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This proceeding is available on CD-ROM

Location:

Cincinnati, Ohio

Coordinators:

Hank Greeb, N8XX, Local Host Liaison

John Ackermann, N8UR, Local Host Liaison

Hosted by:

Greater Cinti Amateur Radio Assn.

DIAL Radio Club

Miami Valley FM Association

Southwest Ohio Digital Symposium

Read the conference story with audio and photos.

APRS in Hollywood - Integrating Real Time 3D Graphics with Wireless GPS systems
by Phil Brock, Bill Kovacs, and Darryl Smith VK2TDS

Abstract: This paper describes the integration of a real time wireless GPS/GIS system with high end real time 3D computer graphics. It describes some of the infrastructure required for such a system, and the work required for implementation.

Both Way Radio Internet Email
by John Blowsky, KB2SCS

Abstract: BWRIE is a software system that allows the user to send and receive Internet Emails via Amateur Packet Radio. BWRIE consists of two plain vanilla AX25 packet radio stations. One station runs my "Send" software the other runs my "Receive" software. The Receive station also has an Internet connection. A Full Time or Dial Up connection, either will work.

uWeatherTM - An APRS-compatible weather station
by David R. Andersen, K0RX

Abstract: In this paper, I describe an APRS-compatible, single-board weather station project that I have developed. The weather station is based on the Microchip 16F877 microcontroller. The basic weather station monitors temperature, relative humidity, and barometric pressure. These data are periodically formed into APRS weather packets sent using on-board AFSK generation. Thus, no TNC is required to transmit the weather packets over the air. In addition, the data are sent in industry-standard "datalogger" format out the serial port for use with any of several weather station monitoring programs. Future plans call for implementing the ability to upgrade the weather station by attaching an optional rain gauge and/or anemometer. Any rain gauge that emits a TTL pulse for each 0.01 inch of rain received as well as the Dallas Semiconductor 1-wire anemometer will work with mWeatherTM.

HF Digital Voice Transmission using an OFDM Modem with Space-Time Coding
by Matt Ettus, N2MJI

Abstract: he High-frequency (HF) radio channel presents a unique challenge to the modem designer. It is characterized by large delay-spreads, rapid fading, and impulse noise. Those modems which have been successful in this environment have relied heavily on time-diversity (through coding and interleaving), or very low bit rates. However, long interleaver delays are not tolerable in a two-way voice contact, and so some other means of improving reliability is necessary if digital voice traffic is to be accommodated.
This paper discusses the design of a digital voice HF modem which uses orthogonal frequency division multiplexing (OFDM), some time referred to as a "parallel-tone" modem. While OFDM provides some frequency diversity, there is not inherent time diversity. In order to make up for this, spatial diversity is used, both on the transmit and on the receive sides.

Digital Amateur TeleVision (D-ATV)
by Thomas Sailer, HB9JNX/AE4WA, Wolf-Henning Rech, DF9IC/N1EOW, Stefan Reimann, DG8FAC, Jens Geisler, DL8SDL

Abstract: In this article, we present a Digital Amateur TeleVision (D-ATV) transmission system. Its signal can be received by cheap set-top boxes available for approximately US$100. It offers a wide user-selectable trade-off between signal bandwidth and picture quality, and at 4.5 MHz

Revisiting the TNC firmware
by Joachim Elen, ON1DDS

Abstract: his paper describes the implementation of a bridge in a TNC. By letting a TNC make the translation between AX.25 and a popular link layer protocol, countless new possibilities arise. Supporting SLIP or PPP would allow us to transparently attach our TNC to any device with a serial port, from personal computer to mobile handset. Users without specialized knowledge can start using complex network protocols like TCP/IP over radio frequencies as they do on the Internet. This way, new networking technologies can be adopted or developed by radio amateurs.

TCP/IP and radio amateurism - A UBA-RST TCP/IP TaskForce project
by Gert Leunen, ON1BLU

Abstract: Although several reports on TCP/IP projects have already been published, we felt our specific approach and vision could still figure as a contribution to the subject. The approach we will present here is one that addresses nearly all aspects of the network infrastructure (from hardware solutions, through network topology, up to services), focuses on transparency to the user and provides INTERACTION with legacy as opposed to PORTING legacy into TCP/IP.

Deconvolution in Communications Systems
by Doug Smith, KF6DX

Abstract: QEX Set/Oct 2001 Reprint. A fancy name for a DSP process that can reveal details of wave propagation paths without prior knowledge of their nature. Multipath and other distortions may be detected and corrected to some extent with thie technique. It's also useful in DSP filter design. Come discover how it's done.