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The mentioned article/file is uploaded as “Antenna_Paper_Part3.pdf” Sent: Sunday, October 30, 2022 3:37 PM To: [email protected] Subject: Re: [loopantennas] Optimizing Small Untuned Loop

Raphael Wasserman <wassermanr46@...> added folder */Antenna Mismatch and Effiiciency Factors* --- The following files and folders have been uploaded to the Files area of the

All, I am attaching an interesting article where are described factors such as antenna efficiency and antenna mismatch that will effect AF value. This will let you re-think I have not yet

The STLcalc program file needs to have permissions set to executable mode, a fact which I failed to note in the README file. I have edited the README file (attached) to add a step that describes this

The STLcalc program file needs to have permissions set to executable mode, a fact which I failed to note in the README file. I have edited the README file (attached) to add a step that describes this

Hi Martin, 1. I was interested to know how works Duffy's published calculator for small loops. Of course, all intermediate steps of calculations with this device were unknown for me but Duffy did

But in a later post you say:- The efficiency will be the same for tuned or untuned small loop antennas because neither radiation resistance nor loops ohmic loss can be changed These seem to be

Rick, 1. The efficiency of antenna K is defined as a ratio of (R radiation/ R radiation + R antenna loss), where R radiation value is significantly less than R antenna loss regardless tuned or

What can be proven is that the inductive reactance is cancelled out in the case of the tuned loop, but not the untuned loop. I'm not sure what definition of "efficiency" you are using, but a tuned

Rick, The efficiency will be the same for tuned or untuned small loop antennas because neither radiation resistance nor loops ohmic loss can be changed...unless you can prove otherwise.

You would be doing well to get 1% efficiency with a TUNED loop. For a small UNtuned loop it would be more like 0.1% efficiency or less. Rick N6RK

All, Since I have Kraus's book "Antennas for all applications" as my technical bible, I re-read the chapter 6 about loop antennas. He does not use at all in the terminology AF but *effective antenna

Hi Martin, I reviewed recent Duffy's comments in the mentioned blog. Duffy states: *AF db/m= E dBV/m - V dBv,* defining the antenna factor. It is taking without any argument regarding it. For some

A recent comment on Owen Duffy's blog regarding AF. https://owenduffy.net/blog/?p=27134 Regards, Martin

Hi Jeff For 160m? I suggest you think about the antenna described here ( https://topbandhams.com/tech-page/76-wb5wpa-1-4-wave-tuned-vertical-loop ) on the top band hams reflector.? The way WB5WPA

Hello Jeff. A small transmitting loop (STL), or mag loop for 160m is possible, but some compromises must be accepted. I built a three-turn STL for 80-160m use about 12 years ago and have had good

John, I forgot to mention in the final equation of AF Is indirectly included the aperture value of antenna through the antenna gain G because any antenna gain is dependent on its aperture

All, I see some of responders are confused about AF definition and variables that effect AF value. I did not call AF as a loss factor, only made my point about “mismatch factor” caused by

The antenna factor is strictly a function of the effective aperture of the antenna.? For a given power density the ratio of the free space impedance and the system impedance form a factor which is a

All, In recent years the use of a term called “Antenna Factor” in EMC and spectrum pollution work has become very important. There has been a great need for measuring field intensity and/or