Re: [Elecraft] how to optimize end-fed?

To: Fred Jensen Cc: <elecraft@mailman.qth.net> Subject: Re: [Elecraft] how to optimize end-fed? 2016-09-30 21:59 GMT+02:00 Fred Jensen <k6...@foothill.net>: > This is reminiscent of one of the five volumes in Douglas Adams' > trilogy, "The Hitchhikers Guide to the Galaxy." I

Re: [Elecraft] how to optimize end-fed?

I think what the original question is missing is the fact that we are talking about the whole system, not just the inductor or the ATU. The system is the final amplifier, the ATU, the feedline, the UNUN and the antenna. If minimizing the loss in the ATU increases the loss elsewhere, then we

Re: [Elecraft] how to optimize end-fed?

Capacitors should usually have less loss than inductors. This is not true for manual turners with polyvaricons. Those are fairly lossy capacitors. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Oct 1, 2016, at 10:43 AM, Kevin - K4VD wrote: >

Re: [Elecraft] how to optimize end-fed?

Hi Holger: I just finished reading an article that may answer your question: http://www.arrl.org/files/file/Technology/tis/info/pdf/9501046.pdf If I'm understanding it correctly, the inductor's Q factor is the issue. The Cout capacitance should be set to the highest value possible with the L and

Re: [Elecraft] how to optimize end-fed?

To: elecraft@mailman.qth.net Subject: Re: [Elecraft] how to optimize end-fed? In my opinion, what you want is the lowest SWR on the feed line between the Balun and the tuner. The higher the mismatch, the higher the feedline loss. Let's say you're operating on 14.300 MHz, and your wire is roughly 9.85

Re: [Elecraft] how to optimize end-fed?

In my opinion, what you want is the lowest SWR on the feed line between the Balun and the tuner. The higher the mismatch, the higher the feedline loss. Let's say you're operating on 14.300 MHz, and your wire is roughly 9.85 meters (32' 4") long. If I did the math right, that's pretty much

Re: [Elecraft] how to optimize end-fed?

Holger, Your question was indeed crystal clear, so I am sorry that you had to make this experience. Don't worry and have fun! BTW, I suspect that the tuning algorithm used by Wayne for all the AT of Elecraft does start his try with the minimum inductance (unknown from competitive reasons, hi)?

Re: [Elecraft] how to optimize end-fed?

Holger Schurig-2 wrote > I have an end-fed antenna with some random wire. The UNUN at one end of it > has three sockets to plug the random wire in: 1:4, 1:9 and 1:16. > > My KX3 has the built-in ATU. > I now want to find out on which band I best use which one of the sockets. > > Am I right to

Re: [Elecraft] how to optimize end-fed?

2016-09-30 21:59 GMT+02:00 Fred Jensen : > This is reminiscent of one of the five volumes in Douglas Adams' trilogy, > "The Hitchhikers Guide to the Galaxy." I understand that either my english is very weird. Or that I can't explain things good. But that you and Davidthink

Re: [Elecraft] how to optimize end-fed?

> > You will have to get more specific about the wire lengths and the band(s) > of operation for specific answers Nope. I don't have. My question was really: is it desirable to always aim for the lowest inductance of an ATU tuning. AFAIK this question is totally independent from the wire

Re: [Elecraft] how to optimize end-fed?

Yes ... and forty three is held in reverence by others who attribute magical properties to it. :-) 73, Fred K6DGW - Sparks NV DM09dn - Northern California Contest Club - CU in the Cal QSO Party 1-2 Oct 2016 - www.cqp.org On 9/30/2016 1:22 PM, David Kuechenmeister wrote: I think 42 might be

Re: [Elecraft] how to optimize end-fed?

I think 42 might be a valid answer, depending on the question. Forty-one is certainly a good answer! There are a couple pages that try to address the question of what long wire lengths are the easiest to tune, i.e. present a low SWR to the matching unit. The first is at 

Re: [Elecraft] how to optimize end-fed?

Let me see if I understand the question: You're looking for a simple algorithm to tell you how to "best" deploy a wire of indeterminate length in a configuration yet to be specified using a transformer of indefinite impedance ratio on any of a number of unnamed bands. This is reminiscent of

Re: [Elecraft] how to optimize end-fed?

Maybe I'm missing something, but you have a selection of taps, the highest is 16:1. If the wire is exactly 1/2 wave, then the impedance is going to be very high, and the 16:1 tap will come closest to matching a high impedance load. If the wire is some multiple of 1/4 wave but not a an even

Re: [Elecraft] how to optimize end-fed?

Holger, There are many answers to your questions. You will have to get more specific about the wire lengths and the band(s) of operation for specific answers. If you want an easy antenna that will work for 40 thru 10 meters with no feedline, download the KXAT1 manual from Elecraft and look

Re: [Elecraft] how to optimize end-fed?

If you are working QRP, take a look at http://www.qrpproject.de/UK/atu.htm This describes the 'Fuchs' half wave antenna and a matching unit in kit form. I have built this, very compact, it works well, gives a good indication of optimum tune adjustment and is not totally dependent on a good

Re: [Elecraft] how to optimize end-fed?

> Then I should go for the highest impedance and select 1:16, should I? I meant antenna impedance, not the impedance of the internal ATU inductor. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] how to optimize end-fed?

Fred Jensen writes: > How long is the wire? > What band? Who knowns? I'm not asking for a *specific* optimization, I'm asking for a general rule of thumb. I'm not talking about a permanent installation, I'm talking about going to some field, or hill. I don't know the band

Re: [Elecraft] how to optimize end-fed?

This discussion makes me wonder if the ARRL Handbook and the ARRL Antenna Book have somehow been banned! This is BASIC antennas, guys. This is not CB radio, it is ham radio, and we're supposed to be able to study this stuff and figure it out! Building antennas is one the easiest parts of ham

Re: [Elecraft] how to optimize end-fed?

ecraft@mailman.qth.net Subject: Re: [Elecraft] how to optimize end-fed? Mel, Your points are well taken when you are feeding an end-fed half wave or a radiator of a multiple of a half wave. The ideal parallel tank circuit should be fed with a coupling coil that is isolated from the larger secondary coil

Re: [Elecraft] how to optimize end-fed?

Mel, Your points are well taken when you are feeding an end-fed half wave or a radiator of a multiple of a half wave. The ideal parallel tank circuit should be fed with a coupling coil that is isolated from the larger secondary coil - that reduces or eliminates common mode currents in the

Re: [Elecraft] how to optimize end-fed?

:57 PM Subject: Re: [Elecraft] how to optimize end-fed? > Am I right to assume that the ATU settings with the lowest L is > always the best? I don't know exactly what you mean by "best," but you said "always" so I'd say no.  If the length of your wire is in the vicinity o

Re: [Elecraft] how to optimize end-fed?

> Am I right to assume that the ATU settings with the lowest L is > always the best? I don't know exactly what you mean by "best," but you said "always" so I'd say no. If the length of your wire is in the vicinity of n * 90 degrees where n is any odd integer, it will have a low-ish impedance

[Elecraft] how to optimize end-fed?

Hi all, I have an end-fed antenna with some random wire. The UNUN at one end of it has three sockets to plug the random wire in: 1:4, 1:9 and 1:16. My KX3 has the built-in ATU. I now want to find out on which band I best use which one of the sockets. As a first step, I wrote a simple program