Analog Continuous Wave (Cw) Doppler Tests - GE LOGIQ E9 Service Manual

PROPRIETARY TO GE
D 5180483-100, R . 7 LOGIQ E9 P S M
IRECTION EV ROPRIETARY ERVICE ANUAL
7-5-12-10 Analog CW

Analog Continuous Wave (CW) Doppler Tests.

Under Service Diagnostics / Analog CW.
INPUT > a sine wave generated on the GFI test vector generator and injected on the GRX board(-s).
OUTPUT > The signal passes through the analog Doppler circuitry of the GRX board and into the GFI.
Figure 7-59 Analog Continuous Wave (CW) Doppler Tests
The test input signal is a sine wave generated on the GFI test vector generator (TVG) and injected on
the GRX board (-s). The setup of the analog Doppler is done through a 512-bit setup word. The output
signal from the GRX will depend on the Doppler setup. For example the frequency will be determined
by the frequency of the signal in and the Mixer clock setup.
The signal passes through the analog Doppler circuitry of the GRX board and into the GFI. The GFE is
setup to receive CW data and the GFI processing in bypass mode.
The level is adjusted with the TSIG_GAIN and IQ_GAIN parameters to avoid saturation through the
GRX Doppler circuit.
Chapter 7 Diagnostics/Troubleshooting 7 - 77