The thought never even occurred to me that AIS might have it's own dedicated radio downlink, I assumed AIS like other ISS data would go via the broadband Internet connection. A dedicated downlink would require the creation and maintenance of a ground-station network.

The eoPortal has a wealth of information on the AIS experiment and mentions the ARISS involvement, see https://directory.eoportal.org/web/eoportal/satellite-missions/i/iss-colais

I could see no mention of a dedicated transmitter, the article says: "10 days of near-real-time data show that 80% of the messages collected in the period could be delivered through the station's communications network with data latency significantly less than 1 hour."

To me that implies it's going via the Internet link which I think may be KU-Band via Geostationary satellites ? http://www.universetoday.com/108215/compare-the-space-stations-internet-spee...

73 Trevor M5AKA

On Sunday, 7 September 2014, 16:10, Nitin Muttin vu3tyg@yahoo.co.in wrote:

IthinkthedownlinkfrequencyoftheAISpayloadontheISS couldbedifferentfromtheterrestrialfreq. 73 Nitin(vu3tyg) Sent from Yahoo Mail on Android From:"M5AKA" m5aka@yahoo.co.uk Date:Sun, Sep 7, 2014 at 20:30 Subject:Re: [amsat-bb] AIS On The ISS

Dave, AIS is receive only, around 162 MHz.

73 Trevor M5AKA

On Sunday, 7 September 2014, 14:35, Dave Marthouse dmarthouse@gmail.com wrote:

In this week's Amsat News there was a story on the AIS experiment on the ISS. What's it's downlink frequency and what form of modulation is used?