54 Chapter2
Making Adjustments
5. Crystal and LC Bandwidth Filter
26.Adjust A13C45 LC CTR for maximum signal at center-screen.
27.Move the short from A11TP10 and A11TP11 to A11TP12 and
A11TP13, then adjust A11C23 LC CTR for maximum signal at
center-screen.
28.Move the short from A13TP12 and A13TP13 to A11TP10 and
A11TP11, then adjust A13C45 LC CTR for maximum signal at
center-screen.
29.Move the short from A13TP10 and A13TP11 to A13TP12 and
A13TP13, then adjust A13C23 LC CTR for maximum signal at
center-screen.
30.Disconnect all the shorts from A11 and A13 bandwidth board
assemblies.
LC Amplitude
31.Press the following analyzer keys.
BW, 3, MHz
SPAN, 2, MHz
32.Press AMPLITUDE and adjust the signal level one division below the
top graticule using the knob.
33.Press the following analyzer keys.
PEAK SEARCH, MARKER ∆
MKR FCTN, MK TRACK ON OFF (ON)
BW, 100, kHz
It may be necessary to occasionally recenter the 30 kHz bandwidth.
34.Adjust A11R26 LC and A13R26 LC equally for a MARKER ∆
amplitude of 0 dB. Each potentiometer should be adjusted to
accomplish one-half of the necessary increase in signal amplitude. If
A11R26 or A13R26 reaches its limit, recenter both potentiometers
and repeat step 31 to step 35.
35.Press
MKR FCTN, MK TRACK ON OFF (OFF) on the analyzer.
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