[DARARepeater] Thursday Night Group

Tue Jul 9 03:18:18 EDT 2019

YAGI Antenna workshop part 6 - THIS WEEK!!

Upcoming Hamfest

Also a heads up - NO MEETING July 18 (ARRL Teachers Institute)

Projects

** License Exam Questions of the week

The Thursday Night Group will meet

Thursday, July 11 at 7:00 pm at the DARA Clubhouse.

Also a heads up - NO MEETING July 18 (ARRL Teachers Institute)  

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

Things this week:  

1. YAGI Antenna workshop part 6  

Please come even if you have not attended the other sessions.  Lots of stuff
to learn. Just observing is fine; attendees do not have to build a Yagi.

Join us for a Build-It: Yagi Antenna Workshop. This multi-session series
will focus on yagi antennas the vhf/uhf frequency bands, including designs
for ATV and EME. But HFers will also gain by attending.

I. Selecting Your VHF/UHF Yagi Antenna Design - WA8OGS/Joe

.       Use VE7BQH antennas tables (50, 144,432 MHz)

.       Example: https://www.dxmaps.com/VE7BQH.html 

II. Selecting Your Yagi Antenna Design - W8RKO/Mike

.       Software Tools - A Review

III. Driven Elements for 144/432/1296 MHz - Explore Matching & Bandwidth

.       Using Pocket VNA - WA8OGS/Joe

.       Using Agilent N9912 FieldFox (Verify) - N8ZM/Tom & W8RKO/Mike

IV. Group Parts Order - Open Discussion - N8ZM/Tom

.       Free Boom Material: 1" O.D., .040" wall Aluminum from WA8OGS/Joe

V. What Next - Start Building Your Yagi - N8ZM/Tom

VI. FINAL SESSION - ANTENNA GAIN MEASUREMENTS & PICNIC

       Save the Date: Saturday, August 24

Here is the proposed schedule:

Build-It: Yagi Workshop Series

.             Antenna Overview (Joe, WA8OGS)
March 21 - completed

.             Balun Overview, and testing baluns (Mike, W8RKO)
April 4 - completed

.             Driven Element Options (Joe, WA8OGS)
April 18 - completed

.             Selecting Your Build-It Yagi (Joe, WA8OGS)
May 2 - completed

.             Antenna Modeling (Mike, W8RKO)
June 6

.             Start your Yagi design using software - Hands On
July 11

.             Start Building - Hands On (group)
TBA

.             Tuning & Testing Your Yagi (Tom, N8ZM, & group)
TBA

.             Antenna Gain Measurements [maybe on a Saturday, 10am-2pm;
include

lunch?] (Tom, N8ZM, & group) 

Many thanks to Joe Burke, WA8OGS, and Mike Suhar, W8RKO, who have put this
together.

2. Upcoming Hamfest 

            07/21/19                      http://w8fy.org <http://w8fy.org/>

Van Wert Hamfest

08/03/19                      http://www.columbushamfest.com
<http://www.columbushamfest.com/>  

Columbus, Ohio Hamfest

08/04/19
https://www.w8dyy.org/event/mara-3rd-annual-swap-meet/?instance_id=7890 

MARA (Miamisburg) Swap Meet

08/17/19

Germantown Amateur Radio Society Hamfest

3. July 18 - NO TNG 

NO MEETING July 18 (ARRL Teachers Institute)  

4. Projects

Bring something to work on.   What you building?

5. 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.  

Quiz theme this week is also an answer, so everyone should be able to get at
least one correct this week!

T6B02 What electronic component allows current to flow in only one
direction?

A. Resistor

B. Fuse

C. Diode

D. Driven element

G6A05 What is the approximate junction threshold voltage of a conventional
silicon diode?

A. 0.1 volt

B. 0.3 volts

C. 0.7 volts

D. 1.0 volts

E6A03 Why does a PN-junction diode not conduct current when reverse biased?

A. Only P-type semiconductor material can conduct current

B. Only N-type semiconductor material can conduct current

C. Holes in P-type material and electrons in the N-type material are
separated by the applied voltage, widening the depletion region

D. Excess holes in P-type material combine with the electrons in N-type
material, converting the entire diode into an insulator

     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:

T6B02 = C. (While this is the special role diodes fulfill and the best
answer among the choices, there is a nuance here that may confuse those
studying for a higher license class.  The reverse breakdown voltage of a
diode is the voltage required to force the diode to flow current "backwards"
and there are useful circuits that make use of this.)

G6A05 = C.

E6A03 = C.

 Quiz 48

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