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MX920 Base Station & Repeater
A dual directional coupler consists of coupled microstrip transmission lines fabricated
on the PCB artwork. The sampled RF energy is rectified to provide a proportional DC
voltage output.
The PTT signal enables the amplifier circuit by providing bias to the transistors. A
thermistor TS I, physically located on the PA heatsink monitors the heatsink's
temperature and is monitored by the Micro Controller.
Technical Manual
2003 Revision
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