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SEC Form 4
FORM 4

[  ] Check this box if no longer
subject to Section 16. Form 4 or Form
5 obligations may continue.
See Instruction 1(b).
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility
Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
Johnsen, Russell K.
(Last)                      (First)                      (Middle)
48 Brams Point Drive
(Street)
Hilton Head Island,    SC   29926
(City)                      (State)                      (Zip)
2. Issuer Name
and Ticker or Trading Symbol

Mercury Computer Systems, Inc.
MRCY
3. I.R.S. Identification
    Number of Reporting
    Person, if an entity
    (voluntary)
4. Statement for
    (Month/Day/Year

05/01/2003

5. If Amendment,
    Date of Original
    (Month/Day/Year)
6. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X Director      10% Owner
   Officer (give title below)        Other (specify below)

Description           Board of Director
7. Individual or Joint/Group
    Filing (Check Applicable Line)

X   Form filed by One Reporting Person
     Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security
    (Instr. 3)
2.Transaction
Date
(Month/Day/Year)
2A. Deemed Execution Date, if any
(Month/Day/Year)
 3. Transaction
    Code
    (Instr. 8) 		4. Securities Acquired (A) or Disposed Of (D)
    (Instr. 3, 4, and 5)
5. Amount of
    Securities
    Beneficially
    Owned Following
    Reported Transaction(s)

    (Instr. 3 and 4)
6. Owner-
    ship
    Form:
    Direct (D)
    or
    Indirect (I)

    (Instr. 4)
7. Nature of
     Indirect
     Beneficial
     Ownership

    (Instr. 4)
Code
V
Amount
A/D
Price
Common Stock
05/01/2003
P
2,100
A
$21.30
D
Common Stock
05/01/2003
P
900
A
$21.32
3,000
D


Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
    (Instr. 3)
2. Conver-
    sion or
    Exercise
    Price of
    Deri-
    vative
    Security
3. Transaction Date

(Month/
Day/
Year)
3A. Deemed Execution Date, if any

(Month/
Day/
Year)
 4. Transaction Code
    (Instr.8) 		5. Number of Derivative
    Securities Acquired (A)
    or Disposed Of (D)

    (Instr. 3, 4 and 5)
6. Date Exercisable(DE) and
    Expiration Date(ED)
    (Month/Day/Year)
7. Title and Amount of
    Underlying Securities
    (Instr. 3 and 4)
8. Price
    of
    Derivative
    Security
    (Instr.5)
 9. Number of
    Derivative
    Securities
    Beneficially
    Owned
    Following
    Reported
    Transaction(s)
    (Instr.4) 		10. Owner-
ship
Form of
Deriv-
ative
Securities:
Direct (D)
or
Indirect (I)

(Instr.4) 		11. Nature of
      Indirect
      Beneficial
      Ownership
      (Instr.4)
Code
V
A
D
DE
ED
Title
Amount or Number of Shares

Explanation of Responses:

 
By: Date:
/s/ Joseph M. Hartnett 05/01/2003
Corporate Controller and Chief Accounting Officer
** Signature of Reporting Person
SEC 1474 (9-02)


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Potential persons who are to respond to the collection of information contained in this form are not
required to respond unless the form displays a currently valid OMB Number.
Additional Information Reported For This Form
Name and Address of Reporting Person*
Johnsen, Russell K.
(Last)                      (First)                      (Middle)
48 Brams Point Drive
(Street)
Hilton Head Island,    SC   29926
(City)                      (State)                      (Zip)
Issuer Name
and Ticker or Trading Symbol

Mercury Computer Systems, Inc.
MRCY
Statement for
(Month/Day/Year)

05/01/2003
 
LIMITED POWER OF ATTORNEY
FOR
MERCURY COMPUTER SYSTEMS, INC.
SECTION 16(a) FILINGS


Know all by these presents, that the undersigned hereby constitutes and appoints each of Joe Hartnett and Jack Alexander, the undersigned's true and lawful attorney-in-fact to:

(1)        execute for and on behalf of the undersigned, in the undersigned's capacity as an officer, director and/or stockholder of Mercury Computer Systems, Inc. (the "Company"), Forms 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder;

(2)        do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 4 or 5 and timely file such form with the United States Securities and Exchange Commission (the "SEC") and any stock exchange or similar authority; and

(3)  &nb sp;     take any other action of any type whatsoever which, in the opinion of such attorney-in-fact, may be necessary or desirable in connection with the foregoing authority, it being understood that the documents executed by each such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve, provided, however, that the undersigned does not grant to each such power-of-attorney the right to engage in any transactions involving the securities of the Company on behalf of the undersigned, including without limitation, the right to purchase or sell any securities of the Company.

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that each such attorney-in-fact, or each such attorney-in-fact's substitute or substitutes (any such substitute also being referred to herein as an "attorney-in-fact"), shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted. The undersigned acknowledges that each attorney-in-fact, in serving in such capacity at the request of the undersigned or such attorney-in-fact, is not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934


The undersigned agrees that each such attorney-in-fact shall not be liable for any error of judgment or for any act done or omitted to be done or for any mistake of fact or law except for each such attorney-in-fact's own bad faith, and the undersigned agrees to indemnify and to hold each suc h attorney-in-fact harmless against any loss, claim, damage, liability or cost incurred on each such attorney-in-fact's part arising out of or in connection with acts undertaken or omitted to be taken as an attorney-in-fact hereunder.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of
and transactions in securities of the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorney-in-fact. This Power of Attorney may be filed with the SEC as a confirming statement of the authority granted herein.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 1 day of May 2003.


/s/Russell K. Johnsen