<PAGE>

                                    UNITED STATES
                          SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C. 20549

                                ----------------------
                                     FORM 10-K/A
                                  (Amendment No. 1)
(Mark One)
/X/  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934.  FOR THE FISCAL YEAR ENDED MARCH 31, 1998.

                                          OR

/ /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES
     EXCHANGE ACT OF 1934.  For the transition period from _______ to ______.

                            Commission file number 0-15895

                            DIGITAL MICROWAVE CORPORATION
                (Exact Name of Registrant as Specified in Its Charter)

                DELAWARE                               77-0016028
        (State of Incorporation)          (I.R.S. Employer Identification No.)

     170 ROSE ORCHARD WAY, SAN JOSE,                      95134
               CALIFORNIA                              (Zip Code)
     (Address of Principal Executive
                Offices)

Registrant's telephone number, including area code:  (408) 943-0777

Securities registered pursuant to Section 12 (b) of the Act:  NONE

Securities registered pursuant to Section 12 (g) of the Act:

                        COMMON STOCK-PAR VALUE $0.01 PER SHARE
                                   (Title of class)
     Indicate by check mark whether the Registrant:  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.   Yes  X     No
                                               -----     -----

     Indicate by a check mark if disclosure of delinquent filers pursuant to
Item 405 of Regulation S-K is not contained herein, and will not be contained,
to the best of Registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of the Form 10-K or any
amendment to this Form 10-K. / /

     State the aggregate market value of the voting stock held by non-affiliates
of Registrant (based on the last reported sale price of $7.00 per share on the
Nasdaq National Market) as of June 24, 1998:  Approximately $241,636,808.

     As of June 24, 1998, there were 46,685,992 shares of Common Stock, par
value $0.01 per share, outstanding.

                         DOCUMENTS INCORPORATED BY REFERENCE
1.   Portions of the Registrant's Annual Report to Stockholders for the fiscal
     year ended March 31, 1998 are incorporated by reference into Parts I and II
     of this Form 10-K Report.  With the exception of those portions which are
     incorporated by reference, the Registrant's Fiscal 1998 Annual Report is
     not deemed filed as part of this Report.

2.   Portions of the Registrant's Proxy Statement for the Annual Meeting of
     Stockholders to be held on August 4, 1998 are incorporated by reference
     into Part III of this Form 10-K Report.

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                                EXPLANATORY NOTE

     This Amendment No. 1 to the Company's Annual Report on Form 10-K for 
the fiscal year ended March 31, 1998 is being filed solely for the purpose of 
refiling Exhibit 13 thereto to correct a printer's error which resulted in 
the omission of certain financial information from page 19 of Exhibit 13.


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                                      SIGNATURES


Pursuant to the requirements of Section 13 or 15 (d) of the Securities Exchange
Act of 1934, the Registrant has duly caused this Report to be signed on its
behalf by the undersigned, thereunto duly authorized.

Date:     July 20, 1998.

DIGITAL MICROWAVE CORPORATION

BY:        /S/ CHARLES D. KISSNER
     ------------------------------
     Charles D. Kissner
     CHAIRMAN OF THE BOARD AND
     CHIEF EXECUTIVE OFFICER

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Report has been signed below by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated.

<TABLE>
<CAPTION>
 SIGNATURES                      SIGNING CAPACITY                DATE
 ----------                      ----------------                ----
<S>                              <C>                             <C>
 /s/  CHARLES D. KISSNER         Chairman of the Board and       July 20, 1998
------------------------------   Chief Executive Officer
      Charles D. Kissner

              *                  Vice President, Chief           July 20, 1998
------------------------------   Financial Officer & Secretary
      Carl A. Thomsen            (Principal Financial and
                                 Accounting Officer)

              *                  Director                        July 20, 1998
------------------------------
      Richard C. Alberding

              *                  Director                        July 20, 1998
------------------------------
      John W. Combs

              *                  Director                        July 20, 1998
------------------------------
      Clifford H. Higgerson

              *                  Director                        July 20, 1998
------------------------------
      James D. Meindl

              *                  Director                        July 20, 1998
------------------------------
      Billy B. Oliver

              *                  Director                        July 20, 1998
------------------------------
      Howard Oringer

</TABLE>

* By:  /s/ CHARLES D. KISSNER
     -------------------------
        Charles D. Kissner,
         Attorney-In-Fact

<PAGE>


                                    EXHIBIT INDEX

EXHIBIT
NUMBER    DESCRIPTION

+2.1      Agreement and Plan of Reorganization and Amalgamation, dated December
          22, 1997, among the Company, South Amalgamation Sub Ltd. and MAS
          (incorporated by reference to Exhibit 2.1 to the Company's
          Registration Statement on Form S-4 (File No. 333-45053)).

+3.1      Restated Certificate of Incorporation, as amended as of March 24,
          1998.

+3.2      Amended and Restated Bylaws, dated as of March 24, 1998.

+4.1      Form of Common Stock Certificate (incorporated by reference to Exhibit
          4.1 to the Company's Annual Report on Form 10-K for the year ended
          March 31, 1988).

+4.2      Rights Agreement dated as of October 24, 1991 between the Company and
          Manufacturers Hanover Trust Company of California, including the
          Certificate of Designations for the Series A Junior Participating
          Preferred Stock (incorporated by reference to Exhibit 1 to the
          Company's Current Report on 8-K filed on November 5, 1991).

+10.1     Digital Microwave Corporation 1984 Stock Option Plan, as amended and
          restated on June 11, 1991. (incorporated by reference to Exhibit 10.1
          to the Company's Annual Report on Form 10-K for the year ended March
          31, 1991).

+10.2     Form of Installment Incentive Stock Option Agreement (incorporated by
          reference to Exhibit 28.2 to the Company's Registration Statement on
          Form S-8 (File No. 33-43155)).

+10.3     Form of installment Non-qualified Stock Option Agreement (incorporated
          by reference to Exhibit 28.3 to the Company's Registration Statement
          on Form S-8 (File No. 33-43155)).

+10.4     Lease of premises located at 170 Rose Orchard Way, San Jose,
          California (incorporated by reference to Exhibit 10.5 to the Company's
          Annual Report on Form 10-K for the year ended March 31, 1991).

+10.5     Lease of premises located at 130 Rose Orchard Way, San Jose,
          California. (incorporated by reference to Exhibit 10.6 to the
          Company's Annual Report on Form 10-K for the year ended March 31,
          1991).

+10.6     Lease of premises located at 110 Rose Orchard Way, San Jose,
          California. (incorporated by reference to Exhibit 10.7 to the
          Company's Annual Report on Form 10-K for the year ended March 31,
          1991).

+10.7     Microelectronics Technology, Inc. Development Agreement dated as of
          March 9, 1984 (incorporated by reference to Exhibit 10.8 to the
          Company's Registration Statement on Form S-1 (File No. 33-13431)).

+10.8     Form of Indemnification Agreement between the Company and its
          directors and certain officers (incorporated by reference to Exhibit
          10.16 to the Company's Registration Statement on Form S-1 (File No.
          33-13431)).


<PAGE>

+10.9*    Technology Transfer & Marketing Agreement dated October 2, 1987
          between Microelectronics Technology Inc. and the Company (incorporated
          by reference to Exhibit 10.17 to the Company's Annual Report on Form
          10-K for the year ended March 31, 1988).

+10.10*   Product Acquisition Agreement dated as of September 23, 1992 between
          the Company and Microelectronics Technology, Inc. (incorporated by
          reference to Exhibit 10.26 to the Company's Annual Report on Form 10-K
          for the year ended March 31, 1993).

+10.11*   Product Acquisition Agreement dated as of December 28, 1992 between
          the Company and Microelectronics Technology, Inc. (incorporated by
          reference to Exhibit 10.27 to the Company's Annual Report on Form 10-K
          for the year ended March 31, 1993).

+10.12*   Teaming Agreement dated as of November 16, 1993 between the Company
          and Siemens AG (including the Supply Agreement dated November 16, 1993
          between Siemens AG and E-Plus Mobilfunk GmbH) (incorporated by
          reference to Exhibit 10.29 to the Company's Annual Report on Form 10-K
          for the year ended March 31, 1994).

+10.13    Agreement on Exchange of Interim Equipment dated October 27, 1994
          (incorporated by reference the Company's Quarterly Report on Form 10-Q
          for the quarter ended December 31, 1994).

+10.14    Digital Microwave Corporation 1994 Stock Incentive Plan, as amended
          and restated (incorporated by reference to the Company's Proxy
          Statement for the Annual Meeting of Stockholders to be held on
          August 4, 1998).

+10.15    Employment Agreement dated May 1, 1996 between the Company and Charles
          D. Kissner (incorporated by reference to Exhibit 10.36 of the
          Company's Annual Report on Form 10-K for the year ended March 31,
          1996).

+10.16    Form of Employment Agreement between the Company and certain executive
          officers (incorporated by reference to Exhibit 10.38 of the Company's
          Annual Report on Form 10-K for the year ended March 31, 1996).

+10.17    Amendment to Loan Agreement dated June 24, 1996 between the Company
          and the CoastFed Business Credit Corporation (incorporated by
          reference to Exhibit 10.38 of the Company's Quarterly Report on Form
          10-Q for the quarter ended June 30, 1996).

+10.18    Amendment to Loan Agreement effective as of June 25, 1996 between the
          Company and the CoastFed Business Credit Corporation (incorporated by
          reference to Exhibit 10.39 of the Company's Quarterly Report on Form
          10-Q for the quarter ended September 30, 1996).

+10.19    Form of Employment Agreement between the Company and certain executive
          officers (incorporated by reference to Exhibit 10.28 to the Company's
          Annual Report on Form 10-K for the year ended March 31, 1997).

+10.20    Credit Agreement, dated as of June 30, 1997, by and between the
          Company and Bank of America National Trust and Savings Association
          (incorporated by reference to Exhibit 10.1 to the Company's Quarterly
          Report on Form 10-Q for the quarter ended June 30, 1997).

+10.21    Lease, dated April 5, 1995, by and between Metropolitan Life Insurance
          Company and Digital Microwave Corporation, relating to 180 Rose
          Orchard Way, San Jose, California (incorporated by reference to
          Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the
          quarter ended June 30, 1997).


<PAGE>

+10.22    Sublease Agreement, dated August 29, 1997, by and between Wyse
          Technology Inc., Digital Microwave Corporation and Wyse Technology
          Investments, Inc., relating to 3745 North First Street, San Jose,
          California.

+10.23*   Purchase Agreement, dated January 15, 1998, between the Company and
          Microelectronics Technology, Inc.

+10.24*   Purchase Agreement, dated January 15, 1998, between the Company and
          REMEC, Inc.

+10.25*   Business Agreement, dated January 26, 1998, between the Company and
          Microelectronics Technology, Inc.

 13.1     Portions of 1998 Annual Report to Stockholders incorporated herein by
          reference.

+21.1     List of subsidiaries.

+23.1     Consent of Independent Public Accountants (included on page 28 of this
          Annual Report on Form 10-K).

+24.1     Power of Attorney (included on page 22 of this Annual Report on Form
          10-K).

+27.1     Financial Data Schedule for the fiscal year ended March 31, 1998.

+27.2     Restated Financial Data Schedule for the fiscal year ended March 31,
          1997.

+27.3     Restated Financial Data Schedule for the fiscal year ended March 31,
          1996.

   +      Exhibit previously filed.

   *      Confidential treatment of certain portions of this exhibit has been
          requested.