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17
Theory of Operation
fm audio Processor Subtone Inputs
There are two subtone inputs available on the FM Audio Processor. Both subtone inputs can be
individually configured to be output from the standard Modulation Output port or to be output from
the Low Frequency / Direct Modulation Output. In standard configuration, Subtone 1 is summed with
the voice signals to be output from the standard Modulation Output port while Subtone 2 is used for
DCS. Both subtone inputs have an input level control.
In order to maintain a uniform frequency response from 50 Hz to 300 Hz, dual-port modulation
techniques are used. Refer to the schematic diagrams and alignment procedures included in this
manual.
direct modulation Input
The Direct Modulation Input is an extremely versatile input. This port is designed to be used for data
signals. Depending on the application, the signal can be amplified, AC or DC coupled and output
to the Modulation Output or the Low Frequency / Direct Modulation Output port. Please consult the
factory for specific jumper settings for your application.
MT-3 FM Transmitter Mainboard Instruction Manual
IM20-MT3TXMN
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