2-21
7) Enter Cal menu by pushing “Shift + 0” keys. Enter Pre-selector Tuning menu with “F6” key.
8) Press “F2” key and set Pre-selector bias value to 0, using the data keys or the knob on the front panel.
9) Adjust the variable resistor R31 on A13 MICRO CONVERTER (refer to Fig. 2-2-6) to make displayed signal
level maximum.
10) Put the screw of the variable resistor R68 on A13 MICRO CONVERTER (refer to Fig. 2-2-6) center in its rotation
range.
(5) YTO main sweep adjustment
Initialize the spectrum analyzer and the 6769B.
1) Set the spectrum analyzer to :
Center frequency, 1.5 GHz
Span, 3 GHz
Set the 6769B output to :
RF LEVEL, -10 dBm
Frequency, 1.5 GHz (CW)
Press “→CF” key of the spectrum analyzer.
2) Set the 6769B output frequency to 300 MHz.
On the spectrum analyzer, press “Peak Search” key, and set the marker function to delta marker mode (Press
“Marker” key and press “F2” key).
3) Set the 6769B output frequency to 2.7 GHz.
On the spectrum analyzer, press “Peak Search” key, and read the frequency difference between 300 MHz input
and 2.7 GHz input.
4) Adjust the variable resistor R57 on 3GHz CONVERTER (refer to Fig. 2-2-5) until the reading of frequency
difference becomes 2.4 GHz ±6 MHz, to repeat the procedure 2), 3).
5) Initialize the spectrum analyzer (Press “Preset” key and press “F1” key).
Set the 6769B to :
Frequency, 14.2 GHz (CW)
RF LEVEL, -20 dBm
6) Set Pre-selector bias value to 0, according to above-mentioned procedure.
7) Press “Peak Search” key to place marker indicator on the top of 14.2 GHz signal.
8) Adjust the variable resistors R63 and R64 on A13 MICRO CONVERTER (refer to Fig. 2-2-6) to make the signal
level maximum, i.e. increase the level roughly with R63, and then using R64, make it exactly maximum.
2.2 Troubleshooting
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