Students at the Ivy League Brown University are developing an amateur radio satellite EQUiSat that will carry a Xenon Flash Tube (XFT) subsystem to act as an Optical Beacon that should be visible to the unaided eye of observers on Earth.
73 Trevor M5AKA
Has anyone located a driver for the LVB Tracker internal USB to serial
port adapter on Windows 7 x64?
If not, has anyone reverted to the serial port connection on LVB Tracker
and used an external USB to serial port adapter successfully with
SatPC32 on Windows 7 x64?
I have an Edgeport multiple USB to serial port that has drivers for
Windows 7 x64 that I will use if I have to. I would prefer using the LVB
Tracker with its USB to serial adapter if someone has another solution.
Here is a quick AO-16 update. On Sunday I turned AO-16 long enough to
get some telemetry packets. The satellite would remain on for less
than one minute after being commanded on. A quick test of the "bent
pipe" voice mode repeater was successful. . The "hardware watchdog
timer problem" is still evident; as expected, spacecraft temperatures
are insufficient to keep the transmitter ON (needs to be above 15 deg
Orbit projections suggest that satellite illumination conditions will
not result in increased temperatures for nearly 10 years. Command
stations do periodically turn AO-16 "ON" to check on its condition and
see if the hardware timer problem has "automagically" fixed itself
(which in not anticipated, but who knows...).
3 Oct 2010 1838 utc
PACSAT MBL Telemetry Decoder Ver. 1.3 (c) Mike Rupprecht, DK3WN
+10V Battery Bus : 0.00 V
Battery Charge Reg : 0.55 mA
Base Temp : 9.07 °C
PSK RF Out : 1.90 W
+5V RX Bus : 4.87 V
+8.5V RX Bus : 8.49 V
+10V RX Bus : 11.24 V
Here is another teaser :) Several months ago I commanded the AO-16
S-band transmitter ON; it too remains functional (albeit weak), and
was received by me, Drew KO4MA, and Alan WA4SCA.
Mark L. Hammond [N8MH]
In addition: Good reception of sat carriers (+/- 2320.190 MHz)
with AIDC3733 2400>144 converter (was modified for AO40 rx):
receiver set at +/- 64.190 MHz (instead of 144.190)
73 de Michel F6HTJ
Hello all; for information here in south west Europe we use 2320,100 to
2320,300 cw/ssb portion of 13cm band for tropospheric , AS , RS, traffic.
I have been told by Piero I5CTE
there is permanent continuous carrier beacon around 2320.190 MHz (+/-
doppler) by 1 of the 3 Sirius elliptic NA satellites.
It appears reception is very good here with small 20 turn helix
antenna (in spite of 12m heliax coax) peaking 539.
Apogee (50000km ) around 325deg with 27deg elevation.
F5BOF reports same signal with small hand held 25 elements f9ft yagi.
So these are for us very interesting beacons. Depending hours we can receive 1 o 2 sats.
Real time positions (Sirius-1 / Sirius-2 / Sirius-3) here:
Any info about beacon sat polarisation and eirp ?
73 de Michel F6HTJ
One thing that would seem to be a concern to me is how to keep the attitude
steady while the ion engine is firing. Yes, not much thrust, but to make
the most of it, you want it pointing in as close to the ideal direction as
possible. I don't know how the various probes like Hayabusa and Dawn do
it.. Cold gas? Gyro? I would not think a bar magnet would be good enough
(certainly not for deep space probes, but even for earth orbit). Starting
to get more complicated.
Another thought about the really cool energy analysis done by KK6MC:
Besides the duty cycle imposed by wanting to be out of eclipse, there is
another duty cycle imposed by the starting orbit and the desired
eccentricity. For example if you were starting from a highly elliptical
GTO and you want to get to high circular, you need to thrust mainly at the
apogee in order to raise the perigee. If you are circular and you want to
be elliptical with perigee equal to the starting height, you thrust at what
will be the perigee to raise the apogee. (Of course you probably want to
raise both ends some, and you may want to change the plane too but that's
the general idea.)
Thanks for bringing this up...great thought experiments, and that's how
real projects begin!
I am a senior studying Electrical Engineering at the Rochester
Institute of Technology (RIT) and I am a member of a senior design group
that was sponsored by AMSAT to produce an engineering prototype *Maximum
Power Point Tracker* (MPPT) for the Fox-2 satellite. Most members of our
team are licensed radio amateurs and active members of the RIT Amateur
Radio Club K2GXT and have had quite the experience with this project! We've
worked extremely hard over the past 20 weeks to design and build a working
MPPT. We'd enjoy sharing this experience with anyone interested.
* Everyone who is in the Rochester, NY area or are willing to drive to
the area is invited to come to the RIT campus this Saturday May 4th
for the Imagine
RIT Innovation & Creativity Festival <http://www.rit.edu/imagine/>. This is
a completely free event on the RIT campus*.The previous link will have all
the information to get here and find exhibits of interest. Also,
here's a pretty
concise video <https://www.youtube.com/watch?v=fsQoh-_xOmY> on what the
event is about. The AMSAT Maximum Power Point Project is exhibit
will be located in what is known as the "infinity quad" outside the
engineering building (There's a big Mobius strip in the middle). We're
pretty much in the center of outside activity which is very nice for
showing people our project.
- Google StreetView of the Infinity
- 2013 Imagine RIT Festival
will be between the orange GLE and red LBR, you'll see a star, mobius
strip, and question mark on the map where I am referring too, sorry if it's
Our project is part of the Kate Gleason College of Engineering senior
design program and we proposed this project as a group last Summer. Tony
Monteiro has been our "customer" for the project and has been great to work
with. You can find out more information on our P13271 RIT EDGE
wiki<http://edge.rit.edu/edge/P13271/public/Home>which is pretty
up-to-date pending a few updates (since PCB bring-up) but
largely a great resource for those interested for a more in-depth look into
our project. We have not completed our project but will be displaying the
working prototype MPPT during the festival and be more than happy to
explain/show it to anyone interested. There are some final tests and
reports that are left to finish before our project is complete.
Some links to high-interest items on our EDGE Server:
- 1 Page Project
- Project Poster<http://edge.rit.edu/edge/P13271/public/MSD_Poster/MSD_Poster_r1.pdf>
- MPPT Block
- MPPT Schematics<http://edge.rit.edu/edge/P13271/public/KiCad/MPPT/trunk/AMSAT_7W_MPPT_Schem…>(slightly
out of date, some final values will be updated soon, largely
- MSP430 firmware
Well, I think I've thoroughly linked to areas people might have
interest in. Feel free to poke around the project documentation and learn
more or ask questions. If you have any questions about Imagine RIT or
anything related to the festival please ask as well. I look forward to
potentially seeing some of you at the festival!
Project Manager P13271
IARU Region 1 has agreed an addition 2m allocation for the Amateur Satellite Service subject to IARU Regions 2 (the Americas) and 3 (Asia/Pacific) also agreeing it.
The IARU Region 2 Conference is in Cancun, Mexico in September 2013 hopefully satellite users in Region 2 will let their National Society know their views on this matter.
73 Trevor M5AKA
Will be in the country of Peru, active on FO-29 and AO-7 if at all
possible. Other sats by request.
Not sure when the first pass will be. Grid for Lima is FH17.
Will be going north in two weeks. Not sure which grid squares I'll be
activating. Will keep everyone appraised.
73 de Norm n3ykf