Athenoxat-1 New beacon receiving
Athenoxat-1 new beacon
From: Yesie Brama
Date: Mon, 11 Dec 2017 11:06:26 +0000 (UTC)
Dear all,
Greetings from Athenoxat-1 team :)
It's been a while and we're glad to inform that our satellite Athenoxat-1
(ATX) is doing well until today, entering into her 2 years life in space.
To celebrate this event, we have modified the data beacon hopefully for
the pleasure of HAM activities around the world.
As we understand, HAM community has been able to decode ATX data beacon
using HS Soundmodem (version 0.15b?). So just to explain the new structure
of the data beacon: Apart from the COM header/sync marker etc, the real
data size for each packet expected will be 216 bytes.
The first byte = type of data of either {2, 4, 5} which means {in-house
icon image, thumbnail images produced by ATX, the text-note to explain
the image contain in the thumbnail}
For the type of data 2 and 5 (single chunk concept):
The next 2 bytes = the variable file size of the icon image / text-note,
for example 192. Thus the next 192 bytes will be thecontent of the image/
text-note itself.
The next remaining (216 - 1 - 2 - 192) = 21 bytes can be ignored.
he icon image is in .bmp format and text note is ASCII characters.
For the type of data 4 (multiple chunks concept):
The next 1 byte = the variable size of last remaining bytesNext 2 bytes=
the variable file size of the thumbnail imageNext 2 bytes = chunk marker
For example, the thumbnail image is 3748 bytes. The beacon transmission
will be chunk by chunk with each chunk has size 210 bytes.
Therefore roundup (3748 / 210) = 18 with the modulus or last remaining
bytes = 178 bytes.So in this example, each packet will have the first
4 bytes the same value, and the next 2 bytes is chunk marker, and next 210
bytes will be the content of thumbnail image and should expect 18 packets
transmitted. First packet will have chunk marker = 18 and next packet
decrements to 17 and so on. The last packet should have chunk marker = 1.
Specific to the packet with chunk marker = 1, the remaining
(216 - 1 - 1 - 2 - 2 - 178) = 33 bytes can be ignored.
The thumbnail is in .jpg format. Should there be any difficulty in
reconstructing the data, you can send the recorded packets (not just
the screenshot) you've received to us, and we'll be glad to help.
In addition, we would really like to send the overdue QSL cards to you
who has been curious and received our ATX beacon last year.
We are thinking to send this QSL card via ATX transmission too. What is
needed is only for us to make the appointment :)
Please let us know your confident good quality AOS of ATX and for how
much duration. Then we'll upload to the satellite Flight Planner so that
when ATX is passing your AOS time, she'll start transmitting the chunks
of the QSL card.
We've prepared the QSL cards and they are about 30kB size, thus the
required transmission duration should be less than 5 minutes.
This is because the chunks will be sent in the interval of 2sec, as not
tostress ATX radio. In case there's interference / bad connection during
the transmission, we can resend you only the specific chunk markers that
you miss at the next appointment time.
We hope this activity will spark the interest of HAM people around the
world who can receive ATX beacon. Since this is a kind of new experiment/
features of ATX, let us please test it with your first before we publish
this information to the public. When this new features are confirmed good,
we'll update our website too with this detailed information. Looking
forward to your feedback then. Thanks much in advance for your time.
Kind Regards, Athenoxat-1 Team, Microspace Rapid 9V1FC / 9V1SQ
Athenoxat-1 icon
From: Roland Zurmely
To: Mineo Wakita
Date: Tue, 12 Dec 2017 21:56:11 +0000 (UTC)
Hi Mineo,
Icon received from Athenoxat-1:
73 de Roland PY4ZBZ
Athenoxat-1 new icon
From: Yesie Brama
Date: Fri, 15 Dec 2017 07:51:15 +0000 (UTC)
Dear Mike, Roland,
again really big thanks for your efforts the last few days verifying
our new beacon. Great that now the decoder is ready for use for others,
and for bigger file size :)
Dear Roland,
would you be available for receiving your QSL card from Athenoxat?
If yes, could you please let us know the date and time in UTC?
It'll be better if that is at least 1 day ahead, so we have time to
arrange and upload our FP file to the satellite.
Also, can I confirm with you that more or less this is your location?
-19.454511, -44.254498One file should be about 30kB and it'll be about
5min (2sec interval for each packet/chunk).
If you have 2 slots available, we can schedule 2x transmission for
2 different cards. Just let us know then :)
Dear Wakita-san,
We were really very surprise that your location can still receive
Athenoxat. From your lat long, it seems the pass elevation can be
about 2deg. I saw you receive the Morse CW, have you tried the data
beacon? We're wondering if 2deg can still be good for data packet..
Thanks again everyone, Kind Regards, 73 Yesie
Re: AW: Athenoxat-1 new beacon
From: Yesie Brama
To: Mineo Wakita
Date: Sat, 16 Dec 2017 04:12:35 +0000 (UTC)
Thanks a lot Wakita-san :)
about 30sec after the start of CW should be the data beacon.
Kind Regards, Yesie
Subject: Re: AW: Athenoxat-1 new beacon
From: Mineo Wakita
To: Yesie Brama
Sent: Saturday, 16 December 2017, 8:44
Hello Yesie,
I summarized your reports for Athenoxat-1 new beacon
in my HP. Thank you.
I will try to receive CW and Packets at an elevation
angle of 2 degrees over Japan.
JE9PEL, Mineo Wakita
Athenoxat-1 icon re-experiment by JE1CVL and JE9PEL
Athenoxat image decoder by DK3WN
Thanks Roland PY4ZBZ for kiss file and Yesie 9V1SQ for documentation.
Very appreciated :-)
thumb_1.jpg | Global view: Colombia and Venezuela with Lake Maracaibo in view
thumb_2.jpg | Global view: North West of Australia and Tiwi Island
thumb_3.jpg | Wide-angle view: Islands of Bali and Lombok, Indonesia
thumb_4.jpg | Narrow-angle night view: Ho Chi Minh City, Vietnam
thumb_5.jpg | Global view: North of Australia
thumb_6.jpg | Global view: West of Africa with River Niger in view
thumb_7.jpg | Wide-angle view: Region of Luzon, the Philippines
Athenoxat-1 manual decoding
Athenoxat-1 block structure
[Portuguese]
A figura seguinte mostra a estrutura de cada bloco:
O primeriro dos 149 blocos
tipo 04 = imagem, Os 4 primairos bytes sao descartados
resto de bytes no ultimo bloco CFh = 207
Tamanho da imagem 7A36h = 31286
contador de blocos 95h = 149, vai diminuindo para cada bloco ate 1 no ultimo
Os dados sao os 210 bytes restantes
[English]
The following figure shows the structure of each block:
The first of the 149 blocks
type 04 = image, The 4 prime bytes are discarded
remaining bytes in the last block CFh = 207
Image Size 7A36h = 31286
block counter 95h = 149, decreases for each block to 1 in the last one
The data is the remaining 210 bytes
Athenoxat-1 heard 4k8 GMSK by JE9PEL
I heard today 4k8 GMSK signal of Athenoxat-1 at a pass about 2 degrees
elevation on 17 Dec 2017. I confirmed that it was transmitting 4k8 GMSK
signal 30sec after the start of CW. I got the feeling that I could decode
even at an elevation of 2 degrees. I will try to receive it again later.
http://dl.dropbox.com/s/t31k8coxk3lppch/71217at2.wav
ATXdecoder by PY4ZBZ
http://www.qsl.net/py4zbz/athenoxat.htm
http://www.qsl.net/py4zbz/zbz/ATXdecoder.zip
http://amsat-br.org/tools/arapuca/frames2.txt
Puzzle from Athenoxat-1
http://wakky.asablo.jp/blog/imgview/2018/03/15/4d88eb.png.html
Received by PY4ZBZ and several ham in the world
Completed QSL card from Athenoxat-1
From: Yesie Brama
To: Mineo Wakita
Cc: Roland Zurmely, Dr.Ing.Giulio MANZONI
Date: Sat, 17 Mar 2018 07:13:29 +0000 (UTC)
Dear Wakita-san,
Just to inform that your QSL card for Athenoxat-1 has been completed
yesterday by PY4ZBZ, 9V1SV, PQ2HX and YB3MBN.
I saw that your website has the incomplete image, so if you'd like
to get the complete image, it's available in our website :)
http://www.micro-space.org/ham.html
Have a nice weekend,
73 deAthenoxat-1 team(Yesie 9V1SQ)
[Reference] My_HP No.895,899 / PY4ZBZ HP
Back to Top
Back to Home Page