[amsat-bb] AO-73/FUNcube Mode switch

Jim Heck G3WGM jimlist at zoho.com
Thu Apr 20 19:20:24 UTC 2017


Hi Folks,

  This is to let you know that I have just switched AO-73/FUNcube into 
amateur mode, with transponder activated 24/7.
Early this week due to ground station availability.

As per normal, we will switch back to autonomous mode on Sunday pm UTC.

73s Jim G3WGM 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. Low
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-regular-operation/EO88
Nayif-1 FUNcube-5EO88 is presently operating in autonomous mode. The
transponder isoperational when the satellite is in eclipse, ie the solar
panels are NOTbeing 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 USBTelemetry  Tx:
145.940MHzAll FUNcube transponders are sponsored by AMSAT-UK and AMSAT-NL.
We are verygrateful for the assistance given by Innovative Solution In Space
Bv, TheNetherlands.

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