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User's Manual

ManualsBrandsIP Mobilenet ManualsElectronics700/800 MHz 32k Fixed Radio
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F32700N25.doc Page 10
Voltage regulator U6 powers the transmit driver and T/R switch diodes as
controlled by the microcontroller.
Voltage regulator VR4 provides a low noise 3.3-volt source for the radio
electronics.
Voltage regulator VR3 provides a low noise 5-volt source for the front end
amplifiers (U4 and U7) , mixer (U8) and Receive audio OP amp (U9).