The space probe has passed within 1,000 kilometers of the comet and is
maneuvering to match velocity. The space probe took an amazing photo.
(Ugliest looking comet that I have ever seen!)
The space probe will send a lander to the comet's surface. (Next year,
Unfortunately, the European Space Agency is not as open with their data
as the American space agency is. They let their people study the photos
first before they release them to the public.
As a follow-up to this thread, I would like to thank all who replied to my questions
and helped me along the way. By following the instructions given, I now have both Icom’s running together with
SatPC32…..how sweet !!!! Sure beats using the ‘ol overlay plotter…wasn’t it an Oscarlator ?
Thanks again and it’s time to finish my Satellite station with some antennas (cp)
and get on the air ;0) I’ve already completed the WRAPS-II az/el rotator system.
It doesn't violate any laws of physics if you are expending power from
photovoltaics to propel your spacecraft.
For example, you could push against the Earth's magnetic field to get a
satellite into a higher orbit.
This article seems to confirm this model, although they don't know what
they are pushing against:
I agree that this is probably nonsense, but maybe it isn't.
I have one of the Original AMSAT Broadband Satellite RX Preamps which has quit functioning. I have checked most of the components and everything looks normal except there is a large loss of signal instead gain. I suspect the Mini-Circuits MAR-07 has failed. Both Mouser and Digikey list the part as discontinued and zero stock.
Is there a source for quantity 1-2 each of the part, or does the AMSAT group that builds it have the part available?
Or is a substitute available?
a question to the FUNcube-2 experts: are the transmitted data of the
FUNcube-2 correct? In one of the last orbits I notice a raising of the
PA reverse power in the dashboard software (248 mW forward, 453 mW
reverse). Also in the Data Collection section Antenna Bus 1 and EPS for
example said failed.
Compared to the FUNcube-1 the signal strength of the FUNcube-2 beacon is
AMSAT has set up a campaign page with FundRazr to help launch Fox-1C next year. In order to maximize our success in raising the required funds, please visit the following link and use the buttons to share the campaign with your friends and contacts on social media and via email. The more it is shared, the more people will see it, and the more support we will receive.
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73, Drew KO4MA
@AMSAT <https://twitter.com/AMSAT/> if someone is interested in DL90 I can
activate it in coming days,not in my plans but I can work for many. SKED.
Sent for Iphone
David Maciel XE3DX
In the July/August 2014 issue of "Potentials" (which is the magazine for
student members of IEEE), three professors from the University of Hawaii
present a general overview of CubeSats.
The authors then describe their and their students' designs (and success)
in building a CubeSat designated H2 (Hooponopono) to replace the RADCAL
satellite (used for radar calibration) which ceased communication in May
2013, 17 years after its predicted life time of three years.
Among other things, I find it interesting that the team members are using
Ham Radio Deluxe and a Yaesu GS-232 rotor controller for tracking at their
ground station. The ELaNA program also gets a prominent mention. The
satellite transmits and receives on 437.22 Mhz, so the frequency
coordination and licensing were handled through the IARU and FCC.
At 03:54 PM 8/4/2014, Robert McGwier wrote:
>I hope they aren't wrong because they clearly don't understand how it
The result is surely wrong.
When measuring MICROnewtons, from a device that's going to be getting
very hot (because the microwave energy is dissipated in the walls of
the cavity) you may need to do the experiment in a vacuum, to avoid
air convection confusing the experiment. In any case, they say they
worked on the experiment for 8 days, which is not enough time to
figure out all the engineering aspects of the experiment.
They did the test in a vacuum chamber (which means they must have
been thinking along the lines of my statement above about convection,
but they did the test with "the door closed but at ambient
atmospheric pressure". Maybe they didn't have enough time to do the
tests at vacuum.
If they have resources to do more work, clearly pulling a vacuum on
that chamber is the next thing to do. I predict that the thrust will
disappear as the air is pumped out of the chamber.
However, of course I'm not absolutely sure its wrong. I'll be very
happy if it turns out to be correct.
My bet, however, is firmly on the no side.