FUNcube – Welcome to 2022

FUNcube-1 - Battery Voltage - Whole Orbit Data

FUNcube-1 – Battery Voltage – Whole Orbit Data

There are presently three FUNcube based missions in orbit – currently all of them have active, linear U/V transponders. The current status of each of these can always be checked on the useful AMSAT-NA status page and an update on each of them is provided below. Please have FUN using them!

AO73 – FUNcube1. As previously reported AO73 appears to be experiencing some power issues after 8+years in orbit.

The battery is not charging to the same voltage as it did up to early November last year. The spacecraft has experienced many months of continuous sunlight over the past couple of years and this has resulted in high (around +30C) onboard temperatures. This environment may have “cooked” the cells although presently we do not see any direct evidence of this.

We can see that the stable bus voltage indicated at the end of charge is now much lower and depends on the current being taken by the on-board systems. The solar panel currents appear to be similar to those recorded soon after launch. The current best theory is that we are seeing the effect of some increased resistance in the supply circuit between the eps charging circuit and the battery. Although we do not have access to a fully detailed circuit diagram of the EPS we believe that there is an “ideal diode” in this line to prevent discharge of the battery back through the EPS circuitry. We understand that this is actually a MOSFET device and the suspicion is that this may now be showing signs of radiation damage.

So an operational mode has been selected that can be hopefully sustained for some time. From today AO73 is in continuous transponder mode and is available for use 24/7. Low power telemetry is also being transmitted and reports of the data are very welcome via the FUNcube Data Warehouse. Please remember that the uplink frequency varies with on board temperatures. A lower temperature means a higher frequency!

EO88 – Nayif-1. EO88 continues to perform nominally and is switching between high power telemetry for educational outreach when in sunlight and to its U/V transponder mode when in eclipse. It will soon celebrate its 5th birthday in space after launch on 15th February 2017.

JO97 – JY1Sat. JO97 suddenly stopped transmitting telemetry data on May 1st last year. The cause of this anomaly is unknown but fortunately the U/V transponder continues to operate continuously.

Battery voltage and incoming solar current over time - daily average

Battery voltage and incoming solar current over time – daily average

Nayif-1 Status Report and New Dashboard

UAE Nayif-1 CubeSatThe Nayif-1 (EO-88) CubeSat has now been in orbit for more than two weeks and all systems continue to operate nominally.

The power budget is positive, the spin/tumble rate is acceptably low, on board temperatures are perfectly okay and, importantly, the educational/amateur transponder switching is taking place autonomously as  planned.

More than 250 stations around the world have provided telemetry to the Nayif Data Warehouse and the FUNcube Team are extremely grateful to them for their invaluable support.

The experts have now formally allocated Catalog Number 42017 to Nayif-1 (EO88) and the TLEs can now be downloaded from Celestrak – TLEs

New Dashboards

The FUNcube Team have now updated the Dashboards for both Nayif-1 and FUNcube-1 so that they display only the telemetry received from the individual spacecraft that they are designed for. This will help users to display only the correct information and graphs and reduce confusion. Whilst they only display the data from ONE spacecraft, they will, as now, receive and decode the data from all FUNcube payloads currently in orbit and automatically submit it to the relevant Data Warehouse.

The new Dashboard for FUNcube-1 (ver 1044) can be downloaded from here: FUNcube Dashboard Installer 1044

The new Dashboard for Nayif-1 (ver 1040) can be downloaded from here: Nayif-1 Dashboard Installer 1040

Additionally some command line parameters have been added to enable the programmes to auto-start with the desired parameters.  These are:


Some notes on how to implement these parameters can be found here: funcube-dashboard-autostart

Nayif-1 Data Warehouse

Ham radio satellite transmits Vice President’s message

Nayif-1 Launched