[amsat-bb] EO-79 transponder ACTIVE

Wouter Weggelaar wouterweg at gmail.com
Fri Mar 25 10:14:14 UTC 2016

Hi All,

Today, 25th of March 2016, the EO-79 transponder has been 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.

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

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 145.815MHz 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

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