As previously posted, the ARISSat-1 amateur radio satellite remains inside the International Space Station awaiting its anticipated release into orbit this July.
According to the American Radio Relay League (ARRL) website, the ARISSat-1 satellite aboard the International Space Station will be on the air using the station’s external antenna, starting on Monday, April 11, at 14:30 UTC and continue until 10:30 UTC on April 13. This temporary activation is to celebrate the 50th anniversary of the first human spaceflight by cosmonaut Yuri Gagarin.
You can read the details about the frequencies, modes and reception confirmation procedure at the ARRL site. A useful real-time satellite tracker can be viewed at ARISSat-1 website.