October 2018 - AMSAT-BB - mailman.amsat.org

SATPC32
by Kirk P 28 Oct '18

28 Oct '18

So Im new to using my IC9100 and SATPC32..so PSE bare with me..HI. Using Ver 12.8d Im finding that for some passes tracking works well. I can follow along with stations fine. I hear my DL fine. For other passes I cant hear my DL at all..Though I can see myself on an SDR rx but way off freq from where radio is looking.. Also noticed that the CAS-4B bird when selected does not have any freq data showing thus no radio qsy or tracking. (Have not checked all of them) Tried to find the .SQL file but it seems that does not exist. Can someone walk along with me and get my pointed in right diretion please. Much appreciated. Kirk, N0KK Sent from Outlook<http://aka.ms/weboutlook>

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Re: [amsat-bb] APRS to Moon orbit?
by Ross Whenmouth 28 Oct '18

28 Oct '18

Nick, LORA uses chirp spread spectrum, with a signal that is ~ 125 kHz wide (in 11 bps mode). If we have sufficient spectrum to accommodate this, then it might be worth considering. Sorry Bob, I must have miss-read your original posting? as I did not realise that your proposal was for a backup command link as opposed to an APRS user port. Considering the wide coverage area, and the need for only a small number of backup-capable ground stations, would it be reasonable to increase the requirements of the backup ground station to that of a "big-gun" EME station? If the RX chain of an FM receiver was non-linear before the last IF filter, I'd expect that radio to be terribly susceptible to intermodulation? (though after the RX RF has passed through the last IF filter, then yes, linearity does not matter for FM). When I get a chance, I'll have to do an experiment with an FM RX, an RF signal generator and an oscilloscope connected to the 455 kHz IF... 73 ZL2WRW Ross Whenmouth

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Dual band beam comparisons
by John Geiger 28 Oct '18

28 Oct '18

Does anyone have any experience comparing the Cushcraft A270-10S dualband yagi with the MFJ 1768 yagi? I have used the Cushcraft before, and am looking at getting a dualband yagi again. Has anyone used the MFJ yagi, and if so, what is your opinion of it? 73 John AF5CC

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Ten-Koh, PROITERES-2, DIWATA-2B, Stars-AO, AUTcube2 Launch info
by Masahiro Arai 27 Oct '18

27 Oct '18

Five satellites which operate amateur band launch at 0408z 29th Oct by H-IIA F40. The satellites are Ten-Koh, PROITERES-2, DIWATA-2B, Stars-AO and AUTcube2. They will separate around Antarctica and toward South America. Ten-Koh's web site shows its initial TLE as following. This will help for chasing the satellites. http://kit-okuyama-lab.com/%e3%81%a6%e3%82%93%e3%81%93%e3%81%86/ten-koh-orb… TENKOH STK sim 1 99999U 18302.19537037 .00000103 00000-0 98916-5 0 00009 2 99999 097.7878 44.6815 0022959 006.5055 234.0628 14.92980398000011 Ten-Koh http://kit-okuyama-lab.com/%e3%81%a6%e3%82%93%e3%81%93%e3%81%86/ten-koh-orb… (in Japanese) http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=579 downlink 437.390MHz AFSK 1200bps, BPSK 9600bps, CW 437.510MHz WSJT uplink 435.280MHz PROITERES-2 http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=566 downlink 145.850MHz AFSK, CW uplink 435.650MHz DIWATA-2B http://phl-microsat.upd.edu.ph/diwata2 http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=593 downlink 145.900MHz FM Repeater, CW tlm, APRS, AFSK uplink 437.500MHz FM Repeater Stars-AO http://stars.eng.shizuoka.ac.jp/starsao.html https://stars-ao.info/ (in Japanese) http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=558 downlink 437.350MHz CW, 437.400MHz AFSK, 437.200MHz HighSpeed degital AUTcube 2 http://www1.aut.ac.jp/~nishio-lab/AUTcube2/index_AUTcube2_E.html http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=575 downlink 437.385MHz AFSK 1200bps FSK 9600bps, 437.505MHz WSJT Launch live broadcast by JAXA and MHI on YouTube from 0330z 29th Oct https://www.youtube.com/watch?v=OAyL0VCf_L4 https://www.youtube.com/watch?v=42lrAkmBNvg JAXA Special Website: Earth Observation Satellites http://fanfun.jaxa.jp/eos/en/index.html MHI Launch Services Twitter https://twitter.com/MHI_LS H-IIA F40 Launch Procedure event T altitude HH:MM:SS km -------------------------------------------------------- 1 liftoff 00:00:00 0 2 solid rocket booster burnout 00:01:48 42 3 solid rocket booster separation 00:02:06 54 4 upper fairing separtion 00:04:20 131 5 1st stage main engine cuttoff 00:06:38 271 6 1st/2nd stage separation 00:06:46 283 7 2nd stage engine ignition 00:06:55 297 8 2nd stage engine cuttoff 00:15:26 613 9 Ibuki-2(GOSAT-2) separation 00:16:16 613 10 lower fairing (adapter) jettison 00:19:51 613 11 lower fairing (cylinder) jettison 00:19:56 613 12 KhalifaSat separation 00:24:21 616 13 Ten-Koh separation 00:33:20 623 14 PROITERES-2 separation 00:38:20 624 15 DIWATA-2B separation 00:43:20 621 16 Stars-AO separation 00:48:20 614 17 AUTcube2 separation 00:51:00 610 Source: Rocket Launch Plan by JAXA and MHI Aug 2018 Masa JN1GKZ Tokyo Japan

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W5FC on the sats.
by tjschuessler＠verizon.net 27 Oct '18

27 Oct '18

I will be doing a series of demonstrations and talks at a Dallas Amateur Radio Club mentoring event called "Technet on the Hill" at Flagpole Hill Park in NE Dallas, Texas, this afternoon, Saturday, 10/27-2018 from probably after 1900Z to maybe 0100Z. I will be using the club call W5FC and hoping to get some folks new to satellite on linear passes as well as the FM birds that will be available. If you here us on, please give us a shout. 73 Tom Schuessler, N5HYP EM12

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9100 tones on satpc32
by bob lee 27 Oct '18

27 Oct '18

Good day, I was wondering if you had the tone problem fixed up on your 9100 if not you have to set up the tones on satpc32 subtone.sql heres mine for a couple I use AO-85,67.0,$7C,1 AO-85,74.4,$7C,3 AO-91,67.0,$7C,1 AO-91,74.4,$7C,3 AO-92,67.0,$7C,1 AO-92,74.4,$7C,3 you can see it in the ? menu under auxillary files then once you select a sat you click the "T" on the main screen If you have multiple tones set up, clicking on the "T" will cycle through the tones setup in the subtone file hope this helps if you havent figured it out 73 Bob VE3CGA

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Re: [amsat-bb] APRS to Moon orbit?
by Ross Whenmouth 27 Oct '18

27 Oct '18

I strongly suggest using a modulation other than 1200 baud AFSK packet (AX.25) over NBFM. The path you propose is severely power limited, and AFSK over NBFM is at about a 7 to 10 dB penalty compared to other modulations (like BPSK or direct FSK): https://www.rowetel.com/?p=3799 From my perspective, it would be much easier to connect a PC soundcard to an SSB transceiver to produce say 25W BPSK / MSK / etc than it would be to "upgrade" my station to include a 250W amplifier + PSU, etc. Also, a "9k6 ready" FM transceiver could be used for a direct FSK uplink (1200 bps direct FSK @ 50W ?), and the IF of an FM transceiver can be tapped before the limiter, mixed down from 455 kHz to say 12 kHz and fed into the line in of a PC soundcard, permitting a BPSK etc downlink to be received with an FM rig and demodulated in software on the PC... AX.25 packet doesn't have any forward error correction, thus a single bit error results in the whole packet being dropped (we can do better!): http://www.stensat.org/docs/FX-25_01_06.pdf Assuming that the bird was in an "earth-synchronous" polar orbit around the moon, it would always have line of sight to the surface of the earth, and a gain antenna pointed perpendicular to the plane of the polar orbit would always face the earth. I believe that getting mass to lunar orbit is horrendously expensive, so would it make more sense to use a gain antenna on the satellite? a 100W UHF amplifier (for an omni antenna) requires quite a bit of power and cooling to operate, and I bet that cooling a 100W amplifier in a vacuum and microgravity is an "interesting" engineering challenge... Dare I say it, but the path loss to / from geostationary earth orbit is significantly less, the coverage area is still really good (like a 1/3rd of the earths surface from a single satellite) and we've probably got far more chance of getting a payload there (es'hail-2...). 73 ZL2WRW Ross Whenmouth On 26/10/18 10:59 AM, amsat-bb-request(a)amsat.org wrote: > Message: 8 > Date: Thu, 25 Oct 2018 17:46:23 -0400 > From: Robert Bruninga<bruninga(a)usna.edu> > To:amsat-bb@amsat.org > Subject: [amsat-bb] APRS to Moon orbit? > Message-ID:<9916263926d9b8f446280d0b78967759(a)mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > Here's a crazy idea for APRS to moon orbit (omni antenna). > > Unless I did something wrong, I think an Oscar class long yagi, and 250W > amp and 1200 baud FM packet can be received out near the moon with 3 dB > margin? A key factor is that the nearly 16 dB of assumed noise floor we > have here on the ground at VHF does not exist in deep space. And VHF > gives the largest receive aperture for a crossed dipole on the spacecraft. > > The omni UHF downlink is a bear. But with quad UHF long yagis and a 100W > transmitter at the moon distance we still come up about 12 dB short. Can > we make up for that with distributed processing gain from a minimum of 16 > Oscar class ground stations all phased together with the internet and GPS > precise timing and a little software? > > If we could, then we have APRS out to moon orbit, with the downlink > visible to all via the APRS internet system. And in digipeating mode, we > have half-earth coverage half the time when the moon is up. > > What did I do wrong? > > Bob, Wb4APR

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FLASH: 2018 AMSAT Symposium Tickets
by Robert Bankston 26 Oct '18

26 Oct '18

We are one week out from the 2018 AMSAT-NA 36th Annual Space Symposium and General Meeting, November 2-4, at the U.S. Space and Rocket Center, Huntsville Alabama. Online ticket sales end at Noon (EST), October 29th. Tickets to the Symposium can still be purchased at the door, but the price increases to $70. Banquet tickets will NOT be available for purchase after Monday. It is going to be a great Symposium, so don't miss out. I look forward to all of the eyeball QSOs. 73, Robert Bankston 2018 AMSAT Symposium Chair

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2018 AMSAT-NA 36th Annual Space Symposium and General Meeting Schedule
by Robert Bankston 26 Oct '18

26 Oct '18

NEWS FLASH: The list of papers to be presented at the 2018 AMSAT-NA 36th Annual Space Symposium and General Meeting, as well as the AMSAT Ambassador Breakfast have been added to the Schedule on the AMSAT website. http://www.amsat.org/symposium-schedule/ 73, Robert KE4AL 2018 AMSAT Symposium Chair

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AO73 FUNcube -1 mode change
by Graham Shirville 26 Oct '18

26 Oct '18

Hi All, Just to report that AO73 is now in continuous educational mode with high power telemetry whilst we continue to investigate the reasons for the changes in spin rate that are taking place whilst the spacecraft is in continuous sunlight. Please enjoy the strong and easy to receive signals! 73 Graham G3VZV

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