[amsat-bb] AO73 / FUNcube-1 Happy Holiday Mode

Graham Shirville g.shirville at btinternet.com
Thu Dec 21 18:46:53 UTC 2017


Hi All,

Just to report that AO73/FUNcube-1 is now operating in full time 
transponder mode and will continue in this mode until the evening of 
Wednesday  3rd January 2018.

Please enjoy the transponder during this happy holiday period!

Season's greetings from the whole FUNcube team.

73

Graham

G3VZV

General Info:

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.
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
Dec 2017 Update – As a result of on-board operational issues this 
transponder is NOT currently active.
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

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



More information about the AMSAT-BB mailing list