EXHIBIT 10.18

                                PLEDGE AGREEMENT


     PLEDGE  AGREEMENT,  dated as of July 22,  1997,  by and  between  Norman M.
Phipps (the "Executive") and LogiMetrics, Inc. (the "Company").

                              W I T N E S S E T H:

     WHEREAS,  the Executive has purchased from the Company  850,000 shares (the
"Shares")  of the  Company's  Common  Stock,  par value $.01 per share  ("Common
Stock"); and

     WHEREAS,  in  connection  with such  purchase the Company has loaned to the
Executive  the sum of  $459,000;  such loan being  evidenced  by a  non-recourse
secured promissory note (the "Note") in the principal amount of $459,000 made by
the Executive in favor of the Company; and

     WHEREAS,  the loan to the  Executive  is to be  secured  by a pledge by the
Executive  to the  Company  of the Shares  and the other  Collateral  referenced
herein; and

     WHEREAS,  the  parties  hereto  desire  to set  forth  the  terms of and to
evidence  the  Executive's  grant to the  Company of a security  interest in the
Collateral.

     NOW, THEREFORE,  in consideration of the mutual covenants herein contained,
and for other good and valuable  consideration,  the receipt and  sufficiency of
which is hereby  acknowledged,  the Executive  hereby agrees with the Company as
follows:

     Section 1.  Definitions.  The following terms, when used in this Agreement,
shall have the following  meanings (such definitions to be equally applicable to
the singular and plural forms thereof):

     "Default" means the failure to make any payment of principal of or interest
on, or any other amounts due under, the Note when due, whether at maturity, upon
acceleration or otherwise.

     "Distributions" means all stock dividends, liquidating dividends, shares of
stock  resulting  from  stock  splits,  reclassifications,   warrants,  options,
non-cash  dividends  and other  distributions  on or with respect to the Shares,
whether similar or dissimilar to the foregoing, but shall not include Dividends.

     "Dividends" means regular dividends declared with respect to the Shares.

     "Liabilities" means the Note, and all amounts becoming due thereunder,  and
all other payment  obligations  of the Executive  hereunder or thereunder or any
instrument executed pursuant hereto or thereto.

<PAGE>

     Section 2. Grant of  Security  Interest.  As  security  for  payment of all
Liabilities, the Executive hereby pledges, assigns and transfers to the Company,
and grants to the Company a continuing  security interest in and to, the Shares,
together with all Dividends and  Distributions,  interest and other payments and
rights with respect thereto,  together with all proceeds thereof  (collectively,
the "Collateral").  The Executive further pledges,  assigns and transfers to the
Company, and grants to the Company a continuing security interest in and to, and
agrees to duly endorse to the order of the Company,  any additional  Collateral,
together  will all proceeds  thereof,  delivered by the Executive to the Company
for the purposes of pledge under this Agreement. Any Collateral delivered by the
Executive to the Company may be endorsed by the  Company,  in its own name or in
the name of the  Executive,  on  behalf  of the  Executive  to the  order of the
Company.

     Section 3. Stock Powers, Endorsements,  Etc. The Executive shall, from time
to time, upon request of the Company,  promptly  execute such  endorsements  and
deliver to the Company such stock powers and similar documents,  satisfactory in
form and substance to the Company, with respect to the Collateral as the Company
may  reasonably  request  and  shall,  from time to time,  upon  request  of the
Company,  promptly transfer any securities which are part of the Collateral into
the  name  of  any  nominee  designated  by the  Company  on  the  books  of the
corporation or other entity issuing such securities; provided, however, that the
Company  shall not be entitled to effect or demand a transfer of the  Collateral
into the name of the Company or the Company's nominee without the consent of the
Executive unless and until a Default shall have occurred.

     Section 4. Certain Other  Agreements  Regarding  Collateral.  The Executive
shall deliver (properly endorsed where necessary) to the Company:

          (a) after a Default  shall have occurred and be  continuing,  promptly
upon receipt  thereof by the Executive  and without any request  therefor by the
Company, all Dividends and Distributions,  and other proceeds of the Collateral,
all of which shall be held by the Company as additional Collateral; and

          (b) at any time after a Default shall have occurred and be continuing,
promptly  upon  request of the  Company,  such  consents  or  proxies  and other
documents  as may be necessary to allow the Company to exercise any voting power
or other  right  with  respect to any  securities  included  in the  Collateral;
provided,  however, that unless a Default shall have occurred and be continuing,
the Executive shall be entitled:

               (i) to exercise,  as the Executive  shall deem  appropriate,  all
     voting  or other  powers  with  respect  to  securities  pledged  hereunder
     (including but not limited to the Shares); and

               (ii) to receive  and retain for the  Executive's  own account any
     and all Dividends paid in cash.

<PAGE>

     Section 5. Actions Upon Default. Whenever a Default shall have occurred and
be  continuing,  the Company may exercise  fro5m time to time any and all rights
and remedies  available to it under applicable law, including but not limited to
all rights of a secured party available to it under the Uniform Commercial Code.
Without limiting the above, the Company may from time to time, whether before or
after any of the Liabilities shall become due and payable, but only if a Default
shall have occurred,  without  notice to the  Executive,  take any or all of the
following actions:

          (a)  transfer all or any part of the  Collateral  into the name of the
Company or its nominee; and

          (b) execute (in the name, place and stead of the Executive) any or all
endorsements,  assignments,  stock powers and other instruments of conveyance or
transfer with respect to all or any of the Collateral.

          The Executive  understands that compliance with the Federal securities
laws,  applicable  blue sky or  other  state  securities  laws or  similar  laws
analogous in purpose or effect may  strictly  limit the course of conduct of the
Company  if the  Company  were to  attempt  to dispose of all or any part of the
Collateral  and may also  limit the  extent to which or the  manner in which any
subsequent  transferee of the Collateral  may dispose of the same.  Accordingly,
the  Executive  agrees that IF ANY  COLLATERAL  IS SOLD AT ANY PUBLIC OR PRIVATE
SALE,  THE  COMPANY  MAY ELECT TO SELL  ONLY TO A BUYER  WHO WILL  GIVE  FURTHER
ASSURANCES,  SATISFACTORY  IN FORM  AND  SUBSTANCE  TO THE  COMPANY,  RESPECTING
COMPLIANCE WITH THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED,  AND
ANY AND  ALL  APPLICABLE  STATE  SECURITIES  LAWS;  AND A SALE  SUBJECT  TO SUCH
CONDITION SHALL BE DEEMED  COMMERCIALLY  REASONABLE.  The Company shall have the
right to bid upon or purchase the Shares,  or any other part of the  Collateral,
or all of the foregoing, at any such sale, less any and all amounts owing to the
Company by the Executive under the Note,  this Agreement or otherwise,  and that
any such purchase is commercially reasonable.

     Section 6.  Application of Moneys.  Any moneys received by the Company upon
payment  to it of  any  Collateral  held  by it or as  proceeds  of  any  of the
Collateral  may be applied by the Company  first to the payment of any  expenses
incurred by it in connection with the Collateral, including, without limitation,
reasonable attorneys' fees and legal expenses,  and all other amounts payable to
the Company by the Executive,  and any balance of such moneys so received by the
Company may be applied to all Liabilities of the Executive  (including,  without
limitation,  the principal  amount of the Note  outstanding  whether or not such
principal  amount is at that time due and payable) in such order of  application
as the Company in its sole discretion may determine. Any amounts remaining after
payment of the  Liabilities  may be applied by the Company to the payment of any
and all other  amounts  owing,  whether or not then due, to the Company from the
Executive and any remaining balance thereafter shall be paid to the Executive.

<PAGE>

     Section 7. Release of Collateral.  Upon the indefeasible payment in full of
the Liabilities, the Company shall, upon the request of the Executive,  promptly
reassign and redeliver to the Executive the Collateral  which has not been sold,
disposed  of,  retained or applied by the Company in  accordance  with the terms
hereof,  together with such endorsements,  stock powers and similar documents as
the Executive may reasonably request.  Such reassignment and redelivery shall be
without warranty by or recourse to the Company,  except as to the absence of any
prior assignments by the Company of its interest in the Collateral. In the event
that the Executive  proposes to sell,  transfer or otherwise dispose of all or a
portion of the Shares,  upon the  request of the  Executive,  the Company  shall
release from its security  interest the Shares to be sold by the Executive  and,
at the sole expense of the  Executive,  shall deliver such Shares as directed by
the Executive,  free and clear of any security interest hereunder,  upon receipt
from or on behalf of the Executive of the net proceeds of such sale, transfer or
other disposition in cash in next day or immediately available funds.

     Section 8. Non-Recourse Nature of Liabilities.  The Company's sole recourse
for the payment of the Liabilities  shall be limited to the Collateral  securing
the  Note.  THE  COMPANY  SHALL NOT HAVE THE RIGHT TO  ENFORCE  THE  LIABILITIES
AGAINST THE EXECUTIVE OR ANY OF THE EXECUTIVE'S OTHER ASSETS OR PROPERTY.

     Section 9. Miscellaneous.

     (a) To the fullest extent permitted by applicable law, this Agreement shall
continue to be  effective or be  reinstated,  as the case may be, if at any time
any amount received by the Company in respect of the Liabilities is rescinded or
must  otherwise  be restored or returned by the Company upon the  insolvency  or
bankruptcy of the Executive or upon the appointment of any receiver, intervenor,
conservator,  trustee or similar  official for the Executive or any  substantial
part of his assets, or otherwise, all as though such payments had not been made.

     (b) No remedy  herein  conferred  is intended to be  exclusive of any other
remedy herein  conferred or otherwise  available to the Company,  but every such
remedy  shall be  cumulative  and in  addition  to  every  other  remedy  herein
conferred,  or conferred on the Company by any other  agreement or instrument or
now or hereafter existing at law, in equity or by statute.

     (c) Any provision of this Agreement which is prohibited or unenforceable in
any jurisdiction,  shall, as to such jurisdiction,  be ineffective to the extent
of such  prohibition  or  unenforceability  without  invalidating  the remaining
provisions  hereof,  and  any  such  prohibition  or   unenforceability  in  any
jurisdiction shall not invalidate or render  unenforceable such provision in any
other jurisdiction.

     (d) Except as otherwise  expressly provided herein, no term or provision of
this Agreement may be amended, waived, discharged or terminated orally, but only
by an instrument in writing signed by the parties.

<PAGE>

     (e)  THIS  AGREEMENT  AND  ALL  RIGHTS  HEREUNDER  SHALL  BE  CONSTRUED  IN
ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK WITHOUT GIVING
EFFECT  TO THE  CONFLICTS  OF LAWS  PROVISIONS  THEREOF.  THE  EXECUTIVE  HEREBY
CONSENTS  AND  SUBMITS TO THE  EXCLUSIVE  JURISDICTION  OF THE FEDERAL AND STATE
COURTS LOCATED IN THE STATE OF NEW YORK HAVING SUBJECT  MATTER  JURISDICTION  IN
CONNECTION  WITH ANY AND ALL DISPUTES  ARISING OUT OF OR IN CONNECTION WITH THIS
AGREEMENT, THE NOTE OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY. FURTHER,
THE EXECUTIVE HEREBY CONSENTS AND AGREES THAT SERVICE OF PROCESS BY THE COMPANY,
OR ANY  PARTY  ACTING  ON BEHALF OF THE  COMPANY,  SHALL BE DEEMED  VALIDLY  AND
PROPERLY  EFFECTED  AGAINST  THE  EXECUTIVE  UPON THE  MAILING OF A COPY OF SUCH
PROCESS BY CERTIFIED MAIL, POSTAGE PREPAID,  TO THE EXECUTIVE AT ITS ADDRESS SET
FORTH ABOVE.

     (f) No course of  dealing  and no delay on the part of any party  hereto in
exercising any right, power, or remedy conferred by this Agreement shall operate
as a waiver  thereof or  otherwise  prejudice  such party's  rights,  powers and
remedies hereunder or in connection  herewith.  No single or partial exercise of
any power or remedy  conferred  by this  Agreement  shall  preclude any other or
further exercise thereof or the exercise of any other right, power or remedy.

     (g) This  Agreement  shall inure to the benefit of and be binding  upon the
parties   hereto   and   their   respective   successors,   assigns   and  legal
representatives.

     (h) This Agreement  constitutes the entire agreement among the parties with
respect to the matters covered hereby and supersedes all previous written,  oral
or implied agreements and understandings  among the parties with respect to such
matters.

     (i) All notices or other  communications  required or  permitted  hereunder
shall be in writing and shall be delivered  personally,  by facsimile or sent by
certified,  registered or express air mail, postage prepaid, and shall be deemed
given which so delivered  personally,  or by facsimile,  or if mailed, five days
after the date of mailing, as follows:

           If to the Company:        50 Orville Drive
                                     Bohemia, New York 11716
                                     Telephone:        (516) 784-4110
                                     Facsimile:        (516) 784-4132
                                     Attention:        Chief Executive Officer


<PAGE>


           If to the Executive:      5 Crystal Court
                                     Neshanic Station, New Jersey 08853
                                     Telephone:        (908) 369-5980
                                     Facsimile:        (908) 369-4596

or at such other  addresses  as shall be furnished in writing to the other party
hereto.

     (j) The headings in this  Agreement are for reference  purposes  only,  and
shall not in any way affect the meaning or interpretation

     (k) This  Agreement  may be executed in one or more  counterparts,  each of
which shall be deemed an original  agreement,  but all of which  together  shall
constitute one and the same instrument.

<PAGE>

     IN WITNESS WHEREOF, the parties have duly executed this Agreement as of the
date first written above.

Witness:



/s/Stephanie Trocchia                             /s/ Norman M. Phipps
______________________________                    ________________________
Name:  Stephanie Trocchia                         Norman M. Phipps


                                                  LOGIMETRICS, INC.



                                                  By:  /s/ Russell J. Reardon
                                                  ____________________________
                                                  Name: Russell J. Reardon
                                                  Title: Chief Financial Officer