Document:

THE SECURITIES  REPRESENTED BY THIS DEBENTURE HAVE NOT BEEN REGISTERED
          UNDER THE  SECURITIES  ACT OF 1933 (THE  "ACT")  OR  APPLICABLE  STATE
          SECURITIES  LAWS (THE "STATE  ACTS")  AND SHALL NOT BE SOLD,  PLEDGED,
          HYPOTHECATED,  DONATED, OR OTHERWISE  TRANSFERRED  (WHETHER OR NOT FOR
          CONSIDERATION)   BY  THE  HOLDER  EXCEPT  UPON  THE  ISSUANCE  TO  THE
          CORPORATION OF A FAVORABLE OPINION OF ITS COUNSEL AND/OR SUBMISSION TO
          THE  CORPORATION  OF SUCH OTHER  EVIDENCE  AS MAY BE  SATISFACTORY  TO
          COUNSEL  FOR TEE  CORPORATION,  TO THE EFFECT  THAT ANY SUCH  TRANSFER
          SHALL NOT BE IN VIOLATION OF THE ACT AND THE STATE ACTS.

                          ACRODYNE COMMUNICATIONS, INC.
                            (a Delaware Corporation)

                                                                 March_____,2000

                                                                   $2,000,000.00

     Acrodyne Communications,  Inc., a Delaware corporation (the "Corporation"),
is indebted  and, for value  received,  promises to pay to the order of Sinclair
Broadcast  Group,  Inc.  ("Sinclair")  on demand (the "Due Date")  (unless  this
Debenture shall have been sooner called for redemption as herein provided), upon
presentation  of  this  Debenture,  Two  Million  Dollars  ($2,000,000.00)  (the
Principal  Amount"),  or so much  thereof as has been  advanced  or  re-advanced
hereunder from time to time, and to pay interest on the Principal  Amount at the
rate of ten and one-half  percent (10.5%) per annum  (calculated on the basis of
three hundred sixty days (360) per year) as provided herein.

     The Corporation covenants, promises and agrees as follows:

     1 . Interest  Interest which shall accrue on the Principal  Amount shall be
payable in monthly installments on the first day of each month in each and every
calendar  year until the  Principal  Amount and all accrued and unpaid  interest
shall have been paid in full. If this Debenture  shall be issued on a date other
than the first day of a calendar month,  the interest  payable shall be prorated
upon  the  number  of days of such  calendar  month  period  during  which  this
Debenture shall have been issued and outstanding.  The first payment of interest
shall be made on April 1, 2000. All accrued and unpaid interest shall be payable
on the Due Date. All payments of principal and interest or principal or interest
shall be made at 10706 Beaver Dam Road, Cockeysville, Maryland 21030, or at such
other place as my be designated by the holder hereof

     2. Redemption.

          2.1.  This  Debenture  is subject to  redemption  at the option of the
Corporation  in whole or in part prior to the Due Date at any time and from time
to time  without  penalty or premium. The Corporation  may exercise its right to
redeem  this  Debenture  prior to maturity  by giving  notice  (the  "Redemption
Notice")  thereof to the holder of this  Debenture as it appears on the books of
the

<PAGE>
Corporation,  which notice shall specify the term of redemption  (including  the
place at which the holder of the  Debenture may obtain  payment),  the principal
amount of the Debenture to be redeemed (the 'Redemption Amount") and shall fix a
date for redemption (the "Redemption  Date"),  which date shall not be less than
thirty  (30) days nor more  than  forty  five  (45)  days  after the date of the
Redemption Notice.

          2.2. On the Redemption Date, the Corporation shall pay all accrued and
unpaid  interest on the Debenture up to and including  the  Redemption  Date and
shall pay to the holder hereof a dollar amount equal to the Redemption Amount.

     3. Conversion

          3.1.  The  holder of this  Debenture  shall  have the  right,  at such
holder's  option,  at any  time,  to  convert  all but not less than all of this
Debenture  into such  number of fully  paid and  nonassessable  shares of Voting
Common Stock,  $0.01 par value, of the Corporation (the "Common Stock") as shall
be provided herein.

          3.2. The holder of this  Debenture may exercise the  conversion  right
provided in this Section 3 by giving written notice (the "Conversion Notice") to
the  Corporation  of the exercise of such right and stating the name or names in
which the stock certificate or stock certificates for the shares of Common Stock
are to be issued and the address to which such certificates  shall be delivered.
The Conversion  Notice shall be accompanied by this Debenture and payment of the
Conversion  Rate (as defined  below).  The number of shares of Common Stock that
shall be issuable upon conversion of the Debenture shall equal Three Dollars and
Forty  Five  Cents  ($3.45)  per  share  (the  "Conversion   Rate")  as  applied
proportionately  to the Principal Amount  outstanding on the Conversion Date (as
defined below);  provided; however,  that in the event that this Debenture shall
have been partially  redeemed,  shares of Common Stock shall be issued pro rata,
rounded to the nearest whole share.

          3.3.  Conversion shall be deemed to have been effected on the date the
Conversion  Notice is given (the  "Conversion  Date").  Within five (5) business
days after receipt of the Conversion  Notice,  the  Corporation  shall issue and
deliver by hand against a signed receipt therefor or by United States registered
mail, return receipt requested,  to the address designated by the holder of this
Debenture in the Conversion Notice, a stock certificate or stock certificates of
the Corporation  representing the number of shares of Common Stock to which such
holder is  entitled  and a check or cash in payment of all interest  accrued and
unpaid on the Debenture up to and including the Conversion Date.

          3.4. Taxes. The Corporation shall pay all documentary,  stamp or other
transactional  taxes and  charges  attributable  to the  issuance or delivery of
shares of stock of the Corporation upon conversion;  provided; however, that the
Corporation  shall not be  required  to pay any taxes  which may be  payable  in
respect of any transfer  involved in the issuance or delivery of any certificate
for  such  shares  in a name  other  than  that  of the  record  holder  of this
Debenture.

          3.5. Reservation of Shares. The Corporation shall at all times reserve
and keep available,  free from preemptive rights, unissued or treasury shares of
Common Stock sufficient to effect

                                       2

<PAGE>
the conversion of this Debenture.

          3.6.  No further  advances  under this  Debenture  shall be made on or
after the Conversion Date.

     4. Default

          4.1. The entire unpaid and unredeemed  balance of the Principal Amount
and all Interest  accrued and unpaid on this Debenture  shall at the election of
the holder, be and become immediately due and payable upon the occurrence of any
of the following events (a "Default Event"):

          (a) The  non-payment  by the  Corporation  when due of  principal  and
interest or  principal  or interest or of any other  payment as provided in this
Debenture or with respect to any other Debenture issued by the Corporation.

          (b)  A  breach  by  the  Corporation  under  that  certain  investment
Agreement dated January 27, 1999 by and among the Corporation,  Sinclair, and A.
Robert Mancuso (the  "Investment  Agreement"),  or the  Corporation's  breach or
default under any of the Warrants as described in the Investment Agreement.

          (c) If the  Corporation (i) applies for or consents to the appointment
of,  or if there  shall be a taking of  possession  by, a  receiver,  custodian,
trustee or liquidator for the  Corporation or any of its property;  (ii) becomes
generally  unable to pay its debts as they  become  due;  (iii)  makes a general
assignment for the benefit of creditors or becomes  insolvent;  (iv) files or is
served with any  petition for relief  under the  Bankruptcy  Code or any similar
federal or state statute;  (v) has any judgment  entered against it in excess of
Twenty  Five  Thousand  Dollars  ($25,000.00)  in  any  one  instance  or in the
aggregate during any consecutive  twelve (12) month period or has any attachment
or levy made to or against any of its  property or assets;  (vi)  defaults  with
respect to any evidence of  indebtedness or liability for borrowed money, or any
such  indebtedness  shall not be paid as and when due and payable;  or (vii) has
assessed or imposed against it, or if there shall exist, any general or specific
lein for any  federal,  state  or local  taxes  or  charges  against  any of its
property or assets.

          (d) Any  failure  by the  Corporation  to issue and  deliver shares of
Common Stock as provided herein upon conversion of this Debenture.

          4.2.  Each  right,  power  or  remedy  of the  holder  hereof upon the
occurrence of any  Default  Event as  provided  for in this  Debenture or now or
hereafter  existing at law or in equity or by statute  shall be  cumulative  and
concurrent  and  shall be in  addition  to every  other  right,  power or remedy
provided for in this Debenture or now or hereafter  existing at law or in equity
or by statute,  and the  exercise or  beginning of the exercise by the holder or
transferee  hereof of any one or more of Such rights,  powers or remedies  shall
not preclude the  simultaneous  or later exercise by the holder hereof of any or
all such other rights, powers or remedies.

     5. Fair Market Value. The term Fair Market Value as used in this  Debenture
with respect to assets or property received by the Corporation shall be the fair
market value, regardless of

                                       3

<PAGE>
any prior accounting  treatment,  of such assets or property,  determined by the
Board of  Directors  of the  Corporation,  which  determination  shall be final,
conclusive and binding. If the Board of Directors shall be unable to agree as to
such fair  market  value,  the fair  market  value  shall be  determined  by the
independent   certified  public   accountants  at  that  time  retained  by  the
Corporation  to  audit  its  books  and  records,  and a  determination  by such
independent  certified public accountant shall be final,  conclusive and binding
or, if there be none, or if such  accountants  shall refuse or be unable to make
such a determination then the sole issue of fair market value shall be submitted
to and settled by binding arbitration under and pursuant to the Maryland Uniform
Arbitration  Act and the  rules  and  regulations  of the  American  Arbitration
Association,  and the decision or award of the arbitrator or arbitrators in such
arbitration  shall be final,  conclusive and binding and a final judgment may be
entered thereon by any court of competent jurisdiction.

     No  failure  or  delay by the  holder  hereof  to  insist  upon the  strict
performance  of any term of this  Debenture  or to  exercise  any right power or
remedy consequent upon a default hereunder shall constitute a waiver of any such
term or of any such breach,  or preclude the holder hereof from  exercising  any
such Tight  power or remedy at any later  time or times.  By  accepting  payment
after the due date of any amount payable under this Debenture, the holder hereof
shall not be deemed to waive the right either to require payment when due of all
other amounts payable under this Debenture,  or to declare a default for failure
to effect such payment of any such other amount;

     The failure of the holder of this  Debenture  to give notice of any failure
or breach of the Corporation  under this Debenture shall not constitute a waiver
of any right or remedy in  respect of such  continuing  failure or breach or any
subsequent failure or breach.

     6. Consent to Jurisdiction. The Corporation hereby agrees and consents that
any action,  suit or proceeding  arising out of this Debenture may be brought in
any  appropriate  court in the State of Maryland,  including  the United  States
District Court for the District of Maryland,  Northern  Division,  and/or in any
other  court  having  jurisdiction  over  the  subject  matter,  all at the sole
election  of the  holder  hereof,  and by the  issuance  and  execution  of this
Debenture the Corporation  irrevocably consents to the jurisdiction of each such
court. The Corporation hereby irrevocably appoints A. Robert Mancuso as agent of
the  Corporation  to  accept  service  of  process  for  and  on  behalf  of the
Corporation in any action, suit or proceeding arising out of this Debenture.

     7.  Transfer.  This  Debenture  shall be  transferred  on the  books of the
Corporation  only  by the  registered  holder  hereof  or by his  attorney  duly
authorized  in writing or by  delivery  to the  Corporation  of a duly  executed
Assignment  substantially  in  the  form  attached  hereto  as  Exhibit  A  The
corporation  shall be entitled to treat any holder of record of the Debenture as
the holder in fact thereof and shall not be bound to recognize  any equitable or
other claim to or interest in this  Debenture  in the name of any other  person,
whether or not it shall have express or other  notice  thereof save as expressly
provided by the Laws of Texas.

     8. Notices. All notices and communications under this Debenture shall be in
writing  and shall be either  delivered  in  person or  accompanied  by a signed
receipt  therefor or mailed  first-class  United States  certified mail,  return
receipt  requested,  postage  prepaid,  and  addressed  as  follows:  if to  the
Corporation, to Acrodyne Communications, Inc., 516 Township Line Road, Blue

                                       4

<PAGE>
Bell,  Pennsylvania  19422,  Attention  President:  and if to the holder of this
Debenture,  to the  address  of such  holder as it  appears  in the books of the
Corporation.  Any notice of communication  shall be deemed given and received as
of the date of such delivery or mailing.

     9. Governing Law.

     This  Debenture  shall  be  governed  by  and  construed  and  enforced  in
accordance  with the laws of the State of Maryland,  or, where  applicable,  the
laws of the United States.

     IN WITNESS  WHEREOF,  the  Corporation has caused this Debenture to be duly
executed under its corporate seal.

ATTEST:                                ACRODYNE COMMUNICATIONS, INC.

________________________               By:/s/ A. Robert Mancuso     (SEAL)
                                       Name: A. Robert Mancuso
Secretary                              Title: President

This Note is subject to the terms of a  Subordination  Agreement in favor of PNC
Bank, National  Association  Notwithstanding any contrary statement contained in
the within  instrument,  no payment on account of any obligation arising from or
in connection with the within  instrument or any related  agreement  (whether of
principal  interest  or  otherwise)  shall be made,  paid,  received or accepted
except in accordance with the terms of said Subordination Agreement.

                                       5Exhibit 10.8.5

                       SUB-SUBLEASE TERMINATION AGREEMENT

     THIS SUB-SUBLEASE TERMINATION AGREEMENT (the "Agreement"), dated as of
November 8, 1999, by and between RISK CAPITAL REINSURANCE COMPANY
("Sub-Sublandlord"), having an address at 20 Horseneck Lane, Greenwich,
Connecticut 06830, and BANK OF IRELAND ASSET MANAGEMENT (U.S.) LIMITED
("Sub-Subtenant"), having an address at 20 Horseneck Lane, Greenwich,
Connecticut 06830.

                              W I T N E S S E T H:

     WHEREAS, by Sub-Sublease Agreement dated as of April 30, 1997 (the
"Sub-Sublease"), Sub-Sublandlord, as sub-sublessor, sub-subleased to
Sub-Subtenant, as sub-sublessee, certain premises, constituting approximately
6,431 rentable square feet as more particularly described therein (the "BOI
Space"), located in that building commonly known as 20 Horseneck Lane,
Greenwich, Connecticut (the "Building"); and

     WHEREAS, pursuant to discussions between the parties, Sub-Sublandlord
desires to recapture, and Sub-Subtenant desires to relocate from, the BOI Space
prior to the expiration of the Sub-Sublease; and

     WHEREAS, effective as of the Termination Date (as hereinafter defined),
Sub-Sublandlord and Sub-Subtenant desire to terminate the Sub-Sublease and to
end the term thereby demised (the "Term"), and to release each other from their
respective obligations thereafter accruing under the Sub-Sublease, all in
accordance with the terms hereof.

     NOW, THEREFORE, in consideration of the mutual covenants contained herein,
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, Sub-Sublandlord and Sub-Subtenant hereby agree as
follows, notwithstanding anything to the contrary contained in the Sub-Sublease:

     1. General Definitions. Capitalized terms used but not separately defined
in this Agreement shall have their respective meanings used in the Sub-Sublease.

     2. Termination Date; Adjustment; Holdover. The "Termination Date" herein
shall mean midnight on March 31, 2000, except as such Termination Date is
adjusted as hereinafter provided. Sub-Subtenant shall have a single option, to
be exercised upon at least forty-five (45) days prior written notice to
Sub-Sublandlord, to adjust the Termination Date to a later date specified in
such notice; provided, however, in no event shall such adjusted Termination Date
be a date which is greater than fifteen (15) days after such original
Termination Date. Notwithstanding anything to the contrary contained in this
Agreement, to the extent such Termination Date is so adjusted, the term
"Termination Date" as used herein shall mean such adjusted Termination Date. If
Sub-Subtenant retains possession of the BOI Space beyond the Termination Date
without Sub-Sublandlord's prior written consent, such holdover shall not operate
to extend or renew Sub-Subtenant's tenancy, which shall continue only as a
tenancy at sufferance, upon the same terms and conditions then applicable under
the Sub-Sublease,

<PAGE>

except that the Minimum Rent payable by Sub-Subtenant shall be at a rate equal
to 150% of the rate then payable under the Sub-Sublease, prorated on a per diem
basis for the duration of such holdover.

     3. Sub-Sublease Termination. Sub-Sublandlord and Sub-Subtenant hereby agree
that the Sub-Sublease shall terminate and the Term shall expire as of the
Termination Date, with the same force and effect as if the Term were, by the
provisions of the Sub-Sublease, fixed to expire on said Termination Date, except
to the extent of any unperformed obligations theretofore accruing under the
Sublease, as hereinafter provided.

     4. Release; Survival. As of the Termination Date, Sub-Sublandlord and
Sub-Subtenant, respectively, shall be released and discharged from their
respective Sub-Sublease obligations which accrue on and after the Termination
Date. Any unperformed Sub-Sublease obligations of either party with respect to
the BOI Space accruing up to the Termination Date shall survive the Termination
Date, however.

     5. Surrender. On or before the Termination Date, Sub-Subtenant shall
surrender the BOI Space to Sub-Sublandlord in the condition required under the
Sub-Sublease (i.e., in reasonably good order and repair, reasonable wear and
tear and damage by casualty, excepted). Any holdover by Sub-Subtenant without
Sub-Sublandlord's prior written consent shall be subject to the holdover premium
set forth in Section 2 hereof.

     6. Adjustments. As of the Termination Date, the following items shall be
adjusted and apportioned between Sub-Sublandlord and Sub-Subtenant:

     (a)  any due and unpaid, or prepaid, Minimum Rent payable pursuant to the
          Sub-Sublease;

     (b)  increases in Operating Expenses payable pursuant to the Sub- Sublease;

     (c)  increases in Taxes payable pursuant to the Sub-Sublease;

     (d)  electrical service charges payable pursuant to the Sub-Sublease; and

     (e)  any other Additional Rent then due and payable under the Sub-Sublease.

     In the event any of the statements or information necessary to compute the
foregoing adjustments and apportionments have not been, or reasonably cannot be,
determined as of the Termination Date, then the parties' respective obligations
therefor shall be adjusted as soon as is reasonably possible after, and in any
event shall survive, the Termination Date.

     7. Security Deposit. Within thirty (30) days after the Termination Date,
provided Sub-Subtenant is not in default of its obligations under the
Sub-Sublease, Sub-Sublandlord shall return to Sub-Subtenant, the original draft
of Sub-Subtenant's $37,514.16 Letter of Credit, which Letter of Credit was
provided to Sub-Sublandlord as security for Sub-Subtenant's obligations under
the Sub-Sublease. Sub-Sublandlord's obligations under this Section 7 shall
survive the Termination Date.

                                       2
<PAGE>

     8. No Brokerage. Sub-Sublandlord and Sub-Subtenant each hereby represent to
the other that it has not dealt with any broker(s) in connection with this
Agreement. Sub-Sublandlord and Sub-Subtenant hereby agree to indemnify, defend
and hold the other harmless from and against any and all claims, costs, damages
or liabilities (including, without limitation, reasonable attorneys' fees and
costs) for any commissions or other compensation asserted by any broker(s)
caused by the indemnifying party's breach of its representation made in the
immediately preceding sentence. Said indemnities shall survive the Termination
Date.

     9. [Reserved]

     10. Miscellaneous. Each party shall be responsible for their respective
costs and expenses incurred in connection with the negotiation, documentation,
review and execution of this Agreement. As amended hereby, the Sub-Sublease
shall continue in full force and effect, the parties hereby ratifying and
confirming the Sub-Sublease, as amended by this Agreement. In the event of any
conflicts or inconsistencies between the terms of the Sub-Sublease, and the
terms of the Sub-Sublease (as amended by this Agreement), the terms of the
Sub-Sublease (as amended by this Agreement) shall govern and control in each
instance. The Sub-Sublease, as amended hereby, shall not be modified or altered
except by written agreement signed by Sub-Sublandlord and Sub-Subtenant. This
Agreement shall bind and enure to the benefit of Sub-Sublandlord and
Sub-Subtenant, and their respective successors and assigns. Notwithstanding
anything to the contrary contained in this Agreement, this Agreement shall not
be binding on Sub-Sublandlord or Sub-Subtenant, however, unless and until
Sub-Sublandlord and Sub-Subtenant, respectively, shall have executed and
delivered final counterparts of this Agreement to the other. This Agreement may
be executed in individual counterparts, which counterparts, when so executed and
delivered, shall be deemed one and the same counterpart. This Agreement may also
be executed and transmitted via facsimile machine, provided the parties deliver
original, signed Agreement counterparts (or the relevant, original signature
pages) to each other within ten (10) days of such facsimile transmission.

                                       3
<PAGE>

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

                                 SUB-SUBLANDLORD:
                                 RISK CAPITAL REINSURANCE COMPANY

                                 By: /s/ Louis T. Petrillo
                                     -------------------------------------------
                                 Name: Louis T. Petrillo
                                 Title:   Vice President and
                                          Associate General Counsel,
                                 Duly authorized and empowered

                                 SUB-SUBTENANT:
                                 BANK OF IRELAND ASSET MANAGEMENT (U.S.) LIMITED

                                 By: /s/ Rosemary Mahon
                                     -------------------------------------------
                                 Name: Rosemary Mahon
                                 Title: Senior Vice President,
                                 Duly authorized and empowered

                                       4
<PAGE>

STATE OF CONNECTICUT   )
                       ) ss.  GREENWICH
COUNTY OF FAIRFIELD    )

On this 18th day of November, 1999, personally appeared, RISK CAPITAL
REINSURANCE COMPANY, by Louis T. Petrillo, its Vice President and Associate
General Counsel, hereunto duly authorized, who acknowledged that he/she signed,
sealed and delivered the above and foregoing instrument as his/her free act and
deed, and the free act and deed of said corporation, for the purposes therein
stated, before me.
                                            /s/ Lisa M. Morrissey
                                            ------------------------------------
                                            Notary Public
                                            Commissioner of the Superior Court
                                            My Commission Expires: May 31, 2003

STATE OF CONNECTICUT   )
                       )  ss.  GREENWICH
COUNTY OF FAIRFIELD    )

On this 5th day of November, 1999, personally appeared, BANK OF
IRELAND ASSET MANAGEMENT (U.S.) LIMITED, by Rosemary Mahon, its Senior Vice
President, hereunto duly authorized, who acknowledged that he/she signed, sealed
and delivered the above and foregoing instrument as his/her free act and deed,
and the free act and deed of said corporation, for the purposes therein stated,
before me.

                                            /s/ Cathy R. Graves
                                            ------------------------------------
                                            Notary Public
                                            Commissioner of the Superior Court
                                            My Commission Expires: July 31, 2001

                                       5

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