[amsat-bb] Subject: Was, Is there anyway to get a linear transponder on the ISS?
k5vou2 at verizon.net
Sun Jun 2 18:23:51 PDT 2013
Thanks for all the input regarding the FM 'repeater' on the ISS. Further
research into the issues has enlightened me on the machinations of
getting things done on the ISS and the complicated processes of working
with such varied national interests. It is obviously way above my pay
grade and with these comments I sadly end the quest with a feeling of
not going anywhere.
The Kenwood TM-D700 portion of the Phase 2 Hardware system is apparently
overheating. Possibly because of a lack of airflow over the heat
sinks. Possibly because when it is made available, the duty cycle rises
to near 100% and the unit consumes too much power from the ISS power
budget. Since the other parts of the Phase 2 system are fulfilling the
needs of the ISS and NASA agenda, there are no resources available to
correct the problems with the TM-D700. Indeed, replacing it with a
linear transponder of equal bandwidth and much reduced power consumption
may be a much better solution but there do not appear to be any benefits
to the ARISS program to drive the solution. There was a mention in the
paper produced circa 2002-3 of a third phase of the ARISS hardware
system to be mounted outside but no mention of such a program since then
has been located.
Should others want to pursue a program of getting a linear transponder
mounted on the outside of the ISS, I wish you luck and refer you to the
"Amateur Radio on the International Space Station - Phase 2 Hardware
System" by Frank H. Bauer, KA3HDO, Lou McFadin, W5DID, Bob Bruniga,
WB4APR, and Hiroto Watarikawa. Sergej Samburov, RV3DR was also listed
but this call sign now returns as belonging to Energia in Russia. The
document was found at http://www.ariss-eu.org/phase_2_document.pdf
on the internet. Frank is a new Amsat VP in this area, Bob is a
participant in this list and Lou is still around too I think. Maybe one
or all of them can help.
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