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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6C4WWTLX7MMCAODXQWHAZONZ2LPIKIZH/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "CD9C727E.3686D%[email protected]", "message_id_hash": "6C4WWTLX7MMCAODXQWHAZONZ2LPIKIZH", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/AKM4ZD5OOXK2CVCOCDAX4BEFR2DKL4WR/", "sender": { "address": "seb (a) wintek.com", "mailman_id": "334792c18f7f4268a405ca1814e93bd0", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/334792c18f7f4268a405ca1814e93bd0/emails/" }, "sender_name": "Stephen E. Belter", "subject": "[amsat-bb] Re: SATPC32 and IC-910H", "date": "2013-04-23T21:40:38Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AKM4ZD5OOXK2CVCOCDAX4BEFR2DKL4WR/", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4RYPA7DWHTWSHDZMPFJVX2T7OPLKSN6W/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Les,\n\nHere is the procedure I've used with SatPC32 and my Icom IC-821 for\nDoppler correction when operating SSB. It should work with any rig that\nis CAT controlled. (This is a corrected version of something I wrote a\ncouple of years ago in response to a similar question.)\n\nYour success operating SO-50 is a good proving ground.\n\nHere is the approach I took:\n\n(1) Install SatPC32, enter your station's latitude and longitude, update\nthe Keplarian elements, and synchronize the PC clock to a national\nstandard like WWV/NIST.\n\n(2) Get your radio and SatPC32 communicating, and verify the operation\n(including Doppler correction) using an FM satellite (for example, SO-50).\n\n(3) Wait for a good pass of VO-52, for example 60+ degrees maximum\nelevation. I suggest VO-52 because it is the newest (compared to AO-7 and\nFO-29), it was more tolerant of using too much transmit power, and it had\nthe smallest transponder correction. Note: This was true in 2011 with\nthe Indian transponder. Since then the Indian transponder has failed and\nVO-52 is using the Dutch transponder which is not as tolerant of high\npower and isn't as frequency stable.\n\n(4) Open the \"CAT\" window. You can move the Window so that it doesn't\nblock access to the main SatPC32 window. Tune the radio above the center\nof the satellite passband to reduce the QRM to other users. Make sure\nyou are in SSB mode on the radio (\"CW-\" on SatPC32).\n\n(5) Using your call and \"Test 1-2-3\", listen for yourself while you are\ntransmitting. You probably won't hear yourself at all, at least I\ndidn't. Using the +100 and -100 buttons in the Transmit Correction part\nof the CAT window, try to find yourself. For VO-52, you should hear\nyourself within +/- 1500 hertz. (I think I was about +800, but that is\nfrom memory on the Indian transponder.)\n\n(6) Once you hear yourself using the +/-100 buttons, fine tune using the\n+/-10 buttons.\n\n(7) You can improve the tuning of your uplink/downlink using CW mode\n(\"CW+\" on SatPC32). Zero-beat the Icom's CW sidetone with your received\nsignal.\n\n(8) *Save* the result by using the \"Save\" button in the CAT window. When\ngiven the choice, save the transmitter correction.\n\n(9) Verify that things are working by working a few VO-52 QSOs.\n\n(10) Repeat using FO-29 and AO-7, in that order. You may need to search\nover a wider frequency range (+/-3000 hertz).\n\n(11) One other important change when moving from FM to SSB. Your power\noutput is important! Learn how to reduce your power and use the minimum\npower needed to hear yourself on the satellite. If you use too much\npower, you'll trash other conversations on the satellite and your\ntransmissions will be badly distorted! This is especially true of AO-7\nmode B; you'll be able to hear the entire satellite passband modulated by\na single CW operator running too much power.\n\nGood luck!\n\n73, Steve N9IP\n--\n\nSteve Belter, [email protected]\n\n\nOn 4/23/13 3:40 PM, \"Les Rayburn\" <[email protected]> wrote:\n\n\n>I'm very new to satellite operation but have been having a blast for the\n>past couple of weeks. Using an IC-910H with attic antennas that include\n>a 7 element 432 Arrow\n>antenna with an SSB Electronics pre-amp mounted at the antenna. 1/2\"\n>hardline makes the 70' run from the attic to the shack in the garage. 2\n>Meters shows a 6 element K1FO Yagi with an SSB Electronics pre-amp and\n>1/2\" hardline.\n>\n>Rig is controlled by SATPC32 via the CI-V interface at 9600 baud.\n>\n>On SO-50, I have no problems with doppler correction as you would\n>suspect. With the other birds, doppler is sometimes an issue. Sometimes\n>I hear stations strongly but when I call them, I don't hear my own\n>uplink and the other station obviously doesn't hear me either.\n>\n>On other passes, the difference is not so great, and I'll hear my own\n>uplink, though usually slightly off frequency.\n>\n>I know its possible to adjust the uplink frequency in the software, and\n>I've tried it during passes without much success. The translated help\n>file from German isn't much\n>assistance to me so far.\n>\n>Can someone on the list point me towards a better explanation on the\n>web, or offer suggestions on how to correct the situation? Any help is\n>greatly\n>appreciated!\n>\n>\n>-- \n>73,\n>\n>Les Rayburn, N1LF\n>121 Mayfair Park\n>Maylene, AL 35114\n>EM63nf\n>\n>6M VUCC #1712\n>AMSAT #38965\n>Grid Bandits #222\n>Southeastern VHF Society\n>Central States VHF Society Life Member\n>Six Club #2484\n>\n>Active on 6 Meters thru 1296, 10GHz & Light\n>\n>_______________________________________________\n>Sent via [email protected]. Opinions expressed are those of the author.\n>Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n", "attachments": [] }