AMSAT-BB March 2018

145 participants
179 discussions

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

3 years, 3 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, 5 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, 8 months

EQUiSat Optical Beacon CubeSat

by Trevor .

Students at the Ivy League Brown University are developing an amateur radio satellite EQUiSat that will carry a Xenon Flash Tube (XFT) subsystem to act as an Optical Beacon that should be visible to the unaided eye of observers on Earth. See http://www.uk.amsat.org/?p=10635 73 Trevor M5AKA AMSAK-UK http://www.amsat-uk.org/ ----

4 years, 1 month

2018 symposium?

by w4upd

Any idea of when and where the 2018 Symposium is going to be? The Amsat website still shows 2017. Reid, W4UPD

4 years, 7 months

AO73/FUNcube-1 Operations

by Graham Shirville

Hi All, AO73 is now seeing short eclipse periods of around 15 minutes every orbit. The spacecraft is now operating in autonomous mode. ie: full power tlm when in the sun and with the transponder on when in eclipse. The transponder will be switched to continuous operation on Thursday morning. Have fun 73 Graham G3VZV

4 years, 7 months

Using 1.2Ghz

by Todd

Thinking about adding the 1.2Ghz module for my 9100. Prices have dropped a little and units will start become harder to find once production ends. Anybody using this band? I read it's used as a uplink frequency for some satellites. Any input appreciated.ToddAL7PX

4 years, 7 months

FoxTelem Java question

by Peter Green

I’m new to receiving FoxTelem. I have it running on a Mac with a Funcube dongle. The Mac is running High Sierra 10.13.3 and Java 8 update 161. I have had some success with AO-85 and AO-91 but none with AO-92. The instruction manual says that I should use Java 6, however this is no longer available and not supported. Is it that the instructions are out of date, or can I acquire Java 6 form somewhere or is Java 8 OK? Every thing seems to work with the FoxTelem application (Ver 1.06q_m) Any hints or tips greatly appreciated. Many thanks Pete G0ABI

4 years, 8 months

:Re: Any amateur satellites above 70cm band (microwave bands) ?

by MICHAEL WILLIAMS

DTUSat-2 (object 40030) is operating at 2401.835 MHz sending a full or partial beacon every 30 seconds. Since the Doppler is 100 KHz over the entire pass, it's tricky copying it with a traditional receiver such as an FT-847 (Doppler correction has to be right on). It's best seen with a SDR. Since its batteries are dead, it signals cannot be heard in eclipse. Its in an almost perfect polar orbit and can be copied around noon daily everywhere on earth. It is listed in the AMSAT keps and pass predictions. Also see http://wakky.asablo.jp/blog/ Also, I've heard that the ISS sends out a very strong video carrier at 2395 MHz (my converter will not tune that low). I asked a ham in Italy to check it out and he indicated it is always on. I hope this helps. Mike (K9QHO)

4 years, 8 months

Re: [amsat-bb] Tiangong Re-entry on Heavens bove

by Ted Krempa

Hi Bob, do you know the object number by chance? Thanks Ted K7TRK -----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Robert Bruninga Sent: Saturday, March 31, 2018 9:16 AM To: amsat bb Cc: TAPR APRS Mailing List Subject: [amsat-bb] Tiangong Re-enetry on Heavens bove You can see the live track of Taengong to re-enter in the next 24 hours on http://www.heavens-above.com/ Just remember, as it suffers increased drag, it will speed up and be ahead of classic predictions. But at least you can see when you are under the orbit as to whether it is worth going outside. I 'd go out several minutes before the prediction since we dont know how quickly they are updating the elements as it speeds up. and even if it is daytime, you will see it if it comes in in your area... Bob _______________________________________________ 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

4 years, 8 months

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AMSAT-BB March 2018