QEX №5 2014.pdf

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The national association for
ARRL
AMATEUR RADIO
225 Main Street
Newington, CT USA 06111-1494
TM
$
5
Nothing But Performance
The TS-590S
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section sports IMD (intermodulation distortion) characteristics that are on par with those "top of the line"
transceivers, not to mention having the best dynamic range in its class when handling unwanted, adjacent
off-frequency signals.*
•
HF-50MHz 100W
•
Digital IF Filters
•
Built-in Antenna Tuner
•
Advanced DSP from the IF stage forward
•
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•
Heavy duty TX section
•
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Customer Support:
(310) 639-4200
Fax: (310) 537-8235
ADS#36812
* For 1.8/3.5/7/14/21 MHz Amateur bands, when receiving in CW/FSK/SSB modes, down conversion is automatically selected if the final passband is 2.7KHz or less.
Scan with your phone to
download TS-590S brochure.
September/October 2014
About the Cover
QEX (ISSN: 0886-8093) is published bimonthly
in January, March, May, July, September, and
November by the American Radio Relay League,
225 Main Street, Newington, CT 06111-1494.
Periodicals postage paid at Hartford, CT and at
additional mailing offices.
POSTMASTER: Send address changes to:
QEX, 225 Main St, Newington, CT 06111-1494
Issue No 286
Harold Kramer, WJ1B
Publisher
Larry Wolfgang, WR1B
Editor
Lori Weinberg, KB1EIB
Assistant Editor
Zack Lau, W1VT
Ray Mack, W5IFS
Contributing Editors
Production Department
Steve Ford, WB8IMY
Publications Manager
Michelle Bloom, WB1ENT
Production Supervisor
Sue Fagan, KB1OKW
Graphic Design Supervisor
David Pingree, N1NAS
Senior Technical Illustrator
Brian Washing
Technical Illustrator
Advertising Information Contact:
Janet L. Rocco, W1JLR
Business Services
860-594-0203 – Direct
800-243-7768 – ARRL
860-594-4285 – Fax
Circulation Department
Cathy Stepina,
QEX Circulation
Offices
225 Main St, Newington, CT 06111-1494 USA
Telephone: 860-594-0200
Fax: 860-594-0259 (24 hour direct line)
e-mail:
qex@arrl.org
Subscription rate for 6 issues:
In the US: ARRL Member $24,
nonmember $36;
US by First Class Mail:
ARRL member $37, nonmember $49;
International and Canada by Airmail: ARRL member
$31, nonmember $43;
Members are asked to include their membership
control number or a label from their QST when
applying.
In order to ensure prompt delivery, we ask that
you periodically check the address information on
your mailing label. If you find any inaccura-
cies, please contact the Circulation Department
immediately. Thank you for your assistance.
Copyright © 2014 by the American
Radio Relay League Inc. For permission
to quote or reprint material from
QEX
or any ARRL publication, send a written
request including the issue date (or
book title), article, page numbers and a
description of where you intend to use
the reprinted material. Send the request
to the office of the Publications Manager
(permission@arrl.org).
Thomas Alldread, VA7TA, describes a
Bluetooth Wireless Link in Part 3 of his “Android
Wireless Control Project.” Tom uses the Bluetooth
link to connect his Android tablet to his NimbleSig
III RF Signal Generator. His tablet can then control
the signal generator to perform tests and collect
measurements.
In This Issue
Features
3
13
25
31
38
39
Android Wireless Project Control: Part 3 —
Example Application
Thomas M. Alldread, VA7TA
Calibration and Monitoring of Frequency Standards
— Phase Method
Jim Satterwhite, K4HJU
Digital Signal Processing (DSP) Projects: Examples of
GNU Radio and GRC Functionality
John Petrich, W7FU and Tom McDermott, N5EG
Hands-On-SDR
Scotty Cowling, WA2DFI
Letters
Upcoming Conferences
Index of Advertisers
ARRL: ................................................Cover III
Array Solutions: .......................................... 40
Down East Microwave Inc:.......................... 12
Kenwood Communications: ................Cover II
M
2
:............................................................... 24
Nemal Electronics International, Inc: ...........30
Quicksilver Radio Products............... Cover IV
RF Parts:............................................... 37, 39
Tucson Amateur Packet Radio: .................. 40
QEX – September/October 2014
1
The American Radio
Relay League
The American Radio Relay League,
Inc, is a noncommercial association
of radio amateurs, organized for the
promotion of interest in Amateur Radio
communication and experimentation,
for the establishment of networks to
provide communications in the event of
disasters or other emergencies, for the advancement
of the radio art and of the public welfare, for the
representation of the radio amateur in legislative
matters, and for the maintenance of fraternalism and
a high standard of conduct.
ARRL is an incorporated association without
capital stock chartered under the laws of the state
of Connecticut, and is an exempt organization
under Section 501(c)(3) of the Internal Revenue
Code of 1986. Its affairs are governed by a Board
of Directors, whose voting members are elected
every three years by the general membership. The
officers are elected or appointed by the Directors.
The League is noncommercial, and no one who
could gain financially from the shaping of its
affairs is eligible for membership on its Board.
“Of, by, and for the radio amateur,” ARRL
numbers within its ranks the vast majority of active
amateurs in the nation and has a proud history of
achievement as the standard-bearer in amateur
affairs.
A
bona fide
interest in Amateur Radio is the only
essential qualification of membership; an Amateur
Radio license is not a prerequisite, although full
voting membership is granted only to licensed
amateurs in the US.
Membership inquiries and general corres-
pondence should be addressed to the
administrative headquarters:
ARRL
225 Main Street
Newington, CT 06111 USA
Telephone: 860-594-0200
FAX: 860-594-0259 (24-hour direct line)
Officers
President:
KAY C. CRAIGIE, N3KN
570 Brush Mountain Rd, Blacksburg, VA 24060
Chief Executive Officer:
DAVID SUMNER, K1ZZ
The purpose of
QEX
is to:
1) provide a medium for the exchange of ideas and
information among Amateur Radio experimenters,
2) document advanced technical work in the Amateur
Radio field, and
3) support efforts to advance the state of the
Amateur Radio art.
All correspondence concerning
QEX
should be
addressed to the American Radio Relay League,
225 Main Street, Newington, CT 06111 USA.
Envelopes containing manuscripts and letters for
publication in
QEX
should be marked Editor,
QEX.
Both theoretical and practical technical articles are
welcomed. Manuscripts should be submitted in word-
processor format, if possible. We can redraw any
figures as long as their content is clear.
Photos should be glossy, color or black-and-white
prints of at least the size they are to appear in
QEX
or high-resolution digital images (300 dots per
inch or higher at the printed size). Further
information for authors can be found on the Web at
www.arrl.org/qex/
or by e-mail to
qex@arrl.org.
Any opinions expressed in
QEX
are those of
the authors, not necessarily those of the Editor or the
League. While we strive to ensure all material
is technically correct, authors are expected to
defend their own assertions. Products mentioned
are included for your information only; no
endorsement is implied. Readers are cautioned to
verify the availability of products before sending
money to vendors.
Larry Wolfgang, WR1B
Empirical Outlook
ARRL National Convention and More
I have only been to 2 or 3 previous National Conventions in my many years as an Amateur
Radio operator. With this year’s Centennial National Convention being held in Hartford,
Connecticut, I wanted to take advantage of the opportunity. Many ARRL Staff members had
spent countless hours over the course of the previous year or longer in the planning and orga-
nizing of this year’s special convention. I did not play a role in any of the planning, but I would
like to start off with congratulations to all of the staff and volunteers who made it happen! I saw
first hand some of the work and dedication involved, and recognize that all of this was in addition
to keeping up with their normal work responsibilities. My hat is off to every one of them.
I signed up for Contest University during the Thursday all-day seminar tracks. I had thought
about taking this course a few times previously, and this seemed like a perfect opportunity. I am
not a real competitive contester, nor to I dream of becoming one. I do enjoy spending some time
on the air during a contest, and challenging myself to do better from one year to the next. I also
believe that if I can learn some techniques to make my station and my operating practices more
effective, this will be a benefit in other aspects of my enjoyment of the hobby.
CTU was a very interesting program, and I enjoyed hearing from various experts in particular
aspects of station design and operation. I gained a few tips for improvements I want to make to
my station, as well as some operating tips that may help improve my scores in some of my
favorite contests. If you have even a passing interest in this aspect of Amateur Radio, I highly
recommend signing up for the course when you have an opportunity. The Dayton Hamvention
seems to be the most regular place to find it.
I was not able to attend the Convention on Friday. Some of us had to stay at the office (and
appear to be working) for those who were visiting Headquarters during the day. I had lots to do
for this issue of
QEX,
so it was best that I spent the day working, anyway! My wife Jean,
WB3IOS, and I attended the Convention Banquet on Friday evening, and we had a wonderful
time. We met and talked with quite a few other attendees, enjoyed a wonderful meal, and heard
an excellent keynote speech from Craig Fugate, KK4INZ. Later, we also attended the Royal
Order of the Wouff Hong Ceremony. This was my second time to go through the ceremony, but
Jean’s first. It is always fun. If you have not gone through a Wouff Hong Ceremony, try to attend
a Convention where it is offered, and do it.
On Saturday I got to be a “tourist” and check out the exhibit hall and take in a couple of the
forums. It was great fun to browse the various booths, drool over a few radios, and meet up with
old friends and new. The setting at the Connecticut Convention Center was one of the best that
I’ve been to. I have gone to several other programs at the Connecticut Convention Center, and
it is always nice, but it really seemed to suit the needs of our program very well. The forum rooms
upstairs were comfortable, although when I arrived at the room for one of the programs I wanted
to attend, I found only an empty space. I guess all those people heading the other way should
have been a clue, but I just guessed they were leaving a previous forum. Because of the large
number of people who showed up, the forum was moved to a larger room. I found the new loca-
tion, and ARRL Rocky Mountain Division Director Brian Mileshosky’s presentation on the
Raspberry Pi was quite informative.
A highlight for me was going to hear Joe Taylor, K1JT, talk about some of his work on JT65
and other software. It was also quite an honor to greet him and shake his hand after his talk.
There are not that many opportunities to meet and greet an Nobel Prize winning Physicist!
Introducing a New Column with This Issue
When you look at the Table of Contents for this issue you will notice an article by Scotty
Cowling, WA2DFI. Actually, this is more than
just
an article. This is the first in what we hope will
become a regular column in
QEX.
As the title indicates, Hands On SDR is intended to guide
you through the process of trying out some hardware and software that will let you experience
the wonders of software defined radio. I know that many of you are old hands at this stuff, but I
believe others have been hearing about it, and wanting to experience it, but just haven’t figured
out where to start. Scotty will take us through that process. In this issue he introduces three dif-
ferent bits of hardware and one piece of software that can control any (or all) of those three.
There are several price point options that I hope you will find attractive. Even if you don’t have
the hardware right now, Scotty will show you some of the things you can do with it over the next
several columns. We probably won’t run Hands On SDR in every issue, especially if Ray Mack,
W5IFS is able to get back to writing about some of the theoretical aspects of SDR in his SDR:
Simplified column.
I hope you find this new column fun and interesting. Let Scotty and me know what you think,
and ask him any questions you might have.
2
QEX – September/October 2014
Thomas M. Alldread, VA7TA
7056 Railway Ave, Courtenay, BC V9J 1N4, Canada;
VA7TA@telus.net
Android Wireless Project Control
Part 3 — Android Bluetooth
Wireless Link
The final installment of this series shows how to provide a wireless connection
between the tablet and the NibleSig III sweep generator.
This final part of this series will describe
the implementation of an economical
Bluetooth serial universal asynchronous
receiver/transmitter (UART) data transceiver
module for the wireless control of Amateur
Radio projects. The information here is
intended to provide a guideline for those
that wish to adopt one of these Bluetooth
data transceivers to form the basis for a
wireless control link. As described earlier, a
Bluetooth connection paves the road for the
use of a mobile device such as a Bluetooth
equipped tablet that can be used to provide a
user-friendly graphics user interface (GUI)
wireless controller.
Figure 1 — This is a component-side view of the HC-05 Bluetooth transceiver.
Bluetooth Transceiver Modules
As mentioned in Parts 1 and 2 of this
series (Mar/Apr and May/Jun 2014
QEX)
the Bluetooth (BT) link makes use of a
Bluetooth transceiver module assembly,
which is shown in Figures 1 and 2. The
overall assembly is quite small, roughly the
size of two small postage stamps stacked
end-to-end (1.5 in × 0.5 in). The transceiver
module consists of two circuit boards;
a tiny postage stamp sized motherboard
(sometimes referred to in eBay item listings
as a back board) and a wireless transceiver
daughter board. The wireless transceiver
daughter board has 34 solder contacts
around three sides of the perimeter, which
attach/connect it to the motherboard. The
motherboard also provides mounting space
for a V
CC
polarity reversal protection diode,
a 3.3 V regulator, male header pins for
external connections, a push button switch
for implementing configuration setup mode,
an LED status indicator and a few passive
Figure 2 — Here is a printed-side view of the HC-05 Bluetooth transceiver. The calipers
provide a size reference.
QEX – September/October 2014
3

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