Many of you may have read about the successful QSO between DJ5AR and
Jan, PA3FXB using the ISS as a
passive reflector, similar to airplane scatter or EME.
Using EME protocols and periods of 30 seconds, they completed the QSO
using CW. This involved modifying
satellite tracking software, and compensating for the Doppler shift. You
can read details and hear audio files on
DJ5AR's blog here:
http://www.dj5ar.de/?p=878
This is quite an accomplishment, but I instantly began to wonder if it
couldn't also be pulled off with much simpler
equipment using WSJT software such as FSK441 (commonly used for rapidly
moving meteor scatter QSO's).
Doppler shift would not be a problem, even with the quick moving ISS,
since the software is already optimized for
short transmission periods.
It might be necessary to modify the standard messaging to allow for a
complete QSO exchange to happen faster,
or to shorten the periods to 15 seconds.
432 MHz has already proven to be very productive for airplane scatter,
so I also wondered if 432 might be a good
band for this type of experimentation. Lots of satellite operators are
already equipped to operate on 432 and to track
the ISS in real time with their antennas.
I'd love to hear some discussion about the possibility of this. It could
open up a lot of potential grid squares on 432 and 1296
simply using FSK441.
Another problem to be solved is classifying the propagation mode in LoTW
and other logging software. Would this be considered "airplane scatter"
or would we have to invent a whole new name for this?
Congratulations to both hams for this accomplishment!
--
--
73,
Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL 35114
EM63nf
6M VUCC #1712
AMSAT #38965
Grid Bandits #222
Southeastern VHF Society
Central States VHF Society Life Member
Six Club #2484
Active on 6 Meters thru 1296, 10GHz & Light
Hello BB's
I have a question for any of the fine satellite operators of New Zealand
and Australia. Does any one in those areas monitor AO7 as it enters
into the Eclipse as it nears the coast of Antarctica?
The pass that is flying over right now has an eclipse period duration of
9:40. I was curious as to how the satellite was reacting in the
"twilight" period as the satellite approached the full eclipse and
unfortunately the satellite doesn't appear to be near any populated
areas when it comes out of this eclipse. this is one of the longer
eclipse's that occurs during this period of the Eclipse Cycle.
Any information would be of interest to me.
thanks for the help from those who have emailed!
73
Frank
K4FEG
EM55aj84ta
Greetings,
I am making preparations for the K9MOT Motorola Solutions Amateur Radio Club Field Day setup. I plan to operate the satellite station once again and give demos as I have done in the past few years.
Hopefully, I can get the gremlins out that have popped up during the past few FD's. I am interested in demoing packet through the ISS, assuming it will be in packet mode this year.
I know all stations are limited to one ISS contact. I am curious how many other FD stations are planning to make a packet contact and would it be worth the trouble?
See you on the birds at Field Day! Please give K9MOT a shout should you hear us. Have fun!
73, Adrian AA5UK
I am just back from Kaliningrad (Russia) where I was able to visit the
Russian satellite communication ship, "Cosmonaut Viktor Patsaev". They
opened up the ship for me although I wasn't allowed into the laboratory
because although the ship is moored in a museum it is still in use.
However I was allowed onto the decks to photograph the antennae and they knew I was a radio ham. So I photographed the antennae and measured what I
could.
My report is on my website http://www.andythomas.eu - it's downloadable from the bottom of the first page. All errors are my own. I hope you find it interesting.
73 de andy g0sfj
HI all,
I am using Kenwood ts2000 for data reciecving purposes from the satellite.
'But i am not able to set it up accordingly kindly help.
Regards,
Aayush Yadav,
Pratham- Student Satellite,
Indian institute of Technology Bombay.
Hi,
I just had an email from Google Play support and I can't issue 0.9 as it
needs the original authors signing key.
I am (with the approval of AMSAT) going to move it to AmsatDroid 1.0 as
a fund raising app.
73
- Dave
On 29/05/13 00:01, Clayton Coleman wrote:
> Dave,
>
> I appreciate your updates. I'm looking forward to a donation-ware
> version incorporating some of the user-suggested features. In the
> mean time I will attempt an upgrade to 0.9 tomorrow.
>
> 73
> Clayton
> W5PFG
>
>
> On Tue, May 28, 2013 at 2:40 PM, David A B Johnson <dave(a)g4dpz.me.uk
> <mailto:[email protected]>> wrote:
>
> Hi,
>
> FYI, the app has been temporarily removed from the Google Play
> Store while I reload it with the
> new signing key.
>
> Should be back tomorrow.
>
> Will post another message when it's back.
>
> The info site is still up:
>
> https://sites.google.com/site/hamsatdroid/
>
> 73
>
> - Dave, G4DPZ
> _______________________________________________
> Sent via AMSAT-BB(a)amsat.org <mailto:[email protected]>. Opinions
> expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
Again, thinking to FD...
- My FT-847 predates bi-directional CAT i.e. no computer assisted Doppler
- I may be the only one at the station i.e. no helper to man the antenna (Arrow), so I may need to do everything.
- assume the transponder LEO birds
Has anyone tried this?:
1) mount a standard TV antenna horizontal
2) align the horizontal rotor axis 90 deg to the orbit
tilt (inclination?) of the intended bird (so if the
bird went directly overhead, a beam mounted on the mast would track)
3) but, mount the antenna on the horizontal mast such that it can be set tilted off the mast
0 to 90 degs to the mast axis (from horizon to zenith, and in practice set it to the maximum elevation of the intended pass)
4) operation: set the rotator (in 2) and aim the beam to the AOS
point of the pass (in 3), pan the orbit remotely from the operator position.
5) the rotator axis and angle of the beam to mast would have to be set for each pass.
Do-able?
Bill W1PA
Taking some advice from the group today, I closed SATPC32 and opened
SATPCISS in an attempt to monitor a morning pass. When I reopened
SATPC32, I noticed that I had no satellites listed in my group, the
countdown program did not launch, etc.
Further examination revealed that all frequency data was missing in the
CAT window too. I tried restarting the computer, downloading new KEP
data, etc. Nothing seemed to work.
Any ideas?
--
--
73,
Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL 35114
EM63nf
6M VUCC #1712
AMSAT #38965
Grid Bandits #222
Southeastern VHF Society
Central States VHF Society Life Member
Six Club #2484
Active on 6 Meters thru 1296, 10GHz & Light
