TB 9-4931-491-24
b. Adjustments. No adjustments can be made.
11. RF Output Level and Vernier Accuracy
a. Performance Check
(1) Position controls as listed in (a) through (h) below:
(a)
BAND switch to 1.
(b)
SWEEP TIME SEC switch to LINE.
(c)
OUTPUT switch to +10 dBm.
MARKERS WIDTH SIZE switch to WIDE.
(d)
(e)
MODE switch to CW.
(f)
The four paddle switches to their extreme down positions.
(g)
MARKERS MHz 50 Har pushbutton pressed in (all other pushbuttons out).
(h)
Set CENT FREQ to 300 MHz.
NOTE
TI should be stabilized with ac power applied for 15 minutes
before making the following measurements.
(2) Connect sensor module to the power reference output. Zero and calibrate sensor.
(3) D i s c o n n e c t s e n s o r m o d u l e f r o m p o w e r r e f e r e n c e o u t p u t a n d c o n n e c t t o
T I R F OUTPUT.
(4) Configure measuring receiver for RF power measurement.
(5) Using measuring receiver and RF power measurement techniques, measured
power will indicate between +9.5 and +10.5 dBm, if not, perform b below.
(6) Set OUTPUT vernier to 0 dBm.
(7) Measuring receiver will indicate between -0.5 and +0.5 dBm.
(8) Set OUTPUT vernier to -10 dBm.
(9) Measuring receiver will indicate between -9.5 and -10.5 dBm.
b. Adjustments. (See figure 3 for location of adjustments.)
(1) Set OUTPUT to +10 dBm.
(2) Adjust M10H LEVEL MAX until measuring receiver indicates +10 dBm (R).
(3) Adjust OUTPUT vernier to -10 dBm (fully ccw).
(4) Adjust M10H LEVEL MIN until measuring receiver indicates -10 dBm (R).
NOTE
Some interaction exists between LEVEL MIN and LEVEL
MAX controls, so repeat the adjustment until both the +10 and
the -10 dBm readings are obtained.
