[DARARepeater] Thursday Night Group

[George]

TNG – TV Antennas measurements

Projects 

** License Exam Questions – 225

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The Thursday Night Group will meet IN PERSON

Thursday, Feb 9, 2023 

Speakers and any announcements will start about 7:30.

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Things this week:  

TNG – TV Antennas measurements

Last week Tom did some comparison signal measurements on the antennas George brought in.  this week we are hoping to do some measurements outside, maybe before 7pm, to see how they do.  Tom will also bring a 4 bay TV antenna he is thinking about putting up at his house.  if you have one, commercial or homebrew, please bring it to do a comparison.

 

Even though masks are not required feel free to wear a mask if you feel more comfortable.  There will be some wearing mask so you will not be the only one.

 

PLEASE if you are having any of the COVID or FLU symptoms DO NOT come to the clubhouse.


Projects 

Keep working on your projects at home OR bring them with you to TNG and do them there.   

** License Exam Questions – 225

If the hint in last week’s quiz led you to believe this week’s topic would be antennas, pat yourself on the back and put a gold star next your name! 

 

T9A03 Which of the following describes a simple dipole oriented parallel to Earth's surface?

A. A ground-wave antenna

B. A horizontally polarized antenna

C. A travelling-wave antenna

D. A vertically polarized antenna

 

G9B07 How does the feed-point impedance of a 1/2 wave dipole antenna change as the antenna is lowered below 1/4 wave above ground?

A. It steadily increases

B. It steadily decreases

C. It peaks at about 1/8 wavelength above ground

D. It is unaffected by the height above ground

 

E9A01 What is an isotropic antenna?

A. A grounded antenna used to measure Earth conductivity

B. A horizontally polarized antenna used to compare Yagi antennas

C. A theoretical, omnidirectional antenna used as a reference for antenna gain

D. A spacecraft antenna used to direct signals toward Earth

 

For more information about B-Road Thursday Evening Group Projects…

Go to W8BI homepage ( <http://www.w8bi.org> http://www.w8bi.org) under Education, Thursday Group.

Or

Go to ( <https://sites.google.com/site/darathursdaynite/> https://sites.google.com/site/darathursdaynite)

There is a lot of information on this web site with additional content.

Hope to see you on Thursday evenings.

Everyone is invited!!! 

 

 

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Answers:

T9A03 = B.

G9B07 = B.

E9A01 = C.

 

Quiz 225

 

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