This is the new web site for Hearsat.org. HearSat was originally created as a mailing list and website in November 1995. The idea was conceived by John Corby (VA3KOT) in Canada and the late Ivan Artner (HA5TS) in Hungary. HearSat was modeled after the SeeSat mailing list and website but was targeted towards satellite enthusiasts who are interested in monitoring radio signals from satellites. The web site and mailing list were originally hosted by Grove Enterprises, publishers of Monitoring Times magazine until RA Labs, owned by Bob Arnold (N2JEU), stepped forward to generously offer hosting services. HearSat remains indebted to Bob for his continued support. The mailing list is now hosted on the QTH network (www.qth.net) owned by Al Waller (K3TKJ). The content of Hearsat.org is dynamically managed by a group of active satellite monitoring enthusiasts. If you are reading this site and what to add some content, please register as a user, then go to the forums and post in the appropriate place. There is an active IRC channel where you can chat to other satellite buffs in real time, you can get to this by using the 'Live Hearsat Chat Room' link in the left hand menu bar.

Chandrayaan-1 Lunar Transfer Trajectory Orbit

Submitted by pjm on Thu, 06/11/2008 - 07:12.

 From the ISRO website at http://www.isro.org/pressrelease/Nov04_2008.htm

The fifth and final orbit raising manoeuvre of Chandrayaan-1 spacecraft was successfully carried out today (November 4, 2008) morning at 04:56 am IST. During this manoeuvre, the spacecraft’s 440 Newton liquid engine was fired for about two and a half minutes. ? With this, Chandrayaan-1 entered the Lunar Transfer Trajectory with an apogee (farthest point to Earth) of about 380,000 km (three lakh eighty thousand km).

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Inmarsat 4F3 Launched!

Submitted by pjm on Sun, 28/09/2008 - 19:46.

19-08-2008 - Inmarsat has confirmed the successful
launch and acquisition of the third Inmarsat-4 satellite.

The satellite was launched on a Proton Breeze M rocket from the Baikonur Cosmodrome
in Kazakhstan at 11:43pm BST on 18 August. Inmarsat's
tracking station in Fucino, Italy was able to track the satellite while it was still
coupled to the Breeze M launch vehicle. Launch provider ILS confirmed successful
spacecraft separation at 8:46am BST on 19 August.
The I-4 F3 satellite will now undergo a period of deployment
and several weeks of comprehensive tests and maneuvers before being positioned in
geostationary orbit at 98º West.

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Amsat UK - live video feed

Amsat UK's meeting at the university of Surrey is being televised by the BATC. You can view the lectures live online at http://www.batc.tv/ch_live.php?ch=3&id=9

If you are interested in satellites and communications, you should watch some of the lectures, as they are on extreamly interesting topics, and if you are interested in amateur radio satellites, join Amsat-UK!

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  • 325 reads

Building a UHF-Helical Antenna

Submitted by Nils on Thu, 10/07/2008 - 15:33.
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JAXA/Selene doppler plot

Submitted by phil-ypq on Tue, 08/07/2008 - 18:45.
JAXA/Selene doppler plot

Selene appears then is phase-locked, then you can see me move the dish a couple of times before it drops out of phaselock and disappears behind the moon. About 50 minutes start to finish.

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Skynet 5C on station and operational

Submitted by pjm on Thu, 26/06/2008 - 21:52.

dish1.jpg
Skynet 5C started transmitting on X-Band today, with its TT&C beacon being on 7492.2GHz. The satellite arrived at its geostationary slot around the 21st June, and has been refining its position, which has now stabilized at 17.88 degrees West. The satellite also appears to have an S-Band TT&C / Beacon which transmits on 2252.486 plus or minus temperature drift.

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Nils - Clear comms on 261,675 FM


0:12 minutes (73.44 KB)

Hi, Clear Comms on 19th. June 08 around 18:00 UTC on 261,675 Mhz. FM (Fltsatcom8) from AOR.
Aggressor 9 November is calling Night 9 November for a Comm Check.
Regards, Nils

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Skynet 5C launched!

Submitted by pjm on Tue, 24/06/2008 - 22:24.
orbit1.jpgSkynet 5C was launched on the 12th of June 2008 from Kourou. It then spent several days on its Geosynchronous Transfer Orbit, and finally was boosted to the Geostationary orbit by its Apogee Boost Motor. In the Launch and Early Orbit Phase, the space craft was most likely spin stabilised at a rate of somewhere between 15 and 60 rpm around its Yaw axis. The Skynet 5C satellite most probably uses Nutation Sensors as per the Skynet 4's, in order to dampen out any nutation that would result in an end over end tumble during LEOP.
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