Sound-Card Packet
acket radio isn't dead yet. It's not even on life support. In fact, AX.25 networks seem to be experiencing somewhat of a rebirth. Although not quite to the level of packet's heyday of the late 1980s, just before the internet, there is more activity out there than you might think. The Automatic Packet Reporting System ("APRS," a trademark of Bob Bruni,nga, WB4APR) today consumes a significant portion of the ba.nd width being used for AX.25 packet. As a tactical system, it can't be beat, as evidenced by its stay ing power after some 17 years. If you want to track assets or exchange small amounts of data such as weather reports or short messages, it is an excellent tool. It has proven its value in emergency communications as well. There are still several large networks out there running FlexNet, TheNET X1J, FPAC, a~d even ROSE, in many cases supplemented by !nternet Fig. 1- Once installed, AGWPE drops. an ico.n connections via AMPRnet or similar tunneling sys onto the Windows@ system tray, two tmy redio tems. These networks carry traffic from keyboard towers connected by a TNC. Right or left clicking to-keyboard enthusiasts, the Bulletin Board Sys this icon brings up a menu, which is used to set tem (BBS) for moving e-mail, and a few chat nodes up and control the application. R~n:ember that for online meetings. Most networks also support AGWPE is just "middleware," flllmg the gap TCP/IP traffic, allowing for seamless integration between a host program and your radio with a with the internet and the resources it offers, par "virtual" TNC, which handles the AX.25 protocol ticularly software such as MS Outlook® for e-mail. and your sound card. The icon to the left shows While many of these networks still run at 1200 up once a virtual TNC is configured. baud, sometimes with backbones at 9600 baud, they may be slow but they seem to ?e a lot more only be done with a dedicated piece ofhardware robust than the hastily planned and Implemented known as a Terminal Node Controller, or TNC. proliferation of nodes that sprung up 20 years ago. Mostly based on the Tucson Amateur Packet I had written about planning and building networks Radio (TAPR) TNC-2 implementation, there were for reliability and performance, and it seems th,at several TNCs on the market, all costing about these universal lessons learned by commercial $100 to $150. Today, you can buy a new TNC in network builders has finally caught on with our some form or another from several companies wireless systems. It's either that, or the effort in including Kantronics, MFJ, PacCo~m, Coastal volved is sufficiently high that people are starting Chipworks, Timewave, and Symek (In Germany) to think carefully about how to best use the limit -for prices from under $50 (for a kit) to over $200. ed resources at hand. Today, with multi-GigaHertz processors the One last area where packet is still seeing con norm, we can utilize the power of the personal siderable use is in emergency communications computer and sound card to replace the ~ardware (EmComm). While the very first responders to a TNC. The hardest part is usually the Interface disaster can accept lossy communications paths between the sound card and the radio, but sever -that is, methods that do not absolutely guaran al companies (such as West Mountain Radio) offer tee error-free communications, such as voice, CW, ready-built interfaces from a few dollars and up, or even PSK31-afterthe initialefforts start to solid or you can build one with components from your ify into a larger, more coordinated activity, the junkbox or at most for just a few dollars at need for lossless communications (for e-mail, RadioShack. More on that in a moment. image or data files, and the like) becomes more If you want a hardware TNC, you can check and more important. PACTOR and the eBay for used ones (I have seen them sel~ for ~s WinLink2000 system are great resources for this, little as $50) or visit your local hamfest (winter IS but some are unable to afford a PACTOR III finally over!) and ask around. I'd be surprised if modem, so they turn to AX.25 packet instead. For someone there didn't have one gathering dust that one approach to using packet effectively for they were willing to let go for cheap. EmComm, see the article "EcomScs and The way I see it, there are four groups of use~s GateWayScs: Easy-to-Use Packet Radio Software out there: Those who have tried packet and still for Emergency Communications," by John use it: those who have tried it but are not active Blowsky, KB2SCS, elsewhere in this issue. today; those who have never tried it but might Ii.ke In the past, when a typical home PC used an to and those simply not interested. The remain 80486 processor running at 33 MHz, packet could d~r of this month's column is for that third group: *P.O. Box 114, Park Ridge, NJ 07656 Here is a way to get on packet and see what the e-mail:
74. CQ • April2009 Visit Our Web Site cancel I
Fig. 2- Each port must be configured before it can be used. Fig. 3- As soon as "sound card" is selected for TNC type, Here we see the NewPort TNC Setup dialog window. What's this window opens. What's important here is the on-air baud important here are the settings for the computer port (here rate for the left channel, and that your correct sound card is COM1), TNC Model, baud rate, and "Single Port" operation. shown at the very bottom. Once this window is configured, See the text for details. return to the TNC setup window of fig. 2, finish setup, and restart AGWPE to complete setup. used to operate packet, I also encourage you to either dust Let's just take a quick look at getting, configuring, and using off that old TNC and see what's out there, or just follow along the software, and then learn about an excellent online to learn more about the sound-card method. Remember, half resource with far greater detail on these topics. the fun of packet is operating; the other half is making it work There are five basic steps to using AGWPE: Download the and learning something. software; configure it; buy or build a radio sound-card inter face; set up your sound card; and set up some kind of "host" program. Once complete, you can also configure AGWPE Sound-Card Packet for TCP/IP operation, as well as for a second radio on the There are a few pieces of software available that allow you same sound card. to use your PC and sound card to operate AX.25 packet You can download the free AGWPE software at (Note: Some applications may require the use of a hardware
ClIld:MY MYca 11 1l21RZ ClIld:C WA2SIlA-4 *M* DISCONNECTED RETRYOUT With WA2SIlA-4 7 WinPack-AGW uses a Virtual TIlC - what appears to the user as the TIlC responding to TIlC2-st~le cOllllllands is, in tact, part of the software. The available Virtual TIlC collllllands are:- AUtossid BAddress Beacon BPort BText CHancall CONVerse CText Connect Disconnect DISPla~ Help MCOII MHeard lIonitor Mllask IITX IIYcall Pac len POrts Unproto UPort WCText Most cOllllllands can be abbreviated. The lIlinilllUIll abbreviation is shown in upper case. For help on a cOlllllland use 7
The World's most authoritative monthly magazine for Shortwave listening ami Scanner Monitoring. Fig. 4- The main screen ofWinPack, a typical "Host Program"that utilizesAGWPE. Read by more active There are several other such host programs available, including WinAPRS and listeners world-wide. more specialized applications such as OX Clusters, network nodes, and more. Here I issued the commands to verify my cal/sign setting, and attempted to con You'll find features on scanner moni nect to a local Bul/etin Board system WA2SNA-4 (which timed out) and the toring of police, fire, utility, and aircraft WinPack help file. communications; international short wave listening; CB radio; amateur radio; FRS; GMRS; monitoring radio listed. If you have more than one sound sories"), and the MixW RigExpert digital communications including CW, card, select the one you want to use
78. co • April 2009 Visit Our Web Site tones sound musical and not at all harsh or raspy. If you have a deviation meter, the ideal is 3.5 kHz peak deviation. u~_ ~0{i Again, use the AGWPE Sound Card ireless Remote antra for your radio! Timewave's Newest HamUnk ™ familY member brings~"~0vV~ve," Tuning Aid and transmit into a dummy wireless rig controltoyourstation. ~cJi;c';:' "'-"', load for this step. t Last, we need to select a Host appli • Audio and PTT! • Great for field day \cf:)@[) '/ cation and set it up. I downloaded and II Bluetooth® wireless tectll'lology • Monitor from your easy chair~00J""" installed WinPack
I hope this brief introduction piques -- --- your interest in packet radio. If you have ~~~GlO [3~[)OO$[j) .•.~[ill®m. @@)lE)[3.G}Wcf) any questions, please feel free to write O®®'i]'~&I]][illDW@~&[f1~ ~@~~ G}~ 01WOOG}\yG}~OGl~O@~ and ask. CO's "Getting Started in Packet • Radio" video is still available as part of W@~G}\[email protected])G}~ @O~@ @G1[?C0f~W~l@G}~@~ . the "VHF Specialty Pack" DVD (call or ®[? OOl@:l.~~iTI~~~.~C&~~. OG}W)~~($~,W~~li'®[h@'U@[?~ visit the CO store online). You can also .@3E'~~~~~~~~~~C?~~~~g~~[?Q ask around locally to learn what network facilities are available, or scan the inter net for info. I hope to see you on the air! Mastercard, Visa and Amex accepted' Dealers wanted outside Until next time. . . 73, Don, N21RZ www.cq-amateur-radio.com April 2009 • CQ • 79