It is very rare to hear clear CW from the AO-7B
telemetry beacon around 145.972. Most of the time
there is no beacon at all. Sometimes there is
jibberish. Usually the signal is very weak.
With AO-7 going through eclipse on every orbit, the
satellite can come out of eclipse in different modes/
options. Recently there have been times where the
beacon has transmitted clear CW over North America,
something I have not heard over the years.
According to the DK3WN website, there was some cw
telemetry back in 2002 when the satellite was discovered
to be working again. And there was some discussion about
what is valid data based on the last 3 digits sent in the
24 group block of data. If the value is 649, 650, or 651,
the data is likely valid.
I first heard the image of the cw signal around 958. It was
so loud I thought it was a valid user at first. But since
the cw was all numbers I tuned up to the beacon frequency and
there the signal was louder than anything I have ever heard
on AO-7. It took a while for me to get the recorder running
but I managed to capture some data. After playing it back I
found that there was only one block of data where the last
group was valid, a 649. Other later transmissions were loud
but the data was much different and the last group was not
correct.
I couldn't locate a telemetry calculator at first so I decided to
build one on Excel using the formulae provided by DK3WN. The
data follows:
AO-7B Telemetry 24July2014 2318UTC
POS Parameter Range Raw Real
1A Total Solar Array Current 0-3000ma 171 2094.5ma
1B +X Solar Panel Current 0-2000ma 193 110ma
1C -X Solar Panel Current 0-2000ma 157 830ma
1D +Y Solar Panel Current 0-2000ma 108 1810ma
2A -Y Solar Panel Current 0-2000ma 286 250ma
2B RF Power Out 70/2 0-8watts 204 7.3728W
2C 24 Hour Clock Time 0-1440min 201 15.16min
2D Batt Ch/Discharge Current-2000/+2000 207 -1720ma
3A Batt Voltage 6.5-16.4 361 12.7V
3B Half Batt Voltage 0-10v 397 9.7V
3C Batt Charge Reg #1 0-15v 340 6V
3D Batt Temperature -30 to +50C 300 95.8C
4A Baseplate Temperature -30 to +50C 446 27.72C
4B PA Temperature 2/10 -30 to +50C 401 94.32C
4C +X Face Temperature -30 to +50C 430 51.4C
4D +Z Face Temperature -30 to +50C 498 -49.24C
5A PA Temp 70/2 -30 to +50C 545 29.2C
5B PA Emitter Current 2/10 0-1167ma 502 92.84MA
5C Module Temp 70/2 -30 to +50C 543 32.16C
5D Inst. SW Regulator 0-93ma 527 33.14MA
6A RF Power Out 2/10 0-10,000mw 606 23.076MW
6B RF Power Out 435 0-1000mw 643 219.9MW
6C RF Power Out 2304 0-100mw 679 255.881MW
6D Midrange Telemetry Cal 0-.5v 649 0.49
There are some values which are obviously not correct.
Some sensors might not be working properly since some
values are out of range. However, the solar panel numbers
might be somewhat correct. I wouldn't doubt it if the
transmitter was putting out 7 watts at the time.
Perhaps there are those who are familiar with the AO-7
telemetry that can make some sense out of the data.
Unfortunately we don't have multiple blocks of good data
to compare readings. Maybe some have recorded recent CW
data and can find some good blocks that can be shared here.
The data was copied on my Arizona remote and Skype was being
used to listen. But I am fairly confident that the cw copied
is correct.
73,
John K8YSE
All AMSAT-NA Members,
The annual election packet was mailed prior to 15 July, and should have been received by now. Many
members have already returned their ballots. If you have not, please take a few minutes to review the
position statements of the various candidates, make your selections, and then mail them. This is
especially important if you are in a non-North American QTH. In that case, it is strongly recommended
that you use air mail or other expedited means. This is your opportunity to select the AMSAT-NA
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73s,
Alan Biddle
WA4SCA
AMSAT Corporate Secretary
Hi,
We had a problem with decoding data for FC2 in the data warehouse this
morning (31st Nov).
This has been fixed and if you have any bin files which you recorded
between 0:00 and 14:00 utc, please replay
them into the warehouse.
Many thanks
Dave, G4DPZ
Greetings,
I will be operating portable and activating EN62 on SO-50. My pass starts at 0146Z (2046hrs CDT). If you need the grid this is your chance. I will confirm on LOTW, eQSL, or direct.
73s de KC9WPR
Sent via the Samsung GALAXY S®4, an AT&T 4G LTE smartphone
Hi to the list,
i hope somebody can help me to solve the problem.
I on a Kenwood TS-790E Radio, the UHF and the VHF Antennas
Connected to the radio.
I have bought a dongle USB that I use to receive the AO-73 and the UKUBE.
The problem I have is when I have the antennas connected to the radio
And want to listen on the Dongle, I have to disconnect the antenna from the
Radio an connect it to the dongle and vice versa if I want to listen from
the radio.
I would like to know if there is a way like a switch that I can commutate
the antenna on the
Utilizer I need at the moment.
Any help will be really appreciated.
Thanks in advance
73's de Enzo IK8OZV
EasyLog 5 BetaTester
EasyLog PDA BetaTester
WinBollet BetaTester
D.C.I. CheckPoint Regione Campania
Skype: ik8ozv8520
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I hope someone can launch a 100 of them, single channel ,pileup ,total chaos ,someone keying down on the entire pass what more would you want.
All we need to bust a crazy pile up is a 300 watt mfj amp right? Lets all work to the good of the satellite part of the hobby. SSB/CW birds are the only way to go and if you build it they will come . Now if someone can build a multi channel FM bird then do it. Lets face it guys ,everyone got mad trying to work AO51 and AO27. Was it fun making a call to a grid you wanted only to have someone key down on him coming back to you, Is this what you want , Then go to 20 meters DX. Single channel FM birds are obsolete,
Damon
Good evening,
I heard a station calling CQ on CW at the upper end of the passband on
AO-73 at around 0318Z. He drifted up and out of the passband before I
could get the full call, but I'm reasonably certain it was WB5H??.
No other activity but the sound of my voice was heard for the six
usable minutes before the satellite entered sunlight.
Was it anyone here? Or does anyone know who that might have been.
Admittedly, my CW is not very good.
73,
Paul, N8HM
