AMSAT-BB February 2019

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217 discussions

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cube sat model

by Bob- W7LRD

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

1 year, 1 month

AMSAT: RFI from LED bulbs?

by Robert Bruninga

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

1 year, 11 months

TLEdoctor program to check for preliminary TLE data

by Jarda

The program can easily detect and fix the TLE preliminary data errors for working in satellite programs after launching the satellite in orbit The original version of the program released before launching Fox-1D works in Windows-7 and higher. Version that works in Windows XP is now added. The program name for Win-XP changes to TLEdoctor. Both programs can be downloaded at http://oscar.ok2gz.eu/fox1d.php 73 Jarda ok2gz --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

2 years, 10 months

Fw: AO73 Mode change

by Graham Shirville

Hi folks, AO73/FUNcube is now in amateur mode for the weekend with the transponder on! Please see below for all FUNcube mission info 73s Graham G3VZV and the FUNcube team. ++++++++++++++++++++++++++++++++++ FUNcube frequencies and other details ++++++++++++++++++++++++++++++++++ AO-73 FUNcube-1 The transponder is normally operational only when the satellite is in eclipse, ie the solar panels are NOT being illuminated. During weekends (from pm Fridays UTC to PM Sundays UTC) the transponder is operational 24/7. When the transponder is switched off, the telemetry beacon is on full power, when the transponder is on the beacon it is on low power. During holidays, eg Christmas, New Year, Easter, etc, the transponder maybe activated for extended periods. Watch AMSAT-BB for announcements which are usually made on Friday evenings (UTC) The nominal transponder frequencies are: Uplink: 435.150 - 435.130 MHz LSB (Inverting) Downlink: 145.950 - 145.970 MHz USB Telemetry Tx: 145.935 MHz BPSK (The passband may be up to 15kHz higher depending on on-board temps. Lower temperatures give higher freqs!) FUNcube-2 (aka FUNcube on UKube) The FUNcube-2 sub-system continues to operate autonomously and, almost continuously, in amateur mode. The transponder is operational and the telemetry downlink is functioning with about 70mW output. The FUNcube-1 Dashboard does not correctly display the telemetry but it does correctly decode the data and uploads it to the FUNcube Data Warehouse from where it can be examined. Most of the real time data channels are operational and these include battery voltages, temperatures and ADCS data coming via the main On Board Computer (OBC). The transponder is interrupted for a few seconds every 2 minutes when the other transmitter sends its CW beacon and, occasionally, for a few seconds when the main OBC reboots (approx seven times each orbit). The nominal transponder frequencies are: Uplink: 435.080 - 435.060 MHz LSB (Inverting) Downlink: 145.930 - 145.950 MHz USB Telemetry Tx: 145.915 MHz BPSK (The passband may be up to 10kHz higher depending on on-board temps. Low temperatures give higher freqs!) EO79 FUNcube-3 Due to power budget constraints the transponder cannot be operational 24/7 and an orbit specific schedule has been developed. The transponder will commence operation 27 minutes after the spacecraft enters sunlight and will stay on for a period of 25 minutes. This schedule may be modified in future months as a result of experience. The nominal transponder frequencies are: Uplink: 435.0723-435.0473 MHz LSB (Inverting) Downlink: 145.946-145.971 MHz USB Further detailed info on EO79 transponder frequencies is at: https://amsat-uk.org/2016/11/10/eo79-funcube-3-transponder-commences-regula… EO88/Nayif-1/FUNcube-5 EO88 is presently operating in autonomous mode. The transponder is operational when the satellite is in eclipse, ie the solar panels are NOT being illuminated. When the transponder is switched off, the telemetry beacon is on full power, when the transponder is on the beacon it is on low power. The transponder frequencies are: Uplink: 435.045 – 435.015 MHz LSB (inverting) Downlink: 145.960-145.990 MHz USB Telemetry Tx: 145.940MHz All FUNcube transponders are sponsored by AMSAT-UK and AMSAT-NL. We are very grateful for the assistance given by Innovative Solution In Space Bv, The Netherlands. _______________________________________________ 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: http://www.amsat.org/mailman/listinfo/amsat-bb

3 years

JY1-sat dashboard

by Kevin

Hi All, Is anyone else noticing any issues with the JY1-sat dashboard? I can start it with the sat present and it will instantly lock and track, next pass it will ignore the signal, kill it and restart it and bam instant lock. 73 Kevin WA7FWF

3 years, 2 months

New Telemetry Decoder for FalconSat-3

by Chris Thompson

I've written a new Ground station for FalconSat-3. If you had an initial go with WISP without success or if you have never tried to decode FalconSat-3, now is a good time to try. This requires much less setup than WISP. And don't be put off if you don't have a hardware TNC, this will work with a soundcard TNC. Or, if you didn't try to listen to FalconSat-3 because you don't have a station that can transmit commands to the spacecraft, then read on. We still need your help to decode telemetry. In particular we would like to encourage people to download the Telemetry and forward it to an AMSAT telemetry server. Currently more telemetry is generated than we can download with AMSAT Operations ground stations. Receive only stations can contribute to that as well as stations equipped to transmit to FalconSat-3 and request files. You can see telemetry uploaded so far here: http://tlm.amsatfox.org/tlm/FalconSat-3 There are details about the spacecraft, how to install the software and how it works in the manual available if you download the software or online here: http://www.g0kla.com/pacsat/pacsat_ground_manual.pdf You can download the software at www.g0kla.com/pacsat/index.php. I have also written some blog posts and thoughts about the software for anyone interested. They are linked from the download page. There is much to do here of course and most of it probably won't get done. I would call this a beta release. If you have suggestions or bug fixes please log them online at https://github.com/ac2cz/Falcon/issues or send me an email. The software is open source. All the details are here: https://github.com/ac2cz/Falcon/ The telemetry processing and display leverages common code from FoxTelem in a library here: https://github.com/ac2cz/libTelem/ -- Chris E. Thompson chrisethompson(a)gmail.com g0kla(a)arrl.net

3 years, 2 months

FUNcube-1/AO73 Operations

by Graham Shirville

Hi All,Just to confirm that AO73 is now in continuous education mode with the high power telemetry. Amateur mode may be expected to resume on Thursday morning(UTC)73GrahamG3VZV

3 years, 3 months

QO-100 bare minimum: GPS referenced LNB + IC-402 (read: no dish, 70cm IF!)

by Michael Fletcher

https://www.youtube.com/watch?v=D7KwssbYMKY /Michael, oh2aue

3 years, 3 months

LVB TRACKER

by Rick Hardin

Hello, We need 2 LVB Tracker interfaces, does anyone have 1 or 2 that they can sell ? Thank you Rick kb4bsa rick(a)rickhardinjr.com Sent from Mail for Windows 10

3 years, 3 months

Call for Papers, Posters, Presentations for GNU Radio Conference 2019 - special focus on amateur radio and space communications!

by Michelle Thompson

Dear friends and fans of GNU Radio, GNU Radio Conference celebrates and showcases the substantial and remarkable progress of the world's best open source digital signal processing framework for software-defined radios. In addition to presenting GNU Radio’s vibrant theoretical and practical presence in academia, industry, the military, and among amateurs and hobbyists, GNU Radio Conference 2019 will have a very special focus. Summer 2019 marks the 50th anniversary of NASA's Apollo 11 mission, which landed the first humans on the Moon. GNU Radio Conference selected Huntsville, AL, USA as the site for GNU Radio Conference 2019 in order to highlight and celebrate space exploration, astronomical research, and communication. Space communications are challenging and mission critical. Research and development from space exploration has had and continues to have far-reaching effect on our communications gear and protocols. Please join us September 16-20, 2019 at the "Huntsville Marriott at the Space & Rocket Center" hotel for the best technical conference of the year! Amateur satellite communications has a central place. Registration and an online and mobile-friendly schedule will be posted at the conference web site: https://www.gnuradio.org/grcon/grcon19/ Call for All! We invite developers and users from the GNU Radio Community to present your projects, presentations, papers, posters, and problems at GNU Radio Conference 2019. Submit your talks, demos, and code! Please share this Call for All with anyone you think needs to read it. To submit your content for the conference, visit our dedicated conference submission site at: https://openconf.org/GRCon19/openconf.php First round closes 1 July 2019. If accepted, your content will be immediately scheduled. Final round closes 1 September 2019. Space permitting. Pun intended. If you have questions or need assistance with OpenConf, or have content that doesn't quite fit and you want to talk it over, please write grcon(a)gnuradio.org Topics may include but are not limited to: Space (including ground stations)* Amateur radio Radio astronomy Atmospheric research Theoretical work Practical applications Aviation Biomedical Citizen Science Digital Signal Processing Education Radio Interface Machine Learning Cognitive Radio Transportation Wireless security *special focus awards given to all accepted work with Space as a topic! -Michelle W5NYV

3 years, 3 months

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AMSAT-BB February 2019