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15-9
Diagnostics Theory
RF_DIAGS
RF Analyzer Loop 1 MHz Reference Detector
This test checks for the presence of the 1 MHz reference.
RF Analyzer Loop Lock Detector
This test checks the loop for lock at several frequencies.
Loop B Output Detector
This test checks the level detector at several frequencies.
Spectrum Analyzer
This test checks the A18 Spectrum Analyzer assembly.
Detector Output
The RF generator is routed externally to the spectrum analyzer through the AUX RF OUT
and AUX RF IN front panel connectors. The level is set to a very low level (-100 dBm),
and the spectrum analyzer detector is measured.
Stepped Gain
The stepped gain amplifiers are check using a 0 dB measurement as a reference. The steps
are then measured one at a time using the detector.
IF Bandwidth
The IF bandwidth is set to all possible values and the voltage is measured by the detector.
Filter Rejection
The LO frequency is set at 10 times the bandwidth away from the center frequency of each
filter, then the detector is read.
Variable Gain IF Amplifier
The variable IF gain amplifier is checked by turning on one bit of the control DAC at a
time, starting with the LSB. The detector is checked as each bit is turned on.
RF Input Signal
With the internal calibration signal disabled, the RF generator and RF analyzer are set to
100 MHz for an IF of 114.3 MHz at the input of the spectrum analyzer. The signal is
routed internally through the coupler on the RF IN/OUT port of the A23 Input assembly
and the level is measured.
Receiver
This test checks the A16 Receiver assembly.