Rosen Entertainment Systems LLC 8/30/2005 Rosen Entertainment Systems Wireless FM Transmitter Part# 9100458 User Guide Rosen FMT.
Rosen Entertainment Systems LLC 8/30/2005 Table of contents Table of contents......................................................................... 2 General Description ..................................................................... 3 Architectural Overview ................................................................. 3 Block Diagram ............................................................................ 4 Operating Guide .................................................................
Rosen Entertainment Systems LLC 8/30/2005 General Description Rosen’s FMT module, part# 9100458 is a 12-channel FM transmitter designed to transmit audio signals over the FM frequency band to enable users to listen to audio from an independent video system over the existing car audio system via the radio. Architectural Overview The FMT transmitter is designed around the BH1417 from Rohm. Refer to the datasheet for details on this part.
Rosen Entertainment Systems LLC 8/30/2005 Block Diagram The block diagram below shows the main components of the FMT module and how they are interconnected. BH1417F Stereo TDM 19KHz VCO X1 7.60MHz Pre-Scalar AMP Pre-Scalar Divide Ratio Counter Antenna Rosen FMT.
Rosen Entertainment Systems LLC 8/30/2005 Operating Guide Using the supplied interface board you are able to test the operation of the FMT. To test your FMT setup as follows: Connect the interface board to the FMT using the supplied 9-pin harness. Connect the power wires on the interface board to a voltage supply between 4.8 & 5.2V DC. The red wire should connect to +ve and black should connect to Gnd. Connect a stereo audio source with a maximum 1V RMS signal to Audio_R and Audio_L connectors.
Rosen Entertainment Systems LLC 8/30/2005 Interface / Pinout Definition All control and audio is interfaced via a single connector JP1. It is intended to connect to a control board allowing firmware to control the channels selection as well as the power.
Rosen Entertainment Systems LLC 8/30/2005 Appendix 1: Frequency Table The frequency table below shows the value of the 74HC161 counter as well as the corresponding FM transmission frequency 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: 13: 14: 15: 88.1 MHz 88.3 MHz 88.5 MHz 88.7 MHz 88.9 MHz < no setting > 106.7 MHz 106.9 MHz 107.1 MHz 107.3 MHz 107.5 MHz 107.7 MHz 107.9 MHz { 7 is a meaningless value } { 15 in a meaningless value } Rosen FMT.
Rosen Entertainment Systems LLC 8/30/2005 Appendix 2: Sample Code The sample code below is used to communicate to the FMT using a PIC micro controller, when using this method in conjunction with outputting information on a video screen a user is able to see visually on screen the status of the FMT.
Rosen Entertainment Systems LLC 8/30/2005 // do the following for each increment of the station // example: the following 3 lines should be done 3 times to set 88.3 SEL2_A = 0; < delay 2 microseconds > SEL2_A = 1; // store new station in EEPROM Rosen FMT.
Rosen Entertainment Systems LLC 8/30/2005 Appendix 3: Schematic Diagram +5VA +5V S1 1 JP1 2 3 1 1 C2 100uF/16V -6dB AYZ0102AGRL 2 C3 .01uF 2 1 2 3 4 5 6 7 8 9 ITT Cannon Slide Switch 31 2 R14 3.3K HEADER 9 1 1 2 1 4.7K R4 22K R12 10K RA 1 2 1 2 1uF/10V C6 3300pF C12 1 2 2 2 R7 4.7K 1 2 1 1 R6 4.7K 2 1 C4 C5 3300pF Q1 MBT4401 2 R3 22K 2 1 R9 2 LA 1uF/10V 1 1 1 2 C17 .
Rosen Entertainment Systems LLC 8/30/2005 Appendix 4: Specifications Operation power supply voltage Transmission Frequency Operating Temperature Dimensions 4.8 ~ 5.2 V DC 88.1 ~ 88.9Mhz, 106.7 ~ 107.9 Mhz. Step 200Khz 0 ~ 60° C 70mm x 34mm x 11mm Rosen FMT.
