Re: [Elecraft] 9:1 Balun AND "random antennas"

Hi Dick, Sure, you're welcome to forward stuff like this. As to stuff on my website -- I do NOT permit it to be copied to other websites, but I DO encourage links to it. 73, Jim K9YC On Wed,2/1/2017 8:16 AM, Richard Fjeld wrote: Jim, If you don't object, I'd like to save this and forward

Re: [Elecraft] 9:1 Balun

Practical side only. Assume you use a random wire antenna. AT in K2 or KX3 will not match all bands directly. It will match with BL1 or BL2 in 4:1 mode. This is because: 1. After transformation, the impedance is more manageable to KAT2 or KXAT3. 2. Loss in balun. Mainly on lower bands with short

Re: [Elecraft] 9:1 Balun AND "random antennas"

Jim, If you don't object, I'd like to save this and forward to people as arguments develop on these subjects. I wish you had touched on '4:1 baluns'. Except for this group, so many people I talk to think a balun should be 4:1, even in their tuners. I think it is DX Engineering that

Re: [Elecraft] 9:1 Balun

Oh, whatever power is generated by the transmitter is going to radiate. The classic example of "radiating power" that is completely and totally uninteresting is when you dump the power into a resistor (a dummy load) and the power is radiated as heat. There is a contest where the participants

Re: [Elecraft] 9:1 Balun

On Tue, Jan 31, 2017 at 8:53 PM, Thomas Horsten wrote: > The ATU typically sits at the rig end where a balun sits at the antenna > feedpoint ​There's the difference. I'm feeding my dipole with 600 ohm ladder line so my 4:1 BALUN is right outside my window. The coax (heavily

Re: [Elecraft] 9:1 Balun

Kev and all, A voltage "balun" can be tapped to produce a wide range of impedance transformation possibilities, but the voltage balun will have no effect on the problem of RF on the outside of the coax shield. The modern consensus is that only common mode chokes should be used on the

Re: [Elecraft] 9:1 Balun

While it is "satisfying" to think of the ATU matching capability in terms of SWR, that is not entirely valid. A lot depends on frequency - at higher frequencies the "SWR matching range" will be greater than on lower frequencies. The only valid spec for the matching range is the available

Re: [Elecraft] 9:1 Balun

Many manual ATU's consist of a variable capacitor and a tapped inductor. It's a matching network but also works as an "on-the-fly" switchable balun. The difference is the location. The ATU typically sits at the rig end where a balun sits at the antenna feedpoint (and so may present the coax with a

Re: [Elecraft] 9:1 Balun

On Tue, Jan 31, 2017 at 8:03 PM, Lynn W. Taylor, WB6UUT < k...@coldrockshotbrooms.com> wrote: > > That doesn't say the antenna would radiate it, but the transmitter could > make power and the tuner/transmission line would deliver it to the radiat ​Why wouldn't the antenna radiate it? Seems to

Re: [Elecraft] 9:1 Balun

That's the problem with oversimplifying an explanation. I read the original as "is it best practice to always use a 9:1 balun" and the answer of course is, "if you don't need a 9:1 impedance transformation, then you don't need a 9:1 balun." 73 -- Lynn On 1/31/2017 5:17 PM, K9MA wrote: On

Re: [Elecraft] 9:1 Balun

On 1/31/2017 19:03, Lynn W. Taylor, WB6UUT wrote: If I did the math right (always a question) your load must be between about 5 ohms and 500 ohms, so if your antenna is about 400 ohms (not resistance, but impedance) then you're okay. Not necessarily. That 400 Ohms could be almost pure

Re: [Elecraft] 9:1 Balun

According to the KX3 documentation, the KXAT3 will handle a 10:1 VSWR and "match" it. If I did the math right (always a question) your load must be between about 5 ohms and 500 ohms, so if your antenna is about 400 ohms (not resistance, but impedance) then you're okay. If you have a 600 ohm

Re: [Elecraft] 9:1 Balun

There's quite a lot of interesting theory in the thread, but I think for practical purposes my original answer still covers it, under the premise we're talking QRP with a short feedline of RG58 (a few yards). Small autotransformer baluns like the LDG 4:1 I use (I haven't tried the Elecraft one

Re: [Elecraft] 9:1 Balun

We have all learned to say, "Yes Dear." and carry on. 73, Kevin. KD5ONS On 1/31/2017 3:11 PM, Fred Jensen wrote: This list is a lot like being male and married ... no matter what you do or say, you're going to be told you're wrong. [:-) Most common baluns are *not

Re: [Elecraft] 9:1 Balun

This list is a lot like being male and married ... no matter what you do or say, you're going to be told you're wrong. [:-) Most common baluns are *not transformers* as the energy does not pass solely from input to output by magnetic coupling. In fact, I would hazard a guess that *none* of

Re: [Elecraft] 9:1 Balun

What I have failed to see in this thread is that the *wire* in a proper "balun" (more properly a common mode choke) is a transmission line, That transmission line can be two conductors side by side, or it can be two twisted wires, or it can be coax or any other type of transmission line. Its

Re: [Elecraft] 9:1 Balun

AM To: gliderboy1955 <gliderboy1...@yahoo.com>; Elecraft@mailman.qth.net Subject: Re: [Elecraft] 9:1 Balun Be careful in the 9 to 1 vs 4 to 1 vs 1 to 1. The 9:1 is generally an UNUN. When you run 100 watts or less most 1kw manufactured baluns or Ununs will take a wide variety of SWR if you ar

Re: [Elecraft] 9:1 Balun

Excellent explanation, Joe. Thanks, matt W6NIA On 1/31/2017 12:12 PM, Joe Subich, W4TV wrote: On 1/31/2017 2:16 PM, Fred Jensen wrote: > A bal-un is a transformer. Technically, it has two windings on a > ferromagnetic core material which for RF is typically some flavor of > ferrite,

Re: [Elecraft] 9:1 Balun

On 1/31/2017 2:16 PM, Fred Jensen wrote: > A bal-un is a transformer. Technically, it has two windings on a > ferromagnetic core material which for RF is typically some flavor of > ferrite, usually in the form of a toroid. Most common baluns are *not transformers* as the energy does not pass

Re: [Elecraft] 9:1 Balun AND "random antennas"

On 1/31/2017 1:50 PM, Jim Brown wrote: Last I looked, there was no description of the Elecraft "balun" telling us what it is. Perhaps Eric or Wayne could add that to the catalog listing for it. The manual for the Elecraft BL2 shows exactly what it is:

Re: [Elecraft] 9:1 Balun

From the un-un/bal-un traffic, it seems there is some confusion and a couple of "alternative facts" regarding this subject. Fortunately, it is much more straightforward that it might seem. A bal-un is a transformer. Technically, it has two windings on a ferromagnetic core material which for

Re: [Elecraft] 9:1 Balun AND "random antennas"

All of this discussion becomes badly confusing by failing to describe these circuit elements by their real name. The word "balun" is a bastard -- it is widely used to describe nearly a dozen things that are VERY different from each other. W4TV got it right by adding the correct description,

Re: [Elecraft] 9:1 Balun

I have limited experience with a wire fed via a 9:1 "un-un", but that experience was VERY good. I borrowed a KX3 from a friend when I went to visit family in FL a few years ago. I had a 9:1 "un-un", about 126' of wire, and 50 feet of RG8-X. I got the feedpoint, up 30 feet into a tree, and the far

Re: [Elecraft] 9:1 Balun

Be careful in the 9 to 1 vs 4 to 1 vs 1 to 1. The 9:1 is generally an UNUN. When you run 100 watts or less most 1kw manufactured baluns or Ununs will take a wide variety of SWR if you are only running 100 watts. Because this thread is I believe about QRP the amount of power dissipated due to loss

Re: [Elecraft] 9:1 Balun

On 1/31/2017 3:43 AM, Thomas Horsten wrote: Depends on your random wire and what band(s) you want to use. For some bands the 9:1 "balun" (not used as a true balun in this case, since both the coax and the random wire are unbalanced by nature) will step the feedpoint impedance down to something

Re: [Elecraft] 9:1 Balun

Depends on your random wire and what band(s) you want to use. For some bands the 9:1 "balun" (not used as a true balun in this case, since both the coax and the random wire are unbalanced by nature) will step the feedpoint impedance down to something that's a better match for the 50 ohm coax,

[Elecraft] 9:1 Balun

What are the advantages/disadvantages of using a 9:1 balun v. using the switchable Elecraft balun at 1:1 or 4:1 or no balun at all when using a random wire portable? Why 9:1? Thanks  73 Eric WD6DBM Sent on my Samsung Galaxy S® 6. __