TB 9-6625-2323-24
(25) Reduce TI output to minimum.
(26) Disconnect TI from measuring receiver.
b. Adjustments. No adjustments can be made.
11. Spectral Purity
a. Performance Check
(1) Connect equipment as shown in figure 3.
Figure 3. Spectral purity hook-up.
(2) Press TI keys as listed in (a) through (e) below.
(a) System, Reset.
(b) Output On Off to off.
(c) Level Control, L1, Edit L1, 3, and MHz ms dB.
(d) Frequency Control, F0, Edit F0, 1, 0, and MHz ms dB.
(e) Output On Off to on.
(3) Set the spectrum analyzer controls as listed in (a) through (e) below.
(a) Span X Scale to 1, 0, MHz.
(b) FREQUENCY Channel, Center Frequency to 1, 0, MHz.
(c) BW/Avg, Res BW to 1, MHz.
(d) Sweep, Sweep Time to Auto.
(e) Amplitude Y Scale, Ref Level, 1, 0, dBm.
(4) On the spectrum analyzer measure the worst case harmonic and non-harmonic
signals for the frequencies listed in table 11 and verify that TI is less than or equal to the
maximum indications listed.
