Table of Contents
Advertisement
Rosen Entertainment Systems LLC
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. The module runs off a 5VDC
supply, left and right audio signals should be at 1V RMS to achieve
maximum volume.
A 74HC161 counter is used to control the channel selection of the FM
transmitter. The interface to the counter is accomplished by way of a
3-wire communication bus consisting of CLOCK, CLEAR and GROUND
lines. A 5V pulse on the CLOCK line will step to the next channel. A 5V
pulse on the CLEAR line will reset back to the default channel.
FM transmission can be switched on and off by applying and removing
the 5VDC supply to the module itself.
Notice : The changes or modifications not expressly approved by the party
responsible for compliance could void the user's authority to operate the
equipment.
THIS DEVICE COMPLIES WITH PART 15 OF THE FCCRULES. OPERATIONS IS
SUBJECT TO THE FOLLOWING TWO CONDITIONS: ( 1 ) THIS DEVICE MAY
NOT CAUSE HARMFUL INTERFERENCE AND ( 2 ) THIS DEVICE MUST
ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFEERENCE
THAT MAY CAUSE UNDESRIED OPERATION
Rosen FMT. Part # 9100458
8/30/2005
Advertisement
Table of Contents
