2016 2:24 AM To: 'Wes (N7WS)'; elecraft@mailman.qth.net Subject: Re: [Elecraft] Balun suggestions Wes's point is that twin feeder is not automatically "balanced" - very far from it! Twin feeder happily supports both differential (equal and opposite, bala

Re: [Elecraft] Balun suggestions

Wes (N7WS) Sent: Thursday, February 4, 2016 4:18 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Balun suggestions I just pinched myself; I'm not dreaming and it's not April 1st, so I guess you're serious. You are also so wrong on so many points, I'm not going to waste ti

Re: [Elecraft] Balun suggestions

DJ0IP must be one of, if not the post prolific testers of baluns and chokes *attached to aerials* ever. He does not measure them in the lab. His measurements are practical and done with rigour using modest equipment. He has done thousands of measurements for common mode current, only a fraction

Re: [Elecraft] Balun suggestions

On Fri,2/5/2016 5:06 AM, w7aqk wrote: I don't know what the precise definition for "balanced" will end up being (assuming we end up with a consensus), The laws of physics are not determined by consensus. I am citing the definition upon which IEC and AES Standards are based, which are establis

Re: [Elecraft] Balun suggestions

Correct on all points. On 2/5/2016 6:06 AM, w7aqk wrote: Jim B. and All, I don't know what the precise definition for "balanced" will end up being (assuming we end up with a consensus), but In Jim B's critique about what was said, I think he cut and pasted so as to erroneously attribute comme

Re: [Elecraft] Balun suggestions

Jim B. and All, I don't know what the precise definition for "balanced" will end up being (assuming we end up with a consensus), but In Jim B's critique about what was said, I think he cut and pasted so as to erroneously attribute comments made by Don, W3FPR, as being made by Wes N7WS. It's g

Re: [Elecraft] Balun suggestions

the line. 73 from Ian GM3SEK -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes (N7WS) Sent: 05 February 2016 00:18 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Balun suggestions I just pinched myself; I'm not dreaming and it'

Re: [Elecraft] Balun suggestions

Jim, You might find that on some bands your antenna tunes better with a 1:1 balun and on others with a 4:1. Therefore, I recommend the Elecraft balun, which is switchable. It's rated at 250w so it should be adequate. 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ On

Re: [Elecraft] Balun suggestions

On Thu,2/4/2016 5:35 PM, Wes (N7WS) wrote: Even though we often refer to the output of the KAT500 (or any other device that normally connects to a coaxial line, the currents on the output should be equal and opposite - which is the definition of balanced. Sorry, that is NOT the definition of

Re: [Elecraft] Balun suggestions

Wes and all, Yes, that is one source of "sneak ground". A balun will cure that condition. 73, Don W3FPR On 2/4/2016 11:48 PM, Wes (N7WS) wrote: You mean like that "sneak ground" from the input of the tuner back to the grounded amp or exciter? Or are they floating too? On 2/4/2016 5:38 PM

Re: [Elecraft] Balun suggestions

You mean like that "sneak ground" from the input of the tuner back to the grounded amp or exciter? Or are they floating too? On 2/4/2016 5:38 PM, Don Wilhelm wrote: So connecting a balanced feedline to a PL-259 is not so far fetched - providing the shell of the PL-259 (and enclosure of the K

Re: [Elecraft] Balun suggestions

On Thu,2/4/2016 12:55 PM, Jim Allen wrote: I am changing around my modest antenna configuration now. I have been using the K2/100 with my AH-4, and now wish to use the KAT100 with balanced feedline antennas. What balun, homebrew or commercial, if any, should I use? I almost always run 5 wat

Re: [Elecraft] Balun suggestions

I was wrong. Clearly, I'm dreaming. On 2/4/2016 5:38 PM, Don Wilhelm wrote: Wes, I don't mean to be contentious, but under ideal conditions, what Ron said is true. Even though we often refer to the output of the KAT500 (or any other device that normally connects to a coaxial line, the curre

Re: [Elecraft] Balun suggestions

I suggest reading work by w9cf before getting concerned about balancing tuners. http://fermi.la.asu.edu/w9cf/articles/balun/index.html On Feb 4, 2016, at 7:38 PM, Don Wilhelm wrote: Wes, I don't mean to be contentious, but under ideal conditions, what Ron said is true. Even though we often

Re: [Elecraft] Balun Sugestions

6 17:10:39 -0600 From: Bob McGraw K4TAX To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Balun suggestions Message-ID: <56b3da6f.3090...@blomand.net> Content-Type: text/plain; charset=windows-1252; format=flowed As one that has personally used a balanced fed antennas for years, I sugges

Re: [Elecraft] Balun suggestions

Wes, I don't mean to be contentious, but under ideal conditions, what Ron said is true. Even though we often refer to the output of the KAT500 (or any other device that normally connects to a coaxial line, the currents on the output should be equal and opposite - which is the definition of b

Re: [Elecraft] Balun suggestions

On Thu,2/4/2016 12:55 PM, Jim Allen wrote: What balun, homebrew or commercial, if any, should I use? I almost always run 5 watts, all CW. k9yc.com/RFI-Ham.pdf Since you're running QRP, a single 2.4-in o.d. #31 core is all you need. Study the data in Appendix One for small diameter wire, an

Re: [Elecraft] Balun suggestions

I just pinched myself; I'm not dreaming and it's not April 1st, so I guess you're serious. You are also so wrong on so many points, I'm not going to waste time trying to refute or correct them. Jim, please ignore everything said below. Wes N7WS On 2/4/2016 3:05 PM, Ron D'Eau Claire wrote

Re: [Elecraft] Balun suggestions

As one that has personally used a balanced fed antennas for years, I suggest you review the info on this site. http://www.dj0ip.de/balun-stuff/ Good stuff on evaluating or building a proper balun. And for open wire fed antennas: http://www.dj0ip.de/open-wire-

Re: [Elecraft] Balun suggestions

Your feed line will do the job by itself so no additional "balun" is needed. Keep in mind that a 1:1 balun is really just a length of feed line, usually wound on a toroidal core to make the required length shorter than if it was in open air. The "old-school" baluns were just a pair of air wound coi

Re: [Elecraft] Balun suggestions

Jim, If your balanced feedline comes into the shack and you are running QRP, take a look at the Elecraft BL2. 73, Don W3FPR On 2/4/2016 3:55 PM, Jim Allen wrote: K2/100 and KAT100 here. I am changing around my modest antenna configuration now. I have been using the K2/100 with my AH-4, an

Re: [Elecraft] Balun suggestions

M87wj http://observer.wunderwood.org/ (my blog) > On Feb 4, 2016, at 1:11 PM, Bert Craig wrote: > > I have to firmly vouch for Balun Concepts. > > Sent from my android device. > > -Original Message- > From: Jim Allen > To: elecraft@mailman.qth.net > Sent: Thu

Re: [Elecraft] Balun suggestions

Don't by-pass the Elecraft BL-2  $40  250 W 4:1 and 1:1 select able . Mel, K6KBE From: Walter Underwood To: Elecraft Reflector Sent: Thursday, February 4, 2016 1:17 PM Subject: Re: [Elecraft] Balun suggestions Balun Designs makes high quality baluns at fair prices.

Re: [Elecraft] Balun suggestions

Balun Concepts. > > Sent from my android device. > > -Original Message- > From: Jim Allen > To: elecraft@mailman.qth.net > Sent: Thu, 04 Feb 2016 15:55 > Subject: [Elecraft] Balun suggestions > > K2/100 and KAT100 here. > > I am changing around my m

Re: [Elecraft] Balun suggestions

I have to firmly vouch for Balun Concepts. Sent from my android device. -Original Message- From: Jim Allen To: elecraft@mailman.qth.net Sent: Thu, 04 Feb 2016 15:55 Subject: [Elecraft] Balun suggestions K2/100 and KAT100 here. I am changing around my modest antenna configuration now

[Elecraft] Balun suggestions

K2/100 and KAT100 here. I am changing around my modest antenna configuration now. I have been using the K2/100 with my AH-4, and now wish to use the KAT100 with balanced feedline antennas. What balun, homebrew or commercial, if any, should I use? I almost always run 5 watts, all CW. 73 de W

[Elecraft] Balun designs 1110U

West Mountain 4004U This unit was purchased and mounted but never used. Priced at 75.00 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.ne

[Elecraft] Balun Ground Connection

Several days ago I responded to someone about a situation with their antenna and balun.  I basically said my experience with an antenna at my station was that by connecting the ground on the balun to my station ground the SWR were to >25 and I had operated with the ground disconnected.  I receiv

Re: [Elecraft] Balun Ground Connection

First thing I would say it to literally model your back yard, including all your antennas and feedlines. In the same model. That may cost you some for serious models that will handle that much wire. Or you can visit a friend who has the software and do it on his. In our head, among all the misce

[Elecraft] Balun Ground Connection

Hi Rich, This DXE balun is just a hefty 1:1 choke balun  It's a high grade coax (50ohm) wrapped through ferrite cores.  The balanced terminals are floating and the unbalanced end is connected to the aluminium housing and the shield of the 6 foot length of RG213 coax which connect

Re: [Elecraft] Balun Ground Connection

John, I'm not surprised at your findings in light of my experience.  Regarding the ATUs being able to tune in this case, I'm not surprised.  Elecraft tuners will match nearly a complete open and short...been there, done that.  I really wish they were limited to something like 6:1 to prevent

Re: [Elecraft] Balun Ground Connection

Hi Jim & group I did an experiment today and tied the balun case/coax shield to station ground via the stud. I found 2 things: # 1 the manual tuner settings required for 1:1 match changed on all bands, but the KAT3 and manual tuner were still able to find a 1:1.0 match on all bands 80m - 10

Re: [Elecraft] Balun Ground Connection

Jim. I would strongly suggest that is an indication of a problem in your antenna system somewhere (my first guess would be between the transmitter and the balun). I would start by substituting the coax to the balun. 73, Don W3FPR On 9/20/2012 3:53 PM, Jim Harris wrote: > John, > I found that

Re: [Elecraft] Balun Ground Connection

On 9/20/2012 12:53 PM, Jim Harris wrote: > I found that by connecting the balun ground to my station ground I had >25 > SWR on all bands. I just let it float..no problems so far. That suggests something wrong with your antenna system. 73, Jim K9YC ___

[Elecraft] Balun Ground Connection

John, I found that by connecting the balun ground to my station ground I had >25 SWR on all bands.  I just let it float..no problems so far. 73 Jim, W0EM  < Should I connect the balun, via the case stud, directly to station ground??>>>  John VK7JB

[Elecraft] Balun testing using K3 and XG3

4:1 current Balun measurements can be performed using a XG3 signal source and a K3 as the detector. Configuration: K3 RX input, 10 dB attenuator, 50 ohm resistor from attenuator inside conductor to 200 ohm Balun connector, 100 ohm from attenuator shield to other 200 ohm Balun connector, XG3 connec

Re: [Elecraft] Balun at input or output of tuner

Hi Jim, Thanks for the tip on the AV-640...I'll surely look into that. I am looking for a self-supporting solution to minimize my impact upon the XYL's view (to her credit, she's been incredibly patient and understanding about that). The home brew vertical dipole I'm running now requires guys

Re: [Elecraft] Balun at input or output of tuner

On 12/13/2011 12:53 PM, David Herring wrote: > I'd like to ask a few questions. David, I hardly know where to begin in responding to your question. First, if you want a self-supporting vertical antenna for 30-10M, there are some really good choices that you can buy, that can be easily installed

Re: [Elecraft] Balun at input or output of tuner

I hesitate to step between Dean and anyone else but... it seems to me that a Balun with good enough common mode choking should fulfill all the isolation requirements we might have. The isolation any Balun provides takes place at the point it is inserted, so a Balun built for 50 Ohms may be use

Re: [Elecraft] Balun at input or output of tuner

On 12/14/2011 8:29 PM, Ross Primrose N4RP wrote: > Is it just me, or does that paragraph have a glaring typo in it Yep! Thanks. It should read, "if we put the choke at the antenna, the differential loss . . . . . " Jim K9YC __ El

Re: [Elecraft] Balun at input or output of tuner

ce away from the tuner. Paul, W9AC - Original Message - From: "Don Wilhelm" To: "Dean Straw" Cc: Sent: Wednesday, December 14, 2011 7:59 PM Subject: Re: [Elecraft] Balun at input or output of tuner > Dean, > > The last two paragraphs of your writeup do

Re: [Elecraft] Balun at input or output of tuner

On 12/14/2011 4:59 PM, Don Wilhelm wrote: > The balun has the same loss no > matter where it is placed, so lets assume it is placed at the output. There we go with that nasty word again (balun) -- we're talking about a common mode choke, right? :) The problem is more complex than it looks. Let'

Re: [Elecraft] Balun at input or output of tuner

Dean, The last two paragraphs of your writeup do not seem relevant to the discussion of balun (CM choke) at the input or output Those paragraphs deal with operating coax at a very high 60:1 SWR, and neither support nor agree with the other points. Consider the following: A situation where th

Re: [Elecraft] Balun at input or output of tuner

On 12/13/2011 2:47 PM, Ian White GM3SEK wrote: > The reduction in loss is almost entirely due to increase in the diameter > of the center conductor (because that conductor has the largest current > density and hence the highest skin effect losses). The foam dielectric > is merely something that*has

Re: [Elecraft] Balun at input or output of tuner

I used to think that dielectric losses were a significant factor until someone pointed out the attenuation data for various transmission lines between 2 and 500 MHz. The plots for all the various transmission lines are straight lines. If dielectric losses were involved, they should curve toward the

Re: [Elecraft] Balun at input or output of tuner

Jim Brown wrote: >On 12/13/2011 11:48 AM, Alan Bloom wrote: >> Is that a valid assumption? I thought that much of the loss in coax is >> due to the dielectric loss of the insulation. That implies that the >> bifilar winding should have less loss than coax. > >This is a very common misconception,

Re: [Elecraft] Balun at input or output of tuner

On 12/13/2011 11:48 AM, Alan Bloom wrote: > Is that a valid assumption? I thought that much of the loss in coax is > due to the dielectric loss of the insulation. That implies that the > bifilar winding should have less loss than coax. This is a very common misconception, and it is VERY wrong be

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