Hej,
Dagens nät på 3740 Khz klockan
10.00
Deltagare
SM6NZV
SM7FWZ
SM7WSJ
*Atlantis
nere på jorden igen
*Ovanligt
problem med Geostationär satellit (titta på videon i länken)
http://news.bbc.co.uk/2/hi/science_and_environment/10150614.stm
*X-51A
Waverider (inte direkt satellitrelaterat men fort går det,,)
http://news.yahoo.com/s/ap/20100527/ap_on_bi_ge/us_hypersonic_flight_2
*P3E
P5A (Kommit lite info från våra grannar i öst)
Hi all
Microwavers,
AMSAT-OH is working on the S/X band
coherent/linear
transponder for P3E. The Coherent mode is a
fully
functional testbed for the P5A ranging transponder.
Especially
the linear transponder prototype has been
assembled and verified with
over-the-air tests and
laboratory tests. Flight versions of the
submodules
have been and are being produced at this time with
our eyes now
set on integrating these together and
cabling the whole job
together.
Full verification of the Coherent Mode requires a
fully
functional command station AND a functional
IHU + CAN environment to
interface our data ports with.
No such tests have been available yet, but all
our
preliminary testing and evaluation of the Coherent
Processor have
shown proper operation of the design
and circuitry (e.g. locking onto a
“modulated” uplink
carrier, tracking this etc.). So far correct
live
operation of the Coherent Mode is our biggest questionmark.
Our
national team meets on a regular basis every 4 – 6 weeks
for testing and
followups of the work of each individual.
This transponder is especially
complex as you can
see from these key figures:
* 9 different local
oscillators
* All local oscillators locked to the common 10 MHz USO
* 21
different frequency mixers
* 13 different intermediate frequencies
*
Linear Mode output power on 10 GHz: 3 W PEP
* P5A Mode output power on 10
GHz: 1 mW PEP
* 38 control lines on the CAN interfaces
* 2 CAN interfaces,
one in multiplexed mode
* 4 dedicated direct control lines interfacing with
the IHU
* 14 analogue telemetry lines to the CAN bus
* Coherent Mode
Uplink/Downlink ratio is fixed at 30:7
Here you may find a general
outline webpage, though unfortunately in
Finnish for the benefit of our OH
supporters, but you might still enjoy
the photos and drawings:
http://www.rats.fi/rats/amsat-oh/
Our
team sincerely hopes funding will eventually be found
for P3E/P5A – this is
the only thing that keeps us motivated
to continue our work. On the other
hand we are clearly behind
schedule, so the delays are welcome 🙂 But then
again, any
news of progress would boost our production rate phenomenally
😉
73 Michael, OH2AUE
Ha en god vecka! 73 de Håkan SM7WSJ