ARISSat-1/KEDR activation planned

ARISSat-1/KEDR Project Manager Gould Smith, WA4SXM said this week the latest status, discussed during the International ARISS teleconference Sergey Samburov, RV3DR announced the ARISSat battery will be charged late July and a test of the system will be conducted on the ISS from 1915 UTC 30 July to about 1200-1400 UTC 31 July.

During the test ARISSat-1 will be in LOW power mode, this means that it will transmit about 40 seconds and then shut down for 2 minutes and then transmit for 40 seconds, etc.
The standard ARISSat-1/KEDR 2m downlink band plan should be
transmitted. Additionally, the FM signal also downlinked on 437.55 MHz.

As to the date of deployment, Gould summarized,
“The deployment date for ARISSat is still subject to change. As of July 14 we are looking at a 3 Aug 2011 date for EVA 29 and the ARISSat-1/KEDR deployment. The ARISSat/KEDR deployment is the first task of the EVA, so it will occur fairly soon after the EVA begins. We will let everyone know more as we know more.”

145.950 MHz FM Downlink:
FM transmissions will cycle between a voice ID as RS01S, select telemetry values, 24 international greeting messages in 15 languages and SSTV images. One of the messages will be a conversation between Yuri Gagarin and ground control. See the next news item for pointers to get your station ready to receive the SSTV images.

435 MHz – 145 MHz Linear Transponder:
The linear transponder will operate in Mode U/V (70 cm Up, 2m Down). It is an 16 KHz wide inverting passband and the convention will be to TX LSB on the 435 MHz uplink and RX USB on the 145 MHz downlink. This mode is designed to work with low power transmitters and omni antenna.

145.919 MHz/145.939 MHz CW Beacon:
The CW transmissions will be callsign ID RS01S, select telemetry, and callsigns of people actively involved with the ARISS program.

145.920 MHz SSB BPSK-1000 Telemetry:
The BPSK transmissions will feature a new 1kBPSK protocol developed by Phil Karn, KA9Q to be readable in low signal level conditions. The BPSK data will transmit satellite telemetry.

The ARISSat-1/KEDR BPSK-1000 downlink is transmitted in SSB mode on 145.920 MHz. When the CW2 beacon on 145.919 MHz is active this indicates that the BPSK-1000 format is being transmitted. If the CW1 beacon on 145.939 MHz is active this indicates the backup of BPSK-400 format is being transmitted.

Transmitting at 100 mW, both BPSK rates include Forward Error
Correction (FEC) and it is expected that modest quarter-wave
antennas with low-loss coaxial cable will provide sufficient
signal strength for decoding and display by the ARISSatTLM

Download the Windows ARISSatTLM free ground station soundcard demodulator and display software:

Download the Mac ARISSatTLM software:

The ARISSatTLM software user guide is available: (

Get your color ARISSat-1/KEDR Frequency Guide: (

ARISSat-1/KEDR Presentation Slides (~1MB) (

ARISSat-1/KEDR Dayton Presentation Slides (

Follow ARISSat-1/RadioSkaf-V on Twitter:!/arissat1
In USA you can also text ‘follow Arissat1’ to 40404 with your
cell phone. (leave off the quotes).

Gould Smith, WA4SXM
ARISSat-1/KEDR Project Manager