Related Manuals for Broadcast MT100-E
Summary of Contents for Broadcast MT100-E
-
Page 1: Owners Manual
OWNERS MANUAL Model MT100 (-E & -U) 100 WATT FM STEREO TRANSMITTER RFCAST – MT100. Rev. 2: 06-12-04 1/16... - Page 2 USER NOTICES IT IS VERY IMPORTANT TO READ THE FOLLOWING MANUAL SECTIONS PRIOR TO OPERATION OF THIS TRANSMITTER! Notice 1 The transmitter main operating voltage setting is marked on the rear of the MT100 chassis. It may be necessary to change this setting for your operating condition. Please refer to AC Main Voltage Setting in section 6.0 Set Up Procedure.
- Page 3 ELECTRONIC FILES OF THE SCHEMATIC DIAGRAMS IN THIS MANUAL ARE AVAILABLE. SHOULD A LARGER MORE VIEWABLE VERSION OF ANY DIAGRAM BE REQUIRED NOTIFY RICHARDSON ELECTRONICS, LTD. TO CALL OUR TECHNICAL SUPPORT CENTER OR FOR OTHER CUSTOMER SERVICE ISSUES AT RICHARDSON ELECTRONICS IN LA FOX, ILLINOIS REFER TO THE FOLLOWING NUMBERS: TECHNICAL SUPPORT: 630-208-2790 CUSTOMER SERVICE: 630-208-2304...
- Page 4 Technical Support Should you need technical assistance or trouble shooting guidance contact Broadcast Richardson in your local area or you can reach assistance from Broadcast Richardson in La Fox, Illinois at telephone +1 (630) 208-2782, Fax +1 (630) 208-2551 or Customer Service at +1 630-208-2304.
- Page 5 The installation, operation, and maintenance of this equipment involves risks to personnel and also to the equipment. Broadcast Richardson or Richardson Electronics, Ltd. shall not be responsible for injury or damage that is the result of improper procedures or use by persons improperly trained or lacking the knowledge to perform associated tasks.
-
Page 6: Table Of Contents
Table of Contents User Notices page 2 Returns & Exchanges page 4 Unpacking page 4 Technical Support page 4 Warning page 5 Table of Contents page 6 MT100 Datasheet with Picture Overview page 8 MT100 Basic Block Diagram page 8 Subassemblies Description Page 8 MT100 AC/DC Power Supply... - Page 7 Schematic Diagrams and Components Locations 14.0 OME-1T Schematic Diagram 15.0 MT100 Amplifier Schematic 16.0 MT100 RF Board Layout 17.0 MT100 Logic Control Board Layout 18.0 Logic Control Board MT100 Schematic 19.0 MT100 Low Pass Filter Layout 20.0 MT100 GR00175 – 250W Low Pass Filter Schematic 21.0 100W Directional Coupler Layout 22.0...
-
Page 8: Overview
MT100 STEREO LOW POWER FM TRANSMITTER 100 WATT 1.0 OVERVIEW MT100 is a 100 Watt FM Low Power Transmitter. It is very simple and easy to use. It is composed of a mechanical frame (19 inches std., 3 RU high and 500mm depth), an exciter (OME-1T), a RF section, which comprises a RF control board and an amplifier section, a directional coupler and a low pass filter, a display, a power supply with a AC/DC converter and a DC/DC converter. -
Page 9: Mt100 Dc/Dc Power Supply
Input 110 Vac or 220 +/- 15% (manually switched) Output 28 to 30 Vdc I max 10 A operating; 15 A short circuit Efficiency 85% typ. Isolation 4 KV (In/out or In/GND) Weight (Typ.) 1500 g Size (WxHxD) 120x80x200 MT100 DC/DC Power Supply The MT100 uses a DC/DC converter. -
Page 10: Mt100 Rf Amplifier
RF Protection. A fast comparator switches when the output detected reflected power exceeds a pre-set threshold. The regulation of this threshold is made by RT2 trimmer, adjusted in factory for a value of 20 Watts. When the protection is switched on, the protection circuitry removes the RF signal applied to the final stage amplifier very quickly, in about 1 microsecond. -
Page 11: Low Pass Filter And Directional Coupler
Frequency range FM ( 87.5-108 MHz ) Gain > 16 dB typ. Output Power > 5 W The final stage is an amplifier stage for FM signal operating in band II (87.5 – 108 MHz), with nominal output power of 100 Watts CW. Normally, the amplifier operates up to 150 Watts in order to overcome the Insertion loss of the circuitry that follows the amplifiers, being the 2 Way Combiner, Directional couplers, and Low Pass Filter. -
Page 12: Mt100 Technical Specifications
The directional coupler is a block composed by 2 directional couplers and a quarter wave delay line. Both ports of each directional coupler are used. Two of them detect the reflected power, one detects the FWD power and one is used as RF monitor. The function of the delay line is to have two reflected power signals detected at 90°... - Page 13 Power Factor: > 0.9 R & Mono Input Input connectors: BNC female (front panel) Input Impedance: 1.0 M ohm resistive, unbalanced, source impedance <10kOhm Input level (For +/-75KHz deviation): 3 to 9 dBm/600Ω Frequency response (30Hz to 15KHz): +/- 0.15dB Pre-emphasis: Flat/50µSec/75µSec +/-3% THD (30Hz to 15KHZ):...
-
Page 14: Set Up Procedure
THD on Encoded Channels (30Hz to < 0.1% 15KHz): Audio Response (30Hz to 15KHz): +/- 0.25dB Nominal Pilot Deviation: +/- 7KHz Pilot Output level: 1 Vpp, square wave SCA/RDS & AUX input Input connectors: BNC type female (front panel) Input Impedance: 5KΩ... - Page 15 In order to change the AC operating voltage it is necessary to change the switch inside the transmitter on the front of the power supply. Sliding this switch right or left makes the selection for 110 or 220 VAC operation. To access the power supply switch you will need to remove the top cover of the MT100 or the switch may also be accessed through the transmitter front panel by removing the four (4) corner screws on the front of the OME-1T stereo exciter then sliding it forward out of the way.
- Page 16 Turning On the transmitter After the above procedures, it is possible to turn the transmitter on. On the front panel, the mains LED indicates the status of the MT100. If it is on, the equipment has been correctly supplied. By activating the “enable” switch on the front panel, the transmitter will energize to the maximum power that has been set.