Kenwood TKR-751 Modification Information
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Kenwood TKR-751 Modification Information

Kenwood TKR-751 Modification Information

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Modification Information (MOD)
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Sep, 2005
English
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Summary of Contents for Kenwood TKR-751

  • Page 1 Modification Information (MOD) Version: 1.02 USA Last Updated: Sep, 2005 Language: English Type:...
  • Page 3 Kenwood Corporation does not warrant quality and performance of the software described in this technical document and relevant in-depth manuals to conform to the applicability of any use, and Kenwood Corporation shall be free from liability for any defects, damage or loss, or from any warranty to anything other than expressly described in this technical document and relevant in-depth manuals.

  • Page 4: Table Of Contents

    CONTENTS 1 TERMINAL FUNCTION ......1 8-pin Connector ..........1 15-pin Connector ..........2 25-pin Connector (D-SUB)......3 14-pin Connector (CN601)......4 2 MODIFICATION OF THE ANTENNA ..5 3 INSTALLING THE VOICE SCRAMBLER BOARD ............7 Configuring and Modifying the SC20-460 Board ........7 Installing the SC20-460........

  • Page 6: Terminal Function

    1 TERMINAL FUNCTION This section describes Input/Output terminals of the TKR- can write the configuration data into the TKR-750/850/ 750/850/751/851. 751/851 by connecting it to the PC with the KPG-91D. 8-pin Connector 1 2 3 4 5 6 7 8 The 8-pin connector is located on the front panel of the TKR-750/850/751/851.

  • Page 7: 15-Pin Connector

    1 TERMINAL FUNCTION 15-pin Connector The 15-pin connector is located on the rear panel of the TKR-750/850/751/851 and you can connect external devices, such as an external speaker. Figure 1-2 15-pin connector Table 1-2 Assigning signals to 15-pin connector Pin name Input/Output Description Output...

  • Page 8: 25-Pin Connector (D-Sub)

    1 TERMINAL FUNCTION 25-pin Connector (D-SUB) The 25-pin connector is located on the rear panel of the TKR-750/850/751/851 and you can connect external devices, such as a trunking controller. Figure 1-4 25-pin connector (D-SUB) Table 1-3 Assigning signals to 25-pin connector Pin name Input/Output Description...

  • Page 9: 14-Pin Connector (Cn601)

    14-pin Connector (CN601) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 The 14-pin connector for installing an additional Voice Scrambler board is located in the internal board of the Figure 1-5 14-pin connector (CN601) for installing additional TKR-750/850/751/851, and it can be connected cables of Voice Scrambler Voice Scrambler board (SC20-460/480, etc.).

  • Page 10: Modification Of The Antenna

    2 MODIFICATION OF THE ANTENNA This section describes how to modify the antenna to connect it to the antenna connector for transmission and reception located on the TKR-750/850/751/851. It allows to use as one antenna base by sharing an external antenna connector for both transmitting and receiving.
  • Page 11 You can prevent the degradation of the reception performance caused by the internal antenna switch diode. Order Number: KSG-90/00-50 TX/RX Relay kit Ask KENWOOD System for detailed information about this product. Version: 1.02 USA Modification Information (MOD)

  • Page 12: Installing The Voice Scrambler Board

    De-emphasizing to input into the option board. Therefore, it might be necessary to modify the voice scrambler board. 5. Solder the KENWOOD service parts (E37-0808-05) (Confirm your SC20-460 is enabled de-emphasis.) cables to the SC20-460 board. You must connect the 1-1.
  • Page 13 (GRN) 12 TX OUT (ORN) Figure 3-1 Connecting the SC-20-460 Note: The KENWOOD service parts (E37-0808-05) have a connector allowing you connect it to CN-601 of the TKR- 750/850/751/851. 6. Prepare the cushion having a double-sided adhesive tape. In this case, the cushion tape (No. 4008, No.

  • Page 14: Installing The Sc20-460

    3 INSTALLING THE VOICE SCRAMBLER BOARD Installing the SC20-460 3-2. Remove two connectors (CN600, CN613). Follow the procedures below to install the board into the TKR-750/850/751/851. 1. Remove the front side top panel of the TKR-750/850/ 751/851. Remove 6 screws (N33-3006-45, 3 mm diameter, black) and pull it up.

  • Page 15: Configuration With The Software

    3 INSTALLING THE VOICE SCRAMBLER BOARD Configuration with the Software You can write the Voice Scrambler information to the TX-RX unit (B/2) repeater using the KPG-91D after installing the board. Follow the procedures below to write the Voice Scrambler CN601 data to the repeater.
  • Page 16 3 INSTALLING THE VOICE SCRAMBLER BOARD 6. Configure the “Scrambler Setting” to be enable and 7. Click “Write”. select scrambler code for each channel. You can write the configuration data containing the Voice Scrambler information to the TKR-750/850/751/ 851. Figure 3-4 Channel Information Refer to the “FPRG 6.2.17 Voice Scrambler”...

  • Page 17: Modifying The Dc Power

    4 MODIFYING THE DC POWER It is possible to modify the DC power to prevent the TKR- 750/858/751/851 is turned ON with the erroneous operation of the power switch. With this modification, the DC power is always turned ON regardless of the power switch operation.

  • Page 18: Extracting Rssi Signal From The Acc 25-Pin D-Sub Connector

    5 EXTRACTING RSSI SIGNAL FROM THE ACC 25-PIN D-SUB CONNECTOR It is possible to extract the RSSI signal from the pin 1 of the ACC 25-pin D-Sub connector (Default: No Connection). Follow the procedures below to modify the connector. Note: The part number of the ACC 25-pin D-Sub connector is “E37-0904-05”.

This manual is also suitable for:

Tkr-750Tkr-851Tkr-850

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