(an archived page, this may contain outdated or
The view from 200 miles up.
currently in APRS/digi mode - relays beacons.
will update my website . . .
I will update my
website . . .
update my website .
posit beacon relay in Low Earth Orbit !
have gotten so accustomed to hearing of the numerous school contacts
with the amateur radio station onboard the International Space Station,
many have forgotten about the digital mode. The Expedition 16 crew
currently has a busy construction schedule, and has not scheduled many
school contacts. This actually was welcome news to some hams, as the
ARISS station has been in "unattended digipeat" mode recently.
have a page
in here from 2005 describing how this works, but this is a good time
for a quick review.
This time I'm using AGWPE & UIView32 with the sound card in the
instead of an external modem (TNC). These programs provide PTT
signaling on the RTS pin of Com1. My longitude and latitude are
provided in the beacon text, and the only real change to the program
from terrestrial APRS operations, is to specify "ARISS" in the
'unproto' field. This sets the broadcast destination of the beacon
packets to request that the ISS digipeater re-transmit your beacon.
When a ground-based APRS-IS gateway station hears your beacon on the
ISS downlink frequency of 145.825, it will forward that information off
to the great global APRS-IS database, making it available to internet
portals such as www.findu.com
. Once word spread last fall that the ISS digi was back on, hams
world-wide started sending their beacons. This is the most activity
I've ever seen on the ISS/APRS frequency.
it helps to know when the station is coming by. I still use Instant
This tells me when, what
direction, and how much doppler shift to expect.
it happens, I have only a simple vertical in the attic right now for
145.825, so there is no need to aim. I've been heard by ISS when it was
as low as 6 degrees above the horizon (over Canada) using only ~15
watts output. Higher gain antenna might require less power, but then it
would require some pointing/tracking. Some stations simply set their
beacon for every 60 sec, and don't need a schedule, or pointing. Others
interact, and acknowlege the other stations heard. I have even received
QSL cards . . . This is really neat ..!.. Thanks NASA !!!
guess one glorious result of this is seeing your name in lights, so to
speak . . .
Here are snips from the FindU page showing who has
been recenly heard, as well as the raw packets.
addition to the maps (as the example above) you can see callsigns from
all over the world, with their location. Using FindU further, and
clicking on a callsign, you can get a more detailed and interactive map
This simple activity is
a good jump point into the world of Amateur Satellites .
Take this opportunity to check it out, while the ISS is still in
'digi-mode'. . .
Additional resources for these activities
can be found easily : http://home.comcast.net/~k9jkm/ARISS_Packet_How_To/
these projects tie together, as my new omnidirectional satellite
antennae are also useful for VHF/UHF weak-signal/ssb activities. The EggBeater
II from K5OE
presents circular polarization for satellites, but is effectively
horizontally polarized at the horizon. Not too many choices available
for horizontal-omni antennae.
This is the 70cm
edition, the 2m version should be done this week.
Thanks Jerry... 73
organizations are consolidating some of the overhead associated with
registration and training of the membership. Join us on the 2nd
Thursday evening of each month for a good meeting at the HMC EMA EOC
(and learn more about this).
Remember, the severe weather
season is available year-round.
The Huntsville Hamfest
is coming in August.
This year's hamfest is also hosting the ARRL
Southeastern Division Convention.
|Recent discoveries, rants and raves,
and experiments :|
+ Be sure to check www.somenet.net
for interesting articles inbetween updates to this page.
= Narrow Band Emergency Messaging System - check it out (new Yahoo
Propagation Map = using APRS beacons to visualize current
+ APRS.FI = another view of
the APRS-IS database, from Finland.
an example of an auto-updating view of my immediate area
(shows multiple stations !)+ QSOnet = WoW! You
should try this. Read my
review on SomeNet.
= My weather instruments are still active and logging.
I'm not yet satisfied with the radiation shield I made for the external
= gradually getting my old logs entered . . .
Previous pages from the archives
+ 2007 . . .
+ 2006 . . .
2005 . . .
organizations, projects and web sites
that I continue to support and
promote : |