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ADJUSTMENTS

MODEL

8559A

ADJUSTMENTS

27. THIRD CONVERTER ADJUSTMENTS (Cont'd)

Adjust function generator amplitude and frequency for at least 10 MHz deviation

5 MHz) and an easy-

view display on the 8569B spectrum analyzer. Refer to Figure 5-15. Increasing the frequency of the

function generator will increase the swept frequency range of the sweep oscillator.

Adjust second IF

bandpass filter adjustments A10C9 through A10C12 for the flattest bandpass response

possible at the greatest amplitude possible centered at 21.4 MHz and at least 6 MHz (6 divisions) wide at 1

dB down from the highest point on the response curve. Do not sacrifice large amounts of amplitude for

flatness. Some early instruments may display ripple on the response. This ripple should be

1 dB peak-to-

peak. Peak of adjusted response should be at

10 dBm

2 dB.

NOTE

The output level of the third converter is actually

0 dBm. Due to the mis

match error (~9.5 dB) encountered in this measurement, the level measured

will be approximately

dBm.

Refer to Figure 5-15 for example of properly adjusted bandpass response and requirements for response.

21.4

MHz

FIGURE

5-15,

SECOND IF BANDPASS FILTER RESPONSE

HP 8559A User Manual

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