Pass #14375 per NOVA.
PIcked up tlm about elev=5 with 11-elem yagi with no preamp and
Doppler about +8 KHz. Not full copy but enough to demonstrate the sw
is working. I printed raw data on both MixW2 and tlmEcho, so I would
guess things are OK for looking for CAPE-1 tomorrow night (3/27 0801 utc).
Here's the MixW2 output:
PLCTL Mode:2 TXA:0 TXB:0 BatTrip:0
PHT: uptime is 037/13:39:30. Time is Mon Mar 26 02:21:57 2007
PACBLS S Meter = 0
Ed - KL7UW
BP40IQ 50-MHz - 10-GHz www.kl7uw.com
144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
DUBUS Magazine USA Rep dubususa(a)hotmail.com
I have upgraded my MixW2 (demo) to vers 2.18 and going over settings
to receive 9600 bps FM AX.25 telemetry from AO-51. I doing this in
hopes to get a good test before trying to receive CAPE-1 after launch March 27.
Long time ago I had it working with virtual connection with tlmEcho
program, but I am just wanting to recover raw telemetry for CAPE-1
since no decoding sw is available for CAPE-1 to my knowledge.
I tried capturing some on the last pass which was north of me, but I
had the wrong frequency for most of the pass. Still tuning near
435.150 toward the end of the pass I could not detect any signal
(quieting) from the 9600 packet signal. I know that 9600 does not
provide sound that is heard but I recall that it should provide some
quieting in the passband.
I wonder if anyone is using MixW2 with tlmEcho to recover AO-51
tlm? I sure would appreciate having someone check my sw settings for
MixW2. There is no local source of 9600 packet to use for
checkout. I am stumped why MixW2 comes up with a window stating my
demo period has expired as I just downloaded it yesterday (supposed
to get 15-day free demo period). Will this kill any chance of retrieving data?
Ed - KL7UW
BP40IQ 50-MHz - 10-GHz www.kl7uw.com
144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
DUBUS Magazine USA Rep dubususa(a)hotmail.com
Just a quick update from Cal Poly about the upcoming launch. Everything is going very well and we are very excited here. The launch is happening Monday night at 23:46 Pacific time / Tuesday morning at 02:46 Eastern time. There is a lot of information about frequencies, modes, keps, etc, on the main Cubesat webpage at www.cubesat.org
Due to the $8k cost of the private webcast last time, we are not doing it again. So, instead, we will be providing live updates on the Cubesat IRC channel. Point your favorite IRC client to #cubesat on irc.freenode.net We will also be providing a MP3 download of launch countdown audio stream a few hours after launch. All of this will be accessible on the CubeSat webpage.
We also have a data packet entry form where you can enter data packets you received (from any satellite) at your earth station. The form is at: http://cubesat.atl.calpoly.edu/pages/missions/dnepr-launch-2/data-packet-fo…
P-POD A (CP2.1, AeroCube2, CSTB1)
1 xxxxxU xxxxxxxx 07086.29310451 .00000000 00000-0 00000-0 0 0000x
2 xxxxx 098.0870 161.6633 0071000 198.4663 339.8290 14.5270000000001x
P-POD B (CP3, CAPE1, Libertad-1)
1 xxxxxU xxxxxxxx 07086.29312766 .00000000 00000-0 00000-0 0 0000x
2 xxxxx 098.0870 161.6633 0090000 199.4051 339.9000 14.5050000000001x
P-POD C (MAST triple-cube)
1 xxxxxU xxxxxxxx 07086.29311609 .00000000 00000-0 00000-0 0 0000x
2 xxxxx 098.0870 161.6633 0084000 198.3918 339.9240 14.5160000000001x
Any other questions, feel free to email me. Thanks!
Bryan Klofas, KF6ZEO
Cal Poly State University
Still building up my station but cash is starting to get tight!
I was considering the M2 436CP42 U/G and M2 2MCP22 antenna's.
I think I'm down to the build-it, instead of buy it stage, so I was
wondering if anyone has links
to websites with PROVEN designs for a CP beam such as these?
I have seen a few sites but I hate to build a CP antenna without prior
recommendations from someone else.
So, What have you? :-)
Station so far...
FT-847 (computer controlled)
G-5500 rotor (computer controlled)
LVB tracking board
Orbitron tracking software
ARR MSP432VDG-160 preamp
ARR MSP144VDG-160 preamp
A good friend will come and bail you out of jail,
A TRUE friend will be sitting next to you saying.....
"DAMN THAT WAS FUN"
The old vintage OZ7IGY (International Geographic
Year) beacon has been activated on approximately
They wanted to use another frequency, but had problems
so that they asked me if it was OK to use 145.988 MHz.
That is is nice frequency since OZ7IGY is retransmitted
by FO-29 in the low end of the downlink band. That end
is not used by anyone normally, so it should not be a
It will be for this week only.
It is not on all the time since it is very old valve (tube)equipment.
I think the plan is to use it most af the day during
the weekend - and 16 - 22 during working days.
The signal from FO-29 is really good when the elevation
angle from JO55 (Denmark) is low.
I could hear it from FO-29 at a distance of 4100 km from my QTH.
The beacon OZ7IGY is probably the oldest VHF beacon in
the World ?
Try to listen for it - this is a one time event !
Stations in Europe may want to have QSO with OZ7IGY, which
is manned this weekend and from 16 to 22 during the comming
I have heard it on 432.270 MHz. They use the beacon antennas
and 25 W only.
Have a nice weekend
with the discussion about the upcoming CubeSat launch in mind, and since
we have not been able to update our website regularly just a couple of
words from the Delfi-C3 office:) We are currently very busy integrating
the spacecraft. Although it's a 3-unit CubeSat, it's still very, very
small... so that gives some headaches sometimes:)
Delfi-C3 carries two redundant (primary and backup), and almost similar
radio transceivers, connected to the antenna system by a hybrid combiner
which also takes care of generating the correct phase relationship
between the antennas. Both transceivers consist of a UHF frontend, a
command receiver, linear IF, telemetry generator and the final stages
capable of 400mW RF power. Each transceiver is housed on a single 96 x
90mm board. Our tight power budget allows only one transmitter to be
active at all times.
Delfi-C3 contains no batteries, one of the reasons being the fact that
it's primary mission is to perform a solar cell and sun sensor
experiment which depend on the presence of sunlight. Therefore, the
spacecraft is only active when in sunlight. Of course, since there's no
such thing as a free lunch, this has made the design complicated on an
other level, especially software-wise. (proper boot-up sequences etc.)
The first three months of the mission are what we call the "science"
mission, in which the spacecraft will be transmitting 1200 bit/s AX.25
telemetry on either the primary or backup VHF downlink frequency,
frequency information can be found on our website http://www.delfic3.nl
Telemetry is contained in UI frames, with roughly one frame every
second. All detailed information regarding telemetry will be announced
on the website as well.
Modulation is Raised Cosine (in time) BPSK, more or less similar to that
of the Microsats. Therefore, owners of a PSK TNC such as the NB-96/PSK-1
combo can use them with the software (written in JAVA) that we will
supply (will be made available via our website). This software package
connects to the TNC in KISS mode, and allows you to display telemetry in
real time, and upload it to our central server in Delft. Since PSK TNC's
are not that common anymore in today's shacks, and PC's are, we are
developing a soundcard application in JAVA that can be used with the
telemetry decoding software. An other option is to use the popular mixw
program, which can demodulate BPSK and emulate a KISS TNC.
After three months, the linear transponder will be activated, with a
40kHz bandwidth. In transponder mode, a CW beacon will be active instead
of BPSK telemetry. This CW beacon is actually transmitted as double
sideband, with two carriers spaced 1200Hz apart. It will transmit a
message saying "hi hi de delfi-c3 delfi-c3". Beacon power is set at 10dB
below transponder PEP, users are requested to limit uplink power to the
necessary minimum to maintain a proper downlink, while not driving the
AGC excessively high. Since Delfi-C3 can indeed be considered a
"hardsat", with only 400mW of downlink power, it is wise to pay
attention to a good receive system. The transponder IF is very basic,
consisting of ceramic filter to set the bandwidth, an amplifier chain on
10.7MHz and a fast-attack / slow-decay AGC. You can listen to an audio
clip of the first transponder test QSO (in Dutch...) between PA3WEG (who
designed the local oscillators) and PE4WJ at
(Mind you, there is some QRM in the file that might sound a bit like
Leila, but this is pure coincidence)
With regard to the orbit, TLE's will be anounced on the website
(www.delfic3.nl) once they are available, for now I can give the
following preliminary parameters:
-altitude: 630km circular
-inclination: 97.91 degrees
Ok, back to satellite building now:)
Wouter Jan Ubbels PE4WJ
W.J. Ubbels MSc.
Delfi-C3 project manager electronic systems and communications
Faculty of Aerospace Engineering
Delft University of Technology
Hello robert- thank you for a very well written explanation of the SDX system. I understand it better now.
I'm still of the opinion that the satellites should be kept as simple as possible to increase reliability and life but I also believe in democracy and it sounds like it works well here. I dont agree with your "outdated" label of the old technology. Then again, I dont buy a new car every 5 years. Oscar 7 is a good example of the ruggedness of the old technology.
You're a very good tech writer, thanks for taking the time to explain, pat n2oeq
------- Original Message -------
>From : Robert McGwier[mailto:[email protected]]
Sent : 3/24/2007 11:54:26 AM
To : vk3jed(a)gmail.com
Cc : k8ocl(a)arrl.net; Patrick.McGrane(a)aceweb.com; amsat-bb(a)amsat.org
Subject : RE: [amsat-bb] Re: P3E transponder and launch
Thanks to everyone for the comments, concerns, and thoughtful remarks.
SDX is no magic bullet. It cannot perform any better than the analog
hardware around it and our careful work on doing the mixed signal work
and even more careful work to make sure it survives the rigors of
traveling through Van Allan radiation belts four times a day!
That said, it provides us with several things. The DESIGN of the SDX
will allow us to use a high dynamic range receiver in comparison to
those we have flown before and to actually realize the potential
presented to us by this receiver.
If we have this high dynamic range receiver, we can use a much lower
noise floor and wider dynamic range transmitter to provide cleaner
signals. This will be evidenced, if we do it right, by us no longer
hearing the noise floor of the transponder. Next, if we have
sufficient DSP horse power, we will be able to mitigate PAVE PAWS pulses
by doing pulse detection and subtraction. THIS IS A LINEAR OPERATION.
It will be much nicer than clipping. If the pulses get so large that we
are clipping then all bets are off but with an 80 dB dynamic range
receiver, this will be much less likely to happen. Stephensen has done
a detailed analysis of this and this is available on Eaglepedia.
Next we are designing in the ability to provide the most capable HELAPS
we have ever done. HELAPS is high efficiency linear amplification by
parametric synthesis. Technical papers by Karl are on both the AMSAT
and AMSAT-DL web sites. It is envelope elimination and restoration
amplification. It allows us to use very high efficiency nonlinear
amplifiers in the transmit chain and then have the "envelope" of the
hard limited signals from the transponder imposed on the signal just
before it hits the antenna by modulating the voltage on the last or last
few stages. If we do the final transistors and the driver, we can get
VERY high efficiency compared to what we have achieved in the past
WITHOUT all of the poor IMD we lived with to get the efficiency. SDX is
THE enabler in this.
SDX provides us with the ability to easily find all alligators and
impose our will on them. There will simply be no benefit to running an
EIRP that is larger than we decide to allow because YOUR INDIVIDUAL
signal will be suppressed!
Juan Rivera, WA6HTP, and his team are building the fancy receiver which
has been designed by KD6OZH and peer reviewed to death by others. Parts
are being purchased NOW and the goal is to have four soon. We are
building at least one to fit the P3E box shape.
Marc Franco, N2UO, has designed, using modern parts that are very
difficult to get without connections, a serious 2 meter final stage.
It will provide the highest efficiency 2 meter transmitter we have ever
flown for HELAPS.
Steve Hendricksen, a TCNJ engineering student, design a S band
amplifier in a senior engineering project directed study for Marc, Al
Katz (K2UYH), and I. He submitted this for competition in an amplifier
efficiency contest. He received an honorable mention and came in very
high in the rankings. However, his amplifier was the only one well in
excess of the minimum power, at 2.4 GHz rather than 1.0 GHz (the
As always there is the balance between "new with great promise but
untried" and "the old, standard but somewhat outdated". We can have
this argument all year and it will never be easily resolved.
AMSAT-UK has agreed to provide SDX software working with P3E and Eagle
teams. They have agreed to copy the AO-13 RF if none of these fancier
elements shows up and works. AMSAT-DL is planning for these contingencies.
So we have arranged for a small trial: Suisat-2 will carry a low power
SDX with a few of these capabilities. We are planning a very large
AMSAT engineering activity for this coming summer which you will hear
more about in the coming weeks.
I could go on but what I want to promise is this: I have been extremely
busy both professionally, personally, and with AMSAT things and I have
not done an Engineering Notebook in a while. I will do a detailed paper
on this for the next journal and it will be in my engineering notebook.
Following publication I will put the document with more backing
material on Eaglepeda as well and give it to AMSAT-DL for both our sites.
Tony Langdon wrote:
> At 10:46 AM 3/24/2007, John Champa wrote:
>> The reports I have seen is that the SDX sounded BETTER than the
>> traditional analog transponder. Bob, N4HY, can confirm that fact?
> I wouldn't be surprised at this one at all.
>> Anything other than SDX would be a step-backward for AMSAT.
> That's my viewpoint as well.
> 73 de VK3JED
AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair
"Taking fun as simply fun and earnestness in earnest shows
how thoroughly thou none of the two discernest." - Piet Hine
Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author.
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I am in need of a supplier of a MGF1402 GaAsfet. The device is for my faithful 70cm Home Brew Preamp. I know that it is 1980 technology but the ARRL handbook PCB I have is spaced just right for a 1402.
Tnx & 73
Quoting Graham Shirville <g.shirville(a)btinternet.com>:
> Delfi C3 will have a linear Mode B transponder - a triple cubesat
> for launch in June. See http://www.delfic3.nl/ for details
> To have one in a single cubesat would be a big challenge, especially if
> needs to share power with other on-board experiments. If we could
> fund/develop an amateur only cubesat then it could be a fun project!
> still dreaming!
> Graham G3VZV
The amateur-only cubesat model is a very exciting one since it reduces the
cost of launch considerably and provides the builders with a likely launch
scenario early in the process. Delfi C3 is really leading the way in this
field, and some of the compromises it makes are instructive. It has a
transmitter power of, 400mW, 6 to 10dB below what we are used to in LEO
linear birds. It also has no batteries, and will therefore work only when
I expect that the power trade-off will be acceptable and that a
fixed-elevation directional antenna with LNPA will still work well, though
CW might be more popular on this bird :-)
There seem to be many AMSAT operators who use large Az/El systems for LEOs;
perhaps, then, an even weaker transmitter on 2m might be acceptable. My
vote would be for an S-band downlink. It would be possible to put a patch
antenna on one face, but some of this gain is eaten up in increased 'path
loss'. Such a bird could be called a 'HardSat' in contrast to the so-called
FM 'EasySats' :-)