Re: Why use s balanced tuner?

Reg Edwards wrote:

"Tim Wescott" <tim@xxxxxxxxxxxxxxxx> wrote in message
news:MOKdnXMrI8I7yiTeRVn-og@xxxxxxxxxxxxxxx

Reg Edwards wrote:


Why use a balanced tuner when a less expensive, easier to operate,
unbalanced tuner, in conjunction with a simple choke-balun, will


do

just as well?

Insert the 2-wire choke-balun between the unbalanced tuner and the
balanced transmission line.
----
Reg.



Because a balun particularly lossy at high SWR -- with a balanced 

tuner

followed by a balun you present the balun with the correct 

impedance, so

it's at its best.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com



========================================
Tim!

I don't know what design services you offer but you are WRONG.

You must have been reading the wrong comical magazines.

A choke balun is amongst the most power-efficient devices.

It consists only of a pair of wires wound around a ferrite ring. It is
just a very short transmission line of the same length as the wire and
has the same very low loss.

It has a phase shift of the same length of line.  Which is immaterial
insofar as the tuner is concerned.  It merely changes the tuner L and
C settings.
----
Reg.

Sorry.  I thought you were asking for help.  My mistake.

Odd that you should answer the question when you already know the answer, though.

To answer you unasked question: No, I do not have any test results, so you are correct that I am just repeating the absorbed wisdom of others. I'll be sure to qualify any similar answers I give in the future. Until I get an HF system up again I won't be doing any measurements, so don't hold your breath.

To ask you the same question:  would you please post _your_ test results?

Pontificating from first principals is what you do if you are engaged in preliminary design or the unpaid answering of questions.

Sticking to your guns in such cases is tilting over to philosophy, religion, incompetence or internet trolling.

But you are sure enough of yourself to use capital letters when telling me I was mistaken, so you cannot possibly be incompetent or a spinner of trolls.

So I am confident that you are working from real, measured data, not just derived results based on calculations or reasoning from first principals. At most you are once removed from some reliable individual or group who has done the measurements. It is very ungenerous of you not to share a properly detailed report on your experiments, or a reference to the report of the folks who did do the work -- a link to a page will do, or even a reference to a periodical or book should the information not be available on the web.

I'm ready to change my thinking just as soon as I see something credible, and quite interested in the results because I don't see the point in building a balanced tuner if my existing unbalanced one will do.

Thanks.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
.

Relevant Pages

  • Re: dipole length vs db
    ... loss out of the tuner into the loading coils. ... More spacing between wires takes us back to skin effect. ...
    (rec.radio.amateur.antenna)
  • Re: Multi-band dipole question
    ... band dipole. ... individual band wires. ... Yes, the tuner costs some money, but it's a one time investment, and makes playing with wire antennas much more pleasant and fast. ...
    (rec.radio.amateur.antenna)
  • Re: Check out my new web site!
    ... > I have forwarded your comments to my web site developer. ... >> Jim Slaughter wrote: ... >> Tim Wescott ... >> Wescott Design Services ...
    (rec.models.rc.air)
  • Re: FM Demod question
    ... > approximation and will distort for large phase jumps. ... > like this for narrow band FM; it's nice to know you're out there hacking ... > Tim Wescott ... > Wescott Design Services ...
    (comp.dsp)
  • Re: Check out my new web site!
    ... I'm on DSL which isn't as ... I have broadband and it still takes forever ... >>> Tim Wescott ... >>> Wescott Design Services ...
    (rec.models.rc.air)