the
VOLUME 4 ISSUE 39
JUNE 2016
WHAT IS AN INDUCTOR?
PART TWO
Inductors play a major role in electronics. Inductors vary
in value with different sizes, cores and style of the
windings.
CHECK OUT THE
THURS. NIGHT NET
WHEN THE
REPEATER IS BACK!
The club will sponsor an informal
net each week on Thursday
evenings at 8:00 PM to chat about
whatever is on your mind and to
announce upcoming Amateur
Radio and club activities. For the
net, we link the two club
repeaters together and turn off
the tone requirements, so
everyone can join in.You will find
the net on 147.270 and 448.800.
UPCOMING EVENTS
Don't forget the general meeting
on June 15th.
Want to submit an article to
Splatter? See page 2 for the
details.
Check out the website for all the
latest information about
upcoming events.
An inductor wound in a coil with only air inside the coil
relies on the wire windings only to create the inductance
characteristics. That is, the magnetic field that cuts
through the windings to produce an opposing current in
the opposite direction. This only occurs when an
alternating current is applied to the coil. This affect is
called Inductive Reactance (XL) and it is measured in
ohms like a resistor.
The Inductive Reactance, XL, changes with a change in
frequency of the alternating current. The higher the
frequency, the higher the XL value in ohms.
We can also increase reactance of a given size of coil by
using a variety of cores that go inside the coil windings.
Some of the materials are metal laminates or a large
variety of ferrite molded materials. The latter utilizes
various metal powders set in a resin. The selection of
ferrite cores is critical to the frequency applied and power
used on the inductor.
Cont’d on Page 2
PAGE 1
www.w0eno.org
VOLUME 4 ISSUE 39
The value of an inductor is measured in Henrys. A
power supply using 60 Hz will require an inductor
that can produce several henrys. This is your power
transformer.
When you work with radio frequencies, the inductors
measure milli-henrys or micro-henrys.
For example, at 100 Hz you will need a value of 1
henry to develop 700 ohms of reactance. At 1 MHz
you only need 100 micro-henrys to develop the same
resistance (1 micro-henry is 1 millionth of a henry).
When selecting a coil, the value will be given in
henrys. From this value you can determine the
reactance it will develop at the frequency you are
using it at. This can be done with a reactance chart or
by formula.
XL = 2p FL
XL = INDUCTIVE REACTANCE (OHMS)
F = FREQUENCY
L = INDUCTANCE IN HENRYS
Knowing the basic functions of an inductor will help
knowing a little more of how your station works.
73,
Ralph WD0EJA
JUNE 2016
JUNE 2016
BOARD OF DIRECTORS
President, Jerry Schmidt, N0OUW
Vice President, Sebastian Wessels, NS0W
Secretary, Starr Aldrich, KD0BZK
Treasurer, Don Lewis, KE0EE
ADDITIONAL BOARD POSITIONS
Membership, Don Lewis, KE0EE
Technical: Bob Weinstein
Splatter, Mark Mollenauer, KD0GOC
Planning: Doug Altman, KE0SI, and
Mark Mollenauer, KD0GOC
BCARES Representative, Jerry Schmidt,
N0OUW
Contact Us
E-mail to admin@w0eno.org will alert each
member of the board.
Board meetings are held on the first
Wednesday of each month at 7:00PM
Regular Club meetings are held on the third
Wednesday of each month at 7:00PM.
Both board and club meetings are held at the
Boulder County Fairgrounds Office (the Clover
building) building and are open to all.
If you have a general interest article about ham
radio that you would like to see in a future issue
of Splatter; please email it to:
markmoll14@hotmail.com
You are welcome to submit an
article for Splatter. Articles
received by the first few days of
the month will be included in the
issue for that month.
Boulder County Parks and Open Space Fair
Grounds Building
9595 Nelson Road
Longmont, Colorado 80501-6359
LARC is a non-profit organization organized
exclusively for one or more of the purposes
as specified in Section 501 (c)(3) of the
Internal Revenue Code,Vol. 17, No. 6.
Repeaters:
VHF: 147.270 MHz (+) 600 kHz *100Hz CTCSS
UHF: 448.800 MHz (-) 5 MHz *88.5 Hz CTCSS
PAGE 2
www.w0eno.org
VOLUME 4 ISSUE 39
JUNE 2016
Message From Don Lewis . . .
This will be the first year I have missed Field Day in a long time. Ruth and I are going on a trip
through Wyoming, Idaho and into Oregon during the later part of June. As we pass through
these states I intend to work the National Parks as an NPOTA activator. This will be a great
time of working as many stations as we can. We still have to work out the routes, Ruth and have
differing ideas about what this trip is about. She thinks we are going to Oregon to visit one of
her kids and I am going to visit as many National Parks as I can. She is very accommodating to
this old man.
Since we will be in Oregon during Field Day, I will be scanning the 20 meter bank to work
W0WNO. I am sure you will have a great time even though I cannot be there to work it with
you.
HOA’s have a bad rap sometimes as they relate to our antennas. I just applied to my HOA to
allow me to put up a 20 ft dual band VHF/UHF antenna at the peak of my roof and it was
approved! I did not even have to wait for congress to do their duty and pass the PRB1 for
HOAs. Trying to use the J-pole attached to the side of the house has been a very poor
performer. I had installed that several years ago and painted it the same color of the house to
hide it. It is just too close to the absorbing house materials. In my application I did explain the
emergency side of Ham Radio in my application. So, if you have a desire to put up an
antenna, go ahead and present your case. You might be able to have a positive answer and it is
always best not to say no to yourself.
* Don, KE0EE
PAGE 3
www.w0eno.org
VOLUME 4 ISSUE 39
PAGE 4
JUNE 2016
www.w0eno.org
VOLUME 4 ISSUE 39
JUNE 2016
If you click on Leader Board you will notice that Don, ke0ee, and Doug, ke0si, and Sebastian,
ns0w are listed under the Colorado park activation group. For example Don has activated one or
more parks 12 times.
If you click on Unit Statistics you will see the following screen. You can sort various tables of data
by clicking on the little white triangle.
PAGE 5
www.w0eno.org
VOLUME 4 ISSUE 39
JUNE 2016
Rocky Mountain National Park has been activated 27 times, as of June
3rd, 2016, for a total of 1779 contacts. 629 of those contacts were made
in the park by LARC members ke0ee, ke0si, and n5rs.
PAGE 6
www.w0eno.org
VOLUME 4 ISSUE 39
JUNE 2016
Top picture is ke0si and ke0ee at Fr. Laramie, Wy, over on the Eastern border.
Lower picture is our location at Lily Lake in Rocky Mountain National Park.
-
Enjoy our hobby – Doug, ke0si
PAGE 7
www.w0eno.org