<PAGE>





                           AMENDMENT TO IRREVOCABLE PROXY
                           ------------------------------


              Amendment dated June 13, 1996 to Irrevocable  Proxy dated March 7,
     1996 between  SFM  Group, Ltd.  ("Proxyholder")  and Murray  H.  Feigenbaum
     ("Principal"):

              WHEREAS  Principal  issued  and  delivered  to   Proxyholder  that
     certain Irrevocable Proxy dated March 7, 1996 ("Proxy");

              WHEREAS  Principal  desires to  retire  from  his  employment with
     LogiMetrics, Inc. ("Company");

              WHEREAS Principal  and Proxyholder  desire to amend  the Proxy  to
     provide  for   its   continuance,   notwithstanding  the   termination   of
     Principal's employment with the Company;

              NOW, THEREFORE,  in consideration of the  foregoing, Principal and
     Proxyholder agree as follows:

              1.      The  Proxy  is  hereby amended  in  its  entirety and  the
     following substituted therefor:

                      "KNOW  ALL   MEN  BY  THESE  PRESENTS   that  the
              undersigned, Murray H. Feigenbaum  (the "Principal"), does
              hereby make, constitute  and appoint SFM Group,  Ltd. (the
              "Proxyholder"), his true and lawful attorney,  for him and
              in his  name, place  and stead,  to  act as  his proxy  in
              respect of  50%  of all  the  shares  of common  stock  of
              LogiMetrics, Inc. ("Stock"), a  Delaware corporation  (the
              "Corporation") owned of  record by the Principal  or which
              are eligible  to  be voted  by  the Principal  (except  as
              otherwise   provided   in  this   irrevocable   proxy)  as
              stockholders of  the  Corporation (the  "Shares") for  the
              following exclusive  purposes:  (i)  voting the Shares  in
              favor  of the election  of two  persons designated  by the
              Proxyholder and three persons designated  by Phipps, Teman
              & Company, L.L.C.,  as members of the  Corporation's Board
              of  Directors and  (ii) voting the  Shares with respect to
              any  of   the  following   matters:     (i)  mergers   and
              acquisitions; (ii)  sale of all  or substantially all  the
              Corporation's   assets,   giving  and   granting   to  the
              Proxyholder full power  and authority to the  premises, as
              fully as it might or  could do if personally  present with
              full power  of substitution,  appointment and  revocation,
              hereby  ratifying  and   confirming  all  that  its   said
              attorneys shall do or cause  to be done by  virtue hereof.
              Nothing contained  herein  shall  preclude  the  Principal
              from selling Stock.

                      This proxy  shall not be revocable  or revoked by
              the Principal, may not be assigned  by the Proxyholder and
              is coupled with  an interest and shall be binding upon the
<PAGE>




              Principal  and   the   respective   heirs   and   personal
              representatives  of  the  Principal   until  December  31,
              1998."

              2.      As amended hereby  the Proxy  shall remain  in full  force
     and effect.

              IN WITNESS  WHEREOF, Principal and Proxyholder  have executed this
     Amendment to Irrevocable Proxy the date and year first above written.


                               SFM Group, Ltd.

                               By: /s/ Lawrence Schneider   
                                   -------------------------
                               Name: Lawrence Schneider     
                                     -----------------------
                               Title: President             
                                      ----------------------



                               /s/ Murray H. Feigengaum     
                               -----------------------------
                               Murray H. Feigenbaum




























                                        - 2 -
<PAGE>