Introduction to Packet Radio

May 17, 2018 | Author: Anonymous | Category: Каталог , Без категории
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Introduction to Packet Radio

By Matt Mitchell KB8UVN

Who am I? • • • •

Matt Mitchell, KB8UVN Licensed since 1994 Active on Packet Radio since 1995 TCP/IP Coordinator for Ohio AMPR Net (44.x.x.x) • Trustee of the Central Ohio Packet Association

What do I do? • Operate 8 Packet switches throughout Ohio • Operate 6 APRS Digipeaters including 3 I-Gates and HF Gateway (30m) • Packet Mail forwarding hub for Central Ohio • Operate a Winlink RMS Gateway • Operate a DX Cluster spotting system • Work with surrounding clubs and individuals to help grow packet radio interest and infrastructure

What is Packet Radio? • An effective, error free way to transfer information both manually and automatically • A framework which other applications can be built upon (will cover more later) • An additional service we can provide to fellow hams, similarly to running a repeater system • A great way to meet hams in neighboring areas

What Packet Radio is not? • A competitor to broadband Internet Access (speeds typically range from 1200 to 19200 Baud from 50 Mhz through 450 Mhz)

How to get started • Most packet stations consist of 3 components – Radio – Computer (with associated software) – TNC (or other interface)

Radio • Most packet operations take place on 2m. The unofficial “calling” frequency for 2m, 1200 baud packet is 145.010 MHz • APRS in North America can be found on 144.390 MHz • 6m, 1¼m and 70cm are also usable but less popular

Computer • Just about any computer will work, some better than others and the newer the system, the newer the software can be usable (mainly in the Windows world) • It’s possible to run packet on a dumb terminal, but it requires the use of a TNC. Most of us likely have a computer in our shack that can be put into packet service already.

TNC • TNC stands for “Terminal Node Controller” • Similar to a telephone modem, but with circuitry to handle the PTT line on radios • Usually interfaces via serial line to a computer • Some or all capability is retained while disconnected from the computer (to host a digipeater for example)

TNC Types • There are 4 major vendors of TNCs – Kantronics • Mostly popular with the KPC-3, also offering a KPC-9612 and KAM for Multimode operation on HF

– MFJ • Manufacturer of the widely developed TNC2 clone (from TAPR) with their 1270b, 1270c and recently released 1270x models

– AEA/Timewave • Offers TNC units that can be used to build networks with the PK-12 and PK-96.

– Paccomm • Offers several flavors of TNC, for awhile the only TNC2 clone available. Several different options available

Soundcard Interfaces • West Mountain Radio – Several Rigblaster models which cover packet and other modes

• Tigertronics – Offer Signalink USB interface which does not require an existing soundcard

• Other – Several other options are available. It is possible to home brew your own interface and run cables directly to the soundcard already in your computer

Packet Software • Available for DOS, Linux and Windows • Most is tailored for a specific application which is built on top of packet. • In it’s simplest form, when using a TNC, it is possible to use basic terminal software such as Hyperterminal on Windows or Minicom on Linux

DOS Software • Paket – Freeware available for download from TAPR’s website

• KaGold/PkGold – Commercial software, very versitile but only works with Kantronics or AEA/Timewave TNCs

• G8BPQ Net/Rom software • F6FBB BBS software • TNOS & JNOS TCP/IP software

Linux Software • Linux natively supports packet radio in the kernel! – This equates to extensive support for many hardware types which may or may not be supported by DOS or Windows (DRSI Boards, USB Interfaces, etc)

• F6FBB BBS can also be run on Linux • TNOS and JNOS can both be run on Linux • DX Spider Spotting system

Windows Software • PuTTY – Versatile terminal program that can support Serial connections as well as Telnet and Secure Shell (SSH)

• Winpack – Basic terminal interface with scriptable connections

• MixW – Handles many modes as well as packet

• AGWPE – Can be an underlying interface to many TNC/interfaces including soundcards

• G8BPQ 32 Bit – Utilized for Net/Rom packet switches and BBS/Chat systems

• F6FBB 32 Bit – Used for store and forward packet BBS systems

Popular Packet Applications • • • • • • •

Packet Bulletin Boards (BBS) Chat systems DX Spotting (DX Cluster) TCP/IP gateway/support Automatic Packet Reporting System (APRS) Winlink Net/Rom packet networking

BBS • Used to store and forward both personal and public messages. • Can be used to route NTS traffic as well as general discussion, for sale items, etc • More advanced systems require the use of a computer to store large amounts of messages • Can be a repository for file uploads and downloads

Chat Systems • Can provide a round table of multiple stations • Can be linked via RF or Internet for world wide conversations • Can support multiple channels to allow many parallel conversations across the same network • Excellent way to meet like minded packeteers!

DX Cluster • Used to send and receive DX spotting information • Linked together to other DX Cluster systems over RF and the Internet to produce a wide area network of DX spot systems • Can be accessed via packet (RF) or over the Internet (telnet)

TCP/IP Gateway • Can encapsulate TCP/IP that is used on the Internet into Packet Radio, which allows support for protocols like FTP, SMTP/POP3 (email) and other applications • Can create AX.25 over IP (axip) wormholes and link different packet systems together over high speed IP links and/or the Internet

APRS • Used for the reporting of many types of information, including position of mobile stations, weather information, local services (such a Repeaters, Echolink/IRLP systems, etc) • Useful for spotting VHF propagation distances and conditions • Can be used for Instant Message type communications

Winlink • Used to send and receive email over both VHF/UHF packet as well as many HF packet modes • Can be used in emergency situations to correspond with hams and non-hams alike • Several clients available which have a similar to email feel

Net/Rom • Net/Rom is a dynamic routing protocol which is at the foundation of most packet networks • It allows routing information to be exchanged between neighboring node systems to automatically spread reachable systems • When configured properly, it will allow for fault tolerance to reroute traffic based on available systems

Any questions?

Links of Interest • Tucson Amateur Packet Radio (TAPR) – http://www.tapr.org

• US Packet – http://www.uspacket.org

• APRS – http://www.aprs.org

• Yahoo Groups – http://groups.yahoo.com (several exist)

• Ohio Packet – http://ohiopacket.org (wiki)

Contact me • Please feel free to contact me with questions about anything covered here or related to packet radio • [email protected] (Internet) • [email protected] (AMPRNet) • [email protected]#cmh.oh.usa.noam (Packet Mail)

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