Date: Wed, 27 Feb 2002 18:32:06 -0500 From: Miles [wf1f@mediaone.net] Cc: sarex@amsat.org Subject: [jamsat-sarex:8303] How to use ISS UNPROTO packet February 27, 2002 How to use the Amateur Radio "Round Table" via the International Space Station Alpha By G. Miles Mann, WF1F MAREX With contributions from: Frank Bauer Chairman ARISS Bob Bruninga WB4APR Short Version: (ISS Personal Message System and Voice tips will be published later) The New Amateur Radio project on the International space Station is now on line. The name of the International Space Station new Amateur Radio experiment is the "Packet Radio System" or PRS. The ISS PRS experiment is designed to allow beginners, easy access to the International Space Stations educational Amateur Radio experiment. If you have an existing Amateur Radio 2-meter packet station at home now, then you may already have all of the equipment you need to meet new friends around the world or start a friendship with the Cosmonauts and Astronauts on board ISS. The ISS Packet Radio System supports three different modes, Personal Message System, Round Table and APRS. In this article I will describe the equipment you need to operate the Packet Radio Systems' "Round Table" mode on ISS. The other supported modes, Personal Message System and APRS will be covered in separate memos and I will provide URL links for additional APRS information. Round Table: The "Round Table" mode is a keyboard to keyboard form of communication. Round Table will allow you to type short messages, which will be relayed (a.k.a. Digitally Repeated or Digi for short) through the PRS and retransmitted over a distance in excess of 1000 miles. Round Table mode allows many people to participate in a Round Table like environment while the ISS is in range. The PRS Amateur Radio call sign for the Round Table mode is ARISS or RS0ISS. Personal Message System: The Personal Message System (a.k.a. PMS or MailBox) mode allows you to place a short personal message directly into the PRS system on ISS. Once the message is Saved, the ISS crew can read and or reply to the message. The ARISS team is working on the Rules on how we will use these limited resources. At the present time, the ISS crew is just too busy to read and replay to any of the messages in the PMS. The ARISS team is in the process for developing operating procedures for the Personal Message System. The PMS mode is currently being tested by the ARISS System operators and selected ARISS support engineers. The general public is being asked to refrain from using the PMS mode while the performance is being evaluated. The PRS Amateur Radio call sign for the Personal Message System mode is RS0ISS-1. APRS (Automated Position Reporting System): The APRS mode is no different from the Round table mode except that APRS software on the ground is used to preformat the message lines into some special formats for conveying position data, map objects and other short messages between users. For more information on APRS, please refer to the following URL http://www.ew.usna.edu/~bruninga/iss-faq.html ISS Hardware: The ISS is currently using an Ericsson portable radio (known as a HT) which is operating on the Amateur Radio 2-meter band. The Packet Radio System (PRS) is using a Paccom Picopacket 1200 baud Terminal Node Controller (also called a TNC or Packet Radio System). The radio is currently connected to a pair of externally mounted co-phased mono band antennas (2-meter band). The typical power output is 5 watts, with an ERP rating of 5 watts. To work ISS from your home, you should have at least the following Amateur Radio equipment. A 2-meter radio with an output rating of 25 to 50 watts or more. An omni-directional antenna or small beam. A short run of good quality coax (RG-213, 100 feet or less). And a standard 1200 baud AX.25 Packet modem (TNC). I use an inexpensive KPC-3 modem for all of my ISS packet connections. The ISS will use different frequencies, depending on the Mode of operation and the general location of the Space Station. Please refer to the chart below for mode and frequency selection for your country. The following frequencies are currently used for ARISS general QSO's Voice and Packet Downlink: 145.80 (Worldwide) Voice Uplink: 144.49 for Regions 2 and 3 (The Americas, and the Pacific) Voice Uplink: 145.20 for Region 1 (Europe, Central Asia and Africa) Packet Uplink: 145.99 (Worldwide) TNC Configuration: In the Manual for your TNC, the "Round Table" feature is called "Unproto". To operate the ISS PRS, you will need to modify some of the settings on your TNC. The parameter changes needed for "Round Table" and "Personal Message System" are the same. The TNC parameter changes for APRS are a little different and will be covered in a separate memo. Most of the parameter changes required for ISS PRS will be compatible with terrestrial BBS operations. Using these suggested parameters will improve you're success rate and at the same time help reduce interference (QRM). Note, for information specifically about ARPS, please see the URL links below. This memo is for Unproto and Personal Message System settings. You do not need APRS to work ISS Personal Message System or Unproto (Round Table) These are the suggested TNC settings for Round Table/Unproto and Personal Message System modes for ISS PRS. The settings for the APRS mode are a little different and will be noted below. AUTOCR OFF BEACON OFF LFADD OFF MAXFRAME 4 MCON ON MCOM ON MONITOR ON PACLEN (Round Table and PMS = 72, APRS = 0) RETRY 6-8 TIME STAMP (Round Table and PMS = ON, APRS = OFF) Unproto CQ V RS0ISS BEACON: OFF Make sure your beacon is disabled. Unattended beacons on the ISS packet uplink frequency will just cause interference. You should only transmit manually while you are at controls. Please keep beacons turned OFF, while on the ISS uplink channel. Only call ISS Round Table Manually !!!! LFADD: OFF This value seems to interfere with normal ISS BBS operations. Make sure LFADD is turned OFF. MCON: ON This value is normally turned "OFF" for terrestrial BBS connections and "ON" for connections to the ISS PRS. This value will allow you to see packets going to other stations, while you are Connected to Personal Message System or Attempting to Connect to Personal Message System. All courteous operators using ISS will keep this value ON when using the Personal Message System mode. MCOM: ON Set this value on to monitor all data. Set this value "ON" if you want to see the details of every single packet. This is very useful while monitoring space packets. But be sure to turn it off if you run APRS or other specialized software. MONITOR: ON Allows monitoring of packets while not connected. PACLEN: 72 (Characters per line) Short data packets are less likely to be clobbered or corrupted. Some APRS software packages may require this value to be set differently, check your specific APRS application for the correct settings. RETRY: 6 You do not want to set this value too high because you may cause interference (QRM) during your initial connect. Also, if "RETRY" is too short, you will time-out during the one of the 4 deep RF signal fades. Foot note 2. During a 10-minute pass, there will be 4 RF polarity shifts in the signal coming from ISS. This shift is caused by the apparent position of the antenna on ISS's in relation to your antenna. TIME STAMP: ON With Time Stamp turned on, you will be able to log data to your disk while you are away and track the time and duration's of the passes. Some APRS software packages may require this value to be set differently, check your specific APRS application for the correct settings. Unproto: The UnProto command has two parts. The first part is the TOCALL and should be one of the generic callsigns recognized by most other software programs such as CQ, ALL, APRS, QST. The second part is the letter V or VIA and the third part is the PATH. For ISS this should be ARISS, which is the digi-repeating alias for ISS. If your packet is successfully digi-repeated by ISS, it will substitute its RS0ISS callsign in the downlink copy. The PATH field may contain multiple entries, but only the first PATH is used for ISS, you may insert your Grid square or NAME in two additional fields for example: Valid examples for configuring the UNPROTO command in your TNC: UNPROTO CQ VIA ARISS CQ VIA ARISS, FRANK, FM19SX CQ VIA RS0ISS, FRANK, FM19SX Space Station Call sign: The Call sign/signal of the PRS on the International Space Station Alpha, is now RS0ISS or rs0iss (that is "rs 0 iss" the value in the middle is the integer Zero) Make sure that when you enter the call sign into your TNC Unproto com_ mand that you enter the correct call sign (Case is not important r=R) AX-25 packet frame conventions: You should try to become familiar with a few of the packet frame identifiers, this will help you understand, what you are seeing. Some of this information should be in your TNC's users manual. C-Connect request D-Disconnect request DM-Disconnect mode UA-Unnumbered Acknowledge UI-Unconnected Information frame I(n)-Information frame (n=0-7). ISS Round Table procedures: The ISS PRS (Packet Radio System) also supports the Digital repeating mode called UnProto / Round Table. UNPROTO / Round Table mode is a way of sending packet messages without requiring an acknowledgment (ACK PROTOCOL) from the other station (hence UNPROTO for Unacknowledged protocol). This mode is similar to RTTY in that, you can have several stations in one big "Round Table" at the same time. Set your UnProto command in your TNC as shown above. Then switch to Converse mode (enter K at cmd: prompt). Now everything you type will be transmitted in UnProto Mode. If the ISS station hears your transmission, the ISS PRS Digi will retransmit your information with a range of over a 1000 miles. Below is a short UnProto / Round Table between a station in Massachusetts and Pennsylvania, using the ISS Digi Round Table. The stations were arranging to meet on HF when the ISS pass was over. Typical Round Table exchange from via ISS: N3CXP>CQ,RS0ISS*:Hi all, great sigs here! de Tom in Allentown, PA WF1F>FN42,RS0ISS*:n3cxp are u on N3CXP>CQ,RS0ISS*:HI miles WF1F>FN42,RS0ISS*:i have the amp on hf 7.215 N3CXP>CQ,RS0ISS*:just copying the mail N3CXP>CQ,RS0ISS*:ok cu after the pass WF1F>FN42,RS0ISS*:ok tom WF1F>FN42,RS0ISS*:monitoring 7.215 lsb The UnProto mode does not guarantee that your message will be successful, but if the ISS Digi does retransmit your line of text, then you can be assured that someone saw it. The line of text you send will be repeated with an Asterisk after it, "RS0ISS*/". If you do not see the Asterisk, then ISS did not hear your packet. UnProto does have its drawbacks, but it is much more efficient to use on ISS than the Direct two-way connect method. Full two-way packet connects via the ISS PRS are not recommended because they use up too much resources and excessive "Retires". Before you try Unproto on ISS, I recommend that you practice on a Terrestrial Digi first before attempting to use the ISS station for Digi-repeating. If you make a few UnProto calls and do not get any echoes back from ISS, it is probably because the band is too busy. Wait and try later. Related Web pages for additional Information on Amateur Radio projects on ISS Ariss web page http://ariss.gsfc.nasa.gov/ Bob Bruninga, WB4APR, US Naval Academy Satellite Lab, ISS APRS web page http://www.ew.usna.edu/~bruninga/iss-faq.html Marex http://www.marex-na.org/ This document may be freely distributed via the following means - Email (including listservers), Usenet, and World-Wide-Web. It may not be reproduced for profit including, but not limited to, CD ROMs, books, and/or other commercial outlets without prior written consent from the author. Until we meet again DOSVIDANIYA Miles WF1F