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

15-10m satellite transponders to be launched
by Ray Soifer 12 Apr '19

12 Apr '19

IARU has coordinated two Chinese satellites, expected to be launched later this year, which will carry 15-to-10-meter linear transponders. If successful, these will be the first use of 15 meters for a satellite uplink since RS-12/13 went silent in 2002. Operation of the earlier RS birds enabled much DX to be worked on otherwise dead bands. More info to follow. As a reminder, DX worked via satellite counts for Satellite DXCC, but not for other DXCC awards. 73 Ray W2RS

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AISAT-1 PS4 antenna configuration ?
by KC9SGV 12 Apr '19

12 Apr '19

If they use one antenna for both AIS and APRS... (APRS was added as an afterthought, completed in six days, just a box, no antenna, no battery, no power panels.) If this is the case, AIS has thousands of ships all trying to work the antenna automatically. There are only a few hams trying to work APRS through the same antenna per pass. Without proper diplexing, how would this system not be blind to APRS ? AIS is ~160 MHz for ship to shore connections. Not sure what the sat connection freq would be for AIS. Maybe it is time for AMSAT India and Exseedspace to inform us hams here ? KC9SGV Sent from my iPad

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AISAT-1 PS4 antenna configuration ?
by KC9SGV 12 Apr '19

12 Apr '19

So, in researching AIS, the time slot phenomenon is telling.. AIS knows when to transmit, in order not to get bumping transmissions. On an antenna where both AIS and APRS operates...(IF this the case, and we do not at the moment have further information about the fourth stage setup), AIS transmissions to and from the ships are time slotted. But what about the random APRS transmissions ? Maybe APRS telemetry and position beaconing from the sat could be time slotted in with the AIS transmissions from the sat. But what about APRS message uploads from hams ? Am I overthinking this, or are there indeed separate antennas for AIS and APRS on this rocket fourth stage ? https://www.navcen.uscg.gov/?pageName=AISworks KC9SGV Sent from my iPad

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ISS SSTV this weekend
by mark sklaney 12 Apr '19

12 Apr '19

If you guys can contact NASA or the ISS tell them their audio is very very low on the SSTV pictures. There signal is full scale on my radio but the audio can barely be heard... Tell them to tun up their audio input on their radio.. Other than that they will be wasting everyone's time trying to get good pictures.. Thanks Mark WB3FKP

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NASA Rover competition live feed
by Mark L. Hammond 12 Apr '19

12 Apr '19

Hi All, you might enjoy watching some of this competition at Huntsville, AL. We at Campbell University started an engineering program just 3 years ago--and we have two teams in the competition this year! Teams # 76 and 77. Go Camels! ;) http://www.ustream.tv/channel/nasa-msfc 73, -- Mark L. Hammond [N8MH]

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FM Sats from DN08
by Scott Harvey 12 Apr '19

12 Apr '19

Myself, Kell, KI7UXT and maybe others in our group will be operating FM and APRS satellite holiday style and depending on weather from DN08, in NE Washington this weekend. 73, Scott, KA7FVV Director - KBARA kbara.orgAlternate Board of Director - AMSAT amsat.org Co-Owner WA7DRE 443.525 System Fusion Repeater Co-Owner KA7FVV 147.320 KBARA Repeater http://www.ka7fvv.net

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ESEO (FUNcube-4) Beacon Active + 76 GHz CubeSat
by M5AKA 12 Apr '19

12 Apr '19

The ESEO (FUNcube-4) 1200 bps BPSK telemetry beacon on 145.895 MHz was activated at 1040 UT on Friday, April 12, 2019 https://amsat-uk.org/2019/03/22/eseo-satellite-commissioning-starts/ See ESEO Real-Time Data in the AMSAT-UK Data Warehouse at http://data.amsat-uk.org/ui/eseo Download the ESEO (FUNcube-4) Dashboard App from https://funcube.org.uk/working-documents/funcube-telemetry-dashboard/ Australian CubeSat to use 76 GHz - launches July 2019 https://amsat-uk.org/2019/04/12/australian-cubesat-to-use-76-ghz/ 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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What happened to the ISS SSTV audio level?
by Greg D 12 Apr '19

12 Apr '19

Hi folks, Had a great pass at about Noon today, local time. Nice strong S9 signals, good audio, but my SSTV software didn't seem to want to decode it. No idea why. Trying again just now (1:36pm pass). Nice strong carrier, but the audio is almost nonexistent. Wah happen? Anybody else experience this? Greg KO6TH

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Re: [amsat-bb] What happened to the ISS SSTV audio level?
by Roy Dean 12 Apr '19

12 Apr '19

I've been informed that the CW I shared is indeed the RS0ISS callsign. --Roy K3RLD > I recorded this CW at the end of the 22:30z pass yesterday. > https://clyp.it/jjl1cj3g I had to amplify the level by like 20db in some > spots to make it readable. > But I don't know CW, so not sure what it says. This CW came pretty much > when I was expecting the next image to start, but that image never came, > even though there was a minute or two left in the pass. --Roy > K3RLD

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Re: [amsat-bb] What happened to the ISS SSTV audio level?
by Roy Dean 12 Apr '19

12 Apr '19

I recorded this CW at the end of the 22:30z pass yesterday. https://clyp.it/jjl1cj3g I had to amplify the level by like 20db in some spots to make it readable. But I don't know CW, so not sure what it says. This CW came pretty much when I was expecting the next image to start, but that image never came, even though there was a minute or two left in the pass. --Roy K3RLD

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