TETRA Technology Supply Agreement

SOFTWARE RADIO TECHNOLOGY PLC                         

      TETRA technology supply agreement with German handset manufacturer       

The Directors of Software Radio Technology plc ("SRT" or the "Company") are
pleased to announce that SRT has entered into an agreement with PMRS GmbH
("PMRS") of Germany for the supply of TETRA handset technology in the form of
its RF ASIC chip. The initial agreement is worth a minimum of Euro 350,000 over
the next 12 months with further upside as handset sales increase. The first
delivery of 1,600 units was made at the end of January.

PMRS is the only German-based manufacturer of TETRA handsets and is seeking to
address the demand created by the German government's recent announcement of
its decision to roll out a national TETRA network with a capacity of up to
500,000 users. The network is primarily being developed for the emergency
services such as the police, fire and ambulance services. The Directors
understand that these markets will be the principal targets for PMRS.

Simon Tucker, SRT's Managing Director said, "SRT has invested substantially in
its TETRA technology. We are excited that our highly scalable business model
will start to generate royalty revenues during 2007. Our engineering teams will
support PMRS to ensure that their target opportunities are maximised for our
mutual benefit."

Enquiries:                                                                     
                                                                               
Software Radio Technology plc                                      01761 409500
Simon Tucker                                                                   
Managing Director                                                              
                  
                                    
Hanson Westhouse Limited                                          0113 246 2610
Tim Feather                                                                    


About SRT:

Founded in 1987 and quoted on AIM in 2005, SRT focuses on the development of
turnkey technology product solutions for homeland security applications. SRT's
technologies are used by manufacturers to fast track and de-risk the
development of their own products. SRT has focused on the areas of professional
voice and data radio communications such as TETRA and maritime identification
and tracking systems, such as AIS: both of which are global standards. The
company has a worldwide customer base with a business model based on customers
paying royalties on each product manufactured.

About PMRS:

PMRS is a German based and owned company which manufacturers a variety of radio
communications equipment. TETRA is a recent addition to its product line. 
www.pmrs-gmbh.com