DRAFT D
TNM-M-E-0001 Page 23
3.6.2 Power Supplies
The following is a list of the SRM9000 power supplies and some of the devices and circuits they
supply.
3.6.2.1 +8V Regulator U310
Regulated +8.0V supply (8V0 and +8V)
• TX buffer Q612
• VCOs and VCO buffers via active filter Q615
• RX second local oscillator via Q403
Regulated +8.0V switched supply (RX PSU)
• RX front end
• IF Amplifier
• Various switching functions
3.6.2.2 +5V Regulator U311
Regulated +5.0V supply (5V0 and +5V)
• RX front end varactor positive bias
• Synth. buffer Q607
• VCO varactor negative supply Q700 to Q703
• TCXO U700
• RX audio amplifiers U803A/B
• RX mute switch Q810/813
• Multiplexer U902
• FE TUNE level translator and buffer U901A, Q900/901
Regulated +5.0V switched supply (TX PSU and TX PSU+)
• TX power control U3
• TX buffer Q606
• Microphone amplifier Q812
• Various switching functions
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