Copies of the papers presented at, or published for DCC are available in various ways. A paper printed in the proceedings will be available for purchase in most cases in hard copy as the DCC proceedings. It will in most cases also be available as an individual paper in PDF format as a free download via a link below the abstract (where available) It may also be available on CD-ROM. A paper printed in the proceedings may not have been presented at the conference. Also a presentation at DCC may not be in the printed proceedings. In those cases it may be available on DVD, CD-ROM or as a MP3 download. Links to what is available will be on the page specific to the particular year's DCC.
The price for the TAPR and ARRL 28th Digital Communications Conference 2009 Proceedings is:
$ 20 US +applicable shipping/handling.
- Chicago, IL
- Steve Bible, N7HPR,
- Hosted by:
- Mark Thompson, WB9QZB
- Kermit Carlson, W9XA
28th ARRL and TAPR Digital Communications Conference
October 25-27, 2009
- A PS/2 Keyer: Using Keyer Paddles to Emulate a PS/2 Keyboard and Mouse
by David Bern W2LNX - Montgomery College, Rockville, Maryland
This paper describes my experience learning to program a
Microchip PIC® microcontroller in C. The program for this
project emulates a PS/2 keyboard and a PS/2 mouse using CW
keyer paddles for input.
- Universal Ham Radio Text Messaging - - A Programming Opportunity for TAPR
by Bob Bruninga WB4APR
Although most people think of Text Messaging as a recent phenomenon, they do not realize that amateur radio has had text
messaging for over a century. This was recently well demonstrated on the Tonight Show with Jay Leno when two old hams
using CW beat the socks off of two hip teenagers using text messaging on their cell phones.  Even though CW has yielded
some turf to newer digital modes, amateur radio still relies heavily on an abundant tool box of instant text messaging
capabilities. I recently counted over two dozen such systems currently active on amateur radio.
The purpose of this article (a shortened version appeared in the September, 09 QST) is to not just review this broad
capability, but in so doing, to inspire us to write interfaces and middleware to tie these systems together where possible to
meet the following objective:
Anytime, anywhere using any device, any ham can send a text message to any other ham by callsign alone using any
digital device he may have in his immediate possession.
- Matched Filter and Maximum a Posteriori Detector for Amateur Radio Digital Modes
by Rob Frohne KL7NA and Mark Priddy KE7UFF - Walla Walla University
This paper describes a method of demodulating a digital signal that takes into account a priori
probabilities of letters being sent to calculate posteriori probabilities of the letters given
what was received. The letter with maximum probability can be chosen as the detected letter. The
probabilities that the correct letter was chosen, given the signal received, can be useful for
features like probability squelch and color coding letters with their probabilities so that better
estimates of words received can be made by the human operator.
- VSC-X: Using ZigBee to Implement a Virtual Serial Cable for Remote Programming of Mobile Radios
by John A. Hansen, Ph.D.,W2FS
XBee-Pro is a relatively high power ZigBee-based module. This paper describes how to use these
modules to create a virtual serial cable, allowing users to program their mobile radios remotely.
- Serious RTTY contesting and the SO2R concept in 2007
by Kari Hirvonen OH2BP
In case you're a good SO1R RTTY
operator and look for a significant improvement,
you should seriously consider to take a further
step forward to SO2R in order to maximize your
This report shows one example how to set up a
serious Contesting Station using full size SO2R.
This OH2BP is designed to serve mainly the
RTTY mode, however all ideas and presented
technology works fine for CW and SSB, too.
- Planning a Digital-ATV Station for DVB-S
by Ken Konechy W6HHC and Robbie Robinson KB6CJZ - Orange County Amateur Radio Club (OCARC)
Most ham radio Amateur Television (ATV) stations and repeaters in use today still utilize
analog technology. The purpose of this paper is to explain Digital-ATV (DATV) to other hams,
with the hope that it might make the transition from analog-ATV to Digital-ATV a little more
straightforward. The paper begins with a review and comparison of various commercial DTV standards that are
in use around the world. A top-down design methodology session is then conducted to sort
through a number of design alternatives to plan a DATV station. The planning session chooses
the DVB-S standard for DATV over the competing United States-based ATSC standard. The
paper concludes by describing the Forward-Error-Correction factors and Symbol-Rate factors
that determine the RF bandwidth for a DVB-S DATV station.
- Digital Television – the new Ham frontier
by Art Towslee WA8RMC - Amateur Television of Central Ohio (ATCO)
Digital television in the USA came into being commercially in the early 90’s. Since then the official
transition to all digital didn’t take place till June of 2009. Amateur television started somewhere around
2000 mainly in Europe with on the air signals not appearing until around 2002 when some digital board
sets became available. Since then amateur repeaters in Europe have been increasing in popularity but
sadly lacking in the USA. In January of 2004 the ATCO Group in Columbus, Ohio installed a DVB-S
digital output to their repeater which has been in service 24-7 since then. As of July 2009, the ATCO
Group is the only one in the USA with a repeater digital ATV output.
- HOW DOES AN SDR TRANSCEIVER WORK?
by Patrick Lindecker F6CTE
This paper will describe an SdR transceiver, from an algebraic point of view (simple
mathematics). Following are several principle electronic diagrams and two snapshots of
the Multipsk SdR demodulator/modulator.
- WRC-12 Agenda Item 1.19: Shaping the International Regulatory Framework for Software Defined and Cognitive Radio Systems
by Brennan T. Price N4QX - ARRL, the national association for Amateur Radio
World Radiocommunication Conferences, held roughly every four years, convene to consider
amendments to international regulations and spectrum allocations necessary to accommodate new
technologies and applications. The agenda for the next WRC, scheduled for January 23-February 17,
2012, in Geneva, invites delegates "to consider regulatory measures and
their relevance, in order to
enable the introduction of software-defined radio and cognitive radio systems, based on the results of
ITU-R studies . . . ." Some of the issues being considered in these
studies are discussed.
- Experiments with Delay and Disruption Tolerant Networking in AX.25 and D-Star Networks
by John Ronan EI7IG, Kristian Walsh - Waterford Institute of Technology and Darren Long G0HWW
This paper examines the performance of DTN bundling layers against native protocols for radio data network
with a view to possible deployment for emergency communications purposes. The authors conducted experiments
with an existing DTN convergence layer in both AX.25 point-to-point and D-Star multi-hop communications
links with hidden transmitters. The experimental results show that the DTN system exhibits marginally better
performance than TCP/IP, appears to perform better where there are hidden transmitters, and has a more compact
link utilisation pattern than TCP/IP. However, situations where obvious improvements can still be made were
- Comparing 2-Meter Packet Radio Data Unicasts and Multicasts
by Paul D. Wiedemeier, Ph.D., KE5LKY - The University of Louisiana at Monroe, Computer Science and Computer Information Systems Department
Fairs, concerts, marathons, and festivals are public events where the local amateur radio club often
assists the sponsoring organization(s) by providing communication services. These celebrations
however, can be tarnished if a parent cannot find their child or a child cannot find their parent(s).
During such situations, one site orally broadcasts the description of the child to all other sites
participating a directed network. Unfortunately, oral descriptions can be ambiguous. A solution would
be to transmit a digital image of the child along with the oral description. If all sites participating in a
directed network have packet radio stations, then an optimal data transmission method would be for one
site to transmit the digital image to all other sites simultaneously. This type of transmission is referred
to as multicast and our data show that multicast file transfer tools should be used by the amateur radio
community when transmitting digital data, imagery or otherwise.
DVDs of the presentations at the 28th DCC are available: