[DARARepeater] Thursday Night Group

[George]

Clean-up 

HF - UHF Antenna Analyzer UPDATE  

Projects

** License Exam Questions of the week

The Thursday Night Group will meet

Thursday, Feb 28 at 7:00 pm at the DARA Clubhouse.

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Things this week:  

 

1.        Clean-up

This week we will start cleaning up and deciding what to get rid of at the
DARA Auction.  Please come help

2.        HF - UHF Antenna Analyzer UPDATE  

Phil is working on the software to match the new board

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.  

 

The topic for this week also happens to be an answer to one of the
questions, so you just have to jump right in this week!

 

T7A03 Which of the following is used to convert a radio signal from one
frequency to another?

A. Phase splitter

B. Mixer

C. Inverter

D. Amplifier

G8B07 What is the frequency deviation for a 12.21 MHz reactance modulated
oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?

A. 101.75 Hz

B. 416.7 Hz

C. 5 kHz

D. 60 kHz

E7E08 What are the principal frequencies that appear at the output of a
mixer circuit?

A. Two and four times the original frequency

B. The sum, difference and square root of the input frequencies

C. The two input frequencies along with their sum and difference frequencies

D. 1.414 and 0.707 times the input frequency

4.        Projects

Bring something to work on.   What you building?

DARA Home Brew night May 3rd. so get busy!!

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 evening's.

Everyone is invited!!! 

 

 

Answers:

T7A03 = B.

 

G8B07 = B.  This isn't bad once you break down the question.  A VHF or UHF
radio will have an oscillator running at a lower frequency than the
transmitted carrier frequency.  The oscillator is at 12.21 MHz.  The
transmitted frequency is 146.52 MHz, the National simplex calling frequency.
To get from 12.21 MHz up to 146.52 MHz, multiply by 12.  When the carrier
frequency is multiplied, the deviation is also multiplied.  The 5kHz
deviation at 146.52 MHz has been multiplied, so to find the deviation before
the multiplier, divide the 5kHz by 12, arriving at 416.7 Hz.

 

E7E08 = C.

 

Quiz 29

 



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