March 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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TLEdoctor program to check for preliminary TLE data
by Jarda 06 Aug '19

06 Aug '19

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

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Fw: AO73 Mode change
by Graham Shirville 11 Jun '19

11 Jun '19

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

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JY1-sat dashboard
by Kevin 15 Apr '19

15 Apr '19

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

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New Telemetry Decoder for FalconSat-3
by Chris Thompson 10 Apr '19

10 Apr '19

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

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Satellite Pass Audio Recordings
by Chris Pohlad-Thomas 31 Mar '19

31 Mar '19

Can someone remind me of the website where you can go to access satellite recordings from recent passes? -- Chris Pohlad-Thomas

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AISAT APRS payload on PS4 Platform
by Nitin Muttin 31 Mar '19

31 Mar '19

Hello All, An APRS payload from AMSAT INDIA will be flown on PSLV C45. The launch is scheduled on April 1st 2019 at 09:27 IST / 03:57 UTC. The payload will be powered on approximately over Sweden,Norway,Denmark, Finland, Poland and Moscow.We request stations at these locations to report the first signals (145.825 Mhz) from the payload.We also request the Amateur Radio fraternity worldwide to use the payload and Satgates to feed the traffic. More details about this unique project is available at http://www.amsatindia.org The prelaunch TLE are also available for download on http://www.amsatindia.org 73 Nitin [VU3TYG]Secretary, AMSAT INDIA

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Pictures Of New FT-897D For Sale Posted
by Tony 31 Mar '19

31 Mar '19

All: Pictures of the new FT-897D I have for sale can be found here: https://www.youtube.com/watch?v=HMT7wqqNjjM Sale goes to buyer with the best offer. Please contact me direct: dxdx(a)optonline.net Payment must be via Paypal. Shipped to U.S. buyers Only Thank you, Tony

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For Sale: Yaesu FT-897D New In The Box
by Tony 31 Mar '19

31 Mar '19

All: I purchased a new unopened box Yaesu FT-897D from an estate sale. It came with the FP-30 A/C power supply and a Yaesu 300 Hz CW filter that was also unopened in the box. I tested the radio and it looks and functions like a new transceiver. It's an all-mode HF, 50/144/430 MHz radio that comes with 60 meters and the TXCO from the factory. It can be used with internal batteries or the internal FP-30 A/C power supply that it came with. It's not a full-duplex VHF/UHF transceiver but can be used with satellites. I can provide pictures for those interested. My email address is: dxdx(a)optonline.net Tony -K2MO

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