QB50 Mission – downlink frequency details

EO-79 and EO-80 - Image Credit ISISThe first of the QB50 CubeSats that are destined for deployment from the International Space Station are now awaiting their turn to be uplifted to the ISS.

In addition to the ISS deployments it is planned that there will be two further batches launched using other vehicles.

The exact timing of these events is not yet available but, in advance, here is a fully updated list of all CubeSats involved. Also included are the details of their science experiments and their downlink frequencies and modulation modes. The frequencies have been coordinated by the IARU Frequency Coordination team and, generally, all the spacecraft will use 9k6 data rates on 70cms.

Download the QB50 Frequency Excel Spreadsheethttp://tinyurl.com/QB50-Frequencies-20170201

AMSAT-UK: https://amsat-uk.org/
Twitter: https://twitter.com/AmsatUK
Facebook: https://facebook.com/AmsatUK
YouTube: https://youtube.com/AmsatUK

EO-79 transponder activation

EO-79 and EO-80 - Image Credit ISIS

EO-79 and EO-80 – Image Credit ISIS

On December 21, 2015 at 1038 UT, the EO-79 transponder was turned on for a prolonged period.

The FUNcube transponder subsystem on QB50p1 (EO-79) had been provided by AMSAT-UK and AMSAT-NL and is a similar subsystem as on FUNcube-1, but without the telemetry downlink circuitry.

The current software running on EO-79 does experience occasional reboots. When these reboots happen, the transponder is automatically turned off and will have to be turned back on by a command station. The FUNcube team has selected a few command stations to do so, but be advised the transponder may be off.

TLEs:
AMSAT keps name: EO-79
Celestrak keps Name: QB50P1
Celestrak file: cubesat.txt
NORAD #    40025
COSPAR designator    2014-033-R

Frequencies:
*Uplink:* 435.035-435.065 MHz LSB [See note below]
*Downlink:* 145.935-145.965 MHz USB

EO-79 has been set to only beacon the normal AX.25 beacon every 30 seconds instead of 10 seconds. The beacon frequency is 145.815 MHz and consists of AX.25 frames on BPSK. More details about the downlink can be found on the ISIS Ham Radio page at http://isispace.nl/HAM/qb50p.html

We kindly request you to share your experiences with the AMSAT Bulletin Board so everyone can benefit from operating tips and tricks, as well as being up-to-date on the status.

We would also welcome any observation related to the transponder behaviour when the AX.25 beacon comes on.

Just like FUNcube-1, the crystal oscillator circuits exhibit drift with temperature. This means manual tuning will probably work best.

Lastly, the commanding team will not be available over Christmas, so the current activations are planned from today until Thursday 24th and from Monday 28th until Thursday 31st

73 and have FUN
Happy Holidays

Wouter Weggelaar, PA3WEG
AMSAT-NL
AMSAT-UK

Mike Seguin N1JEZ notes:  I found my downlink after setting my uplink +12 kHz from published spec

SatPC32 tracking software Doppler SQF information used by Peter VK4NBL:
EO-79,145950,435063,USB,LSB,REV,0,0
EO-79,145814.8,435070,CW,TELEMETRY,0,0

Graham Shirville G3VZV says that due to platform sharing considerations the FUNcube transponder on EO-79 uses 1/4 wave monopole antennas rather than the full dipoles used on AO-73. The actual effects of this difference in practice may be interesting to observe.

AMSAT Bulletin Board (AMSAT-BB) http://www.amsat.org/mailman/listinfo/amsat-bb

Satellite Tracking https://amsat-uk.org/beginners/satellite-tracking/

JE9PEL QB50 CubeSat Spreadsheet

Planet Lab Dove CubeSats leaving the Nanoracks Deployer on February 11, 2014

Planet Lab Dove CubeSats leaving the ISS Nanoracks Deployer on February 11, 2014

The QB50 constellation of  fifty CubeSats should be shipped to the International Space Station (ISS) in December 2016 for subsequent deployment.

QB50p1 and QB50p2 Precursor 2U CubeSats - Image Credit ISIS

QB50p1 and QB50p2 Precursor 2U CubeSats – Image Credit ISIS

The CubeSats are planned to be deployed from the ISS using the Japanese Experiment Module (JEM) and the Nanoracks CubeSat Deployers.

Eight NanoRacks deployers are installed on the Multi-Purpose Experiment Platform (MPEP). Each deployer has a capacity of 6U and so can hold up to six 1U, three 2U or two 3U CubeSats. They are carried by Japanese Experiment Module-Remote Manipulator System (JEM-RMS).

Mineo Wakita JE9PEL has made available a spreadsheet showing the 50 satellites and their frequencies. A copy can be downloaded from the JE9PEL site.

QB50 project https://www.qb50.eu/

QB50 CubeSats to be deployed from ISS
https://amsat-uk.org/2015/09/08/qb50-cubesats-to-be-deployed-from-iss/

Launch of QB50 precursor CubeSats QB50p1 (EO-79) and QB50p2 (EO-80)
https://amsat-uk.org/2014/06/19/successful-launch-of-amateur-radio-satellite-payloads/

January 2014 original QB50 CubeSat launch contract signed
https://amsat-uk.org/2014/01/28/qb50-cubesat-launch-contract-signed/

Mineo Wakita JE9PEL satellite frequency list http://www.ne.jp/asahi/hamradio/je9pel/satslist.htm

QB50 CubeSats to be deployed from ISS

Planet Lab Dove CubeSats leaving the Nanoracks Deployer on February 11, 2014

Planet Lab Dove CubeSats leaving the ISS Nanoracks Deployer on February 11, 2014

It has been announced that the fifty CubeSat QB50 constellation should be shipped to the International Space Station (ISS) in July 2016 for subsequent deployment. It had been planned for them to be launched by Alcantara Cyclone Space, a joint venture between the governments of Ukraine and Brazil, but that option is not longer available.

QB50p1 and QB50p2 Precursor 2U CubeSats - Image Credit ISIS

QB50p1 and QB50p2 Precursor 2U CubeSats – Image Credit ISIS

The AlbertaSat website reports on the 9th QB50 Workshop, held September 8, 2015 in Liège, Belgium. The CubeSats are now planned to be deployed from the ISS using the Japanese Experiment Module (JEM) and the Nanoracks CubeSat Deployers.

Eight NanoRacks deployers are installed on the Multi-Purpose Experiment Platform (MPEP). Each deployer has a capacity of 6U and so can hold up to six 1U, three 2U or two 3U CubeSats. They are carried by Japanese Experiment Module-Remote Manipulator System (JEM-RMS).

AlbertaSat provide an update on the QB50 precursor CubeSats P1/P2 which were launched in 2014. The first payload is working, and while it has been resetting, no damage appears to have occurred. It is possible that the second payload is damaged, but it is still functioning.

Representatives from QB50 also took the time to clearly define their goals and specify the details of the project. The project aims to probe probe thermosphere with about 40 sensors which study atmospheric science. These sensors include the Langmuir Probes that will be on Ex Alta-1. 40 CubeSats will be fitted with one of these sensors. The other 10 CubeSats will have in-orbit demonstrations.

QB50 project https://www.qb50.eu/

Launch of QB50 precursor CubeSats QB50p1 (EO-79) and QB50p2 (EO-80)
https://amsat-uk.org/2014/06/19/successful-launch-of-amateur-radio-satellite-payloads/

January 2014 original QB50 CubeSat launch contract signed
https://amsat-uk.org/2014/01/28/qb50-cubesat-launch-contract-signed/

AlbertaSat
http://albertasat.ca/
https://www.facebook.com/AlbertaSa

Activation of linear transponder on EO-79

QB50p1 and QB50p2 - Image Credit ISIS

QB50p1 and QB50p2 – Image Credit ISIS

The AMSAT-NL transponder on EO-79 is being activated to support the International Lighthouse and Lightship Weekend (ILLW).

On the AMSAT Bulletin Board Wouter PA3WEG posted:

We apologize for the short notice, this opportunity came along very last minute, and again we took it.

QB50p1 (EO-79) carries the FUNcube-3 400 mW inverting linear 435/145 MHz SSB/CW transponder provided by AMSAT-NL with support from AMSAT-UK.

• 435.035-435.065 MHz LSB Uplink
• 145.935-145.965 MHz USB Downlink

TLEs are NORAD # 40025, COSPAR designator 2014-033-R

Remember that the FUNcube family of transponders do not need much power to work them.

I will be operating at Scheveningen Lighthouse PA25SCH, NL0025

Thanks to the Von Karman Institute and Innovative Solution In Space for the opportunity to use the transponder.

Have FUN over the weekend!

Wouter PA3WEG
AMSAT-NL

International Lighthouse and Lightship Weekend (ILLW)
http://www.illw.net/
https://www.facebook.com/ILLWeekend

QB50p2 FM Transponder Tested

QB50p1 and QB50p2 - Image Credit ISIS

QB50p1 and QB50p2 – Image Credit ISIS

AMSAT-Francophone report that the FM transponder on QB50p2 (EO-80) has been tested. A Google English translation of the post on their website reads:

On June 19, 2014, two 2U CubeSats QB50p1 and QB50p2 were launched as part of the QB50 precursor program into a polar orbit at an altitude of 680 km.

The satellite QB50p2 (object 40032) is equipped with a secondary FM transponder payload developed by AMSAT-F.

On Tuesday, June 16, 2015 almost 1 year after launch the AMSAT-F FM transponder on QB50p2 was activated by the main control station in The Netherlands for the duration of an orbit. At the Polytechnique in Palaiseau, we were able to receive telemetry in CW and put into action the FM transponder with an output of 1.5W.

A very strong signal was received at Palaiseau and by F6HCC in Brittany. The transponder was turned off at the end of the orbit.

In a few weeks, the transponder should be activated permanently. The signal is very strong, we will probably use a lower power level of 500 mW or 1 watt. We will inform you later.

QB50p1 (EO-79 / FUNcube-3) is equipped with a linear transponder for SSB and CW. The first tests were successfully completed in April and its transponder should also be enabled full-time in a few weeks.

Gérard – F6FAO

QB50 Amateur Radio Information https://www.qb50.eu/index.php/precursor-amateur-radio-operator

AMSAT-Francophone http://tinyurl.com/AMSAT-Francophone

The IARU Satellite Frequency Coordination Panel Status pages list these frequencies for the two satellites:

QB50p1 (FUNcube-3) has a VHF 9600 bps BPSK telemetry downlink plus a linear U/V transponder for SSB/CW communications similar to that already flying on FUNcube-1 with an output of 400 mW.
• 145.815 MHz 9600 bps BPSK telemetry beacon
• Inverting SSB/CW linear transponder 400 mW PEP
– 435.035 – 435.065 MHz Uplink LSB
– 145.965 – 145.935 MHz Downlink USB

QB50p2 has  a VHF 9600 bps BPSK telemetry downlink plus a separate RF payload from AMSAT-Francophone which will comprise of a FM voice transponder with UHF uplink and VHF downlink. It can also transmit FX25 telemetry at 9600 bps.
• 145.880 MHz 9600 bps BPSK telemetry beacon
• 145.840 MHz 9600 bps FSK FX25

To use the FM voice transponder Paul Stoetzer N8HM suggests programming these frequencies into your rig’s memories:

EO-80 AOS - TX 435.070 MHz 210.7 Hz CTCSS, RX 145.840 MHz
EO-80 2   - TX 435.075 MHz 210.7 Hz CTCSS, RX 145.840 MHz
EO-80 TCA - TX 435.080 MHz 210.7 Hz CTCSS, RX 145.840 MHz
EO-80 4   - TX 435.085 MHz 210.7 Hz CTCSS, RX 145.840 MHz
EO-80 LOS - TX 435.090 MHz 210.7 Hz CTCSS, RX 145.840 MHz

AOS = Aquisition Of Signal. TCA = Time of Closest Approach. LOS = Loss Of Signal

OSCAR Numbers for QB50p1 and QB50p2 CubeSats
https://amsat-uk.org/2014/07/02/oscar-numbers-for-qb50p1-and-qb50p2-cubesats/