168 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Front End Control Troubleshooting
A15 Front End Control Description
A15 Front End Control Description
Purpose
The A15 Front End Controller board functionality can be broken down into (3)
main categories
1. Provides switch control logic and bias voltages to the major RF front end
assemblies in the N9040B Signal Analyzer.
2. Contains on board circuitry providing various signal outputs to other
locations within the analyzer.
3. Provides control logic for various instrument options within the analyzer.
These signals are routed to and from the A15 via ribbon cables, wiring
harnesses and coaxial cables. The RF front end assemblies require the correct
control logic and bias in order to function properly. If the voltages from the A15
are not correct, the RF input signals will most likely be displayed at an incorrect
power level if they even get displayed at all.
Standard RF Assemblies Controlled by the A15:
— A9 Input Attenuator A (4 dB total for Opt 508, 513, 526)
— A10 Input Attenuator B (66 dB total for Opt 508, 513, 526)
— A11 Low Band Switch
— A12 YIG Tuned Filter
— A13 RF Front End Assembly
A15 On Board Circuits:
— RF Burst Trigger (When set to Relative Trigger or when start frequency is
> 300 MHz.)
— Switched IF Filter Control
— 1st L.O. Optimization
— YTF Tune Ramp
— Preselector Tune Out (Provides output voltage, not specified, reserved for
future use)
—Mixer Bias
—Amplifier Bias
—Switch Control
— Sweep Ramp (reserved for future use)
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