TB 9-6625-1959-24
10. Frequency and Harmonics
NOTE
It is not essential that displayed frequency count agrees exactly
with values listed, but it is necessary that harmonic
suppression requirements are satisfied over entire range.
a. Performance Check
.
(1) Connect TI OUTPUT to spectrum analyzer INPUT 50
(2) Position controls as listed in (a) through (f) below:
(a) OUTPUT AMPLITUDE VOLTS P-P control to 5.5.
(b) AMPLITUDE MULTIPLIER switch to Xl.
(c) FREQUENCY RANGE (MHz) switch to 100-250.
(d) FREQUENCY VARIABLE control fully cw.
FREQUENCY MHz
indicator will display 250 MHz or greater.
(e) FREQUENCY VARIABLE control fully ccw.
FREQUENCY MHz
indicator will display 100 MHz or less.
(f) FREQUENCY VARIABLE control for a 250 MHz (high end) display on
FREQUENCY MHz indicator.
(3) Set spectrum analyzer controls as listed in (a) through (e) below:
(a) Preset.
(b) AMPLITUDE, Ref Level to 20 +dBm.
(c) AMPLITUDE, Attenuation to 30 dB.
(d) FREQUENCY, Center Freq, (to TI VARIABLE FREQUENCY control
setting listed in table 4).
(e) SPAN (to spectrum analyzer span setting listed in table 4).
(4) Allow the spectrum analyzer to sweep a few times then set spectrum analyzer as
listed in (a) through (e) below:
Peak Search.
(a)
Marker , Marker CF.
(b)
Marker, Delta.
(c)
(d)
Peak Search.
(e)
(5) The spectrum analyzer Mkr will indicate less than or equal to the minimum
limit listed in table 4. If spectrum analyzer is not less than or equal to the minimum limit
listed in table 4, perform b below.
(7) Set spectrum analyzer marke r to normal by pressing the Marker,
Norma l softkey.