This weekend's Plasma Thrust space experiment using Amateur Radio has been postponed until after the delivery of a new rig next April.

On the AMSAT bulletin board Andy G0SFJ passes on the following information:

It was earlier announced that the timetable of SpEx “Shadow-beacon” sessions on November 26-27, 2011 was reduced because the crew are newcomers and need more time to gain experience. For the same reason previously announced sessions on December 2-5, 2011 are cancelled.

Sergey Samburov RV3DR, the employee of space-rocket corporation "Energia" who is responsible for amateur radio on ISS, explains that the onboard radio was accidentally switched on standard simplex 145.825 MHz not the required duplex 144.360 / 145.825 MHz digipeater mode because of the old age of the onboard gear. It has been in use more than 10 years. Sometimes Sergey has already observed malfunction like this.

A new radio is planned to be delivered to the ISS by cargo vehicle in April and Mission Control Center (TsUP) plans to hold new SpEx “Shadow-beacon” sessions in May-June 2012.

Again many thanks for those submitted reports and made other assistance! The results of data processing will be presented on our site. We wait for further cooperation!
http://knts.tsniimash.ru/Shadow/en/

Amateur Radio assistance requested: ISS Plasma Thrust Shadow Experiment
http://www.southgatearc.org/news/november2011/
amateur_radio_assistance_requested.htm