TB 9-6625-2273-50
NOTE
It is important to decrease frequency without going below 295
MHz to ensure that adjustment step is made with highest
frequency filter switched into the circuit.
(9) Adjust spectrum analyzer controls to view 2d harmonic (590 MHz) of TI output signal.
NOTE
When performing adjustments in (10) through (24) below, slide
power module top cover back far enough to enable access to
adjustment.
(10) Adjust R1060 (fig. 1) for minimum amplitude as indicated on spectrum analyzer
display. Amplitude will be ≥ 30 dB below reference point established in (7) above (R).
(11) Adjust spectrum analyzer controls to view 3d harmonic (885 MHz) of the TI
output signal. Amplitude of the signal, as indicated on spectrum analyzer display, will
be ≥ 40 dB below reference point established in (7) above. If not, repeat (9) above and
adjust R5050 (fig. 1) until 2d harmonic amplitude is ≥ 40 dB below reference point
established in (7) above (R).
NOTE
It is important to decrease frequency without going below 145
MHz to ensure that this adjustment step is made with middle
frequency filter switched into the circuit.
(13) Rotate TI control knob to decrease output frequency to 145 MHz.
(14) Press DIGIT SELECT pushbuttons to select 1 MHz resolution as indicated by
TI display.
(15) Adjust spectrum analyzer controls to view 2d harmonic (290 MHz) of TI output
signal. While observing spectrum analyzer display, slowly adjust TI output frequency
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