8.21.4 MHz Bandwidth Filter Adjustments

33.Key in t-1 100 kHz, C-1 200 kHz, and MARKER

[PEAK SEARCH].

34.Adjust A4A8R35 LC to align makers on display. MARKER A level should indicate 1.00 X. See Figure 3-43 for location of adjustment.

35.Repeat steps 31 through 34 until no further adjustment is necessary.

A4A8 XTAL Adjustments

36.Key in @TFTiTj 30 kHz, [FREQUENCY SPAN] 100 kHz. Press

MARKER IOFF).

37.Connect crystal filter bypass network between A4A8TPl and A4A8TP2.

38.Press (REFERENCE LEVEL) and adjust DATA knob to place signal peak two division from the top graticule line.

39.Adjust A4ASC44 CTR to center signal on center graticule line. Adjust A4A8C42 SYM for best symmetry of signal. See Figure 3-44 for location of adjustments. If unable to adjust A4A8C42 SYM

for satisfactory signal symmetry, increase or decrease value of A4A8C43. Refer to Table 3-3 for range of values.

A4A8

A t t e n u a t o r - B a n d w i d t h F i l t e r

A4A8

Figure 3-44.

Location of A4A8 21.4 MHz Crystal Filter Adjustments

40.Remove crystal filter bypass network from between A4A8TPl and A4A8TP2.

41.Adjust A4A8C29 CTR to center signal on center graticule line. Adjust A4A8C13 SYM for best symmetry of signal. See Figure 3-44 for location of adjustments. If unable to adjust A4ABC13 SYM

for satisfactory signal symmetry, increase or decrease value of A4A8C14. Refer to Table 3-3 for range of values.

42.Press MARKER CPEAK SEARCH) and MARKER @

43.Key in [FREQUENCY SPAN] 10 kHz.

44.Key in [REsBW) 3 kHz and MARKER CPEAK SEARCH).

Adjustments 3-81