[amsat-bb] EO-79 transponder ACTIVE

Paul Stoetzer n8hm at arrl.net
Fri Mar 25 15:08:17 UTC 2016

By the way, I'd transmit 10-12 kHz up from where you expect to be
based on Doppler calculations. I think I was around 12-15 kHz higher
than nominal.


Paul, N8HM

On Fri, Mar 25, 2016 at 10:53 AM, Paul Stoetzer <n8hm at arrl.net> wrote:
> 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.
> 73,
> 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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