AIS agreement signed

SOFTWARE RADIO TECHNOLOGY PLC                         

                             AIS Agreement Signed                              

The Directors of Software Radio Technology plc ("SRT") are pleased to announce
that SRT has signed L3 Communications Corporation (Aviation Recorders Division)
("L3") as a customer for its AIS technology.

L3 is a US-based company that will use technology provided by SRT to create an
AIS Aids to Navigation ("AtoN") product for sale through its international
distributor network. The AtoN product will mainly be installed on buoys and is
an important element of the growing national AIS systems. They provide
permanent hazard warnings to shipping and vital environment information on
tides, temperature and wind to authorities.

SRT and L3 expect the product to be one of the first into the market meeting
all required specifications. Prototypes are expected in September 2006 with
production by the end of the year. SRT will be paid an initial fee with ongoing
royalties on each product sold.

Simon Tucker, SRT's Commercial Director said: "Following the successful launch
of our Class B technology earlier this year, we took the decision to invest
further in our AIS business through the development of the other elements of an
AIS system. AtoN is an important element of all AIS systems. L3 has a
reputation as a high quality supplier of these types of products with a well
established international brand and distributor base. We are therefore very
excited to be working with L3 in this area."

Margaret Browning, L3 Communications (Aviation Recorders Division) Technical
Director said: "L3 has worked hard to establish itself as one of the leading
players in the growing US and international AIS market. The launch of an AtoN
product in 2006 is consistent with our strategy of continuing to lead in this
market. SRT's AIS expertise and technology are well known and therefore we are
delighted to have them as our partners."

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                  [e-mail]

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. Currently SRT develops and supplies
technology solutions for Marine AIS and PMR-TETRA.

About L3 Communications

Based in the Florida, USA, L3 Communications Corp is a NASDAQ listed company
providing a variety of essential communication and electronics products for
multiple applications and markets.