TB 9-6625-1959-24
b. Adjustments. Tuning slugs (coils) associated with FREQUENCY RANGE (MHz)
50-100, 25-50, 10-25, 5-10, and 2.5-5 switch settings are adjustable for overlapping of
frequencies and harmonic suppression. Adjustment of tuning slugs will affect both
frequency and harmonic suppression. If a tuning slug is adjusted to suppress harmonics, it
may be necessary to readjust to maintain both frequency overlapping and harmonic
suppression. No tuning slug should be adjusted for more than marginal deviations in
frequency range or harmonic suppression. Generation of large harmonic amplitudes or
large deviations in tuning range, listed in table 5, indicates circuit faults which must be
corrected.
11. Flatness
a. Performance Check
(1) Zero and calibrate the measuring receiver power sensor module.
(2) Connect the power sensor module to the signal generator output.
(3) Set measuring receiver to indicate power level in millivolts and auto
measurement mode.
(4) Press the measuring receiver .100 and MHz keys.
(5) Set signal generator controls for a 100 kHz output and adjust output level for
approximately 1000 mV indication on measuring receiver.
(6) Set up measuring receiver for ratio measurement.
(7) Set audio analyzer to measure 1000 mV ac.
(8) Disconnect the power sensor module from the signal generator output.
(9) Without disturbing signal generator settings, connect signal generator output to
audio analyzer INPUT HIGH using the 50
feedthrough termination to be used with TI
in (12) below.
(10) Press RATIO key on audio analyzer.
(11) Disconnect signal generator output from audio analyzer INPUT HIGH.
(12) Connect TI OUTPUT to audio analyzer INPUT HIGH using precision cable
and the 50 feedthrough termination used in (9) above.
(13) Set FREQUENCY RANGE (MHz) switch to REF .05 and FREQUENCY
VARIABLE control for a FREQUENCY MHz indication of .050 MHz.
(14) Set AMPLITUDE MULTIPLIER switch to X1 and adjust OUTPUT
AMPLITUDE VOLTS P-P control for a 100.00 percent indication on audio analyzer.
(15) Disconnect precision cable from 50
feedthrough termination and connect to
measuring receiver power sensor using necessary adapter.
