AMSAT-UK

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FUNcube transponder on EO-79 active

Posted: 25 Mar 2016 06:12 AM PDT
http://amsat-uk.org/2016/03/25/eo-79...e-transponder/

EO-79 and EO-80 Image Credit ISIS

On March 25, 2016, the EO-79 SB/CW transponder was activated and will be
available 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 #Â*Â*Â* 40025

COSPAR designatorÂ*Â*Â* 2014-033-R

Frequencies:

Uplink: 435.035-435.065 MHz LSB

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 page at http://isispace.nl/HAM/qb50p.html

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

Lastly, the commanding team availability will be limited over Easter, so
please report the transponder being on or off on the status page of AMSAT:
http://www.amsat.org/status/

It does not appear in the table, but it does in the reporting drop-down.

73 and have FUN

Wouter Weggelaar, PA3WEG

AMSAT-NL

AMSAT-UK

2013 QB50 Precursor CubeSat announcement

http://amsat-uk.org/2013/07/20/qb50-...o-launch-2014/