[DARARepeater] Thursday Night Group

[George]

Ron Decker,  KC8DSC, SK

HF - UHF Antenna Analyzer UPDATE  

Projects

** License Exam Questions of the week

The Thursday Night Group will meet

Thursday, JAN 3 at 7:00 pm at the DARA Clubhouse.

------------------------------------------------------

Things this week:  

 

1.        Ron Decker,  KC8DSC, SK

Ron was a TNG for many years.  Ron Decker passed away on 28 Dec 2018.  A
Mass of Christian Burial will be held at 10:00 am on Thursday, January 3,
2019 at St Helen Catholic Church, 5100 Burkhardt Rd., Riverside.

2.        HF - UHF Antenna Analyzer UPDATE  

Phil, and maybe Rubin, will give an update on this project.

3.        ** License Exam Questions of the week

One question is drawn from each of the three question pools. Steve, AE8AT,
is providing these questions.  Thanks Steve

 

Answers are at the end of this email.

 

We received a question regarding the strange mix of letters and numbers that
begin each question.  Every exam question has a unique combination of
letter-number-letter-number.  The first letter is a T, G, or E to identify
the question pool: Technician, General, or Extra.  Next is a single number
representing the category, for example, category zero is safety in all three
exam pools.  The first letter-number pair is called the "sub-element".   The
second letter is a "group" containing related questions.  Example,
sub-element G8 is Signals and Emissions, with group C of that sub-element
being Digital Emission Modes.  The questions are numbered sequentially:
G8C01, G8C02, and so forth always with a 2-digit number at the end.  The
question identity is included in case of a typo or some "help" from
autocorrect obscures either the question or the answer.  

 

Section 9 of the question pools is Antennas and Feedlines.  Each Technician
exam has 2 questions, each General exam has 4 questions, and each Extra exam
has 8 questions on Antennas or Feedlines.  The question pools contain 23,
58, and 113 questions for the Technician, General, and Extra pools,
respectively.  

 

T9B01  Why is it important to have low SWR when using coaxial cable feed
line?

A. To reduce television interference

B. To reduce signal loss

C. To prolong antenna life

D. All of these choices are correct

G9C19  How does antenna gain stated in dBi compare to gain stated in dBd for
the same antenna?

A. dBi gain figures are 2.15 dB lower then dBd gain figures

B. dBi gain figures are 2.15 dB higher than dBd gain figures

C. dBi gain figures are the same as the square root of dBd gain figures
multiplied by 2.15

D. dBi gain figures are the reciprocal of dBd gain figures + 2.15 dB

E9F09  What is the approximate physical length of a solid polyethylene
dielectric coaxial transmission line that is electrically one-quarter
wavelength long at 7.2 MHz?

A. 10 meters

B. 6.9 meters

C. 24 meters

D. 50 meters 

 

4.        Projects

Bring something to work on.   What you building?

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, JAN 3 at 7:00 PM.

Everyone is invited!!! 

 

 

Answers:

T9B01 = B.

G9C19 = B.

E9F09 = B.  Convert 7.2 MHz over to its wavelength (300 divided by 7.2 MHz),
which yields 41.67 meters.  This question asks for the quarter wavelength
(41.67 divided by 4), which is 10.4 meters.  A radio wave traveling in a
wire moves more slowly than it will in free space, a concept call the
velocity factor.  The velocity factor for solid polyethylene coax is 0.66,
so 6.9 meters (10.4 meters times 0.66) is the best answer.   

 

Quiz 21

 

 

 

 

 

 

 



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