AMSAT-NAJAS-2 Launch Successful

The JAS-2 spacecraft was successfully launched aboard H-2 #4 from Tanegashima Island, Japan, on August 17, 1996, at 0153 UTC. AMSAT-NA extends warmest congratulations to the JAS-2 team.

Keplerian Elements

Keplerian elements are now available in the weekly AMSAT KEPS bulletins.

Current Status

As of Sunday August 18 at 1500 UTC, the status was as follows according to JR1NVU, the JARL JAS-2 Command Station and Tak Okamoto, JA2PKI, of JAMSAT:

Confirmation of Orbit

From the results of doppler measurement, it was confirmed that JAS-2 is in the planned orbit.


During the 1900JST pass on August 17th, the command MAIN RELAY ON was transmitted to JAS2 and confirmed with telemetry.

Attitude Control and Digital System

PSK telemetry is being transmitted on 435.91 MHz. An attempt to spin up the spacecraft is ongoing. 9600bps digital mode and digitalker service will be started soon.

The plan calls for about 10 days of spinning the spacecraft up to 10 rpm. The digital mailbox is expected to be enabled about three days after launch. The digital mode callsign will be 8J1JCS.


Call for Telemetry Observations

We need your further help to know how well the new born chick is doing in the space. Please try to copy CW telemetry as much as possible and send them with time stamp data to:

All of us especially the baby sitter JR1NVU greatly appreciate your support.

Recognizing JAS-2 Telemetry

JAS-2 uses the same CW telemetry frequency as Fuji OSCAR-20 (JAS-1b), 435.795 MHz. Use the following two simple tests to determine which satellite you're listening to:

Decimal or Hexadecimal
JAS-1B uses decimal digits, 0 through 9.
JAS-2 uses hexadecimal digits, 0 through 9 and A through F.
Digits per Channel
JAS-1B sends three digits per channel.
JAS-2 sends only two digits per channel.

For example, the JAS-2 telemetry format looks something like this:

HI 1A 1B 1C 1D
   2A 2B 2C 2D
   3A 3B 3C 3D
   4A 4B 4C 4D
   5A 5B 5C 5D
   6A 6B 6C 6D HI

The "HI" at either end is traditional in the amateur satellite service, dating all the way back to OSCAR-1 (see Sounds from the First Satellites).

Further Information

See also the JARL JAS-2 Web page and the NASDA Web page.

Updated 24 August 1996. Links updated 22 November 2000. Most of the contents of this page were taken from announcements posted to the AMSAT-BB mailing list by Tak Okamoto, JA2PKI, of JAMSAT, Fujio Yamashita, JS1UKR, of the JARL Technical Laboratory, and JR1NVU, the JARL JAS-2 command station. Feedback to KB5MU.