TB 9-6625-2333-35
(41) Press TI MARKER PEAK SEARCH key then [MARKER DELTA] key.
(42) Press synthesizer/level generator INCR ⇑ key.
(43) Press TI INSTRUMENT STATE SGL SWP key and wait for completion
of new sweep.
(44) Press TI MARKER MKR key. Adjust TI knob ccw until ∆ MKR indicates 0 dB
0.5 dB. The marker should be on the left-hand skirt of the signal. If the marker cannot be
set exactly to 0 dB, note whether the marker is just above or just below the actual -60 dB
point.
(45) Press TI [DELTA MARKER] key. Adjust TI knob cw until ∆ MKR indicates 0
dB 0.5 dB. The active marker should be on the right-hand skirt of the signal. If the marker
was just above the -60 dB point in (44) above, set the marker just below the -60 dB point. If
the marker was just below the -60 dB point in (44) above, set the marker just above the -60
dB point.
(47) Press TI MARKER PEAK SEARCH key. Record TI ∆ MKR frequency
indication as the actual span in table 6 for the current TI RES BW setting.
(48) Calculate corrected -60 dB bandwidth using formula below and record the result
in table 6 for the current TI RES BW setting.
Corrected -60 dB BW = (Actual Span/Ideal Span) x Measured -60 dB BW
Example: RES BW setting = 1 MHz
Ideal Span = 16 MHz
Actual Span = 17 MHz
Measured -60 dB BW = 9.82 MHz
Corrected -60 dB BW = (17/16) x 9.82 MHz = 10.43 MHz
(49) Calculate selectivity by dividing the corrected -60 dB bandwidth by the corrected
-3 dB bandwidth (from table 4) for the current TI RES BW setting. The result will be <15.
Selectivity = corrected -60 dB BW / corrected -3 dB BW
Example: Selectivity = 10.43 MHz / 0.9415 MHz = 11.08
(50) Press TI keys as listed in (a) through (d) below:
(a)
MARKER MKR.
(b)
[MARKERS OFF].
(c)
CONTROL TRIG.
(d)
[SWEEP CONT SGL] to select CONT.
(51) Repeat technique of (27)(a), (b), and (29) through (50) above for remaining TI
b. Adjustments. No adjustments can be made.
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