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Publications:

ARRL and TAPR 24rd DCC 2005

General notes:

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.

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Location:
Santa Ana, CA


Read the conference story with audio and photos.


Abstracts:
24th ARRL and TAPR Digital Communications Conference
September 23-25, 2005


Open Source Software Licensing: Theory and Practice
by John Ackermann N8UR
Abstract: Open Source is the opposite of the proprietary model of software development. As its name implies, Open Source software is developed through an open process made possible in large part by the Internet. It is shared, and licensed, in source code form, and people are free to modify it as they choose. It is normally, but not invariably, made available to users at no charge. Before talking more about Open Source, which is a development philosophy, it.s important to describe the idea of .Free Software. which is a political philosophy. And that political philosophy drives the license that lawyers love to argue about, the General Public License . the .GPL., on which most of this paper will focus.

Proceeding Paper

PIC-E Plus: Updating a Classic
by Gary Box N0JCG
Abstract: This paper expands on the PIC-Encoder concept by porting the software from the original project to the recently released PIC 18F4550. The result is an expanded PIC-E with more flash and RAM memory, a USB interface, and enough horsepower to directly implement software defined modem functions.

Proceeding Paper

APRS-PSK63 For Improved Performance and Noise Immunity on HF Radio
by Ken Chong WB6MLC and Bill Prats K6ACJ - HFPack/APRpack HF Portable Group
Abstract: APRS (Automatic Packet/Positioning Reporting System) developed by Bob Bruninga, WB4APR, has become extremely popular worldwide. Over the years there has been tremendous growth in VHF digipeating, the APRS Internet Network, and recently UHF 9600 bps experimental nodes are making a comeback. HF APRS hasn.t changed much since the 90.s with Bell 102 tones still in use. At last, a simple way was found to link WinAPRS with a resurrected PSK31 TCP/IP Server upgraded for double speed. APRS-PSK63 (including QPSK63) is now possible with WinAPRS, as well as UIVIEW. Readers of this article will be able to setup their own APRS-PSK63 HF nodes. On-the-air trials have been very promising with improved performance and noise immunity!

Proceeding Paper

Digital Mode CCW
by Patrick Lindecker F6CTE
Abstract: In this paper, I will describe the digital mode "CCW" ("Coherent CW" Morse keying). Newcomers not required to copy CW as part of their test could find an initiation to CW and "old CW hands" could find interest in this mode." This mode is available in the Multipsk "freeware" program, downloadable from the following WEB site: http: //members.aol.com/f6cte/

Proceeding Paper

Digital SSTV: General Objectives of the Compression and Picture Transmission Protocol "Run" - Version 1
by Patrick Lindecker F6CTE
Abstract: In this paper, I describe a digital picture transmission protocol named .Run. which has the main originalities, in one hand, to be able to be included in a text and, in the other hand, to be able to be decoded at any moment when the transmission is in progress. The transmission modes supporting, at present, this protocol are Packet (300 and 1200 bauds), PSK63F and PSK220F. The software abling this functionality is called .Multipsk., it is downloadable from the author WEB site: http://members.aol.com/f6cte/ At the end of this paper, are presented some snapshots of the program.

Proceeding Paper

Eliminating Digipeater (Source) Routing from AX.25
by Peter Loveall, AESPL
Abstract: Evolving AX-25 consensus opinion is that repeater chaining belongs to a higher protocol layer. Consequently, it is being phased out of Layer 2, although backward compatibility is being maintained with a limit of two repeaters. Note that it was the original intent and continues to be the intent to eliminate repeater chaining from the link layer. I published the first version of the No-Source-Route (NSR) algorithm for UI digipeaters in the Winter 2005 PSR.

Proceeding Paper

A Spread-Spectrum Mode for HF
by Antonino Porcino IZ8BLY
Abstract: A new HF-oriented digital mode which exploits the possibilities offered by Spread Spectrum modulations is presented. This new mode, called .Chip64., tries to solve the compromise between low baudrates and phase instability of traditional narrow band modes by implementing a Direct Sequence Spread Spectrum architecture. This implementation of Spread Spectrum has been downsized to fit the limits of HF channels. Real experimentation with this new mode is possible with a software for PC and soundcard developed by the author and freely distributed.

Proceeding Paper

Visualizing APRS Messaging with HEML
by Dr. Bruce Robertson VE9QRP and Kevin Green - Mount Allison University, Canada
Abstract: This paper describes a webaccessible computer program which generates timelines and animated maps from APRS messaging data extracted from the APRSworld database.

Proceeding Paper

The KF6XA to W3NRG 10 Meter PropNET Experiment, Comparison of Summer Versus Winter Profiles, Six Meter Path also Confirmed
by Ed Sack W3NRG - Tucson Amateur Packet Radio Corporation
Abstract: As an active member of the PropNET system, W3NRG has recorded thousands of ten meter transmissions from fellow PropNET participant, KF6XA over the past four years. What makes these measurements interesting is that the path between the stations would not usually be considered "consistently viable" for 10-meter communications. A model for the transmission path has been proposed and winter and summer reception profiles compared. Recently, KF6XA and W3NRG have been able to show that the path is also viable on 6 meters, in verification of World War II research in the same area.

Proceeding Paper

Google Earth, Applications for Ham Radio
by Darryl Smith VK2TDS
Abstract: Applications for maps and mapping software have increased exponentially in the last few years. With the increased availability of wireless data links and cheap GPS receivers have come applications that could only be dreamed of a decade ago. To support this infrastructure, Google have released a digital terrain model of the earth with superimposed aerial photographs with an open interface for adding all sorts of information on top of this model. This paper looks at the Google Earth product and some applications to Ham Radio.

Proceeding Paper

Integrated Map Data for Real Time Use
by Mark Sproul KB2ICI
Abstract: APRS has been around for over 10 years; there are many versions of software that support the on-air protocol. The primary difference between the various programs besides user interface style is the mapping. Map detail and map information is a very important part of the APRS environment. Early on, computer capabilities were the limiting factor for good maps. Data was available, but it was very large and the computers did not have the memory or the speed to deal with it directly. Therefore short cuts had to be taken. Now the speed and memory of even today.s laptops can handle very large amounts of data, download it in near real time and display very detailed information. With the speed and capacity of current desktop and laptop computers, not only can we handle very detailed maps, but we can simultaneously display data from multiple sources such as roads, elevation, and imagery, all integrated seamlessly.

Proceeding Paper

Software Defined Radios for VHF Through SHF
by Gerald Youngblood, K5SDR - FlexRadio Systems
Abstract: The FlexRadio Systems. SDR-1000 is the first commercially available Software Defined Radio (SDR) transceiver for the amateur radio market. The SDR-1000 began shipping in April of 2003 with GPL open source software, a first for a commercial transceiver. This has created a groundswell of support for the radio from contributors worldwide. This is evidenced by the constant improvement available through free software downloads on almost a weekly basis. These enhancements are well documented in the October 2005 QST product review, .FlexRadio Systems SDR-1000 HF+VHF Software Defined Radio Redux.. The current SDR-1000 now boasts dynamic range performance that meets or exceeds that of radios costing ten times its cost.

Proceeding Paper

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