Operating Instructions For Series VT22 Video/Audio Transmitter

Transcription

1 Operating Instructions For Series VT22 Video/Audio Transmitter Systems Engineering & Management Company 1430 Vantage Court Vista, CA (800)

2 Table of Contents Section Title Page 1.0 Introduction Description System Operation Instructions 2 Illustrations Figure Title Page 1 Series VT22 Video/Audio Transmitter 1 2 Diagram of VT22 Transmitter 2 3 VT22 Connector Interface Diagram 3 4 Video Transmitter Frequency Selection 4 Tables Table Page Title 1 VT22ML Video Transmitter Frequency Switch Settings 5 2 VT22MS Video Transmitter Frequency Switch Settings 8 Appendices Appendix A Series VT22 Video/Audio Transmitter Data Sheet A Appendix B Series VT22 Connector Detail Drawing B i

3 Series VT22 Video/Audio Transmitter Operating Instructions 1.0 INTRODUCTION Congratulations on the purchase of your new SEMCO Series VT22 Transmitter. The model and serial number are located on the label affixed to the front of the unit. WARNING TO PREVENT DAMAGE TO THE UNIT, MAINTAIN THE WARRANTY, AND REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER. REFER ALL SERVICING AND MODIFICATION REQUIREMENTS TO QUALIFIED SEMCO PERSONNEL VIA THE CUSTOMER SERVICE HOTLINE, , EXTENSION DESCRIPTION The Series VT22 Video/Audio Transmitter is a true FM, modular, all solid state unit available either as a fixed frequency or frequency agile microwave transmitter. The transmitter s small size and weight make it ideal for covert body-worn applications. This transmitter operates between either MHz or MHz with a nominal power output of 0.25 watts. The video transmitter is designed to transmit wide-band NTSC video signals (color or black & white). An audio sub-carrier between 5.5 MHz and 7.8 MHz is provided for transmission of audio. These transmitters are FCC Part 90 Type-Accepted, and are designed to be used in conjunction with a wide variety of antennas, including dual patch antenna system. Line of sight range is approximately 0.50 to 0.75 miles. Figure 1 depicts the VT22 Transmitter. 3.0 SYSTEM OPERATION Figure 1 Series VT22 Video/Audio Transmitter 1

4 The VT22 transmitter has two (2) connectors; a 9-Pin Micro-D electrical connector and a SMA RF connector. The 9-Pin connector is provided for Video/Audio/Power In. The SMA connector is provided for RF Output. Refer to Figure 2. SMA RF Connector 9-Pin Micro-D Connector (J1) SEMCO P/N: Note: Mating 9-Pin Connector SEMCO P/N: ITT Cannon: MDM-9PSL Figure 2 Diagram of VT22 Transmitter 3.1 Instructions Step 1 - Step 2 - Attach antenna to the RF OUTPUT (SMA Connector) of the transmitter. Be careful not to over-torque the connectors. Attach mating connector to the 9-Pin Micro-D connector (J1). Figure 3 depicts the connector interface diagram. NOTE: Mating connectors are available directly from the manufacturer or through SEMCO. Two versions are available, one with fly-away leads and one without. - with leads: SEMCO P/N , ITT Cannon P/N MDM-9SCBR - without leads: SEMCO P/N , ITT Cannon P/N MDM-9PSL 2

5 J IN to SW +12 fr SW V Mic VID +12V GND IN MIC PWR VID IN VID GND MIC IN GND GND MIC PWR VID IN MIC IN Camera ELECTRET MIC VIDEO IN POWER IN SWITCH PINS - MIC PWR - VID IN - +12V TO SW - MIC IN - VID GND - GND FROM SW - MIC GND - VID +12 CONNECT GND_IN (4) TO MIC_GND IN WIRE HARNESS Figure 3 VT22 Connector Interface Diagram Step 3 - Frequency Agile Transmitters, Only. Locate and loosen the small screw next to the recessed cover plate on the transmitter housing (see Figure 4). NOTE: Do not remove the screw or cover plate may fall into transmitter housing. Step 4- Step 5 - Slide the recessed cover plate back to expose the frequency select switch. Holding the transmitter as shown in Figure 4 with the transmitter connectors pointing up, enter the proper code starting with position 1 on the extreme left of the 14 pin dip switch. A logic 0 is entered when each switch position is moved up (toward the transmitter connectors). A logic 1 is entered when each switch position is moved down (away from the transmitter connectors). Enter the frequency desired by selecting the corresponding switch position logic as shown in Table 1 or Table 2, as applicable to the transmitter P/N (VT22ML MHz; VT22MS MHz). NOTE: Always use a hard wooden, plastic or metal object when setting the dip switch positions. Never use a soft material (such as a felt tip or pencil lead) in order to avoid introducing foreign material into the transmitter circuitry. Step 6 - Slide the transmitter cover plate back into position and tighten the screw. 3

6 Frequency Select Switch Open Orientation Frequency Select Switch Closed Figure 4 Video Transmitter Frequency Selection 4

7 Table 1 VT22ML Video Transmitter Frequency Switch Settings VT22ML Frequency Chart FREQUENCY BINARY FREQUENCY BINARY

8 VT22ML Frequency Chart FREQUENCY BINARY FREQUENCY BINARY

9 VT22ML Frequency Chart FREQUENCY BINARY FREQUENCY BINARY

10 Table 2 VT22MS Video Transmitter Frequency Switch Settings VT22MS Frequency Chart FREQUENCY BINARY FREQUENCY BINARY VT22MS Frequency Chart FREQUENCY BINARY FREQUENCY BINARY

11

12 VT22MS Frequency Chart FREQUENCY BINARY FREQUENCY BINARY

13 Appendix A Series VT 22 Data Sheet A

14 B