Our server and network vendor will be doing planned maintenance on ...
July 27th, 2014, beginning at 2:00AM (EDT) ... [This] work will likely
lead to momentary interruptions in service. The maintenance window,
predicted to span from 2-4 hours, will ultimately improve network
stability and restore
On 6/18/2014 9:07 PM, Jim Sanford wrote:
Comcast is blocking a bunch of stuff as well.
The spammers are winning.
We are doing OK with garden variety spammers ... so far this week the
AMSAT mail server has blocked 97,257 spam e-mails.
It is the phishers variant of spammers in this
Web and mail were out of service for about and hour between 2014 JUN 18 20:10 UTC and
21:10 UTC due to network problems at our vendor's data center. As of this writing, I
have not received the all clear message, so there could be continuing
difficulties.
-Joe KM1P
*
with addresses such as u...@hotmail.com or
u...@outlook.com.
If you are having, or know of anyone having difficulties that might not
be receiving messages from AMSAT, please contact me off-list so we can
work toward a resolution.
jfitzgerald at alum.wpi.edu
-Joe Fitzgerald KM1P
Here are links to the ITAR rule changes as published in the Federal
Register:
I am surprised that only 38 organizations took the time and effort to
comment, but I am glad AMSAT is one of them. While we didn't get all we
asked for, I am glad we are participating in the process.
We have until
We are now in the early operational phase of amsat.org mail on a
commercial server. There was an early glitch which prevented
calls...@amsat.org mail aliases from flowing properly, but this is
believed to be fixed now. Mailing lists have been a bit more
problematic, but I am continuing to
Thanks for the note, Andre.
Unfortunately, the various options we have at our disposal to deal with
the new policies at Gmail, AOL and Yahoo are somewhat problematic.
See
http://wiki.list.org/display/DEV/DMARC
-Joe KM1P
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Thank you for reporting this, Jerry. As Alan said, we made a test to
determine that the redirection change I implemented a couple of days ago
would not affect SatPC32 users, but it was apparently not a thorough test.
I reverted the change, so you and other SatPC32 users will not be
On 4/29/2014 9:09 PM, Bryce Salmi wrote:
http://www.spacex.com/news/2014/04/29/first-stage-landing-video
First stage landing video is public!
When my daughter becomes an astronaut, I will be happy to watch her
ascend to orbit on a SpaceX rocket. When she gets married, however, I
will
Yes, Domenico, but AO-40 gets better in my memory with each passing year.
Perhaps that is why it _seems_ like some of the frames I hear from Funcube
should decode when they don't.
-Joe
Hi John, W0JAB
On AO40 you should remember mostly the fading due of
spin modulation..
Phil,
That is an interesting question. I have fooled with a simple 1/4 wave
vertical, and observe very bad fading with a period of 10's of seconds
(5 to 10 times longer than individual frames). It seems to my ear that
signals need to be pretty strong in order to decode on AMSAT-UK's
I notice that the frequency calculated by MacDoppler is slightly off from
the frequency that I hear the telemetry at.
AO-73's transmit frequency drifts around as the spacecraft warms and
cools. I remember being surprised to see the telemetry trace increase in
frequency on my waterfall
I cut the RFI Ferrite blobs off of all trash Keyboards and stuff. These
are great Ferrite devices.
But what are they best for?
Bob,
Check out this article from Chuck Councilman W1HIS:
http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf
He wrote it from the
On 3/26/2014 3:28 PM, Howie DeFelice wrote:
This was a very clever use of available data for an unintended purpose.
I am a little surprised that they retained enough data to do the doppler
analysis. For example, once I successfully download a
As to the question about retaining the data, you can think of it as
meta data similar to what the cellphone carriers collect about cellphone
calls. They don't record and save you conversations but they do record
information about origination, destination,time, duration and type of
call.
At 05:25 PM 3/24/2014 -0400, Anthony Japha tjja...@earthlink.net
wrote:
Great news! Thank you Peter et. al.
How abt a discussion here about how we North Americans might make use
of this opportunity?
73,
Tony, N2UN
LM 183
Well, there is a nice article in the Jan/Feb AMSAT Journal about
On 10/8/2013 5:38 PM, M5AKA wrote:
Beam headings are at
http://www.jpl.nasa.gov/hijuno/pdf/Juno_EFB_Waves_Ham_Radio_Headings_00.pdf
For the truly geeky, edit the text below for your location, and send to
JPL. Ephemeris should
be in your inbox in a minute or two.
-Joe KM1P
!$$SOF
On 9/27/2013 8:57 AM, Robert Bruninga wrote:
Why don’t we see simple ¼ wave 75 ohm lines used as a first step in
matching a 140 Ohm Helix to 50 ohms?
In my limited experience, it's easier to diddle around with a strip of
brass or copper at the feed end of the Helix..
For example:
On 9/27/2013 6:58 AM, Mike Seguin wrote:
Is this a permanent change? Maybe this was in response to the rebuild
post hack?
ww2 addresses are all temporary. For the last couple of weeks, keps
have been served from the future home server of www.amsat.org.
I have turned off the redirect
On 9/24/2013 10:45 AM, Robert Bruninga wrote:
Actually the impact concern is the AREA
Which leads to a surprising problem. Suppose a cubesat at the end of
it's mission deploys some sort of sail intended to increase atmospheric
drag and shorten time to re-entry. Good idea right? Maybe not,
On 9/4/2013 6:53 PM, tosca...@umn.edu wrote:
As long as AMSAT-NA needs to concentrate on 1U/3U/6U Cubesats for the
immediatee future, I would really like to see the pursuit of linear
transponders on them instead of single-channel FM repeaters. The way I
see it, launch opportunities are so rare
Gambling with a Space Fence:
http://www.thespacereview.com/article/2357/1
-Joe KM1P
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Thanks to the effort of a bunch of people , especially Brent Salmi,
Steve Kenwolf and Brent Salmi, we have pushed a new, more colorful theme
to the AMSAT web site, as well as some updated content. We are by no
means done, and welcome the assistance of others to generate content and
features
Thanks to some advice from Emileigh N1DID, detective work by Bryce KB1LQC
and Brent KB1LQD and a quick update to the site by Rick W2GPS, pass
predictions are working again.
Please visit:
http://www.amsat.org/amsat-new/tools/predict/index.php
-Joe KM1P
On 3/25/2013 6:42 PM, Ken Ernandes wrote:
2. If you decide to give the users the ability to input their location, them
the option to provide either a single minimum elevation angle or a local map --
i.e., 360 individual minimum elevations as a function of Azimuth. It's much
easier to
On 3/26/2013 2:34 PM, Joseph Armbruster wrote:
Joe,
What tracking program is that?
I am not sure what they call it, but I believe it is a custom NASA
program. It was used in the Shuttle mission control center, and they
often put it up on NASA TV when S band telemetry was available, but Ku
Bob, WB4aPR wrote:
I wonder if the billion to one chance that the transponder came on too?
If it did, the Brazilian CB'ers will know!
-Joe KM1P
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Not an AMSAT-NA member?
If you are getting your keps from SpaceTrack, you may see some changes
soon. The following is the latest from Vandenburg:
**
We are pleased to announce that we will upgrade the current
www.Space-Track.org on Wednesday, 20 February 2013 at 12:00 PST to add the
On 2/1/2013 7:17 PM, Clint Bradford wrote:
I am working on a publishing deadline. Confirming that AMSAT.org will
continue to be the domain name for AMSAT-NA's official site - is that correct?
Clint,
Use of amsat.org will continue indefinitely. It is difficult to
imagine a scenario where
On 1/4/2013 5:20 PM, Trevor . wrote:
The provision permits the Obama administration to remove satellites and related
equipment from the U.S. State Department's munitions list, which restricts the weapons
material from export to other countries.
Trevor,
Here is my view from the perspective
Mark,
Curiously ESA and NASA are doing similar work, although not with students:
http://www2.electronicproducts.com/Control_a_LEGO_robot_from_space-article-FANE_lego_robot_space_Nov2012-html.aspx
Joe KM1P
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On 8/6/2012 2:45 PM, Alan P. Biddle wrote:
An amazing picture of Curiosity and it's parachute during the descent phase:
The MRO HiRISE team is 2 for 2 ... they pulled off the same feat for
Phoenix back in 2008
http://hirise.lpl.arizona.edu/phoenix-descent.php
-Joe KM1P
Will these guys help us launch AMSAT Fox?
http://www.spacenews.com/civil/120726-san-quentin-prisoners-building-satellite-hardware-for-nasa.html
-Joe
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Not an AMSAT-NA member?
http://phys.org/news/2012-06-satellite-battery-nittany-lion-paw.html
-Joe KM1P
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Subscription
On 2/24/2012 8:14 PM, Phil Karn wrote:
Fortunately, the problem of
tracking a LEO satellite with a deadband of 5-10 degrees is a very
non-demanding problem. That's why most hams are still doing it with
primitive, bang-bang control.
I had occasion to install a Pro-sis-tel rotor for a nearby
On 2/25/2012 4:25 PM, Phil Karn wrote:
If it really was a 3-phase induction motor then there *had* to be some
sort of phase shift at least to start it.
Of course you are right. I found a schematic of their controller
http://www.ecse.rpi.edu/courses/CStudio/ham_radio_docs/Prosistel61C.pdf
On 2/23/2012 3:23 PM, Phil Karn wrote:
These variable frequency/variable voltage AC motor drives have long been
common in industry, and they've become the standard in hybrid and newer
electric cars.
Phil,
Your fans will not be completely happy until your controller runs a
state-space model
On 1/23/2012 2:52 PM, Andrew Glasbrenner wrote:
I forgot to tell you! Don't cross the streams
Thank you for the warning Dr Spengler!
-Joe KM1P
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On 12/25/2011 9:29 AM, Andy Brian wrote:
I need notebook for my antenna control and I'm looking how to
reduce or minimaze the noise from PSU, any good suggestion are welcome.
thanks
Ferrite is your friend. Mouser is a great source.
See
On 12/17/2011 9:54 PM, Bob Bruninga wrote:
The recent Balloon flight over the atlantic was a clear demonstration that
there is no APRS IGate on Bermuda leaving about 800,000 square miles of the
Atlantic without coverage.
I've never been there and I assume the old NASA station no longer exists
On 9/5/2011 6:47 PM, Richard Ferryman wrote:
Can anyone tell me the conditions that trigger this EMERGENCY mode and what
changes to operation take place in this mode.
Hi Dick!
Thanks for collecting and forwarding data from ARISSat-1.
Emergency mode is entered when the power management
On 8/7/2011 9:44 AM, Giulio P. AOL wrote:
what could be the critical height (closest to the earth) for the
satellite, where the temperatures will degrade the operation?
By the time we see significant heating, we only have 10's of hours left
in orbit. Take a look at the temperatures of
On 8/4/2011 11:04 PM, Sion Chow Q. C. (9W2QC) wrote:
Dear All,
It was great to receive ARISSsat-1 over West Malaysia during 5th
August 2011, 0223 UTC pass. Maximum elevation was 89 degrees.
Sion
It is always great to see your early reception reports on amsat-bb!
Keep up the good work.
Our friends at Microchip are stirring up some interest in our project
outside the ham radio world.
http://www.eetimes.com/electronics-blogs/chips-in-space/4218140/The-Building-of-an-Amateur-Satellite-1
-Joe KM1P
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On 6/23/2011 9:57 PM, Anthony Monteiro wrote:
We hope to have the server with the ARISSatTLM Windows
code up again soon.
The server is back on line. You can find the code at
https://svn.sarpeidon.net/suitsat2/repos/ground_station_software/ARISSatTLM/
-Joe KM1P
The ARISSat-1 project can chalk up many successes, here is my list so far:
AMSAT has:
Built and launched a spacecraft which has sent signals back to earth
Grown up significantly in our project management capabilities, now
bearing fruit as AMSAT-Fox is developed
Developed a telemetry scheme that
On 4/11/2011 1:44 PM, Phil Karn wrote:
Since it's already connected to the station antenna, it sure would be nice
if they could just plug it directly into the ISS power supply, switch it on
full duty cycle, and just *leave* it for a couple of, oh, years.
Phil,
I am curious to see how your
On 3/2/2011 12:13 AM, Clint Bradford wrote:
OK - I'll ask. Why is this satellite not named, AMSAT-Foxtrot?
The software guys, being mostly of the Unix persuasion lobbied for
something very terse like AMASAT-fo or AMSAT-fx.
There were a few Windows guys who wanted
ARISSat-1 is now in orbit, but still cocooned in the Progress cargo ship.
See launch pictures at:
http://forum.nasaspaceflight.com/index.php?topic=23441.0;all
Woo-hoo!
Joe KM1P
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With Progress launch picture.
http://spaceflightnow.com/station/exp26/110127prog41p/
-Joe KM1P
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On 11/19/2010 8:39 PM, Samudra Haque wrote:
Hey, I was able to show everybody a live launch, and I think it was a
flawless launch?
I keep hearing my favorite word ... nominal.
-Joe KM1P
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Is there any reason why a future Amatuer Radio Satellite could not
include a small telescope and CCD imaging.
In principal, no. In practice, how much are you willing to spend?
Perhaps the biggest problem that needs to be solved is how to get the
telescope pointed at the target you want. To
Yes, NEVER higher than 15 degrees. You don't need the gain much
above the horizon where the satellite is up to 10 dB CLOSER.
Bob,
Looks like you Navy guys have been using this technique since the early
1960's. Check out the photo Radio Control Hut Team Overseas on
Auke de Jong, VE6PWN wrote:
On second thought, the software that runs the fully-automated personal
telescopes already does most of this, except for the relative velocity part.
The US government will do that for us via the JPL HORIZONS tracking
system http://ssd.jpl.nasa.gov/?horizons
1. Keplerian elements are great for satellites, but once UNITEC1 enters
deep space,
what do we use to calculate and predict the path for our accurate tracking
?
It likely that this spacecraft will be tracked as part of the JPL HORIZONS
system as were other Japanese deep space objects like
Hello,
Given the recent close conjunction between Compass-1 and Sich 1,
I was curious how common such encounters were. Using
SOCRATES on the celestrak site, http://celestrak.com/SOCRATES/,
it looks like they are fairly common.
Take those forecasts with a grain of salt since they are
Idle-Tyme wrote:
It might be an Urban Legend But I always remember that those early
birds antennas were simply made from tape measure like materials.
That is pretty much state of the art, even now. Take a look at the
photos of PCSAT at http://wa8lmf.net/bruninga/pcsat.html
You can just
Joel I. Kandel wrote:
Is anyone using Nova for tracking celestials (e.g., Jupiter or Sun ) for
radio astronomy purposes? I have an LVB Tracker but not sure Nova is
compatible and SatPC32 doesn't track celestial bodies. Also not sure
LabJackU3 is completely supported by Nova yet.
Any
As a practical matter, I'd use the fishing weights tucked in as close to
the boom as possible to keep the additional wind load down. In fact if
the boom is hollow, you could stick the weights inside and not increase
the wind load at all. As long as the metallic counterbalance is not
actually
what's the preferred
order?
As ever that depends. In the specific case I was involved in at
Worcester Polytech, we found that we could get the best trade off by
putting the preamp at the antenna then knocking down the out of band stuff
with the filter between the preamp and the receiver.
Samudra,
I enjoyed your presentation and comments during the symposium, I
apologize that I did not have a chance to talk one on one. I'll take a
stab at some of your questions
But first a few questions:
Does cubesat employ all open standards, free for use, free of any
copyright -or-
Look to the Empire State near the Harvest Moon.
A gift may arrive near the ides of May.
Alex,
What are you talking about?
-Joe KM1P
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David - KG4ZLB wrote:
Does anyone know if NASA plans to broadcast footage from inside the
Shuttle, maybe a split screen showing the traditional launch and the
other side showing the crew during lift off?
I have seen split screens on NASA TV, usually a day or two after
launch. A
Check out Section C in
http://tmo.jpl.nasa.gov/progress_report/42-176/176D.pdf
-Joe KM1P
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Looks as though the deployment from the shuttle didn't go ahead. They've
been doing engine burns during the past minutes.
Looks like the deployment happens tomorrow about 17:22 UTC(Specifically
flight day 14 19:19:00 mission elapsed Time.) to allow for good radar
observations.
From today's
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