[amsat-bb] EO-79 transponder ACTIVE

Paul Stoetzer n8hm at arrl.net
Fri Mar 25 14:53:59 UTC 2016

Lots of ditters, but only heard and worked WB8RJY on the 1437Z pass
over eastern North America. Lots of QSB, but strong signals otherwise
on the 15 degree pass.

I'll be on the next pass at 1612Z as well.


Paul, N8HM

On Fri, Mar 25, 2016 at 6:14 AM, Wouter Weggelaar <wouterweg at gmail.com> wrote:
> 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.
> TLEs:
> AMSAT keps name: EO-79
> Celestrak keps Name: QB50P1
> Celestrak file: cubesat.txt
> NORAD #    40025
> COSPAR designator    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 145.815MHz 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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