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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BSGWXQ5C5EG574AP6DYZBNB2C6UYJLUN/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "BSGWXQ5C5EG574AP6DYZBNB2C6UYJLUN", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/BSGWXQ5C5EG574AP6DYZBNB2C6UYJLUN/?format=api", "sender": { "address": "archie.hackett (a) hotmail.com", "mailman_id": null, "emails": null }, "sender_name": "John Hackett", "subject": "[amsat-bb] IRB's and Satellites.", "date": "2007-04-26T14:39:24Z", "parent": null, "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UWDSY7FS3WFRPUWMBRNYKL4GCNCYWR2C/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "OBSERVATIONS FROM NORWAY. 26-04-2007.\n\nINTERNET REMOTE BASE STATIONS FOR SATELLITES.\n\nLove 'em or hate 'em ... IRB'as are a part of amateur radio.\n\nSo ... why would LA2QAA want to use one?. Well, they can! be used for \noperating satellites.\n\nOn a recent (unsheduled) visit to the local horse-spittle ... (I don't like \nthese places, they're always full of sick! people) ... the surgeons \npositively refused !! to allow me to set up the satellite array in the \nintensive care unit while they performed renovation work on the pig's heart \nin LA2QAA's chest ... (oink!).\n\n(PAPPA INDIA GOLF as in smoked bacon, not two legged creature with badge).\n\nTheir excuse was that the rotor noise might disturb the other patients \nsnoring ... so lying connected to various hospital type spectrum analysers \nand other pieces of apparatus has a tendency to put a serious crimp in \nsatellite operating for a while and it initiated the reasoning behind why \nLA2QAA might want to use an IRB, to get round the issue of being denied \naerial privilages.\n\nThe following is a short article destined for the Observations from Norway \npages on <http://observations.biz>\n\n........................................................................................................................\n\nAMATEUR SATELLITES AND IRB's\n\n(IRB station = Internet Remote Base station).\n\nFOR PEOPLE WISHING TO OPERATE AMATEUR SATELLITES BUT DON'T HAVE THE \nEQUIPMENT OR KNOW-HOW.\n\n(The know-how can be found elsewhere on this website).\n\nVisitors to the <http://www.observations.biz/> web page will soon become \naware that LA2QAA & GM1SXX are always trying to help newcomers to amateur \nsatellite operating by providing hints and tips in their satellite related \narticles.\n\nTwo of the main excuses used by potential newcomers for *NOT* operating on \nsatellites are ...\n\n1) The sophisticated equipment that is necessary is too expensive ...\n\nand ...\n\n2) I don't have the possibility of erecting rotatable beams ...\n\nThe facts are, neither of the above arguments are valid because ...\n\n1) You don't *NEED* sophisticated equipment ...\n\nand ...\n\n2) Rotatable beams are *NOT* necessary to work satellites that are in low \nearth orbit (LEO).\n\nWhile it is true that AMSAT (The Amateur Satellite Corporation) prefer to \npromote satellites with \"cutting edge\" technology that require expensive \nequipment, there ARE satellites that only require relatively simple \nequipment ... a flying FM repeater like AO-51 and analogue ... (CW/SSB) ... \nsatellites like AO-7 and VO-52.\n\nEven if you don't have the necessary equipment at home to use any of these \nsatellites, providing you have access to the Internet with at least a 300bps \nmodem (preferably faster) you *CAN* work these satellites using only your \ncomputer!!.\n\nUnlike Echolink, which is a 100% Internet based system, an IRB (Internet \nRemote Base) station transmits and receives via the ionosphere just like any \n\"normal\" amateur radio and aerial system. You only connect via the Internet \nto the remote base station ... the IRB transmits and receives your signal to \nand from the satellite via the ionosphere.\n\nYou can control all aspects of the remote rig directly from your computer \nkeyboard or even use a 3G mobile phone. (LA2QAA has actually done it like \nthis using Remote Desktop for Mobile phones software).\n\nWith the VK3UR IRB you can even turn the 70cm aerial remotely as well as \nchoosing an appropriate power level setting, different modes, filters, \nadjust AF and RF gain etc just as if you were actually sitting in front of \nthe rig. The VK3UR IRB uses a TS2000 transceiver so there are a lot of \noptions.\n\nBefore reading further, it would be advisable to read \"HOW MUCH POWER IS \nENOUGH\", part 1 on ...\n\n<http://www.observations.biz>\n\nHOW TO OPERATE THE VK3UR REMOTE BASE STATION FOR AO-7.\n\nFirst ... read the instructions !!! and familiarise yourself with the rig's \ncontrols for changing frequency and the use of filters, operating modes and \nrotor control etc.\n\nNext, tune the TX to 432.150 Mhz LSB, press \"S\" on your keyboard, this will \nput the radio into SPLIT mode, then tune the RX to 145.941 Mhz USB ... make \nsure you have a suitable tracking program on your desktop that calculates \nthe azimuth and elevation as well as the necessary doppler offset. (LA2QAA \nuses NOVA). Now you can remotely turn the 70cm yagi towards AO-7 and operate \njust as if you were operating from your own shack.\n\nREMEMBER !!! ... set up your tracking software QTH as Victoria, Australia \n... *NOT* your home QTH ... otherwise the passes will be (literally) half a \nworld !! off.\n\nAlso remember ... to stay legal, you have to identify at least every 10 \nminutes so you operate with the callsign VK3/YOUR CALL ... it is advisable \nto mention you're operating via the VK3UR IRB in Victoria, Australia so that \nthe Ozzies don't think you're a pirate playing Silly Sods.\n\nThe coordinates for VK3UR are ... 37 degrees, 33 minutes, 43 seconds SOUTH \nand 143 degrees,\n49 minutes, 7 seconds EAST in Victoria, Australia. (Enter these coordinate \ninto your tracking program).\n\nAt the time of writing (24-04-07) the IRB is not set up for FULL duplex \noperation but you should have no trouble at all working ANALOGUE LEO \nsatellites like AO-7 or VO-52 using this method.\nThe station is already set up for FM use with automatic doppler tracking and \ntuning for AO-51 or\nThe ISS ... (see the SETUP menu \"special settings\", satellite operations).\n\nAs well as having the radio interface on my desktop I have NOVA + the \ndoppler corrections visible.\nOf course, this won't be FULL duplex operation but you won't have any \nproblem at all working ANALOGUE satellites with this set-up.\n\nAs with all satellite operating ... get into the habit of using those rather \nwierd things stuck to the side of your head ... (he means EARS, folks). \nLISTEN before you speak. Where appropriate, listen to the beacon BEFORE \ntransmitting and \"guesstimate\" your power accordingly ... (now you know why \nFULL duplex is recommended for operating via satellite).\n\nActually, the MONITOR facility \"could\" be used if the IRB software was \n\"tweaked\" slightly.\n\nYou can obtain a password for operating the VK3UR IRB by sending the owner a \ncopy of your current licence ... (providing it's a reciprocal licence with \nVK) ... to <[email protected]>\n\nThe service requires no registration or donation fee.\n\nHave fun!.\n\n73 LA2QAA John. <[email protected]>\n.......................................................................................................................................\n\nOne very useful feature is that an IRB in a location remote from your normal \noperating position allows you to perform propagation comparisons.\n\nAnother is ... (in my particular case) ... soon after I lose AO-7 on certain \npasses at Frei Island, Norway ... (home QTH) ... I can pick it up again from \nReston, Virginia ... (IRB).\n\nThe main advantage next to the aerial restriction issue is that an IRB \nallows those amateurs whom don't have the necessary equipment to try their \nhand at satellite operation, therefore, hopefully, bringing in some new \nrecruits.\n\n73 John. <[email protected]>\n\n", "attachments": [] }