Director/PDMR Shareholding

SOFTWARE RADIO TECHNOLOGY PLC                         

                           ("SRT" or the "Company")                            

                         Director / PDMR Shareholding                          

SRT announces that it received notification on 21 April 2011 that Simon Rogers,
Chairman of the Company, sold 250,000 ordinary shares of 0.1p each at a price
of 40p per share on 20 April 2011. Following the sale Mr. Rogers holds
13,508,900 ordinary shares representing 12.76 per cent. of the issued share
capital of the Company. Mr. Rogers sold the shares to satisfy institutional
demand for the Company's shares in the market.

Enquiries:                                                                   
                                                                             
Software Radio Technology plc                                    01761 409500
                                                                             
Simon Tucker / Richard Hurd                                                  
                                                                             
Westhouse Securities Limited                                    0113 246 2610
                                                                             
Tim Feather / Matthew Johnson                                                
                                                                             
Leander PR                                                       07795 168157
                                                                             
Christian Taylor-Wilkinson