is possible.
- Howie, AB2S
From: g.shirvi...@btinternet.com
To: n...@arrl.net
Date: Wed, 2 Jul 2014 12:19:35 +0100
CC: amsat-bb@amsat.org
Subject: Re: [amsat-bb] GTO opportunity
Many thanks Paul, I will have a good look at it!
73
Graham
-Original Message-
From: Paul
... and read it literally. The wording is such that an English major would see
it as
describing an incomplete, not-thoroughly tested project was being discussed.
Good thing there are more engineering majors than English majors on the list :)
- Howie AB2S
The MO-76 $50sat team is pleased to announce that $50sat was chosen as Project
of the Month by Rev-Ed, the makers of the PICAXE processor used in MO-76.
http://www.picaxe.com/Project-Gallery/50SAT/
Howie AB2S
The Fermi Paradox asks, if there are other intelligent civilizations in the
galaxy, why have they not come to visit us?
...They must have intercepted satellite transmissions of C-SPAN and concluded
there is no intelligent life on earth.
- Howie AB2S
If you are phasing the two antennas to get 3db of gain with the same
polarization, then the two cables can be any length as long as they are exactly
the same electrical length. It's a good practice to make two cables from the
same batch of coax if possible.
- Howie
in most cases.
- Howie
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the burst timing and frequency
offset need to be tracked.
This is a useful performance metric when troubleshooting connectivity issues in
a big network.
- Howie AB2S
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All Inmarsat satellites though the F-3 series have been in inclined orbits
since beginning of life. This gives them extended on orbit lifetime. The
beamwidth of the Inmarsat L band ground terminals is large enough that tracking
isn't required. The gateway stations operate at C band with large
a Certificate of
Technical Achievement to anyone that can confirm the two way QSO with the
satellite. Hey, it's the best three guys working from their hamshacks can do in
a 2 x 2 x 3 satellite.at least until next time :)
Howie AB2S
, not revolutionary and the only bad idea is the one you don't
consider...
Howie AB2S
Date: Tue, 18 Mar 2014 12:43:19 -0500
Subject: Re: [amsat-bb] $50sat MO-76
From: kayakfis...@gmail.com
To: howied...@hotmail.com
CC: amsat-bb@amsat.org
Howie,
I think $50SAT MO-76 is innovative and COOL. I also
provided by Inmarsat for
different classes of planes. I haven't seen the report you mention so I can't
make any guesses how this relates to the footprints.
- Howie AB2S
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you can build it and get it
launched does not mean it is legal. We all have a responsibility to
be vigilant. I don't think too many people would intentionally put up
a satellite in violation of the rule of law, but it is a complex issue.
It never hurts to ask a question.
- Howie AB2S
the option of sharing with
the amateur community or not.
- Howie AB2S
Date: Tue, 11 Mar 2014 22:14:33 +
From: m5...@yahoo.co.uk
Subject: Re: [amsat-bb] Re: Two hundred 437 MHz satallites launch March 16 +
WebSDR
To: howied...@hotmail.com; amsat-bb@amsat.org
This may be true if the owner
, the rules need to be flexible enough to accommodate
innovation.
Of course, these are just the opinions of one person. I am sure there are as
many opinions as there are subscribers to this list :) And yes, politics can be
a great attenuator to progress...
Howie, AB2S
Date: Sun, 9 Mar 2014 11
in my opinion.
Howie
AB2S
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...@hotmail.com
CC: amsat-bb@amsat.org
70 CM is not just for the ham bands, it is a shared band check the ruleswa4hfn
Damon
On Tue, Mar 4, 2014 at 2:30 PM, Howie DeFelice howied...@hotmail.com wrote:
Is CDMA an authorized emission type for the Amateur service? What is the
chipping rate/bandwidth
Yes Nitin, that is the one. The RFM22B datasheet will also be useful.
- Howie AB2S
Date: Fri, 21 Feb 2014 16:25:59 +0800
From: vu3...@yahoo.co.in
Subject: Re: [amsat-bb] $50sat
To: howied...@hotmail.com; amsat-bb@amsat.org
Howie,
Which is the document in the drop box location which has
The $50sat team is celebrating 90 days in orbit by proposing a technical
challenge to all interested amateurs. $50sat is capable of responding to uplink
command packets:
There are 3 open packets: Test packet - $50SAT responds by sending the RSSI of
the received packet in slow FM Morse.
is a little over 155
dB. Assuming a zero gain antenna on the typical WiFi client radio, the required
EIRP from the cubesat is in the neighborhood of 4KW. I don't think we are
quite there yet with current solar cell technology not to mention the
difficulty keeping the PA cool :)
- Howie AB2S
was transmitted along with the
carrier tone and the difference in frequency was detected to decode the digit.
This compensated for small frequency variations. These worked very well. You
could probably do a similar thing with a single row or column of DTMF if you
didn't need more than 4 digits.
Howie AB2S
Thanks Trevor,
Hope their data format includes a lng preamble to help acquire data. The
doppler is going to horrific..
Howie AB2S
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.
Thanks,
Howie AB2S
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Thanks for that explanation Bob. The members of the Eagle-2 ($50sat) team were
having this discussion last night and none of us knew the answer. Now we do !
We were trying to determine when using the UNISAT-5 keps would no longer be
valid for $50sat.
- Howie AB2S
clock using a form
of phase lock loop. As long as the PLL can acquire and track the downlink clock
information, the signal will stay locked and track the doppler change.
- Howie AB2S
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for educational access to space. There are
many ways to possibly make a platform this size into a usable communications
medium, but FM voice is definitely not one of them, and SSB would be very weak
signal at best.
- Howie, AB2S
transceivers have been used on aircraft for
many years now, extending the application to LEO should not be that much of a
regulatory stretch.
Howie AB2S
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that had less mass than a yagi, these are
really only practical at frequencies higher than UHF considering the gain to
patch area ratio.
Howie AB2S
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My experience with pendulum elevation was the same as Greg's. The hysteresis
made it unworkable. No matter how much I increased the weight or pendulum
length I could not get acceptable results. I shelved the project for the time
being.
- Howie AB2S
and they work pretty
good. The development board is $210.00.
- Howie AB2S
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. I
read about this in the current issue of ViaSatellite magazine, a publication
geared to the commercial satellite industry. You can read the article in their
online version of the magazine at:
http://accessintelligence.imirus.com/Mpowered/book/vvs12/i10/p1
- Howie AB2S
numerous QSO's on a single frequency sometime in the not so distant future.
- Howie
AB2S
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station. The current major
GEO operators have an average of 80% capacity utilization. The going price for
GEO capacity is in the range of $5,000 to $10,000 per Mhz. per month!
.
-Howie AB2S
From: domenico.i8...@tin.it
To: howied...@hotmail.com; w7...@comcast.net
CC: amsat-bb@amsat.org
operators are done
squeezing every last penny out of them, there isn't much left over to use
anyway :)
- Howie AB2S
Date: Fri, 15 Jun 2012 21:18:46 +
From: w7...@comcast.net
To: howied...@hotmail.com
CC: amsat-bb@amsat.org; tomdoyle1...@gmail.com
Subject: Re: [amsat-bb] perfect groundtrack contest
donating a few
Khz to AMSAT. We could then tie a single, commercially licensed uplink station
via echolink and hear it on the 9cm downlink. At least it would be a reason for
people to use the 9cm band before it's taken away for the latest mobile
broadband gizmo.
Howie AB2S
. But then again, this is the
same FCC that insists BPL isn't a problem. I think the FCC did a much better
job before they had computers, and became used spectrum salesmen :)
Just my opinion...
Howie AB2S
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USC has delivered their Aeneas 3U cubesat for launch preparations later this
year. Pretty amazing what they did with a 3U cubesat.
http://www.isi.edu/projects/serc/aeneas
HowieAB2S
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I read the description of the satellite a little more carefully this time and
noticed it is being built on a standard NRO cubesat bus. Very interesting
that an organization like NRO is utilizing cubesats. This also probably means
they are not using amateur spectrum for this one.
:) Howie- AB2S
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into the right size package now we need to sell the product. We
all need to become sales people and try to find the leads that could be our
next launch opportunity. Of course this is just my opinion, y!
ou may have a different one :)
._. _ . Howie, AB2S
I had several email exchanges with Zac earlier in the year when the call went
out for Amateur involvement. I was trying to get enough information to attempt
to put together a hardware decoder for the spread spectrum signal. The Cornell
team seemed only interested in having hams send in
. The
DSP between the ears can work pretty good at separating signals sometimes. Not
a good mode for handheld operation but may be worth a try just to see how well
it works..
Howie AB2S
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A similar report showed up recently on the Satellite Today report:
[Satellite TODAY 12-29-10] Turkey plans to send 3USAT, the nation’s first
homemade communications test satellite, into orbit in September, satellite
communications operatorTurksat announced Dec. 28.
The satellite, under
the two
antennas. I can definitely recommend this as a feasible project.
Howie
AB2S
_
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and better than the
early dithered commercial GPS service.
Howie
AB2S
_
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Hi Jonas,
If you have something capable of generating 422.967 MHz you should be able to
easily use the third harmonic. Remember that the original frequency shift at
422 is also tripled, so reduce the shift on the original signal accordingly.
Howie
AB2S
direction of the signal.
Howie
AB2S
_
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Howie
AB2S
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an antenna. Even if it took another year to make happen,
wouldn't it be worth it?
Howie AB2S
_
Get back to school stuff for them and cashback for you.
http://www.bing.com/cashback?form=MSHYCBpubl=WLHMTAGcrea
I agree, the ITAR rules are outrageous and have done more harm than good to the
U.S.. I received the following from a Satellite Today newsletter. It doesn't
specifically talk about ITAR but indicates there may be a glimmer of hope when
dealing with launches through ISRO...Howie AB2S
good, but would probably be better even at the lower microwave
freqs. If we used PSK31 exlusively, even 2.5 KHz many simultaneous QSO's.
Howie AB2S
_
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. In areas where it is allocated, the frequencies below 3.410 don't
seem to be popular commercially.
Howie AB2S
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for
Hughes. The pointing output supplied a DC voltage proportional to signal
strength. This unit will require allot of surgery to be useful 10 Ghz.
...de Howie AB2S
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