Technical papers are solicited for presentation at the 26th Annual ARRL
and TAPR Digital Communications Conference to be held September 28-30,
2007 in Hartford, Connecticut. These papers will also be published in
the Conference Proceedings (you do NOT need to attend the conference to
have your paper included in the Proceedings). The submission deadline is
July 31, 2007. Please send papers to:
225 Main St
Newington, CT 06111
or you can make your submission via e-mail to: maty(a)arrl.org
Papers will be published exactly as submitted and authors will retain
73 . . . Steve, WB8IMY
I have both a commercial and a homebrew Eggbeater and am disappointed with both, especially in light of its rather high price. Connected to my IC-7000 via an ARR mast-mounted preamp, performance is far less than with an HT and an Arrow. Guess an omni can't cut it, at least not from my QTH.
Maybe if I could get it up higher, clear of all roofs, it would do better. I can make contacts at relatively high sat elevations, but can do just as well with a $10 dual band ground plane. My friend has an Eggbeater and the same preamp at a clearer QTH, and he hears substantially better, down to 10 degrees elevation in some directions.
Good luck and 73,
> > Hi Steve,
> > It is surprising to read that you are not hearing
> anything. I have
> > repeatedly used a 2m and 70cm Eggbeater for the sats
> and have had no
> > problem hearing things. No pre-amp.
> > I was using a short cable (e.g. less than 10 meters).
> The rigs I
> > used were a FT-736r (deaf) and a FT-847 (so-so).
> > 73,
> > Dave
We have met the enemy and they are us. WE need to do something. Yes, $15m is
outta reach, but isn't there a cash prize for the first on-commercial moon
DM78qd // KA0SWT
If it weren't for Philo T. Farnsworth, inventor of television, we'd still be
eating frozen radio dinners.-- Johnny Carson
From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On
Behalf Of Jeff Davis
Sent: Thursday, July 02, 2009 9:35 AM
Subject: [amsat-bb] Re: The Moon is our Future
On Thu, Jul 02, 2009 at 06:48:51AM -0600, Jack K. wrote:
> communications anyway) and move forward... We can put up all the leos
> we want, but until someone makes something like B. Bruninga's cell
> concept work, we are only going to have more of the same, We don't
> need more of the same!
I couldn't agree more - we don't need more of the same.
If I want to sit back and have a two hour rag-chew with someone on the other
side of the planet I will use Skype or my cell phone!
Dreaming about what *might* be in space is a fun exercise. Actually doing
something about it requires sending things to LEO because reality has
dictated that's as far as we can afford to go.
How's about we use some of that frustrated *imagineering* to come up with
interesting new concepts at LEO? We don't need any more FM repeaters buzzing
overhead, but what about more cameras downloading HD images, scientific
payloads that monitor the ongoing climate change, payloads to study the
Earth's magnetic field, etc. etc. Our own 'Twitter' messaging network from
The Apollo 13 creed of "failure is not an option" has completely infected
the brains at AMSAT and this list. You want something at HEO or on the moon,
cut a check for $15 million dollars and let's get on with it. Been waiting
since 1996 for another AO-13 and I am getting too old to keep waiting.
AMSAT is becoming completely irrelevant as it strives without success for
the impossible mission and exhibits a shocking amount of leadership
malfesance as it stubbornly refuses to recognize and adapt to realities in
the launch business.
I know, I know maybe NEXT year someone rich will die and leave us a boatload
of cash. Or the bankrupt US government will suddenly cough up a billion
dollars for some orbiting emergency communication system. In the meantime we
have to stifle the truth because it might blow yet another *secret* deal
that's in the works and *almost* a done deal, so let's not complain publicly
and ruin it.
Heard the stories, heard the lies, got all the t-shirts and ball caps.
AMSAT-NA member since 1994,
Skeptic that we will ever go back to HEO since 2002
Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
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But the ability to crossband repeat doesn't automatically mean that a radio can monitor a satellite's downlink while transmitting to it ....
From: "Andrew Glasbrenner" <glasbrenner(a)mindspring.com>
Subj: Re: [amsat-bb] Re: true duplex radios
Date: Mon Jun 1, 2009 12:55 pm
Size: 467 bytes
To: "Clint Bradford" <clintbrad4d(a)earthlink.net>,<amsat-bb(a)amsat.org>
> Really? Dual-receive, indeed. And will perform crossband repeating.
> But I can transmit on one band and simultaneously hear myself on
> another with a FT-8800?
How else would it be able to cross band repeat? Page three of the manual:
"Featuring 1054 memory channels (527 channels each for "Main" and "Sub"
duplex operation with independent Volume and Squelch controls, and built-in
DCS encoder/decoder circuits, ..."
73, Drew KO4MA
After a nearly 2 month wait, my rig came in recently. The good news is that
they are coming through with the current firmware and manual. The manual is
"OK" but lacks an index making things hard to find, and does not include all
the menu items. Fortunately, after you get comfortable with the logic, it
is easy to figure them out. The computer programming software is available
so far only in Japanese, but they claim the English version will be
available Real Soon Now. For normal operations, the RX and TX audio are
excellent, and the wideband receive is useful, or at least fun. As with
most HTs, the stock antenna could stand to be replaced, and has been.
Packet works well, and the VOX simplifies interfacing.
On the downside, the receivers are both less sensitive than they should be.
In comparison with an ancient Icom HT with exactly the same specs, using the
same antenna and location, marginal repeaters which are close to full
quieting on the Icom are noisy and largely unreadable on the Alinco. More
importantly for satellite use, the sub band which you must use for RX is
significantly noisier. I use an ARR preamp. With it on, pointing to clear
sky with an Elk antenna, I get 2-3 S-units of noise on the main RX. Using
the sub RX, it is full scale, and actual readability is poor in comparison
with the main RX. This is independent of whether the wideband RX function
is on or off. Attenuators off of course. ;)
I have had the impression that some of the old AMSAT hands at portable
operation have been less than impressed, and so far that has been my
experience. It will be interesting so see if there are any helpful firmware
updates. While a disappointment so far for satellite use, I do expect to
use this as my main HT for normal operations once the English programming
software becomes available.
Anybody have an experiences to share, hopefully positive?
The University of Texas at Austin deployed BEVO1 in space on July 30, 2009
at 7:27 AM CDT via the STS-127 Space Shuttle Picosatellite Launcher (SSPL).
We appreciate anyone who can help us tracking BEVO1!
BEVO1 Downlink Information:
Downlink Freq: 437.325 MHz
Modulation: FM, 200mW, Morse Code, ~20 WPM
Downlink Freq: 437.325 MHz
GMSK, 1W, 9600 baud, AX.25 (default)
FM, 1W, Bell 202, AX.25
1 99999U 9211.52399245 .00015326 99081-9 77971-4 0 19
2 99999 51.6397 84.3142 0004954 91.3966 248.8994 15.80682654 2322
BEVO1 is a 12.5 cm cube and 3 kg in mass. The purpose of the mission is to
collect data from NASA's DRAGON GPS receiver.
BEVO1 has two modes, data and beacon. The data mode is on over most parts of
the United States, and the rest of the time, the satellite is in beacon
mode. Also, anyone tracking BEVO1 can record what they hear at
http://paradigm.ae.utexas.edu/opsThe University of Texas also has additional
information at: http://www.utexas.edu/news/2009/06/09/picosatellite/
NASA describes DRAGONSat as an anticipated eight-year program with a launch
of the satellites approximately every two years. The first three missions
will test individual components and subsystems while the final mission will
culminate with the successful docking of two satellites. Refer to
http://tinyurl.com/m2blyc for additional mission information.
The University of Texas at Austin has developed BEVO1 and Texas
A&M University has developed AggieSat-2 for this mission. Both satellites
will perform the initial data acquition testing of the DRAGONSat program.
The two ANDE satellites (Castor and Pollux) will be deployed
from the Space Shuttle now that it has separated from the ISS.
Both satellites will be transmitting on 145.825 MHz. Castor will
transmit telemetry every 30 seconds. Pollux every 33 seconds.
Both are transmitting 1200 baud AX.25 packet Telemetry.
Most of the info is on the website:
Other than that, I don't have much detail information since this
was built by a different team than our original ANDE project.
The amateur payloads were developed by the Amateur Radio Club at
the Naval Research Labs and got a ride on the ANDE spheres like
we did a few years ago.
Does anyone know if these sats are sending FX.25 yet? I havnt found much on the
web about FX.25, but it sounds exptremely cool.
The https://goby.nrl.navy.mil/ANDE/Amateur_Radio.html web site refers to a FX.25
decoder. Is this yet available, I wonder?