[Boatanchors] Was 813 grid to filament... - now antenna tuners

Sat Oct 3 18:19:01 EDT 2015

Well, virtually everybody gets the meaning when you use the term, so the utility of the expression is retained!

* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 *  
* * * * * * * * * * * 

> To: k2gkk at hotmail.com; boatanchors at mailman.qth.net
> From: wrcromwell at gmail.com
> Date: Sat, 3 Oct 2015 18:10:08 -0400
> Subject: Re: [Boatanchors] Was 813 grid to filament... - now antenna tuners
> 
> Well...
> 
> ...there is another term that must expire before I do.
> 
> Crossing it off my list now.
> 
> 73,
> 
> Bill  KU8H
> 
> 
> 
> On 10/03/2015 01:41 PM, D C _Mac_ Macdonald wrote:
> > *I subscribe to a Merriam-Webster list entitled "Word of the Day."  A 
> > very recent posting debunked the commonly held idea that "doozy" and 
> > its various other spellings somehow relates to the Duesenberg 
> > automobile.  The etymology of the word apparently relates way back to 
> > the word "daisy" (and others) in the sense of meaning a superlative 
> > example of a specific grouping.  This root is apparently at least a 
> > full century before the invention of the automobile! *
> > *
> > * * * * * * * * * * *
> > * 73 - Mac, K2GKK/5 *
> > * (Since 30 Nov 53) *
> > * k2gkk hotmail com *
> > * Oklahoma City, OK *
> > * USAF & FAA (Ret.) *
> > * * * * * * * * * * *
> >
> >
> > *
> > *> To: boatanchors at mailman.qth.net
> > > From: wrcromwell at gmail.com
> > > Date: Sat, 3 Oct 2015 13:11:31 -0400
> > > Subject: Re: [Boatanchors] Was 813 grid to filament... - now antenna 
> > tuners
> > >
> > > Thank you Gary,
> > >
> > > In spite of occasional curmudgeonly behavior here most of the list
> > > members are intelligent enough to figure out most typos (there are some
> > > real Duesies once in a while). I didn't notice any typos but I'm not
> > > necessarily the sharpest tool in the shed. Besides that - we are not
> > > draughting legislation here so typos are often inconsequential.
> > >
> > > I have two Johnson Matchboxes and some L networks with which I tune the
> > > transmitter end of my antenna system. I definitely tune something so I
> > > often call it an antenna tuner because my antenna system starts 
> > where my
> > > transmitter (or receiver) leaves off.
> > >
> > > *Real Duesie* comes to us from having a fabulous automobile named a
> > > Duesenberg; a real duesie as opposed to a cheap flivver. Some typos are
> > > unintelligible - real duesies
> > >
> > > 73,
> > >
> > > Bill KU8H*
> > >
> > > On 10/03/2015 09:19 AM, Gary Peterson wrote:
> > > > ”You are correct. Actually what they are are (adjustable) 
> > impedance transformers...
> > > > Eugene W2HX”
> > > >
> > > >> N0DGNsaid:
> > > >> They are matchboxes! the impedance of the antenna hasn't changed 
> > one little bit!
> > > >> All you do is make the transmitter/transceiver happy. The feed 
> > line and the antenna don't change one iota.
> > > > It is not incorrect to call the matching device in your ham shack 
> > an “antenna tuner,” rather than a matchbox, a transmatch or an 
> > impedance transformer.
> > > >
> > > > Walter Maxwell, W2DU (SK) wrote on this subject in a series of 
> > articles in QST, called “Another Look at Reflections.” He also 
> > published at least three editions of a book called “Reflections.”
> > > >
> > > > Mr. Maxwell was no dummy when it came to this subject. He was an 
> > antenna design engineer, employed by RCA, and several of his designs 
> > ended up in Earth orbit and on the Moon.
> > > >
> > > > Maxwell pointed out the importance of the conjugate matching 
> > theorem, which states that if a conjugate match is achieved at one 
> > point in a system, then a conjugate match exists in every other point 
> > in the same system.
> > > >
> > > > A conjugate match is defined (paraphrasing on my part) as having 
> > equal resistances and equal reactances (if there is any), of opposite 
> > sign, as one looks in both directions from a point in a system. An 
> > example would be at the feedpoint of a dipole where, at a given 
> > frequency, the resistance of the dipole is 82 ohms and the reactance 
> > is +j 35 ohms (inductive). Looking back into the feedline, the 
> > resistance would be 82 ohms and the reactance would be –j 35 ohms 
> > (capacitive).
> > > >
> > > > Assuming a low loss feedline, this means that if you achieve a 
> > match, in the ham shack, with your L, tee, pi or whatever network 
> > between your transmitter and feedline input, there now exists a 
> > conjugate match between the end of the feedline and the antenna. One 
> > of his articles was entitled “My Transmatch Tunes My Antenna,” as I 
> > recall.
> > > >
> > > > Mr. Maxwell is in good company. Several of my BSEE and MSEE 
> > friends are in complete agreement with him.
> > > >
> > > > There is no reason to jump on anyone who refers to the matching 
> > unit in their shack as an “antenna tuner.” It is just one of several 
> > correct terms for the device.
> > > >
> > > > Gary, KØCX
> > > >
> > > > PS - I just got out of bed...so I hope there are no typos in above...
> 
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