8. 21.4 MHz Bandwidth Filter Adjustments
for satisfactory signal symmetry, increase or decrease value of
Refer to
3-3 for range of values.
All crystal filter bypass networks are removed. Signal should be
centered and symmetrical. If not, go back to step 14 and repeat
adjustments.
Press MARKER
[
PEAK SEARCH
)
and MARKER
Key in
(
FREQUENCY SPAN
)
20
3
and MARKER
SEARCH).
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
Adjust
XTAL to align markers on display. MARKER
A level should indicate 1.00 X. See Figure 3-42 for location of
adjustment.
Disconnect cable 97 (white/violet) from
and reconnect
cable to
Reconnect cable 89 (gray/white) to
Key in
100
and
(
FREQUENCY SPAN
]
200
Press
LEVEL
_)
and adjust DATA knob to place signal peak
approximately two divisions down from the top graticule line.
Adjust
LC CTR and
LC CTR for maximum
MARKER level as indicated by CRT annotation. See Figure 3-43
for location of adjustments. If unable to adjust
and
LC CTR adjustments for satisfactory signal amplitude,
increase or decrease value of
and
Refer to
3-3 for range of values.
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
Figure 3-43.
Location of
21.4
LC Filter and Attenuation
Adjustments
Key in
1 MHz and
2 MHz, MARKER
(
PEAK SEARCH
]
and MARKER la].
Key in
100
200
and MARKER
SEARCH].
Adjustments
