TETRA Contract

SOFTWARE RADIO TECHNOLOGY PLC                         

                      TETRA TECHNOLOGY LICENCE AGREEMENT                       

The Directors of Software Radio Technology plc ("SRT") are pleased to announce
that SRT has signed a TETRA technology licence agreement with an established
OEM manufacturer of professional mobile radio products in Taiwan.

The customer will use SRT's reference design to create a TETRA handset which is
expected to be launched into the market in late 2006. SRT will be paid a
licence and product development support fee, which is payable in stages against
milestones during the development of the customer's handset, plus a royalty on
every unit manufactured in accordance with its standard business model. The
contract is mutually exclusive in respect of Taiwan and is intended to form the
basis of a long term partnership.

Simon Tucker, SRT's Commercial Director said:

"This agreement is an important development for SRT. The key to success for our
TETRA business is for our customers to supply as large a proportion of the end
user market as possible, thereby generating substantial royalties for SRT.
Entering into an agreement with an OEM manufacturer enables SRT to reap the
benefit of the established sales channels of the OEM's customers, who will be
addressing the market with their established brands. As with all our customers,
SRT will work closely with the customer to deliver an international standard
TETRA handset in the form required."

Software Radio Technology plc                                    01761 409500
                                                                             
Simon Tucker                                     [e-mail]
                                                                             
Shamus Kelly                                     [e-mail]
                                                                             
Westhouse Securities LLP                                        0161 838 9140
                                                                             
Tim Feather                               [e-mail]
                                                                             
Tavistock Communications                                        020 7920 3166
                                                                             
Christian Taylor-Wilkinson                                                   

Notes for Editors

About Software Radio Technology

SRT is a developer and licensor of digital wireless technology reference
designs that facilitate and fast-track the manufacture of sophisticated digital
communications and tracking/surveillance products for use within the
professional homeland security market.

SRT currently licenses technology solutions for TETRA handsets (communication
devices used by professional users such as police & military) and automatic
identification systems (AIS) for ships and boats.