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Examining Ambiguities in the Automatic Packet Reporting System
Examining Ambiguities in the Automatic Packet Reporting System A Thesis Presented to the Faculty of California Polytechnic State University San Luis Obispo In Partial Fulfillment of the Requirements for the Degree Master of Science in Electrical Engineering by Kenneth W. Finnegan December 2014 © 2014 Kenneth W. Finnegan ALL RIGHTS RESERVED ii COMMITTEE MEMBERSHIP TITLE: Examining Ambiguities in the Automatic Packet Reporting System AUTHOR: Kenneth W. Finnegan DATE SUBMITTED: December 2014 REVISION: 1.2 COMMITTEE CHAIR: Bridget Benson, Ph.D. Assistant Professor, Electrical Engineering COMMITTEE MEMBER: John Bellardo, Ph.D. Associate Professor, Computer Science COMMITTEE MEMBER: Dennis Derickson, Ph.D. Department Chair, Electrical Engineering iii ABSTRACT Examining Ambiguities in the Automatic Packet Reporting System Kenneth W. Finnegan The Automatic Packet Reporting System (APRS) is an amateur radio packet network that has evolved over the last several decades in tandem with, and then arguably beyond, the lifetime of other VHF/UHF amateur packet networks, to the point where it is one of very few packet networks left on the amateur VHF/UHF bands. This is proving to be problematic due to the loss of institutional knowledge as older amateur radio operators who designed and built APRS and other AX.25-based packet networks abandon the hobby or pass away. The purpose of this document is to collect and curate a sufficient body of knowledge to ensure the continued usefulness of the APRS network, and re-examining the engineering decisions made during the network's evolution to look for possible improvements and identify deficiencies in documentation of the existing network. iv TABLE OF CONTENTS List of Figures vii 1 Preface 1 2 Introduction 3 2.1 History of APRS . -
13. Cleveland Jazz Guitarists
13. Cleveland Jazz Guitarists itariSts who grew up in still a teenager. He joined the leveland have been among musicians' union when he was 16. By Gthe most important and most 1940, when he was 17, he was playing acclaimed in jazz history. They all at parties and country clubs around drew their inspiration from the all Cleveland. "I played with band leaders time grand masters of jazz guitar, Clint Noble and Jack Horowitz," he Django Reinhardt and Charlie said, but he had bigger plans. Christian. "In 1941, I went to New York to become famous. My father borrowed Fred Sharp $50 on his life insurance policy and Anyone who was even a casual gave me the money to go. Joe Sharp listener ofjazz in Cleveland from the never had money at all. In New York, 1940s to the '80s probably heard I put in for my union card. You had to guitarist Fred Sharp. He played with stay six months to get your card and I some ofthe biggest names in jazz and went to the union floor every day and was the man Jim Hall credited as his started to get some club dates. The teacher. scale was $7 then for a club date, but In the mid-1930s, when Sharp was most everybody paid $4." growing up in the Glenville area of Courtesy of Fred Sharp When he was still in his teens, Fred Sharp and Babik Reinhardt, Cleveland and listening to music on Sharp remembered he almost starved the 23-year-old son of Sharp's the radio, the guitar, with a few guitar idol Ojango Reinhardt, in trying to become famous in New exceptions, was not a solo jazz voice, Paris in 1967 York. -
A Short History of the Handheld Transceiver
By Gil McElroy, VE3PKD A Short History of the Handheld Transceiver CARTOON BY PHIL GILDERSLEEVE, W1CJD [FROM NOVEMBER 1948] Although today you could say “They’re everywhere, they’re everywhere!” it wasn’t always so. rom its very beginning, Amateur that could be easily carried in the hand. Wartime Spawns Designs for Radio has been an invaluable part The fantasy may have been the two-way Portable Radio Fof both emergency and civil defense radio comic book hero Dick Tracy wore In an ironic twist, it was the suspen- communications. Fifty Years of A.R.R.L. on his wrist, but the reality would be a sion of Amateur Radio during World War notes that as early as 1913, amateurs were handheld device: the handie-talkie, or II that gave what might have been the first involved in providing emergency commu- “handheld transceiver.” Easy to carry and big boost toward ham interest in and de- nications following a severe windstorm easy to use, the handie-talkie would make velopment of a truly handheld transceiver. in the Midwest. And the idea of all hams its way to every corner of the world, and WERS—the War Emergency Radio Ser- being equipped with portable rigs for even into space when Owen Garriott, vice—focused on communications strictly national defense purposes had first been W5LFL, made history when he fired up for national defense purposes, and as more proposed in the pages of QST in a letter a 2 meter handheld aboard the space and more hams became involved, the pages to the editor in the August 1916 issue. -
A Survey Paper on Half Duplex Communication Device
Vol-5 Issue-1 2019 IJARIIE-ISSN(O)-2395-4396 A SURVEY PAPER ON HALF DUPLEX COMMUNICATION DEVICE 1Handore Kanchan Gorakh 2Kakad Pallavi Changdeo 3Pansare Pooja Khandu 4Sawai Priti Kakasaheb 5Dr. K T V Reddy 1Handore Kanchan Gorakh, 2Kakad Pallavi Chandgeo, 3Pansare Pooja Khandu, 4Sawai Priti Kakasaheb, 5 Dr. K T V Reddy, Electronics & Telecommunication, SIR VISVESVARAYA INSTITUTE OF TECHONOLOGY, Maharashtra, INDIA ABSTRACT Walkie talkie is a kind of communication system which provides services one-to-one and one-to-many. A walkie- talkie is a half-duplex communication device; several number of walkie talkies use a single radio channel, at a time only one radio can transmit signal on a channel, even though any number can listen. Normally the transceiver is in receive mode; when the user wants to talk he presses a ”push-to-talk” (PTT) button that turns off the receiver and turns on the transmitter. They communicate with each other using wireless frequency band. Typical walkie-talkies correspond to a cellular phone, possibly slightly larger but still a single unit, with an antenna mounted on the top of the unit. Where a phone’s earpiece is only loud enough to be heard by the user, a walkie-talkie’s built-in speaker can be heard by the user and those in the user’s immediate neighboring. Walkie-talkie transceivers may be used to communicate between each other, or to vehicle-mounted or base stations. In our system we increases the communication distance between two devices. Keyword: - Arduino UNO, Potentiometers, Touch Switch, Speaker, Sound Sensor, Mike Module. -
Virginia Tech Ground Station TNC Interfacing Tutorial
Virginia Tech Ground Station TNC Interfacing Tutorial Zach Leffke, MSEE ([email protected]) Research Associate Aerospace Systems Lab Ted & Karyn Hume Center for National Security and Technology 3/23/2018 Agenda VHF/UHF • TNC Connection Overview 3.0m Dish Antennas • KISS Protocol 4.5m Dish • AX.25/HDLC Protocol • AFSK/FSK/GMSK Modulation • ….System Review…. • OSI Stack • Remote Connection Students assembling • VTGS Remote Interface 4.5m Dish • Summary Deployable Space@VT Ops Center 1.2m Dish GNU Radio at work (students preparing for 2016 RockSat Launch) 3/23/2018 TNC Interfacing Tutorial 2 Preview of the Finale…………… Primary Ground Station - UPEC Host Computer Client Software TNC TC SW TNC SW SoundCard AX.25 AX.25 KISS Interface KISS HDLC RADIO Localhost DATA FM TCP TCP AFSK D to A LOOPBACK IN RF Spacecraft IP IP IP IP MAC C&DH Audio Audio Comput HOST OS NETWORK RADIO er TC SW FIRMWARE AX.25 AX.25 KISS HDLC KISS AFSK SERIAL Remote Ground Station - VTGS FM SERIAL RF Host Computer Telecommand (TC) TTL Serial Software TNC TNC SW SoundCard AX.25 INTERNET KISS Interface HDLC RADIO DATA FM TCP AFSK D to A HOST IN RF OS IP NET VPN CONNECTION MAC Audio Audio Radio 3/23/2018 TNC Interfacing Tutorial 3 TNC Connection Overview TNC Implementation Types Hardware Radio DATA Jack Specific Interface Examples 3/23/2018 TNC Interfacing Tutorial 4 TNC Implementation Summary • Multiple implementation options exist • Hardware TNC Ground Station • Software TNC + Sound Card • Software Defined Radio Receiver • Software Defined Radio Transceiver • Hybrid SDR RX / HW Radio TX implementations 3/23/2018 TNC Interfacing Tutorial 5 Hardware Radios – Common for Satellite 3/23/2018 TNC Interfacing Tutorial 6 Hardware TNCs 3/23/2018 TNC Interfacing Tutorial 7 Radio Sound Card Interfaces • Good ones offer optical isolation (optocouplers). -
Softmac – Flexible Wireless Research Platform
SoftMAC – Flexible Wireless Research Platform Michael Neufeld, Jeff Fifield, Christian Doerr, Anmol Sheth and Dirk Grunwald Dept. of Computer Science University of Colorado, Boulder Boulder, CO 80309-0430 November 4, 2005 Abstract lision avoidance protocols for that network influenced the design of Ethernet. Contributions by researchers interested Discontent with the traditional network protocol stack ar- in packet radio have greatly influenced protocol designs of chitecture has been steadily increasing as new network tech- existing products. For example, the RTS/CTS mechanism nologies and applications demand a greater degree of flexi- used in the 802.11 networking standard was influenced by bility and “end to end” information than a strictly layered the MACA protocol proposed by Phil Karn [1]. structure permits. Software-defined radio (SDR) systems Recently, most of the experimentation in wireless net- have prompted some rethinking of the network stack, and working has used commodity components such as 802.11b schemes have been presented that attempt to take advan- networkingcards. This has occurred for a numberof reasons tage of the opportunities afforded by these flexible radio – these commodity networking cards are inexpensive, do not systems. However, evaluation of these schemes has largely require a license to operate, and offer good performance. taken place only in simulation or on small testbeds. In or- Furthermore there are a wealth of interesting computer sys- der to seriously evaluate the utility and efficacy of architec- tems problems facing wireless networking that occur above tures and heuristics that take advantage of SDR systems it the physical and MAC layers. Using these commodity cards is essential to construct and test these systems “in the wild,” allows researchers to build systems to investigate these prob- i.e. -
TNC-Pi a TNC for the Raspberry Pi
1/17/2015 TNC-Pi A TNC for the Raspberry Pi What is TNC-Pi • The TNC-Pi is a Terminal Node Controller for the Raspberry Pi, based on the KISS protocol. • We’ll dive into this definition shortly. • The TNC-Pi is available at tnc-x.com. • The TNC-X and TNC-Black are also available. • $40.00 for the kit, $65.00 assembled and tested. • Developed by John Hansen, W2FS • Introduced at the 2003 ARRL/TAPR Digital Communications Conference 1 1/17/2015 Terminal Node Controller • Often abbreviated TNC. • A terminal node controller consists of: • Modem – Converts a packet of data to audio frequencies and back again. • Processor – Accepts commands and data from the attached terminal, computer or Raspberry PI and controls the radio. • The connection from the terminal, computer, or Raspberry Pi is usually RS-232. The TNC-Pi can communicate using I2C. • The audio modulation is “always” AFSK. • The packet protocol is “always” AX.25. Audio Frequency-Shift Keying • Abbreviated to AFSK. • Binary data is represented with two frequencies. • Seemingly by convention, the Bell 202 standard defines those frequencies: • 1200 Hz and 2200 Hz to represent bits. • These frequencies are transmitted over an AM or FM frequency. • For example, FM at 144.390 MHz is usually used by Automatic Packet Reporting System 2 1/17/2015 Audio Frequency-Shift Keying • Sample • http://commons.wikimedia.org/w /index.php?title=File%3AAFSK_12 00_baud.ogg • Visual • http://en.wikipedia.org/wiki/Freq uency- shift_keying#mediaviewer/File:Fsk .svg AX.25 • Designed for amateur radio. • Based on the X.25 ITU-T standard, used for packet switched wide area networks. -
Implementation of a Communication Protocol for Cubestar Master Thesis
UNIVERSITY OF OSLO Department of Physics Implementation of a communication protocol for CubeSTAR Master thesis Markus Alexander Grønstad July, 2010 Abstract This thesis describes the process of implementing the software part of a communication sub-system for a student built satellite (CubeSat). The im- plementation consist of a communication protocol in the data link layer that utilizes AX.25 frames for communicating with a ground station based on am- ateur radio equipment. The development and usage of this communication protocol are based on data communication theory, link budget calculations, efficiency and availability analyzes together with practical tests. The steps in how this software has been developed and evaluated are described, and can be useful for other project that could benefit from this communication pro- tocol. Source code listings are included. The reader should be familiar with communication theory, data communication, programming and electronics. ii Acknowledgement Some fantastic years at the University have come to an end, and a long journey as an academic ambassador has started. In my B.Sc. and M.Sc. degree I have explored and studied the fundamentals of technology that always have fascinated me. My masters project started one year ago at the Department of Physics. The opportunity to combine several interesting fields as digital communication, programming and electronics made this project really interesting for me. It has been highly enjoyable to see the results from practical implementations of theory in this project, and having the final project goal of a functional satellite. I would like to thank associate professor Torfinn Lindem for the opportu- nity to take this masters project. -
The KISS TNC: a Simple Host-To-TNC Communications Protocol
The KISS TNC: A simple Host-to-TNC communications protocol Mike Chepponis, K3MC Phil Karn, KA9Q ABSTMCT The KISS’ TNC provides direct computer to TNC communication using a simple protocol described here. Many TNCs now implement it, including the TAPR TNC-1 and TNC-2 (and their clones), the venerable VADCG TNC, the AEA PK-232/PK-87 and all TNCs in the Kantronics line. KISS has quickly become the protocol of choice for TCP/IP operation and multi-connect BBS software. 1. Introduction Standard TNC software was written with human users in mind; unfortunately, commands and responses well suited for human use are ill-adapted for host computer use, and vice versa. This is espe- cially true for multi-user servers such as bulletin boards which must multiplex data from several network connections across a single host/TNC link. In addition, experimentation with new link level protocols is greatly hampered because there may very well be no way at all to generate or receive frames in the desired format without reprogramming the TNC. The KISS TNC solves these problems by eliminating as much as possible from the TNC software, giving the attached host complete control over and access to the contents of the HDLC frames transmitted and received over the air. This is central to the KISS philosophy: the host software should have control over all TNC functions at the lowest possible level. The AX.25 protocol is removed entirely from the TNC, as are all command interpreters and the like. The TNC simply converts between synchronous HDLC, spoken on the full- or half-duplex radio channel, and a special asynchronous, full duplex frame format spoken on the host/TNC link. -
(12) United States Patent (10) Patent No.: US 8,577,458 B1 Libbus Et Al
US008577458B1 (12) United States Patent (10) Patent No.: US 8,577,458 B1 Libbus et al. (45) Date of Patent: Nov. 5, 2013 (54) IMPLANTABLE DEVICE FOR PROVIDING FOREIGN PATENT DOCUMENTS ELECTRICAL STIMULATION OF CERVICAL VAGUS NERVES FORTREATMENT OF WO O3O18113 3, 2003 CHRONIC CARDAC DYSFUNCTION WITH WO O3O99373 12/2003 LEADLESS HEART RATE MONITORING (Continued) OTHER PUBLICATIONS (75) Inventors: Imad Libbus, St. Paul, MN (US); Badri Amurthur, Los Gatos, CA (US); Bruce Armour, J.A., “Potential clinical relevance of the little brain on the H. KenKnight, Maple Grove, MN (US) mammalian heart.” Experimental Physiology, vol. 93, No. 2, pp. 165-176 (Feb. 2008). Online Publication Date: Nov. 2, 2007. Avail (73) Assignee: Cyberonics, Inc., Houston, TX (US) able at: http://ep.physoc.org/content/93/2/165.long. Castoro et al., “Excitation properties of the right cervical vagus nerve (*) Notice: Subject to any disclaimer, the term of this in adult dogs.” Experimental Neurology, vol. 227, iss. 1. pp. 62-68 patent is extended or adjusted under 35 (Jan. 2011). Online Publication Date: Sep. 17, 2010. Available at: U.S.C. 154(b) by 0 days. http://www.sciencedirect.com/science/article?pii/ SOO1448861OOO347X. (21) Appl. No.: 13/314,126 De Ferrariet al., “Chronic vagus nervestimulation: a new and prom ising therapeutic approach for chronic heart failure.” European Heart (22) Filed: Dec. 7, 2011 Journal, vol. 32, iss. 7, pp. 847-855 (Apr. 2011). Online publication date: Oct. 28, 2010. Available at: http://eurheart.oxfordjournals.org/ (51) Int. Cl. content/32/7/847.long. A61N L/05 (2006.01) (52) U.S. -
Congr.Ession Al Record-Sen Ate
1924. CONGR.ESSION AL RECORD-SENATE. 453.3 1911. Also, petition of 19 farmers of Cannon Township, Kitt l\Ir. FLETCHER ~fy colleague, the junior ~enafor from son County, 1\Iinn., urging the passage of the ~Ic~ary-Haugen Florida [Mr. TRAMMELL], is unavoidably absent. I ask that bill, providing for the relief of agriculture; to the Committee this rurnouncernent may stand for the day. on Agriculture. '.rhe PRESIDING OFFICER. Seventy-two Senators having 1912. Also, petition of five farmers of Lincoln Township, answered to their names, there is a quorum present. :Marshall County, Minn., urging the passage of the McNary SUPPLEMENTAL ESTIMATE OF APPROP:RL\ TION. Haugen bill, proviiling for the relief of agriculture ; to the Com mittee on Agriculture. The PRESIDING OFFICER laid before the Senate a com 1913. Also, petition of 32 farmers of Sinnott Township, munication from the President of the United States, trans Marshall County, 1\linn., urging the passage of the l\IcNary mitting a supplemental estimate of appropriation for the Dis Huugen bill, providing for the relief of agriculture; to the Com- trict of Columbia, fiscal year 1924, for the maintenance of mittee on Agriculture. · public convenience stations, in amount $3,000, which was re ferred to the Committee on Appropriations and oruered to be printed. ( S. Doc. No. 76.) SENATE. DERT ST A TISTICS. l\Ir. SMITH. l\Ir. President, I have some statistics from the TnuRSDAY, March £0, 1924. United States Department of Commerce, Bureau of the Census, giving the total gross and net debt of the National Government Tlle Chaplain, n.ev. -
Arkana Radiowego Internetu – Packet Radio V1.6
Arkana radiowego internetu - Packet Radio - Podstawy dla początkujących oraz podręcznik dla zaawansowanych w systemach Mariusz Lisowski, SQ1BVN Bydgoszcz, 23 lipca 2000 Arkana radiowego internetu – Packet Radio v1.6. Bydgoszcz 2000-2003 ______________________________________________________________________________________________ Od autora Książka pt. „Arkana radiowego internetu – Packet Radio” powstała na wskutek rosnącego zainteresowania siecią Packet Radio i jest podsumowaniem kilkuletnich zmagań autora i osób współpracujących z budową sieci AmprNet oraz administracją jej węzłów (Człuchów, Bydgoszcz). Ze względu na różnorodność dostępnego oprogramowania do pracy w sieci AX.25 i TCP/IP powstał swojego rodzaju nieład i niejednolitość instalowanych systemów w węzłach sieci AmprNet. Autor wierzy, że stworzona pozycja się przyczyni do wykrystalizowania się określonego standardu opartego na systemie NOS i LINUX. W księżce zawarto wiadomości dotyczące także typowej sieci TCP/IP, czyli internetu. Możliwe, że znajdą tu coś dla siebie przyszli administratorzy sieci profesjonalnych..., ponieważ NOS’y bardzo przypominają platformę Unix’ową i mogą być z powodzeniem „przedszkolem” do pracy na maszynach typu Unix. Jeśli temat będzie dalej cieszył się zainteresowaniem w planie jest napisanie książki o zastosowaniu Linux’a do pracy na PR oraz poradnik dla administratorów oraz twórców nowych węzłów PR na bazie Linux’a. Autor jest studentem trzeciego roku Inżynierskiego Zastosowania Komputerów na Politechnice Koszalińskiej, zgromadzone materiały będą przydatne przy obronie dyplomu inżyniera. Niniejszy dokument objęty jest prawami autorskimi. Autor zastrzega sobie jakiekolwiek zmiany w dziele bez jego wiedzy. Z tego powodu będzie on dostępny w formie tradycyjnej papierowej książki oraz z formie elektronicznej jako PDF’y. Wykorzystanie części lub całości w innych dziełach dozwolone TYLKO za pisemną zgodą autora. Autor zgadza się na NIEODPŁATNE rospowszechnianie „Arkan ...” w wersji 1.5.