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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KZAAGRCSB2YA4ULKXJFD2X3SKS7ANGZ5/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "KZAAGRCSB2YA4ULKXJFD2X3SKS7ANGZ5", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RJRBBEQ5TZQVS5WULMUJILG3CB7VF54Z/?format=api", "sender": { "address": "bernd1peters (a) gmail.com", "mailman_id": "fbd20c4b6a0d42c687793f6575cb5927", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/fbd20c4b6a0d42c687793f6575cb5927/emails/?format=api" }, "sender_name": "[email protected]", "subject": "Re: [amsat-bb] How to digipeat?", "date": "2019-09-08T05:07:25Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KRB4ZVIO37WDPEMVOLWG45VMMP4JPTN5/?format=api", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7WBWRMNH3M7GFHZ5RKCXCIEL5CHBQ2E2/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Hi Scott,\n\nOn behalf of all Newbies, thank you for your reply. Thank you for spending a\nsignificant amount of time to detail what is essential information to help\nfellow Hams. \n\n73,\n\nBernd - KB7AK\n\n-----Original Message-----\nFrom: AMSAT-BB <[email protected]> On Behalf Of Scott via AMSAT-BB\nSent: Saturday, September 7, 2019 1:36 PM\nTo: AMSAT <[email protected]>\nSubject: Re: [amsat-bb] How to digipeat?\n\nHi Hans!\n\nLike any digital mode, 1200 or 9600 packet requires several things to work\ntogether using the correct settings. This might run a little long, but I'll\nbe glad to outline them.\n\nBut first, one helpful thing to remember is that you want to treat the\nuplink & downlink as completely separate affairs. Depending on the\nsatellite, the uplink and downlink might find you using different bands,\ndifferent radios, different antennas, different software... at a MINIMUM\nyou'll be using different RF frequencies even if it's a simplex packet\ndigipeater since the doppler compensation will be opposite for up -vs- down.\n(caveat - on 2m normal FM you can get by with sitting on one freq) To me\nit's always made sense to verify that you're 100% good to go on the\ndownlink, then set yourself up for the uplink.\n\nSo, if anyone wants to read on, here are the things to consider.\n\nRF: you'll need to know what the uplink & downlink RF frequencies are and\nif either is in the 70cm band, doppler compensation is mandatory. Here's a\ntip: several of the newer sats are using NARROW-FM... even if you're working\non 2 meters, doppler compensation to/from a narrow-band satellite radio is\nmaking a huge difference in my experience. CAT control your radio if\npossible; if not, then pre-program 5 memory channels the way most people\nhave their FM radios setup for voice satellite work.\n\nMOD/DEMOD: your radio needs to have a connection to your computer where you\nrun software set to decode the type of modulation in use by the satellite.\nOn Windows, the various UZ7HO Soundmodem versions provide perhaps the\neasiest interface to work with. Direwolf is an option on Windows, too, and\nby-the-way makes for a very easy to use iGate utility running off to the\nside of your screen. On linux, Direwolf is the most popular option to my\nknowledge. On either platform, of course we have to find out from the\nsatellite documentation what settings are required. A critical note that\noften prevents success on rates above 1200 baud is that beyond that speed we\nneed more audio bandwidth than is normally available for general listening.\nSo, whether you're using a \"real\" radio or an SDR, good rules of thumb are\n3KHz of audio bandwidth for 1200 baud and 15KHz of audio bandwidth for the\nhigher rates. On modern radios, that means using a connection to the\nradio's \"DATA\" port for rates above 1200. My TM-V71A, for example, also has\na menu option to switch between 1200 & 9600 - very important!\n\nUSER INTERFACE: as you mentioned, the UISS software is a great tool to use\nas the interface when sending/receiving the packet modes. It communicates\nwith UZ7HO Soundmodem or Direwolf to send/receive data to/from the\nsatellite. But what to transmit? We need that info from the satellite\ndocumentation. The \"TO\" is most often \"CQ\", but read everything you can\nfind about the satellite in question to be sure. (hint: monitor the downlink\n& see what others are using!) The \"VIA\" can be confusing because many sats\nwill respond to more than one name. It all comes down to the documentation\n- historically the 1200 baud APRS sats will answer to \"ARISS\"\nwhich is handy... you don't have to change all your settings between\nsatellites. FalconSat-3 is different; we use \"PFS3-1\" when transmitting to\nFS-3. \"If\" there actually is an active digipeater on BugSat-1, the team has\ninstructed us to use \"LU7AA\" as the call sign to access that satellite.\n(I've tried BugSat-1 twice now but at the time of this post, have not had\nany success) As for the payload text to transmit, UISS helps a lot (for\nAPRS sats) by guiding us into sending properly formatted 'TEXT', 'POSITION',\nand 'MESSAGE' type APRS packets. Monitoring the downlink and seeing what\nmessage types others are having success with is helpful here.\nHeck, everything I do on the sats is a copy-cat of the operating techniques\nused by the operators that you see post repeatedly here, on Twitter,\nQRZ.com, and elsewhere. A huge 'thank-you' to all who share how-to info!\n\nSo, aside from individual considerations that are unique to particular\nsatellites (FS-3 is cross-band full-duplex, for example), that is an\noverview. If anyone has read this far, you have my sympathy. I just wanted\nto spell out what is common knowledge to most here on the chance that one\nitem might ring a bell and answer a question for you. If the ISS or either\nof the PSAT digipeaters would come back online, that would make it a lot\neasier to practice with these modes. As of the date I'm typing this, all we\nhave active over my location in the U.S. are AISAT-1 (1200\nnarrow-FM) & FS-3 (9600).\n\nGood luck!\n\n-Scott, K4KDR\n\n===========================\n\nOn Sat, Sep 7, 2019 at 11:01 AM Hans BX2ABT via AMSAT-BB\n<[email protected]>\nwrote:\n\n> Hello all,\n>\n> Apparently my mail about BugSat-1 raised some interest into that \n> bird's digipeater. But that still leaves me with the following \n> question (and I hope I don't sound too obtuse): how do you digipeat? \n> I've tried to understand it by googling it over the past year or so, \n> but I still don't get it much. Most tutorials explain about setting it \n> up, but with HTs. I am running a home station only, with the rig \n> connected to a PC. From what I understand you need to use the program UISS\nthen.\n>\n> I got as far as this: I installed UISS (under Wine) and got it \n> connected to Direwolf. Right now I can work the Falconsat-3 BBS using \n> PacSat Ground Station and while running that program I see the same \n> messages that Direwolf displays also appearing in UISS. So far, so \n> good, but then what? I press either F5, F6, or F7, but nothing \n> happens. Yes, my rig burps out some data for a split second, but I \n> can't find myself back on APRS.fi. So what am I doing wrong? Any \n> parameters to adjust? Or are digipeats not stored for the next iGate to\nput it on the internet?\n>\n> Again, I hope I don't sound too witless, but I've never really \n> understood APRS, apart from terrestrial position reporting and even \n> that was kind of hard with all the paths and whatnot. Hope you nice \n> people on this list can drop some pointers. 73 de Hans\n>\n> P.S. I've got some nasty local interference on 145.825 MHz and that \n> makes receiving the ISS and other birds almost impossible. I was lucky \n> to get two frames in from IO-86 the other day, because that was due \n> south, with the QRM coming from the north-east. Getting a signal up \n> shouldn't be much of a problem, though.\n>\n_______________________________________________\nSent via [email protected]. AMSAT-NA makes this open forum available to all\ninterested persons worldwide without requiring membership. Opinions\nexpressed are solely those of the author, and do not reflect the official\nviews of AMSAT-NA.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb\n\n", "attachments": [] }