December 2019 - AMSAT-BB - mailman.amsat.org

cube sat model
by Bob- W7LRD 07 May '21

07 May '21

Hi All-Is there a cube sat model, mock up etc, available anywhere 73 Bob W7LRD

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AMSAT: RFI from LED bulbs?
by Robert Bruninga 19 Jul '20

19 Jul '20

I am hearing reports of RFI from these LED bulbs. Not just HF, but also VHF. If you can make any quantitative assessments of such RFI, please let me know. And the amazing thing is that at VHF you will never notice it because RFI is noise power and it is noise power that keeps a squelch CLOSED. Manuallly open the squelch and sometimes RFI will show full scale on the S meter yet not open the squelch. And on my radios, when the squelch is closed, the S meter is inactive and shows 0. Bob Bruninga, WB4APR

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Re: [amsat-bb] AO92 L/V mode??
by Fernando Ramirez 20 Feb '20

20 Feb '20

> Hi Perry! > > AO-92 was kept in U/V mode in order to allow operators more opportunities > to work N6O/mm from rare grid DM02. The operation will last only one day. > > The decision was announced over the AMSAT Twitter and Facebook accounts. I > don't recall or can't find if it was posted on the -BB. Might be a good > idea for next time. > > 73 > Fernando KF7R > > On Sun, Sep 22, 2019, 12:52 AM Perry Yantis via AMSAT-BB < > amsat-bb(a)amsat.org> wrote: > >> I stayed up late tonight to work AO92 L/V mode only to find that it was >> still in L/V mode.Then I got on EO88 a few minutes later and was told that >> L/V mode would be on Wednesday this week.It would be nice it this >> information was posted on the BBS BEFORE the weekend gets here.Also why the >> change anyway????? >> Perry WB8OTH >> >> py41(a)att.net >> sent from my Apple Macbook Pro >> _______________________________________________ >> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available >> to all interested persons worldwide without requiring membership. >> Opinions expressed >> are solely those of the author, and do not reflect the official views of >> AMSAT-NA. >> Not an AMSAT-NA member? Join now to support the amateur satellite program! >> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb >> >

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AO92 L/V mode??
by Perry Yantis 20 Feb '20

20 Feb '20

I stayed up late tonight to work AO92 L/V mode only to find that it was still in L/V mode.Then I got on EO88 a few minutes later and was told that L/V mode would be on Wednesday this week.It would be nice it this information was posted on the BBS BEFORE the weekend gets here.Also why the change anyway????? Perry WB8OTH py41(a)att.net sent from my Apple Macbook Pro

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SSTV on Linears
by Roy Dean 31 Dec '19

31 Dec '19

> > I did some SSTV years ago via AO-40. Really fun. But with a LEO > satellite, you will need to be actively adjusting for Doppler shift in > real time, as SSTV is frequency sensitive. You might try some of the > faster modes, especially since a pass is over in just a few minutes. Greg > KO6TH I just did a dry run with my station, and think I'm ready to try an actual pass. I will be operating in "Robot36" mode on CAS-4B (17:00z) and CAS-4A (17:30z) this afternoon as first attempt. I plan on shooting for the lower portion of the 2m passband (going to target the lowest published downlink frequency). I will likely announce several times prior to first transmitting to fine tune. My test image is very simple black and white call/grid. If anybody hears it, please feel free to respond with an image (short notice, I know), or voice. If you don't hear me, then something came up to pull me away from my computer or I simply can't get in. --Roy K3RLD

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A21EME Video
by M5AKA 31 Dec '19

31 Dec '19

December 2019 issue of OSCAR News is now available for e-members to download https://amsat-uk.org/2019/12/31/december-2019-oscar-news/ A21EME Moonbounce and QO-100 Dxpedition video https://amsat-uk.org/2019/12/27/a21eme-moonbounce-qo100/ TF3YOTA active on Es’hail-2 / QO-100 satellite https://amsat-uk.org/2019/12/20/tf3yota-active-on-eshail-2-qo-100-satellite/ CAMSAT CAS-6 satellite launched December 20 https://amsat-uk.org/2019/12/19/camsat-cas-6-satellite/ Trevor M5AKA ---- AMSAT-UK http://amsat-uk.org/ Twitter https://twitter.com/AmsatUK Facebook https://facebook.com/AmsatUK YouTube https://youtube.com/AmsatUK ----

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Re: [amsat-bb] SSTV on Linears
by Roy Dean 31 Dec '19

31 Dec '19

Here is some additional information: CAS-4B: https://network.satnogs.org/observations/1469843/ Here you can see two SSTV transmissions starting at about 150s. I see no impact on the ongoing qso's going on higher up the passband. CAS-4A: https://network.satnogs.org/observations/1469844/ Here there is an SSTV transmission at about 200s, also doesn't seem to impact the ongoing qsos. And yes - all of this was in SSB. I suppose a trial in NFM would really cause havoc on the transponder. --Roy K3RLD

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Re: [amsat-bb] SSTV on Linears
by Roy Dean 31 Dec '19

31 Dec '19

> > Roy, Have you checked this out with the control ops? I don't know but are > there > any duty cycle issues to worry about? And given that a linear transponder > has a finite power budget what does it do to the other users? Maybe not a > big deal but I wonder if the sys ops for these birds have any words of > wisdom for us before we all start cranking up MMSSTV and banging away. John I have not. However I did just try it out and was monitoring the pass band and did not see any adverse affect. In fact, there were QSO's going on simultaneously that were very strong (stronger than my signal, for sure). At one point, it did seem as though somebody may have been doing something that was affecting the downlink (but it wasn't me as I wasn't Tx'ing at the time) - as it was a very wide signal that sort of sounded like it could have been SSTV splatter. Could have been local QRM, too. At the start of the first pass I received a partial image from another operator that was very nice (I just didn't pick up the signal until the image was completing). I also decoded my downlink after the pass and one came in very nicely and the other was recognizable but I think a frequency shift caused a decode hiccup that introduced interesting patterns and colors. I didn't get any "good" decodes from the second pass, but I'm wondering if I can do some post processing of the recorded file to shift the audio frequencies (they decode, but again stange colors and patterns - but can still make out text on solid backgrounds). I took some screen grabs of the passband during transmission, and it looks pretty good. At one point I had my power down to "3" on my 706MKIIG, which should be about 7 watts out of the transceiver (through 50 ft of RG-8X, an auto switching LNA, MFJ 916b, and another 6ft of LMR-240UF) and I was still getting in (and heard on the downlink). I'll reserve further linear SSTV operations until we've had a chance to discuss the opportunity (and/or abuse). It is definitely a challenge, and could be a lot of fun. Not sure how possible it would be with manual tuning, though. --Roy K3RLD

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Has AO-85 finally bit the dust?
by Ronald Parsons 31 Dec '19

31 Dec '19

Last heard report was almost 2 days ago. Before that, the downlink frequency was wobbling +- 5-10 kHz. Ron W5RKN

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Upcoming ARISS Contact Schedule as of 2019-12-31 14:30 UTC
by aj9n＠aol.com 31 Dec '19

31 Dec '19

Upcoming ARISS Contact Schedule as of 2019-12-31 14:30 UTC Quick list of scheduled contacts and events: Worldwide ARISS commemorative SSTV operation runs from Dec 28 (11:00 UTC is the setup time) until Jan 1, 2020 (18:20 UTC when the system is scheduled for shutdown). (***) Transmissions should be on the standard frequency of 145.800 MHz and in the PD 120 format. Once again, ARISS has had an outstanding year of contacts. We would especially like to thank the hardworking telebridge ground stations for their help: IK1SLD, K6DUE, LU8YY, ON4ISS, VK4KHZ, VK5ZAI, VK6MJ, and W6SRJ. (***) The ARISS webpage is at https://www.ariss.org/ Note that there are links to other ARISS websites from this site. The main page for Applying to Host a Scheduled Contact may be found at https://www.ariss.org/apply-to-host-an-ariss-contact.html ARISS Contact Applications (United States) Note, all times are approximate. It is recommended that you do your own orbital prediction or start listening about 10 minutes before the listed time. All dates and times listed follow International Standard ISO 8601 date and time format YYYY-MM-DD HH:MM:SS The complete schedule page has been updated as of 2019-12-31 14:30 UTC. (***) Here you will find a listing of all scheduled school contacts, and questions, other ISS related websites, IRLP and Echolink websites, and instructions for any contact that may be streamed live. https://www.amsat.org/amsat/ariss/news/arissnews.rtf https://www.amsat.org/amsat/ariss/news/arissnews.txt The successful school list has been updated as of 2019-12-21 03:00 UTC. https://www.amsat.org/amsat/ariss/news/Successful_ARISS_schools.rtf The ARISS webpage is at https://www.ariss.org/ Note that there are links to other ARISS websites from this site. The main page for Applying to Host a Scheduled Contact may be found at https://www.ariss.org/apply-to-host-an-ariss-contact.html ARISS Contact Applications (United States) The ARISS webpage is at https://www.ariss.org/ Note that there are links to other ARISS websites from this site. Message to US Educators Amateur Radio on the International Space Station Contact Opportunity Call for Proposals Upcoming Proposal Window is February 1, 2020 to March 31, 2020 The Amateur Radio on the International Space Station (ARISS) Program is seeking formal and informal education institutions and organizations, individually or working together, to host an Amateur Radio contact with a crew member on board the ISS. ARISS is happy to announce a proposal window will open February 1, 2020 for contacts that would be held between January 1, 2021 and June 30, 2021. Crew scheduling and ISS orbits will determine the exact contact dates. To maximize these radio contact opportunities, ARISS is looking for organizations that will draw large numbers of participants and integrate the contact into a well-developed education plan. The proposal window for contacts between January 1, 2021 and June 30, 2021 will open on February 1, 2020 and close on March 31, 2020. Proposal information and documents can be found at www.ariss.org. Two ARISS Introductory Webinar sessions will be held on November 7, 2019. The first is at 6:00 PM ET and the second is at 9:00 PM ET. The same material will be covered during both sessions, so choose the session that best fits your schedule. The Eventbrite link to sign up is https://ariss-introductory-webinar-fall-2019.eventbrite.com . The Opportunity Crew members aboard the International Space Station will participate in scheduled Amateur Radio contacts. These radio contacts are approximately 10 minutes in length and allow students to interact with the astronauts through a question-and-answer session. An ARISS contact is a voice-only communication opportunity via Amateur Radio between astronauts and cosmonauts aboard the space station and classrooms and communities. ARISS contacts afford education audiences the opportunity to learn firsthand from astronauts what it is like to live and work in space and to learn about space research conducted on the ISS. Students also will have an opportunity to learn about satellite communication, wireless technology, and radio science. Because of the nature of human spaceflight and the complexity of scheduling activities aboard the ISS, organizations must demonstrate flexibility to accommodate changes in dates and times of the radio contact. Amateur Radio organizations around the world with the support of NASA and space agencies in Russia, Canada, Japan and Europe present educational organizations with this opportunity. The ham radio organizations' volunteer efforts provide the equipment and operational support to enable communication between crew on the ISS and students around the world using Amateur Radio. More Information For proposal information and more details such as expectations, proposal guidelines and proposal form, and dates and times of Information Webinars, go to www.ariss.org. Please direct any questions to ariss.us.education(a)gmail.com. About ARISS: Amateur Radio on the International Space Station (ARISS) is a cooperative venture of international amateur radio societies and the space agencies that support the International Space Station (ISS). In the United States, sponsors are the Radio Amateur Satellite Corporation (AMSAT), the American Radio Relay League (ARRL), the ISS National Lab and National Aeronautics and Space Administration (NASA). The primary goal of ARISS is to promote exploration of science, technology, engineering, and mathematics (STEAM) topics by organizing scheduled contacts via amateur radio between crew members aboard the ISS and students in classrooms or public forms. Before and during these radio contacts, students, educators, parents, and communities learn about space, space technologies, and amateur radio. For more information, see www.ariss.org. ******************************************************************************** ARISS Contact Applications (Europe, Africa and the Middle East) Schools and Youth organizations in Europe, Africa and the Middle East interested in setting up an ARISS radio contact with an astronaut on board the International Space Station are invited to submit an application from September to October and from February to April. Please refer to details and the application form at www.ariss-eu.org/school-contacts. Applications should be addressed by email to: school.selection.manager(a)ariss-eu.org ARISS Contact Applications (Canada, Central and South America, Asia and Australia and Russia) Organizations outside the United States can apply for an ARISS contact by filling out an application. Please direct questions to the appropriate regional representative listed below. If your country is not specifically listed, send your questions to the nearest ARISS Region listed. If you are unsure which address to use, please send your question to the ARISS-Canada representative; they will forward your question to the appropriate coordinator. For the application, go to: https://www.ariss.org/ariss-application.html. ARISS-Canada and the Americas, except USA: Steve McFarlane, VE3TBD email to: ve3tbd(a)gmail.com ARISS-Japan, Asia, Pacific and Australia: Satoshi Yasuda, 7M3TJZ email to: ariss(a)iaru-r3.org, Japan Amateur Radio League (JARL) https://www.jarl.org/ ARISS-Russia: Soyuz Radioljubitelei Rossii (SRR) https://srr.ru/ ****************************************************************************** ARISS is always glad to receive listener reports for the above contacts. ARISS thanks everyone in advance for their assistance. Feel free to send your reports to aj9n(a)amsat.org or aj9n(a)aol.com. Listen for the ISS on the downlink of 145.8Ø MHz. ******************************************************************************* All ARISS contacts are made via the Kenwood radio unless otherwise noted. ******************************************************************************* Several of you have sent me emails asking about the RAC ARISS website and not being able to get in. That has now been changed to https://www.ariss.org/ Note that there are links to other ARISS websites from this site. **************************************************************************** Looking for something new to do? How about receiving DATV from the ISS? Please note that the HamTV system has been brought back to earth for troubleshooting. Please monitor ARISS-EU or ARISS-ON for the very latest news on the troubleshooting efforts. If interested, then please go to the ARISS-EU website for complete details. Look for the buttons indicating Ham Video. http://www.ariss-eu.org/ If you need some assistance, ARISS mentor Kerry N6IZW, might be able to provide some insight. Contact Kerry at kbanke(a)sbcglobal.net The HamTV webpage: https://www.amsat-on.be/hamtv-summary/ **************************************************************************** ARISS congratulations the following mentors who have now mentored over 100 schools: Francesco IKØWGF with 140 (***) Satoshi 7M3TJZ with 136 Sergey RV3DR with 131 Gaston ON4WF with 123 **************************************************************************** The webpages listed below were all reviewed for accuracy. Out of date webpages were removed, and new ones have been added. If there are additional ARISS websites I need to know about, please let me know. Total number of ARISS ISS to earth school events is 1374. Each school counts as 1 event. Total number of ARISS ISS to earth school contacts is 1307. Each contact may have multiple schools sharing the same time slot. Total number of ARISS supported terrestrial contacts is 48. A complete year by year breakdown of the contacts may be found in the file. https://www.amsat.org/amsat/ariss/news/arissnews.rtf Please feel free to contact me if more detailed statistics are needed. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The following US states and entities have never had an ARISS contact: South Dakota, Wyoming, American Samoa, Guam, Northern Marianas Islands, and the Virgin Islands. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ QSL information may be found at: https://www.ariss.org/qsl-cards.html ISS callsigns: DPØISS, IRØISS, NA1SS, OR4ISS, RSØISS **************************************************************************** Frequency chart for packet, voice, and crossband repeater modes showing Doppler correction as of 2005-07-29 04:00 UTC https://www.amsat.org/amsat/ariss/news/ISS_frequencies_and_Doppler_correcti… Check out the Zoho reports of the ARISS contacts https://reports.zoho.com/ZDBDataSheetView.cc?DBID=412218000000020415 **************************************************************************** Exp. 59 on orbit Christina Koch Exp. 60 on orbit Luca Parmitano KF5KDP Alexander Skvortsov Drew Morgan KI5AAA Exp. 61 on orbit Oleg Skripochka Jessica Meir **************************************************************************** 73, Charlie Sufana AJ9N One of the ARISS operation team mentors

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