**Exhibit 4.50**

** **

**FOIA CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION IN THIS AGREEMENT. THIS INFORMATION HAS BEEN REDACTED AND DENOTED BY ASTERISKS [***].**

 

 

**TWENTY-THIRD AMENDMENT TO**

**AGREEMENT 319-I**

 

THIS TWENTY-THIRD AMENDMENT TO AGREEMENT NUMBER 319-I IS ENTERED INTO THIS 15 DAY OF SEPTEMBER, 2012 (THE “EXECUTION DATE”), BY AND BETWEEN **HUGHES NETWORK SYSTEMS, LLC**, A LIMITED LIABILITY COMPANY ORGANIZED AND EXISTING UNDER THE LAWS OF THE STATE OF DELAWARE WHICH SHALL HEREINAFTER BE REFERED AS THE**“CLIENT”**, SUCCESSOR IN INTEREST TO **HUGHES NETWORK SYSTEMS,** A DIVISION OF **HUGHES ELECTRONICS CORPORATION,** AND AS THE OTHER PARTY **SATELITES MEXICANOS, S.A. DE C.V.**, WHICH SHALL HEREINAFTER BE REFERED AS **“SATMEX”**, A CORPORATION ORGANIZED AND EXISTING UNDER THE LAWS OF MEXICO (TOGETHER REFERRED AS THE “PARTIES”) PURSUANT TO THE FOLLOWING:

 

**W I T N E S S E T H**

 

**WHEREAS**, on January 20, 2000, **SATMEX** and **HUGHES ELECTRONICS CORPORATION**, through the**CLIENT**, executed the agreement number 319-I, hereinafter the “Agreement”;

 

**WHEREAS**, up to the Execution Date, the Parties have executed twenty two Amendments to the Agreement in order to modify the terms and conditions of the satellite capacity provided by **SATMEX**to the **CLIENT**.

 

**NOW THEREFORE**, in consideration of the foregoing and mutual covenants contained in this Twenty-Third Amendment, the Parties agree as follows:

 

**A G R E E M E N T**

 

**FIRST. **The Parties accept and recognize that the satellite capacity is modified in accordance with the following schedule:

 

a)             On [***], the Parties agreed to [***] the satellite capacity commitment using [***] capacity with a total monthly payment of **USD****$**[***].

 

b)             The Parties agree to [***] the satellite capacity commitment, commencing on [***], in order to result in the use of [***] capacity. Pursuant this [***], the monthly fee per MHz will be [***] to the amount of USD $[***]; therefore, the total monthly payment for the capacity commitment is for the amount of **USD****$**[***].

 

Moreover, the transponders related to the [***] and the [***] are as follow:

 

**FIXED CAPACITY**

 
| **Satellite** | ** ** | **Band   Region** | ** ** | **Txdr** | ** ** | **Bandwith   MHz** | ** ** | **Term** |
|---------------|------------|-------------------|------------|----------|------------|--------------------|------------|----------|
| Satmex   6    |       | [***]             |       | [***]    |       | [***]              |       | [***]    |
|          | [***]      |              | [***]      |     | [***]      |

 

**CAPACITY COMMITMENT**

 
| **Satellite** | ** ** | **Band** | ** ** | **Txdr** | ** ** | **Bandwith**

**MHz** | ** ** | **Term** |
|---------------|------------|----------|------------|----------|------------|-----------------------|------------|----------|
| Satmex 5      |       | [***]    |       | [***]    |       | [***]                 |       | [***]    |
| Satmex 6      |       | [***]    |       | [***]    |       | [***]                 |       |

 

**SECOND.** The Parties agree that the term of this Twenty-Third Amendment commence from the Execution Date and shall terminate in accordance with the terms and conditions set forth in the Seventeenth Amendment.

 

**THIRD.**All notices to be provided under the Amendments and/or the Agreement shall be in accordance with the terms and conditions set forth in the Seventeenth Amendment.

 

CONFIDENTIAL

 

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**FOIA CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION IN THIS AGREEMENT. THIS INFORMATION HAS BEEN REDACTED AND DENOTED BY ASTERISKS [***].**

 

**FOURTH****.**This Amendment, the underlying commercial relationship between the Parties, and all collateral matters relating thereto, shall be governed by, and construed in accordance with Section 33 of the Agreement.

 

**FIFTH.**Except as specifically amended hereby, the terms and conditions of the Agreement and its past Amendments, shall remain in full force and effect in accordance with its terms.

 

This Twenty-Third Amendment is signed in counterparts, one copy remaining in possession of each Party, as of the Execution Date first written above.

 
| FOR THE**CLIENT   HUGHES NETWORK SYSTEMS**  |   | FOR **SATMEX   SATÉLITES MEXICANOS, S.A. DE C.V.** |
|---------------------------------------------|--------|---------------------------------------------------------|
|                                        |   |                                                    |
|                                        |   |                                                    |
| /s/ Philip K.   O’Brien                |   | /s/ Patricio E.   Northland                             |
| **PHILIP K. O’BRIEN   VICE PRESIDENT** |   | **PATRICIO E. NORTHLAND   GENERAL DIRECTOR**            |

 

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